### Install and Enable Varnish Service

Source: https://docs.rockylinux.org/books/web_services/052-load-balancer-proxies-varnish

Installs Varnish using dnf, enables it to start on boot, and starts the service.

```bash
dnf install -y varnish
systemctl enable varnish
systemctl start varnish

```

--------------------------------

### Install the community.general Collection

Source: https://docs.rockylinux.org/books/learning_ansible/04-ansible-galaxy

This example shows the command to install the `community.general` collection and the output indicating a successful installation.

```bash
ansible-galaxy collection install community.general
Starting galaxy collection install process
Process install dependency map
Starting collection install process
Downloading https://galaxy.ansible.com/download/community-general-3.3.2.tar.gz to /home/ansible/.ansible/tmp/ansible-local-51384hsuhf3t5/tmpr_c9qrt1/community-general-3.3.2-f4q9u4dg
Installing 'community.general:3.3.2' to '/home/ansible/.ansible/collections/ansible_collections/community/general'
community.general:3.3.2 was installed successfully

```

--------------------------------

### Install with verbose, directory creation, and target options

Source: https://docs.rockylinux.org/books/admin_guide/04-advanced-commands

This example demonstrates creating a directory and copying a file verbosely, showing the process and output.

```bash
$ install -v -D -t ~/samples/ src/sample.txt
install: creating directory '~/samples'
'src/sample.txt' -> '~/samples/sample.txt'
```

--------------------------------

### Query and List RPM Packages with Options

Source: https://docs.rockylinux.org/books/admin_guide/13-softwares

These examples demonstrate querying all installed packages, querying specific packages with detailed information and file lists, and listing the last installed packages.

```bash
sudo rpm -qa
```

```bash
sudo rpm -qilp zork-1.0.3-1.el8.x86_64.rpm tree-1.7.0-15.el8.x86_64.rpm
```

```bash
sudo rpm -qa --last | head
```

```bash
sudo rpm -qa --last kernel
```

--------------------------------

### Enable and Start OliveTin Service

Source: https://docs.rockylinux.org/guides/automation/olivetin

Use this command to enable OliveTin to start on boot and start it immediately. This is the initial setup command.

```bash
sudo systemctl enable --now OliveTin
```

--------------------------------

### Install and Enable Nginx

Source: https://docs.rockylinux.org/books/web_services/022-web-servers-nginx?q=

Installs the Nginx web server and enables it to start automatically on boot.

```bash
sudo dnf install nginx
sudo systemctl enable nginx --now

```

--------------------------------

### Basic Docker Setup

Source: https://docs.rockylinux.org/guides/contribute/localdocs/rockydocs_tool_guide

Sets up the documentation environment using Docker, providing an isolated and consistent build environment without local Python dependency installation.

```bash
./rockydocs.sh --setup --docker
```

--------------------------------

### Kickstart Configuration File Example

Source: https://docs.rockylinux.org/guides/automation/templates-automation-packer-vsphere?q=

An example Kickstart file used by Anaconda for automated installation. It configures repositories, network settings, disk partitioning, and system services.

```bash
# Use CD-ROM installation media
repo --name="AppStream" --baseurl="http://download.rockylinux.org/pub/rocky/8.4/AppStream/x86_64/os/"
cdrom
# Use text install
text
# Don't run the Setup Agent on first boot
firstboot --disabled
eula --agreed
ignoredisk --only-use=sda
# Keyboard layouts
keyboard --vckeymap=us --xlayouts='us'
# System language
lang en_US.UTF-8

# Network information
network --bootproto=static --device=ens192 --gateway=192.168.1.254 --ip=192.168.1.11 --nameserver=192.168.1.254,4.4.4.4 --netmask=255.255.255.0 --onboot=on --ipv6=auto --activate

# Root password
rootpw mysecurepassword

# System services
selinux --permissive
firewall --enabled
services --enabled="NetworkManager,sshd,chronyd"
# System timezone
timezone Europe/Paris --isUtc
# System booloader configuration
bootloader --location=mbr --boot-drive=sda
# Partition clearing information
clearpart --all --initlabel --drives=sda

```

--------------------------------

### Install and Enable pcsd Daemon

Source: https://docs.rockylinux.org/books/web_services/07-high-availability?q=

Install the pcs package and enable the pcsd service to start on boot and immediately.

```bash
sudo dnf install pcs
sudo systemctl enable pcsd --now

```

--------------------------------

### Install and Enable OpenIPMI Service

Source: https://docs.rockylinux.org/guides/hardware/ipmi_management

Install the OpenIPMI package using dnf and then enable and start the ipmi service. This is useful if the service is not installed or not running.

```bash
sudo dnf install OpenIPMI
```

```bash
sudo systemctl enable --now ipmi
```

--------------------------------

### Install and Enable Squid Service

Source: https://docs.rockylinux.org/books/web_services/053-load-balancer-proxies-squid

Install the Squid package using DNF, enable the service to start on boot, and configure the firewall.

```bash
sudo dnf install squid
sudo systemctl enable squid
sudo firewall-cmd --add-port=3128/tcp --permanent
sudo firewall-cmd --reload
```

--------------------------------

### Install Varnish

Source: https://docs.rockylinux.org/books/web_services/052-load-balancer-proxies-varnish

Installs Varnish, enables and starts the service, and configures the firewall to allow access on port 6081.

```bash
sudo dnf install -y varnish
sudo systemctl enable varnishd --now
sudo firewall-cmd --permanent --add-port=6081/tcp --permanent
sudo firewall-cmd --reload
```

--------------------------------

### Start Rsync Daemon Service

Source: https://docs.rockylinux.org/books/learning_rsync/03_rsync_demo02

Install the rsync daemon package if necessary and start the `rsyncd.service`. Verify it is listening on the configured port.

```bash
[root@Rocky ~]# systemctl start rsyncd.service
[root@Rocky ~]# netstat -tulnp
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      691/sshd            
tcp        0      0 192.168.100.4:873       0.0.0.0:*               LISTEN      4607/rsync          
tcp6       0      0 :::22                   :::*                    LISTEN      691/sshd            
udp        0      0 127.0.0.1:323           0.0.0.0:*                           671/chronyd         
udp6       0      0 ::1:323                 :::*                                671/chronyd  

```

--------------------------------

### Enable Quadlet Service for Autostart

Source: https://docs.rockylinux.org/gemstones/containers/podman?q=

Add an [Install] section to the Quadlet file to enable the service to start automatically on system boot or user login.

```ini
[Install]
WantedBy=default.target

```

--------------------------------

### Install Apache (Passive Voice)

Source: https://docs.rockylinux.org/rocky_insights/blogs/active_voice

Example of a passive voice instruction for installing Apache. This phrasing is less direct and uses more words.

```text
For our web platform, Apache must be installed using this command: sudo dnf install httpd
```

--------------------------------

### PAM Configuration Example

Source: https://docs.rockylinux.org/books/security_enhancements/18-about-pam

This is an example of a PAM configuration file, showing the order and type of modules used for authentication, account management, password changes, and session setup.

```pam
auth        required      pam_env.so
auth        sufficient    pam_unix.so try_first_pass nullok
auth        required      pam_deny.so

account     required      pam_unix.so

password    requisite     pam_pwquality.so try_first_pass local_users_only retry=3 authtok_type=
password    requisite     pam_pwhistory.so  remember=3 use_authtok  <<<< Add a new line
password    sufficient    pam_unix.so try_first_pass use_authtok sha512 shadow
password    required      pam_deny.so

session     optional      pam_keyinit.so revoke
session     required      pam_limits.so
-session     optional      pam_systemd.so
session     [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uid
session     required      pam_unix.so
```

--------------------------------

### Install Apache (Passive Voice)

Source: https://docs.rockylinux.org/rocky_insights/blogs/active_voice?q=

Example of a passive voice instruction for installing Apache. This phrasing is less direct and uses more words.

```text
For our web platform, Apache must be installed using this command: `sudo dnf install httpd`
```

--------------------------------

### Configure Boot Command for Installation

Source: https://docs.rockylinux.org/guides/automation/templates-automation-packer-vsphere?q=

Define the command executed during boot to configure network settings and point to the Kickstart file. This example uses static IP configuration.

```json
"boot_command": [
"<up><tab> text ip=192.168.1.11::192.168.1.254:255.255.255.0:template:ens192:none nameserver=192.168.1.254 inst.ks=http://{{ user `HTTP_IP` }}/{{ user `HTTP_PATH` }}<enter><wait><enter>"
],
```

--------------------------------

### Install Apache and PHP

Source: https://docs.rockylinux.org/guides/web/apache-sites-enabled

Installs the Apache web server and PHP package from the Rocky Linux repositories. This is a common starting point for web server setups.

```bash
dnf install httpd php

```

--------------------------------

### Setup Project Directory and Permissions

Source: https://docs.rockylinux.org/books/admin_guide/14-special-authority

This snippet demonstrates creating a directory, setting its owner and group, and assigning initial permissions using `groupadd`, `mkdir`, `chown`, and `chmod`.

```Shell
# The teacher is the root user
Shell > groupadd class1
Shell > mkdir /project
Shell > chown root:class1 /project
Shell > chmod 770 /project
Shell > ls -ld /project/
drwxrwx--- 2 root class1 4096 Jan  12 12:58 /project/
```

--------------------------------

### Install directive example

Source: https://docs.rockylinux.org/books/admin_guide/16-about-sytemd

The `WantedBy` directive in the `[Install]` section specifies the target that should include this unit when enabled. `multi-user.target` is commonly used for services that should start in a normal multi-user system.

```systemd-unit-file
[Install]
WantedBy=multi-user.target
```

--------------------------------

### Initialize Incus Server

Source: https://docs.rockylinux.org/books/incus_server/03-incusinit?q=

Run this command to start the interactive Incus initialization script. It will guide you through the setup process.

```bash
incus admin init

```

--------------------------------

### Serve Static Production-Identical Website

Source: https://docs.rockylinux.org/guides/contribute/localdocs/rockydocs_tool_guide

Start a local web server to preview the documentation in static mode, serving pre-built files exactly as they appear in production. Changes require re-running --deploy.

```bash
./rockydocs.sh --serve --static
```

--------------------------------

### Get Detailed RockyDocs Help

Source: https://docs.rockylinux.org/guides/contribute/localdocs/rockydocs_tool_guide

Access comprehensive help for the rockydocs.sh script and its subcommands like --setup and --serve by using the --help flag.

```bash
./rockydocs.sh --help
./rockydocs.sh --setup --help
./rockydocs.sh --serve --help
```

--------------------------------

### Enable and Secure MariaDB

Source: https://docs.rockylinux.org/guides/cms/mediawiki

Enables the MariaDB service to start on boot and runs the security setup script. It's important to secure your database installation.

```bash
systemctl enable --now mariadb
mysql_secure_installation
```

--------------------------------

### Create and Boot Base Image for Customization

Source: https://docs.rockylinux.org/guides/virtualization/cloud-init/05_image_builders_perspective

Use qemu-img to create a disk image and virt-install to boot a base cloud image for modification. Connect to the console to begin customization.

```bash
qemu-img create -f qcow2 -o size=10G golden-image-template.qcow2

virt-install --name golden-image-builder \
--memory 2048 --vcpus 2 \
--disk path=golden-image-template.qcow2,format=qcow2 \
--cloud-init none --os-variant rockylinux10 --import

virsh console golden-image-builder
```

--------------------------------

### DNF Group Install Output Example

Source: https://docs.rockylinux.org/guides/package_management/dnf_package_manager?q=

This is an example of the output you might see when installing a package group like 'xfce' using DNF.

```bash
sudo dnf group install xfce
Last metadata expiration check: 1:04:31 ago on Mon 05 Feb 2024 08:31:09 PM UTC.
Dependencies resolved.

```

--------------------------------

### Serve Local Documentation with MkDocs

Source: https://docs.rockylinux.org/guides/contribute/localdocs/mkdocs_venv

Start the MkDocs local development server, specifying the configuration file and the Material theme.

```bash
mkdocs serve -f ../docs.rockylinux.org/configs/mkdocs.yml --theme material
```

--------------------------------

### Basic install command syntax

Source: https://docs.rockylinux.org/books/admin_guide/04-advanced-commands?q=

Shows the fundamental syntax for the `install` command, including copying files and creating directories.

```bash
installwsource dest
```

```bash
installw-t directory source [...]
```

```bash
installw-d directory
```

--------------------------------

### Example Flatpak List Output

Source: https://docs.rockylinux.org/desktop/gnome/flatpak?q=

This is an example of the output generated by the 'flatpak list' command, showing installed applications, their IDs, versions, branches, and installation types.

```text
Name                                    Application ID                                  Version   Branch       Installation
OBS Project                             com.obsproject.Studio                           30.1.2    stable       system
FileZilla                               org.filezillaproject.Filezilla                  3.66.1    stable       system
Freedesktop Platform                    org.freedesktop.Platform                        22.08.24  22.08        system
Freedesktop Platform                    org.freedesktop.Platform                        23.08.16  23.08        system
Mesa                                    org.freedesktop.Platform.GL.default             24.0.4    22.08        system
Mesa (Extra)                            org.freedesktop.Platform.GL.default             24.0.4    22.08-extra  system
Mesa                                    org.freedesktop.Platform.GL.default             24.0.5    23.08        system
Mesa (Extra)                            org.freedesktop.Platform.GL.default             24.0.5    23.08-extra  system
Intel                                   org.freedesktop.Platform.VAAPI.Intel                      22.08        system
Intel                                   org.freedesktop.Platform.VAAPI.Intel                      23.08        system
openh264                                org.freedesktop.Platform.openh264               2.1.0     2.2.0        system
openh264                                org.freedesktop.Platform.openh264               2.4.1     2.4.1        system
The GIMP team                           org.gimp.GIMP                                   2.10.36   stable       system
GNOME Application Platform version 46   org.gnome.Platform                                        46           system
Adwaita theme                           org.kde.KStyle.Adwaita                                    6.6          system
KDE Application Platform                org.kde.Platform                                          6.6          system
QGnomePlatform                          org.kde.PlatformTheme.QGnomePlatform                      6.6          system
QAdwaitaDecorations                     org.kde.WaylandDecoration.QAdwaitaDecorations             6.6          system

```

--------------------------------

### Redo a Specific DNF Transaction Example

Source: https://docs.rockylinux.org/guides/package_management/dnf_package_manager?q=

This example demonstrates redoing transaction ID 20, which was an attempt to install 'tar'. The output shows that the package was already installed.

```bash
sudo dnf history redo 20
```

--------------------------------

### View Installation Instructions

Source: https://docs.rockylinux.org/labs/systems_administration_I/lab7-software_management?q=

Use a pager like `less` to read installation or README files that accompany source code. This provides essential information before compiling.

```bash
less INSTALL
```

--------------------------------

### Install LXD Snap Package

Source: https://docs.rockylinux.org/books/lxd_server/01-install?q=

Installs the LXD snap package. This command only installs LXD; setup is a separate step.

```bash
snap install lxd

```

--------------------------------

### Create Disk Image and Boot Base VM

Source: https://docs.rockylinux.org/guides/virtualization/cloud-init/05_image_builders_perspective?q=

Use `qemu-img` to create a disk image and `virt-install` to boot a base cloud image for customization. Connect to the console using `virsh console`.

```bash
# Create a disk image for our new template
qemu-img create -f qcow2 -o size=10G golden-image-template.qcow2

# Boot the base image using virt-install
virt-install --name golden-image-builder \
--memory 2048 --vcpus 2 \
--disk path=golden-image-template.qcow2,format=qcow2 \
--cloud-init none --os-variant rockylinux10 --import

# Connect to the console and log in as the default 'rocky' user
virsh console golden-image-builder

```

--------------------------------

### Install and Enable amsd Service

Source: https://docs.rockylinux.org/guides/hardware/hpe_amsd

Installs the amsd package and enables it to start automatically on boot. It also updates the system before installation.

```bash
dnf -y update && dnf -y install amsd
systemctl enable --now amsd

```

--------------------------------

### Enable and Start Apache

Source: https://docs.rockylinux.org/guides/cms/mediawiki

Enable the Apache web server to start on boot and start it immediately.

```bash
systemctl enable --now httpd

```

--------------------------------

### LXD Initialization Questions and Answers

Source: https://docs.rockylinux.org/books/lxd_server/03-lxdinit?q=

Example answers for the `lxd init` script, covering clustering, storage pools, networking, and remote access.

```bash
Would you like to use LXD clustering? (yes/no) [default=no]:

```

```bash
Do you want to configure a new storage pool? (yes/no) [default=yes]:

```

```bash
Name of the new storage pool [default=default]: storage

```

```bash
Name of the storage backend to use (btrfs, dir, lvm, zfs, ceph) [default=zfs]:

```

```bash
Create a new ZFS pool? (yes/no) [default=yes]: no

```

```bash
Name of the existing ZFS pool or dataset: storage

```

```bash
Would you like to connect to a MAAS server? (yes/no) [default=no]:

```

```bash
Would you like to create a new local network bridge? (yes/no) [default=yes]:

```

```bash
What should the new bridge be called? [default=lxdbr0]: 

```

```bash
What IPv4 address should be used? (CIDR subnet notation, “auto” or “none”) [default=auto]:

```

```bash
What IPv6 address should be used? (CIDR subnet notation, “auto” or “none”) [default=auto]: none

```

```bash
Would you like the LXD server to be available over the network? (yes/no) [default=no]: yes

```

```bash
Address to bind LXD to (not including port) [default=all]:

```

```bash
Port to bind LXD to [default=8443]:

```

```bash
Trust password for new clients:

```

```bash
Again:

```

```bash
Would you like stale cached images to be updated automatically? (yes/no) [default=yes]

```

```bash
Would you like a YAML "lxd init" preseed to be printed? (yes/no) [default=no]:

```

--------------------------------

### Install `iftop`

Source: https://docs.rockylinux.org/gemstones/network/iftop

Installs the EPEL repository and then installs the `iftop` package using `dnf`.

```bash
dnf -y install epel-release
dnf -y install iftop

```

--------------------------------

### Install DNF Environment Group

Source: https://docs.rockylinux.org/labs/systems_administration_I/lab7-software_management?q=

Installs all packages associated with a specified environment group, simplifying the setup of feature sets. The '-y' flag confirms the installation.

```bash
sudo dnf -y group install "Development Tools"

```

--------------------------------

### Serve Documentation with Docker (Live Development)

Source: https://docs.rockylinux.org/guides/contribute/localdocs/rockydocs_tool_guide

Starts the live development server with auto-reloading capabilities using Docker. Changes are reflected instantly in the browser.

```bash
./rockydocs.sh --serve --docker
```

--------------------------------

### Serve Documentation with Docker (Dual Servers)

Source: https://docs.rockylinux.org/guides/contribute/localdocs/rockydocs_tool_guide

Starts dual servers in a containerized environment, offering both full site navigation and live content editing.

```bash
./rockydocs.sh --serve-dual --docker
```

--------------------------------

### Launch VM with ISO

Source: https://docs.rockylinux.org/guides/virtualization/cloud-init/02_first_contact

Launches a virtual machine using virt-install, attaching both the VM disk image and the cloud-init configuration ISO.

```bash
virt-install --name rocky10-iso-boot \
--memory 2048 --vcpus 2 \
--disk path=first-boot-vm.qcow2,format=qcow2 \
--disk path=config.iso,device=cdrom \
--os-variant rockylinux10 \
--import --noautoconsole

```

--------------------------------

### Install and Enable Incus

Source: https://docs.rockylinux.org/books/incus_server/30-appendix_a

Installs the Incus server and tools, and enables the Incus systemd service to start on boot.

```bash
sudo dnf install incus incus-tools
sudo systemctl enable incus

```

--------------------------------

### Enable and Start Nginx

Source: https://docs.rockylinux.org/guides/containers/lxd_web_servers?q=

Enable Nginx to start on boot and start the service immediately using `dnf`.

```bash
dnf enable --now nginx
```

--------------------------------

### Start VMware Tools Services

Source: https://docs.rockylinux.org/guides/virtualization/vmware_tools?q=

Use this command to start the VMware Tools services after installation. Ensure you have root privileges.

```bash
sudo /etc/init.d/vmware-tools start
  Checking acpi hot plug                                              done
  Starting VMware Tools services in the virtual machine:
    Switching to guest configuration:                                   done
    Guest filesystem driver:                                            done
    Mounting HGFS shares:                                               done
    Blocking file system:                                               done
    Guest operating system daemon:                                      done
    VGAuthService:   
```

--------------------------------

### PAM Configuration Line Example

Source: https://docs.rockylinux.org/guides/containers/rootless_podman_advanced

This is an example of a correctly configured pam_systemd.so line in PAM configuration, using the '-session' form.

```text
-session   optional pam_systemd.so
```

--------------------------------

### Install Podman and Git

Source: https://docs.rockylinux.org/guides/contribute/localdocs/rockydocs_webdev_v2?q=

Installs Podman, docker-compose compatibility for Podman, and Git. Enables and starts the Podman socket service.

```bash
sudo dnf -y install podman podman-docker git

sudo systemctl enable --now  podman.socket

```

--------------------------------

### Install vsftpd and openssl

Source: https://docs.rockylinux.org/guides/file_sharing/secure_ftp_server_vsftpd

Install the vsftpd package and openssl for secure FTP server setup. This is a prerequisite for configuring the server.

```bash
dnf install vsftpd openssl

```

--------------------------------

### Install `semanage` Command

Source: https://docs.rockylinux.org/guides/security/learning_selinux

Install the `policycoreutils-python-utils` package to get the `semanage` command. This command is essential for managing SELinux rules.

```bash
sudo dnf install policycoreutils-python-utils

```

--------------------------------

### Install and Configure Apache

Source: https://docs.rockylinux.org/books/web_services/052-load-balancer-proxies-varnish

Installs Apache HTTP Server, enables it, configures the firewall, and creates a basic index.html file.

```bash
sudo dnf install -y httpd mod_ssl
sudo systemctl enable httpd  --now
sudo firewall-cmd --permanent --add-service=http
sudo firewall-cmd --permanent --add-service=https
sudo firewall-cmd --reload
echo "<html><body>Node $(hostname -f)</body></html>" | sudo tee "/var/www/html/index.html"
```

--------------------------------

### Initialize and Enable Services

Source: https://docs.rockylinux.org/teams/testing/documentation/dev_guides/openqa_manual_install

Initializes the PostgreSQL database and enables/starts essential openQA services, HTTPD, and libvirtd. Also configures the firewall.

```bash
sudo dnf install postgresql-server
sudo postgresql-setup --initdb

# enable and start services
sudo systemctl enable postgresql --now
sudo systemctl enable httpd --now
sudo systemctl enable openqa-gru --now
sudo systemctl enable openqa-scheduler --now
sudo systemctl enable openqa-websockets --now
sudo systemctl enable openqa-webui --now
sudo systemctl enable fm-consumer@fedora_openqa_scheduler --now
sudo systemctl enable libvirtd --now
sudo setsebool -P httpd_can_network_connect 1
sudo firewall-cmd --add-service=http --permanent
sudo firewall-cmd --reload
sudo systemctl restart httpd
```

--------------------------------

### Install and Enable Redis for Fact Caching

Source: https://docs.rockylinux.org/books/learning_ansible/08-management-server-optimizations

Install the Redis package, start and enable the Redis service, and install the Python Redis client. This is a prerequisite for using Redis as a fact cache.

```bash
sudo yum install redis
sudo systemctl start redis
sudo systemctl enable redis
sudo pip3 install redis
```

--------------------------------

### Start NFS Server Daemon

Source: https://docs.rockylinux.org/labs/networking/lab5-nfs

Starts the nfs-server daemon. This command is used to activate the NFS server services after installation or if they are stopped.

```bash
systemctl start nfs-server

```

--------------------------------

### Enable and Start Apache Service

Source: https://docs.rockylinux.org/guides/web/php?q=

Enable the Apache service to start on boot and start it immediately using 'systemctl'. Check its status to ensure it is running correctly.

```bash
sudo systemctl enable --now httpd
sudo systemctl status httpd

```

--------------------------------

### Download and run the micro installer

Source: https://docs.rockylinux.org/guides/editors/micro?q=

Fetches the micro installer script from the official website and executes it. This command installs micro in the current directory.

```bash
curl https://getmic.ro | bash

```

--------------------------------

### Serve Documentation with Docker (Static Mode)

Source: https://docs.rockylinux.org/guides/contribute/localdocs/rockydocs_tool_guide

Starts a production-identical static server using Docker. This mode is suitable for final verification.

```bash
./rockydocs.sh --serve --docker --static
```

--------------------------------

### Start OpenVPN Client

Source: https://docs.rockylinux.org/guides/security/openvpn

Initiates the OpenVPN connection using the specified client configuration file.

```bash
sudo openvpn /etc/openvpn/client.conf

```

--------------------------------

### Lsyncd Log Output Example

Source: https://docs.rockylinux.org/guides/contribute/localdocs/mkdocs_lsyncd?q=

This is an example of the expected output in the lsyncd log file if the service starts correctly and begins synchronization.

```log
Fri Feb 25 08:10:16 2022 Normal: --- Startup, daemonizing ---
Fri Feb 25 08:10:16 2022 Normal: recursive startup rsync: /home/youruser/documentation/ -> root@10.56.233.189:/home/youruser/documentation/
Fri Feb 25 08:10:41 2022 Normal: Startup of "/home/youruser/documentation/" finished: 0
Fri Feb 25 08:15:14 2022 Normal: Calling rsync with filter-list of new/modified files/dirs

```

--------------------------------

### Start a service with systemctl

Source: https://docs.rockylinux.org/labs/systems_administration_II/lab3-bootup_and_startup?q=

Use `systemctl start` to initiate a service. The command should complete without output if successful.

```bash
[root@localhost ~]# systemctl start crond.service

```

--------------------------------

### Enable and Start libvirtd Service

Source: https://docs.rockylinux.org/guides/virtualization/libvirt-rocky?q=

Enable the libvirtd service to start on boot and start it immediately.

```bash
sudo systemctl enable --now libvirtd

```

--------------------------------

### Set up MkDocs Docs Directory

Source: https://docs.rockylinux.org/guides/contribute/localdocs/mkdocs_lsyncd?q=

Create the necessary 'docs' directory and symlink the documentation source into it for MkDocs to use.

```bash
mkdir docs
cd docs
ln -s ../../documentation/docs

```

--------------------------------

### Install EPEL Repository

Source: https://docs.rockylinux.org/guides/containers/podman-nextcloud?q=

Install the Extra Packages for Enterprise Linux (EPEL) repository, which provides additional packages needed for this guide.

```bash
dnf -y install epel-release 

```

--------------------------------

### Install Squid Package

Source: https://docs.rockylinux.org/books/web_services/053-load-balancer-proxies-squid

Use this command to install the Squid proxy server package on your system. Ensure the service is not started until the cache is initialized.

```bash
sudo dnf install squid

```

--------------------------------

### Enable and Start Service Immediately

Source: https://docs.rockylinux.org/labs/systems_administration_II/lab3-bootup_and_startup

Use `systemctl --now enable` to both enable a service for automatic startup and start it running immediately. This is a convenient way to ensure a service is active and will persist across reboots.

```bash
[root@localhost ~]# systemctl --now enable crond.service


```

--------------------------------

### Create Site Configuration Directories

Source: https://docs.rockylinux.org/guides/web/nginx-multisite

Create the `sites-available` and `sites-enabled` directories to manage individual website configurations.

```bash
mkdir sites-available
mkdir sites-enabled
```

--------------------------------

### Example Dependency Resolution

Source: https://docs.rockylinux.org/guides/backup/rsnapshot_backup

An example output showing dependency resolution during the rsnapshot installation process, including package versions and transaction summary.

```text
dnf install rsnapshot rsync
Last metadata expiration check: 2:03:40 ago on Fri 19 Sep 2025 03:54:16 PM UTC.
Package rsync-3.4.1-2.el10.x86_64 is already installed.
Dependencies resolved.
==============================================================================================================================
Package                         Architecture            Version                             Repository                  Size
==============================================================================================================================
Installing:
rsnapshot                       noarch                  1.5.1-1.el10_0                      epel                       112 k
Installing dependencies:
perl-DirHandle                  noarch                  1.05-512.2.el10_0                   appstream                   12 k

Transaction Summary
==============================================================================================================================
Install  2 Packages

Total download size: 124 k
Installed size: 388 k
Is this ok [y/N]: y


```

--------------------------------

### Example Dependency Resolution Prompt

Source: https://docs.rockylinux.org/guides/backup/rsnapshot_backup?q=

Illustrates the DNF dependency resolution process when installing rsnapshot, showing packages to be installed and prompting for confirmation.

```bash
dnf install rsnapshot rsync
Last metadata expiration check: 2:03:40 ago on Fri 19 Sep 2025 03:54:16 PM UTC.
Package rsync-3.4.1-2.el10.x86_64 is already installed.
Dependencies resolved.
==============================================================================================================================
Package                         Architecture            Version                             Repository                  Size
==============================================================================================================================
Installing:
rsnapshot                       noarch                  1.5.1-1.el10_0                      epel                       112 k
Installing dependencies:
perl-DirHandle                  noarch                  1.05-512.2.el10_0                   appstream                   12 k

Transaction Summary
==============================================================================================================================
Install  2 Packages

Total download size: 124 k
Installed size: 388 k
Is this ok [y/N]: y

```

--------------------------------

### Install markdown-preview.nvim Plugin

Source: https://docs.rockylinux.org/books/nvchad/plugins/md_preview?q=

Add this code block to your plugins/init.lua to install the markdown-preview.nvim plugin. It's configured to be lazy-loaded and includes a build step for setup.

```lua
{
    "iamcco/markdown-preview.nvim",
    cmd = {"MarkdownPreview", "MarkdownPreviewStop"},
    lazy = false,
    build = function() vim.fn["mkdp#util#install"]() end,
    init = function()
        vim.g.mkdp_theme = 'dark'
    end
},

```

--------------------------------

### Enable and Start Apache Service

Source: https://docs.rockylinux.org/books/web_services/03-application-servers?q=

Enable the Apache service to start on boot and start it immediately. Also, check its status.

```bash
sudo systemctl enable --now httpd
sudo systemctl status httpd
```

--------------------------------

### Build ISO with Kickstart File

Source: https://docs.rockylinux.org/guides/isos/iso_creation?q=

Use the `mkksiso` command to create a new ISO image with an integrated kickstart file. Replace placeholders with the actual paths to your kickstart file, original ISO, and desired new ISO.

```bash
mkksiso --ks <PATH_TO_KICKSTART_FILE> <PATH_TO_ISO> <PATH_TO_NEW_ISO>

```

--------------------------------

### Install Nginx Package

Source: https://docs.rockylinux.org/guides/web/nginx-mainline

Installs the Nginx web server package from the Rocky Linux repositories. This is the standard way to get Nginx on Rocky Linux.

```bash
sudo dnf install nginx

```

--------------------------------

### Create Index File for Site 1

Source: https://docs.rockylinux.org/guides/web/nginx-multisite

Open an index.html file in the 'html' directory of the first test site using the nano text editor. This file will contain the basic HTML content for the first website.

```bash
nano test.server.site1/html/index.html

```

--------------------------------

### Install SELinux Management Tools

Source: https://docs.rockylinux.org/guides/security/learning_selinux?q=

Install the `policycoreutils-python-utils` package to get the `semanage` command and other SELinux management utilities. This command requires superuser privileges.

```bash
sudo dnf install policycoreutils-python-utils
```

--------------------------------

### Install mailx and Postfix

Source: https://docs.rockylinux.org/books/learning_bash/appendix/02-variables-logs?q=

Installs the mailx utility and Postfix mail transfer agent, then enables and starts the Postfix service. These are required for sending emails from the server.

```bash
dnf install mailx postfix
systemctl enable --now postfix
```

--------------------------------

### Setup Tripwire Keyfiles

Source: https://docs.rockylinux.org/labs/security/lab3-auditing_the_system?q=

Execute the Tripwire setup utility to generate and protect configuration and policy files with passphrases. You will be prompted for both a site keyfile passphrase and a local keyfile passphrase.

```bash
[root@localhost tripwire]# tripwire-setup-keyfiles
.....
Enter the site keyfile passphrase:
Verify the site keyfile passphrase:
......
Generating key (this may take several minutes)...Key generation complete.

Enter the local keyfile passphrase:
Verify the local keyfile passphrase:
....
Generating key (this may take several minutes)...Key generation complete.

```

```bash
----------------------------------------------
Signing configuration file...
Please enter your site passphrase: ********

----------------------------------------------
Signing policy file...
Please enter your site passphrase: ********
......

Wrote policy file: /etc/tripwire/tw.pol

```

--------------------------------

### Ansistrano Custom Before Setup Tasks

Source: https://docs.rockylinux.org/books/learning_ansible/05-deployments

Define custom tasks to be executed before the Ansistrano setup phase. This example sends an email notification using the `mail` module.

```yaml
---
- name: Send a mail
  mail:
    subject: Starting deployment on {{ ansible_hostname }}.
  delegate_to: localhost

```

--------------------------------

### Configure and Mount Additional Storage

Source: https://docs.rockylinux.org/guides/automation/kickstart-rocky

Example of configuring and mounting additional storage during the post-installation phase.

```kickstart
%post
# Configure and mount additional storage
%end
```

--------------------------------

### Install and Launch nmtui

Source: https://docs.rockylinux.org/gemstones/network/nmtui?q=

Install the NetworkManager and nmtui packages, then launch the nmtui interface to configure network settings.

```shell
shell > dnf -y install NetworkManager NetworkManager-tui
shell > nmtui
```

--------------------------------

### PHP-FPM Dynamic Process Management Example

Source: https://docs.rockylinux.org/books/web_services/03-application-servers?q=

Example configuration for dynamic process management in PHP-FPM, specifying maximum children, start servers, and spare server limits.

```ini
pm = dynamic
pm.max_children = 5
pm.start_servers = 2
pm.min_spare_servers = 1
pm.max_spare_servers = 3

```

--------------------------------

### Example Hosts File Configuration

Source: https://docs.rockylinux.org/guides/cms/dokuwiki_server

Example configuration for the /etc/hosts file, mapping a private IP to example.com.

```text
127.0.0.1 localhost
127.0.1.1 myworkstation-home
10.56.233.179 example.com     example

# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

```

--------------------------------

### Uninstall Packages with RPM

Source: https://docs.rockylinux.org/labs/systems_administration_I/lab7-software_management

Before installing with DNF, ensure the target package and its dependencies are uninstalled using the `rpm -e` command. This is a prerequisite step for the DNF installation example.

```bash
sudo rpm -e wget libmetalink
```

--------------------------------

### Packer Provisioners Section (Shell)

Source: https://docs.rockylinux.org/guides/automation/templates-automation-packer-vsphere?q=

Configure provisioners to execute scripts after the OS installation. This example uses a shell provisioner to run a script for cleaning up the VM and installing additional packages.

```json
"provisioners": [
  {
    "type": "shell",
    "expect_disconnect": true,
    "execute_command": "bash '{{.Path}}'",
    "script": "{{template_dir}}/scripts/requirements.sh"
  }
],


```

--------------------------------

### Example /etc/fstab Entry

Source: https://docs.rockylinux.org/books/admin_guide/07-file-systems

This is an example of how file systems are configured for automatic mounting at boot time in the /etc/fstab file. Each line defines a file system, its mount point, type, options, and dump/check order.

```shell
/dev/mapper/VolGroup-lv_root   /         ext4    defaults        1   1
UUID=46….92                    /boot     ext4    defaults        1   2
/dev/mapper/VolGroup-lv_swap   swap      swap    defaults        0   0
tmpfs                          /dev/shm  tmpfs   defaults        0   0
devpts                         /dev/pts  devpts  gid=5,mode=620  0   0
sysfs                          /sys      sysfs   defaults        0   0
proc                           /proc     proc    defaults        0   0
```

--------------------------------

### Update and Install MySQL 8.4 LTS Community Server

Source: https://docs.rockylinux.org/books/web_services/042-database-servers-mysql

Updates the system and installs MySQL 8.4 LTS Community Server after adding its repository. Includes example command output.

```bash
$ dnf update
Error: This command has to be run with superuser privileges (under the root user on most systems).
[antoine@localhost ~]$ sudo dnf update
MySQL 8.4 LTS Community Server                                                                               377 kB/s | 226 kB     00:00
MySQL Connectors Community                                                                                   110 kB/s |  53 kB     00:00
MySQL Tools 8.4 LTS Community                                                                                170 kB/s |  97 kB     00:00
Dependencies resolved.
============================================================================================================================================= Package                                   Architecture      Version                                Repository   
                       Size
=============================================================================================================================================Installing:
 mysql-community-client                    x86_64            8.4.0-1.el9                            mysql-8.4-lts-community            3.1 M
     replacing  mysql.x86_64 8.0.36-1.el9_3
 mysql-community-server                    x86_64            8.4.0-1.el9                            mysql-8.4-lts-community             50 M
     replacing  mariadb-connector-c-config.noarch 3.2.6-1.el9_0
     replacing  mysql-server.x86_64 8.0.36-1.el9_3
Installing dependencies:
  ...

Transaction Summary
=============================================================================================================================================Install  7 Packages

Total download size: 59 M
Is this ok [y/N]: y
Downloading Packages:
(1/7): mysql-community-client-plugins-8.4.0-1.el9.x86_64.rpm                                                 3.4 MB/s | 1.4 MB     00:00
(2/7): mysql-community-common-8.4.0-1.el9.x86_64.rpm                                                         1.3 MB/s | 576 kB     00:00
(3/7): mysql-community-icu-data-files-8.4.0-1.el9.x86_64.rpm                                                  30 MB/s | 2.3 MB     00:00
(4/7): mysql-community-client-8.4.0-1.el9.x86_64.rpm                                                         5.8 MB/s | 3.1 MB     00:00
(5/7): mysql-community-libs-8.4.0-1.el9.x86_64.rpm                                                           6.8 MB/s | 1.5 MB     00:00
(6/7): net-tools-2.0-0.62.20160912git.el9.x86_64.rpm                                                         1.1 MB/s | 292 kB     00:00
(7/7): mysql-community-server-8.4.0-1.el9.x86_64.rpm                                                          48 MB/s |  50 MB     00:01
---------------------------------------------------------------------------------------------------------------------------------------------Total                                                                                                         30 
MB/s |  59 MB     00:01
MySQL 8.4 LTS Community Server                                                                               3.0 MB/s | 3.1 kB     00:00
Importing GPG key 0xA8D3785C:
 Userid     : "MySQL Release Engineering <mysql-build@oss.oracle.com>"
 Fingerprint: BCA4 3417 C3B4 85DD 128E C6D4 B7B3 B788 A8D3 785C
 From       : /etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2023
Is this ok [y/N]: y
Key imported successfully
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Preparing        :
  ...
Installed:
  mysql-community-server-8.4.0-1.el9.x86_64
  ...

Complete!
```

--------------------------------

### Start MkDocs Serve Command

Source: https://docs.rockylinux.org/guides/contribute/localdocs/mkdocs_lsyncd?q=

Use this command to start the MkDocs development server. It binds to all network interfaces, making the documentation accessible from other devices on your network.

```bash
mkdocs serve -a 0.0.0.0:8000

```

--------------------------------

### Verify Environment Setup

Source: https://docs.rockylinux.org/books/learning_rsync/07_rsync_unison_use

Commands to verify that inotifywait is installed and SSH access is configured between machines.

```bash
[root@Rocky ~]# inotifywa
inotifywait inotifywatch
[root@Rocky ~]# ssh -p 22 testrsync@192.168.100.5
Last login: Thu Nov 4 13:13:42 2021 from 192.168.100.4
[testrsync@fedora ~]$

```

```bash
[root@fedora ~]# inotifywa
inotifywait inotifywatch
[root@fedora ~]# ssh -p 22 testrsync@192.168.100.4
Last login: Wed Nov 3 22:07:18 2021 from 192.168.100.5
[testrsync@Rocky ~]$

```

--------------------------------

### Run the mkdocs server

Source: https://docs.rockylinux.org/guides/contribute/localdocs/local_docs?q=

Start the local mkdocs development server to view the documentation.

```bash
mkdocs serve
```

--------------------------------

### Query information for 'bash' package

Source: https://docs.rockylinux.org/labs/systems_administration_I/lab7-software_management?q=

A simple query to get all information about the installed 'bash' package.

```bash
rpm -qi bash
```