Red Hat Enterprise Linux 8

https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8
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### Install and start QEMU Guest Agent on guest

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/configuring_and_managing_virtualization/enabling-qemu-guest-agent-features-on-your-virtual-machines_configuring-and-managing-virtualization

Install the agent package and start the service within the Linux guest operating system.

```bash
# **yum install qemu-guest-agent**
```

```bash
# **systemctl start qemu-guest-agent**
```

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

### Sample OpenSCAP Add-on Definition Using SCAP Security Guide

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/automatically_installing_rhel/kickstart-commands-and-options-reference_rhel-installer

Example configuration using the built-in scap-security-guide package from the installation media.

```kickstart
%addon org_fedora_oscap
content-type = scap-security-guide
profile = xccdf_org.ssgproject.content_profile_pci-dss
%end
```

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

### Configure Installation Source URLs

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html-single/automatically_installing_rhel/index

Examples for defining HTTP and FTP installation sources.

```text
url --url=http://_server_/_path_
```

```text
url --url=ftp://_username_:_password_@_server_/_path_
```

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

### Example Kickstart Configuration

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/composing_a_customized_rhel_system_image/creating-system-images-with-composer-command-line-interface_composing-a-customized-rhel-system-image

A standard Kickstart configuration example for automated RHEL installations.

```kickstart
liveimg --url file:///run/install/<_repo_>/liveimg.tar.gz
lang en_US.UTF-8
keyboard us
timezone UTC
zerombr
clearpart --all --initlabel
text
autopart --type=plain --fstype=xfs --nohome
reboot --eject
network --device=link --bootproto=dhcp --onboot=on --activate
```

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

### Example %setup macro output

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/packaging_and_distributing_software/advanced-topics

Shows the initial execution output of the %setup macro during the %prep phase.

```text
Executing(%prep): /bin/sh -e /var/tmp/rpm-tmp.DhddsG
```

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

### Starting the HTTP Service

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/composing_installing_and_managing_rhel_for_edge_images/building-and-provisioning-simplified-installer-images_composing-installing-managing-rhel-for-edge-images

Start the httpd service to begin serving the installer files.

```bash
# **systemctl start httpd.service**
```

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

### Start installation with an external CA

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/installing_identity_management/adding-the-idm-ca-service-to-an-idm-server-in-a-deployment-without-a-ca_installing-identity-management

Initiate the CA installation process specifying an external root CA.

```bash
[root@idmserver ~] **ipa-ca-install --external-ca**
```

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

### Start a boot ISO compose

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/composing_a_customized_rhel_system_image/creating-a-boot-iso-installer-image-with-image-builder_composing-a-customized-rhel-system-image

Initiates the creation of an installer ISO image using a specified blueprint.

```bash
# composer-cli compose start _BLUEPRINT-NAME_ _image-installer_
```

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

### Start RHEL for Edge Simplified Installer image build

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/composing_installing_and_managing_rhel_for_edge_images/building-and-provisioning-simplified-installer-images_composing-installing-managing-rhel-for-edge-images

Initiates the creation of a bootable ISO image using a specified blueprint and OSTree repository URL.

```bash
# composer-cli compose start-ostree \
_blueprint-name_ \
edge-simplified-installer \
--ref rhel/8/x86_64/edge \
--url _URL-OSTree-repository_ \
```

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

### Define GRUB configuration file

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/automatically_installing_rhel/preparing-for-a-network-install_rhel-installer

Example configuration for the GRUB bootloader to initiate the RHEL installer.

```text
set default=0
set timeout=5

echo -e "\nWelcome to the Red Hat Enterprise Linux 8 installer!\n\n"

menuentry 'Red Hat Enterprise Linux 8' {
  linux grub2-ppc64/vmlinuz ro ip=dhcp inst.repo=http://_192.168.124.2_/RHEL-8/x86_64/iso-contents-root/
  initrd grub2-ppc64/initrd.img
}
```

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

### Execute Playbook with Vault Credentials

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html-single/using_ansible_to_install_and_manage_identity_management/index

Example of a playbook using the encrypted password and the command to execute it with the vault password file.

```yaml
---
- name: Playbook to handle users
  hosts: ipaserver

  **vars_files:**
  **- /home/_user_name_/MyPlaybooks/secret.yml**

  tasks:
  - name: Delete user robot
    ipauser:
      **ipaadmin_password: "{{ ipaadmin_password }}"**
      name: robot
      state: absent
```

```bash
**ansible-playbook -i inventory --vault-password-file=password_file del-user.yml**
```

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

### Identify IdM replica installation failure logs

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/installing_identity_management/troubleshooting-idm-replica-installation_installing-identity-management

Example output showing an 'Invalid credentials' error during the replication setup phase of an IdM installation.

```text
[27/40]: setting up initial replication
Starting replication, please wait until this has completed.
Update in progress, 15 seconds elapsed
[ldap://server.example.com:389] reports: **Update failed! Status: [49 - LDAP error: Invalid credentials]**

[error] RuntimeError: Failed to start replication
Your system may be partly configured.
Run /usr/sbin/ipa-server-install --uninstall to clean up.

ipa.ipapython.install.cli.install_tool(CompatServerReplicaInstall): ERROR    Failed to start replication
ipa.ipapython.install.cli.install_tool(CompatServerReplicaInstall): ERROR    The ipa-replica-install command failed. See /var/log/ipareplica-install.log for more information
```

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

### Configure IdM Server DNS Location Playbook

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html-single/using_ansible_to_install_and_manage_identity_management/index

Example YAML configuration for the ipaserver task to remove the DNS location from a specific server.

```yaml
---
- name: Server no location example
  hosts: ipaserver

  vars_files:
  - /home/user_name/MyPlaybooks/secret.yml
  tasks:
  - name: Ensure server server123.idm.example.com is present with no location
    ipaserver:
      ipaadmin_password: "{{ ipaadmin_password }}"
      name: server123.idm.example.com
      location: “"
```

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

### Configure service presence without host check

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html-single/using_ansible_to_install_and_manage_identity_management/index

Example playbook task to ensure an HTTP service is present in IdM, skipping the host check.

```yaml
---
- name: Playbook to manage IPA service.
  hosts: ipaserver
  gather_facts: false

  vars_files:
  - /home/user_name/MyPlaybooks/secret.yml
  tasks:
  # Ensure service is present
  - ipaservice:
      ipaadmin_password: "{{ ipaadmin_password }}"
      name: HTTP/www2.example.com
      skip_host_check: true
```

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

### Example .buildstamp file

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/customizing_anaconda/completing-post-customization-tasks_customizing-anaconda

A sample configuration file defining system version and product parameters.

```ini
[Main]
Product=Red Hat Enterprise Linux
Version=8.4
BugURL=https://bugzilla.redhat.com/
IsFinal=True
UUID=202007011344.x86_64
[Compose]
Lorax=28.14.49-1
```

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

### Install and Enable autofs

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html-single/managing_file_systems/index

Commands to install the autofs package and start the service.

```bash
# **yum install autofs**
```

```bash
# **systemctl enable --now autofs**
```

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

### Enable SSH during installation

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html-single/automatically_installing_rhel/index

Use this option to start the sshd service during the installation process.

```text
inst.sshd
```

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

### Install and enable TuneD service

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/monitoring_and_managing_system_status_and_performance/getting-started-with-tuned_monitoring-and-managing-system-status-and-performance

Commands to install the package and start the service on the system.

```bash
# yum install tuned
```

```bash
# systemctl enable --now tuned
```

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

### Install and enable cloud-init

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/deploying_rhel_8_on_google_cloud_platform/assembly_deploying-a-rhel-image-as-a-compute-engine-instance-on-google-cloud-platform

Install the cloud-init package and enable its service to ensure the VM is properly configured for cloud environments.

```bash
# **yum install cloud-init**
# **systemctl enable --now cloud-init.service**
```

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

### Run ipa-client-install with options

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/installing_identity_management/assembly_installing-an-idm-client_installing-identity-management

Execute the installation utility with flags to enable home directory creation and DNS updates.

```bash
# **ipa-client-install --mkhomedir --enable-dns-updates**
```

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

### List Example Playbooks

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/installing_identity_management/installing-an-Identity-Management-server-using-an-Ansible-playbook_installing-identity-management

List the available example playbooks for installing and uninstalling IdM components.

```bash
[root@server]# **ls -1 /usr/share/doc/ansible-freeipa/playbooks/**
install-client.yml
install-cluster.yml
install-replica.yml
install-server.yml
uninstall-client.yml
uninstall-cluster.yml
uninstall-replica.yml
uninstall-server.yml
```

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

### Create a VM with Kickstart installation

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/configuring_and_managing_virtualization/getting-started-with-virtualization-in-rhel-8_configuring-and-managing-virtualization

Creates a VM named demo-guest4 using a remote installation tree and an automated kickstart configuration file.

```bash
# **virt-install \
    **--graphics vnc \
    **--name demo-guest4 --memory 2048 --vcpus 2 --disk size=160 \
    **--osinfo rhel8.0 --location http://example.com/OS-install \
    **--initrd-inject /home/username/ks.cfg --extra-args="inst.ks=file:/ks.cfg console=tty0 console=ttyS0,115200n8"**
```

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

### Sample generic.ins file

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/automatically_installing_rhel/preparing-a-rhel-installation-on-64-bit-ibm-z_rhel-installer

Maps installation file locations to specific memory addresses for the boot process.

```text
images/kernel.img 0x00000000
images/initrd.img 0x02000000
images/genericdvd.prm 0x00010480
images/initrd.addrsize 0x00010408
```

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

### Create Hello World PHP Project

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html-single/configuring_basic_system_settings/index

Steps to create a directory and a PHP file for a Hello World demonstration.

```bash
# **mkdir hello**
```

```html
# <!DOCTYPE html>
<html>
<head>
<title>Hello, World! Page</title>
</head>
<body>
<?php
    echo 'Hello, World!';
?>
</body>
</html>
```

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

### Install and Enable Pacemaker Services

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/configuring_and_managing_high_availability_clusters/assembly_getting-started-with-pacemaker-configuring-and-managing-high-availability-clusters

Install the necessary High Availability packages and start the pcsd service.

```bash
# **yum install pcs pacemaker fence-agents-all**
...
# **systemctl start pcsd.service**
# **systemctl enable pcsd.service**
```

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

### GDB output example

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/developing_c_and_cpp_applications_in_rhel_8/debugging-applications_developing-applications

Example output from GDB indicating missing debuginfo and suggesting an installation command.

```text
Reading symbols from /bin/ls...Reading symbols from .gnu_debugdata for /usr/bin/ls...(no debugging symbols found)...done.
(no debugging symbols found)...done.
Missing separate debuginfos, use: dnf _debuginfo-install coreutils-8.30-6.el8.x86_64_
(gdb)
```

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

### Configure installation from a local hard drive

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/automatically_installing_rhel/kickstart-commands-and-options-reference_rhel-installer

Specifies a local partition and directory containing the installation tree or ISO image.

```kickstart
harddrive _OPTIONS_
```

```kickstart
harddrive --partition=hdb2 --dir=/tmp/install-tree
```

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

### Configure liveimg installation

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/automatically_installing_rhel/kickstart-commands-and-options-reference_rhel-installer

Defines the syntax and an example for using the liveimg command to install from a disk image.

```text
liveimg --url=_SOURCE_ [_OPTIONS_]
```

```text
liveimg --url=file:///images/install/squashfs.img --checksum=03825f567f17705100de3308a20354b4d81ac9d8bed4bb4692b2381045e56197 --noverifyssl
```

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

### Create a VM by importing an existing disk image

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/configuring_and_managing_virtualization/getting-started-with-virtualization-in-rhel-8_configuring-and-managing-virtualization

Creates a virtual machine named demo-guest3 by attaching an existing qcow2 disk image.

```bash
# virt-install \
    --graphics vnc \
    --name demo-guest3 --memory 2048 --vcpus 2 \
    --os-info rhel8.0 --import \
    --disk /home/username/backup/disk.qcow2
```

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

### Define Installation Source via URL

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/automatically_installing_rhel/kickstart-commands-and-options-reference_rhel-installer

Specifies a remote server for installation files using HTTP, HTTPS, or FTP protocols.

```kickstart
url --url=_FROM_ [_OPTIONS_]
```

```kickstart
url --url=http://_server_/_path_
```

```kickstart
url --url=ftp://_username_:_password_@_server_/_path_
```

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

### Install and configure targetcli

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html-single/managing_storage_devices/index

Installs the targetcli tool, starts the target service, and configures firewall rules for iSCSI.

```bash
# **yum install targetcli**
```

```bash
# **systemctl start target**
```

```bash
# **systemctl enable target**
```

```bash
# **firewall-cmd --permanent --add-port=3260/tcp**
Success
```

```bash
# **firewall-cmd --reload**
Success
```

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

### Configure logging for a %pre-install script

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/automatically_installing_rhel/kickstart-script-file-format-reference_rhel-installer

Directs the output of the pre-installation script to a specific log file path.

```kickstart
%pre-install --log=/mnt/sysroot/root/ks-pre.log
```

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

### Configure Initial Setup Application

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/automatically_installing_rhel/kickstart-commands-and-options-reference_rhel-installer

Determines if the Initial Setup application runs upon the first system boot.

```kickstart
firstboot _OPTIONS_
```

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

### Install and Enable Stratis Service

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html-single/managing_file_systems/index

Install the required packages and start the stratisd daemon to enable Stratis functionality.

```bash
# **dnf install stratisd stratis-cli**
```

```bash
# **systemctl enable --now stratisd**
```

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

### Install Kernel Debuginfo Package

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/monitoring_and_managing_system_status_and_performance/tuning-the-network-performance_monitoring-and-managing-system-status-and-performance

Command to install the debuginfo package containing kernel source code examples.

```bash
# yum install kernel-debuginfo-common-x86_64
```

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

### Display ipa-server-install help

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/installing_identity_management/installing-an-ipa-server-with-integrated-dns_installing-identity-management

Retrieves the complete list of available options for the installation script.

```bash
ipa-server-install --help
```

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

### Start container instance

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/building_running_and_managing_containers/selecting-a-container-runtime_building-running-and-managing-containers

Launch the specified container instance.

```bash
# <runtime> start myubi
```

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

### Configure NFS installation source

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/automatically_installing_rhel/kickstart-commands-and-options-reference_rhel-installer

Defines the syntax and an example for using the nfs command to specify an installation source.

```text
nfs _OPTIONS_
```

```text
nfs --server=nfsserver.example.com --dir=/tmp/install-tree
```

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

### Install and Configure Apache for PHP

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/configuring_basic_system_settings/installing-and-using-dynamic-programming-languages_configuring-basic-system-settings

Commands to install the Apache HTTP Server and start the necessary services for PHP execution.

```bash
# yum module install httpd:2.4
```

```bash
# systemctl start httpd
```

```bash
# systemctl restart httpd
```

```bash
# systemctl start php-fpm
```

```bash
# systemctl enable php-fpm httpd
```

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

### Start virtualization services

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/configuring_and_managing_virtualization/getting-started-with-virtualization-in-rhel-8-on-ibm-z_configuring-and-managing-virtualization

Initialize the necessary virtualization sockets and services.

```bash
# **for drv in qemu network nodedev nwfilter secret storage interface; do systemctl start virt${drv}d{,-ro,-admin}.socket; done**
```

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

### Install and Configure Pacemaker Remote Services

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html-single/configuring_and_managing_high_availability_clusters

Commands to install required packages, start services, and open firewall ports on the virtual machine.

```bash
# **yum install pacemaker-remote resource-agents pcs**
# **systemctl start pcsd.service**
# **systemctl enable pcsd.service**
# **firewall-cmd --add-port 3121/tcp --permanent**
# **firewall-cmd --add-port 2224/tcp --permanent**
# **firewall-cmd --reload**
```

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

### Enable and start nm-cloud-setup service

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/configuring_and_managing_networking/automatically-configuring-network-interfaces-in-public-clouds-using-nm-cloud-setup_configuring-and-managing-networking

Activate the service to begin automatic network configuration.

```bash
# systemctl enable --now nm-cloud-setup.service
```

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

### Exclude Installation Files

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/automatically_installing_rhel/custom-boot-options_rhel-installer

Example of using the inst.nosave boot option to prevent specific installation logs and Kickstart files from being saved to the system.

```text
inst.nosave=Input_ks,logs
```

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

### Create the example group

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/deploying_different_types_of_servers/assembly_using-samba-as-a-server_deploying-different-types-of-servers

Create a local group to manage user share permissions.

```bash
# **groupadd example**
```

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

### Start RHEL for Edge Installer image composition

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/composing_installing_and_managing_rhel_for_edge_images/assembly_deploying-a-non-network-rhel-for-edge-image_composing-installing-managing-rhel-for-edge-images

Initiates the build process for an edge installer image by specifying the OSTree reference and repository URL.

```bash
# composer-cli compose start-ostree --ref _rhel/8/x86_64/edge_ --url _URL-OSTree-repository_ _blueprint-name_ _image-type_
```

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

### Install and Configure Guest Node Services

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/configuring_and_managing_high_availability_clusters/assembly_remote-node-management-configuring-and-managing-high-availability-clusters

Commands to install necessary packages, start the pcsd service, and open required firewall ports on the virtual machine.

```bash
# yum install pacemaker-remote resource-agents pcs
# systemctl start pcsd.service
# systemctl enable pcsd.service
# firewall-cmd --add-port 3121/tcp --permanent
# firewall-cmd --add-port 2224/tcp --permanent
# firewall-cmd --reload
```

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

### Example: Resource ordering and relations

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/configuring_and_managing_high_availability_clusters/proc_displaying-resource-constraints.adoc-configuring-and-managing-high-availability-clusters

Demonstrates configuring ordering constraints and viewing the resulting resource relations tree.

```bash
# **pcs constraint order start C then start D**
Adding C D (kind: Mandatory) (Options: first-action=start then-action=start)
# **pcs constraint order start D then start E**
Adding D E (kind: Mandatory) (Options: first-action=start then-action=start)

# **pcs resource relations C**
C
`- order
   |  start C then start D
   `- D
      `- order
         |  start D then start E
         `- E
# **pcs resource relations D**
D
|- order
|  |  start C then start D
|  `- C
`- order
   |  start D then start E
   `- E
# pcs **resource relations E**
E
`- order
   |  start D then start E
   `- D
      `- order
         |  start C then start D
         `- C
```

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

### Configure geolocation parameters

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html-single/automatically_installing_rhel/index

Syntax examples for setting geolocation providers during installation.

```text
inst.geoloc=0
```

```text
inst.geoloc=provider_fedora_geoip
```

```text
inst.geoloc=provider_hostip
```

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

### Configure logging for %post scripts

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/automatically_installing_rhel/kickstart-script-file-format-reference_rhel-installer

Direct the output of post-installation scripts to a specified log file path.

```kickstart
%post --log=/root/ks-post.log
```

```kickstart
%post --nochroot --log=/mnt/sysroot/root/ks-post.log
```

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

### Example output for missing kexec-tools

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/managing_monitoring_and_updating_the_kernel/installing-kdump_managing-monitoring-and-updating-the-kernel

The expected output when the kexec-tools package is not installed.

```text
package kexec-tools is not installed
```

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

### Configure graphical installation mode

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/automatically_installing_rhel/kickstart-commands-and-options-reference_rhel-installer

Sets the installation to run in graphical mode, which is the default behavior.

```kickstart
graphical [--non-interactive]
```

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

### Example /etc/resolv.conf configuration

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/configuring_and_managing_identity_management/managing-global-dns-configuration-in-idm-using-ansible-playbooks_configuring-and-managing-idm

The standard /etc/resolv.conf file generated by the IdM installer.

```text
# Generated by NetworkManager
search idm.example.com
nameserver 127.0.0.1
```

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

### Create and Initialize Cluster

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html-single/deploying_rhel_8_on_amazon_web_services/console.redhat.com

Setup the cluster and enable/start it across all nodes.

```bash
# **pcs cluster setup _<cluster_name>_ _<hostname1>_ _<hostname2>_ _<hostname3>_**
```

```bash
[root@node01 clouduser]# **pcs cluster setup new_cluster node01 node02 node03**

[...]

Synchronizing pcsd certificates on nodes node01, node02, node03...
node02: Success
node03: Success
node01: Success
Restarting pcsd on the nodes in order to reload the certificates...
node02: Success
node03: Success
node01: Success
```

```bash
[root@node01 clouduser]# **pcs cluster enable --all**
node02: Cluster Enabled
node03: Cluster Enabled
node01: Cluster Enabled
```

```bash
[root@node01 clouduser]# **pcs cluster start --all**
node02: Starting Cluster...
node03: Starting Cluster...
node01: Starting Cluster...
```

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

### VM installation output

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/composing_a_customized_rhel_system_image/preparing-and-deploying-kvm-guest-images-with-image-builder_composing-a-customized-rhel-system-image

Example console output during the VM boot process.

```text
Starting install...
Connected to domain mytestcivm
...
[  OK  ] Started Execute cloud user/final scripts.
[  OK  ] Reached target Cloud-init target.

Red Hat Enterprise Linux 8 (Ootpa)
Kernel 4.18.0-221.el8.x86_64 on an x86_64
```

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

### Start a virtual machine

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/configuring_and_managing_virtualization/backing-up-and-recovering-virtual-machines_configuring-and-managing-virtualization

Initiates the startup process for a specified virtual machine.

```bash
# virsh start <vm-name>
```

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

### Install IdM replica with integrated DNS and no CA

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/installing_identity_management/installing-an-ipa-replica_installing-identity-management

Example command for installing an IdM replica in a CA-less environment, requiring specific certificate file paths and pins.

```bash
ipa-replica-install --setup-dns --forwarder 192.0.2.1 --dirsrv-cert-file /tmp/server.crt --dirsrv-cert-file /tmp/server.key --dirsrv-pin secret --http-cert-file /tmp/server.crt --http-cert-file /tmp/server.key --http-pin secret --no-pkinit
```

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

### Example I/O bandwidth configurations

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/managing_monitoring_and_updating_the_kernel/assembly_configuring-resource-management-using-systemd_managing-monitoring-and-updating-the-kernel

Examples of how to define specific I/O bandwidth constraints for devices or mount points.

```text
IODeviceWeight=/dev/disk/by-id/dm-name-rhel-root 200
```

```text
IOWriteBandwith=/var/log 5M
```

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

### Execute REXX script to boot

Source: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/automatically_installing_rhel/starting-kickstart-installations_rhel-installer

Run the redhat.exec script to start the installation program.

```REXX
redhat
```
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