### Install and Start Apache HTTP Server for RHEL Mirror

Source: https://docs.mattermost.com/deployment-guide/reference-architecture/deployment-scenarios/air-gapped-deployment.html

Installs and enables the Apache HTTP server to host the RHEL package mirror.

```bash
yum install httpd
systemctl enable httpd
systemctl start httpd

```

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

### Install Mattermost Desktop App using MSI

Source: https://docs.mattermost.com/deployment-guide/desktop/desktop-msi-installer-and-group-policy-install.html

Install the Mattermost Desktop App by double-clicking the MSI installer. Administrator privileges are required for installation.

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

### dbcmp Example with DSN Strings

Source: https://docs.mattermost.com/deployment-guide/manual-postgres-migration.html

An example command demonstrating how to provide DSN strings for both source and target databases when using dbcmp. The PostgreSQL DSN must start with 'postgres://'.

```bash
dbcmp --source "user:password@tcp(address:3306)/db_name --target "postgres://user:password@address:5432/db_name
```

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

### Download and Install Loki

Source: https://docs.mattermost.com/administration-guide/scale/deploy-grafana-loki-for-centralized-logging.html

Installs Loki binary and copies the configuration file. Ensure you have `unzip` installed.

```bash
sudo apt-get install -y unzip
cd /tmp
curl -LO https://github.com/grafana/loki/releases/download/v3.4.2/loki-linux-amd64.zip
unzip loki-linux-amd64.zip
sudo mv loki-linux-amd64 /opt/loki/bin/loki
sudo chmod +x /opt/loki/bin/loki
```

```bash
sudo cp loki-config.yaml /opt/loki/loki-config.yaml
```

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

### Get Mattermost Version (Default Installation)

Source: https://docs.mattermost.com/administration/command-line-tools.html

Run this command from the Mattermost root directory to display the Mattermost version. Ensure you run the binary as the `mattermost` user to avoid permission issues.

```bash
cd /opt/mattermost/
sudo -u mattermost bin/mattermost version

```

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

### Start Mattermost Server

Source: https://docs.mattermost.com/administration/upgrade.html

Starts the Mattermost server using systemd.

```bash
sudo systemctl start mattermost

```

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

### Enable and Start Elasticsearch Service

Source: https://docs.mattermost.com/administration-guide/scale/elasticsearch-setup.html

Use these commands to enable the Elasticsearch service to start on boot and then start it immediately.

```bash
sudo /bin/systemctl daemon-reload
sudo /bin/systemctl enable elasticsearch.service
sudo systemctl start elasticsearch.service
```

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

### Enable and Start OpenSearch Service

Source: https://docs.mattermost.com/administration-guide/scale/opensearch-setup.html

Reloads the systemd daemon, enables the OpenSearch service to start on boot, and starts the service.

```bash
sudo systemctl daemon-reload
sudo systemctl enable opensearch
sudo systemctl start opensearch
sudo systemctl status opensearch
```

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

### Get Mattermost Version (Docker Install)

Source: https://docs.mattermost.com/administration/command-line-tools.html

Use this command to get the Mattermost version when installed via Docker. Replace `<your-mattermost-container-name>` with your actual container name.

```bash
docker exec -it <your-mattermost-container-name> mattermost version

```

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

### Copy environment example file

Source: https://docs.mattermost.com/deployment-guide/server/deploy-containers.html

Create your .env file by copying the env.example file. Remember to edit the DOMAIN and MM_SUPPORTSETTINGS_SUPPORTEMAIL values.

```bash
cp env.example .env
```

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

### Serve Aptly Mirror Repository

Source: https://docs.mattermost.com/deployment-guide/reference-architecture/deployment-scenarios/air-gapped-deployment.html

Starts a local web server to serve the Aptly mirror repository over HTTP.

```bash
aptly serve

```

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

### Get Mattermost Installation Status

Source: https://docs.mattermost.com/deployment-guide/server/deploy-kubernetes.html

Use this command to review the status of your Mattermost installation after it has been created by the Operator.

```bash
kubectl -n [namespace] get mattermost
```

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

### Example config.json for Pre-configuration

Source: https://docs.mattermost.com/deployment-guide/desktop/silent-windows-desktop-distribution.html

Create this `config.json` file in the user's Mattermost data directory (`%APPDATA%\Mattermost\config.json`) before the first launch to pre-configure servers and settings.

```json
{
  "version": 2,
  "teams": [
    {
      "name": "core",
      "url": "https://community.mattermost.com",
      "order": 0
    },
    {
      "name": "hq",
      "url": "https://hq.example.com",
      "order": 1
    }
  ],
  "showTrayIcon": true,
  "trayIconTheme": "light",
  "minimizeToTray": true,
  "notifications": {
    "flashWindow": 2,
    "bounceIcon": true,
    "bounceIconType": "informational"
  },
  "showUnreadBadge": true,
  "useSpellChecker": true,
  "enableHardwareAcceleration": true,
  "autostart": false,
  "spellCheckerLocale": "en-US",
  "darkMode": false
}
```

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

### Find Mattermost Product Code GUID

Source: https://docs.mattermost.com/deployment-guide/desktop/silent-windows-desktop-distribution.html

Use this PowerShell command to find the Product Code GUID for your installed Mattermost version, which is required for silent uninstallation.

```powershell
Get-WmiObject -Class Win32_Product | Where-Object {$_.Name -like "*Mattermost*"} | Select-Object Name, IdentifyingNumber
```

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

### Install migration-assist Tool

Source: https://docs.mattermost.com/deployment-guide/postgres-migration-assist-tool.html

Install the latest version of the `migration-assist` tool using Go version 1.22 or later.

```bash
go install github.com/mattermost/migration-assist/cmd/migration-assist@latest
```

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

### Run Go Profiler

Source: https://docs.mattermost.com/administration-guide/scale/performance-monitoring-metrics.html

Use the Go tool pprof to run the profiler against a specified duration. Replace `localhost` with your server name and `<port>` with the correct port number.

```bash
go tool pprof http://localhost:<port>/debug/pprof/profile?seconds=<duration>
```

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

### Mattermost DB Reset Example

Source: https://docs.mattermost.com/administration/command-line-tools.html

Resets the database to its initial state by truncating all tables except `migrations`. This command does not start the application server.

```bash
bin/mattermost db reset
```

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

### Create Directories and Set Permissions

Source: https://docs.mattermost.com/administration-guide/configure/calls-offloader-setup.html

Use these commands to create necessary directories and set ownership for the calls-offloader service.

```bash
sudo mkdir -p /opt/calls-offloader/data/db
sudo useradd --system --home /opt/calls-offloader calls-offloader
sudo chown -R calls-offloader:calls-offloader /opt/calls-offloader

```

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

### Get System Logs Between Two Times

Source: https://docs.mattermost.com/deployment-guide/server/troubleshooting.html

Retrieve system logs within a specific time range. Replace the timestamps with the desired start and end times.

```bash
sudo journalctl --since "2020-08-23 17:15:00" --until "2020-08-23 16:30:00" > mattermost_journalctl.log

```

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

### Create Sample Users with Profile Pictures

Source: https://docs.mattermost.com/administration-guide/manage/mmctl-command-line-tool.html

Generate sample users and assign profile pictures from a specified local directory.

```bash
mmctl sampledata --profile-images ./images/profiles
```

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

### Systemd Service Configuration for Mattermost

Source: https://docs.mattermost.com/deploy/server/preparations.html

This is an example systemd service file for Mattermost. It includes basic setup, restart policies, and commented-out proxy environment variables.

```systemd
[Unit]
Description=Mattermost
After=network.target
After=postgresql.service
BindsTo=postgresql.service

[Service]
Type=notify
ExecStart=/opt/mattermost/bin/mattermost
TimeoutStartSec=3600
KillMode=mixed
Restart=always
RestartSec=10
WorkingDirectory=/opt/mattermost
User=mattermost
Group=mattermost
LimitNOFILE=49152

# Configure proxy settings if needed
#Environment=HTTP_PROXY=http://proxy.example.com:3128
#Environment=HTTPS_PROXY=https://proxy.example.com:3128
#Environment=NO_PROXY=localhost,127.0.0.1,.internal.example.com

# Recommended security options
ProtectSystem=full
PrivateTmp=true
NoNewPrivileges=true

[Install]
WantedBy=postgresql.service

```

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

### Create Loki User and Directories

Source: https://docs.mattermost.com/administration-guide/scale/deploy-grafana-loki-for-centralized-logging.html

Set up a dedicated system user and necessary directories for Loki on the monitoring server. This prepares the environment for Loki installation.

```bash
# Create a dedicated system user
sudo useradd --system --no-create-home --shell /bin/false loki

# Create directories
sudo mkdir -p /opt/loki/data /opt/loki/bin

```

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

### Terraform Docker OpenSearch Setup

Source: https://docs.mattermost.com/administration-guide/scale/opensearch-setup.html

Use this Terraform configuration to set up a single-node OpenSearch instance using Docker. It includes installing the ICU analysis plugin.

```terraform
provider "docker" {
  host = "unix:///var/run/docker.sock"
}

resource "docker_image" "opensearch" {
  name = "opensearchproject/opensearch:2.9.0"
}

resource "docker_container" "opensearch" {
  name = "opensearch"
  image = docker_image.opensearch.latest

  ports {
    internal = 9200
    external = 9200
  }
  ports {
    internal = 9600
    external = 9600
  }

  env = [
    "cluster.name=mattermost-cluster",
    "network.host=0.0.0.0",
    "discovery.type=single-node", # remove for multi-node
  ]

  restart = "unless-stopped"
}

resource "null_resource" "install_icu_plugin" {
  depends_on = [docker_container.opensearch]

  provisioner "local-exec" {
    command = "docker exec opensearch /usr/share/opensearch/bin/opensearch-plugin install analysis-icu && docker restart opensearch"
  }
}

```

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

### Install Plugin from URL with mmctl

Source: https://docs.mattermost.com/administration-guide/manage/mmctl-command-line-tool.html

Install plugins by providing URLs to their compressed .tar.gz files. Ensure plugins are enabled in the server's configuration settings.

```bash
# You can install one plugin
$ mmctl plugin install-url https://example.com/mattermost-plugin.tar.gz
```

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

### Delete Old Files During Upgrade

Source: https://docs.mattermost.com/administration/upgrade.html

Use this command to remove old files and directories from the Mattermost installation, excluding specific directories like 'client', 'config', 'logs', 'plugins', 'data', and a custom folder. The `-o -path mattermost/yourFolderHere` part is an example and should be adjusted.

```bash
sudo find mattermost/ mattermost/client/ -mindepth 1 -maxdepth 1 \! \( -type d \( -path mattermost/client -o -path mattermost/client/plugins -o -path mattermost/config -o -path mattermost/logs -o -path mattermost/plugins -o -path mattermost/data -o -path  mattermost/yourFolderHere \) -prune \) | sort | sudo xargs rm -r

```

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

### Example config.json structure for SiteURL

Source: https://docs.mattermost.com/configure/environment-configuration-settings.html

Illustrates the structure of the config.json file, showing the path to the SiteURL setting within ServiceSettings.

```json
{
  "ServiceSettings": {
    "SiteURL": "https://example.com/company/mattermost"
  }
}
```

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

### Configure helpLink for desktop app

Source: https://docs.mattermost.com/deployment-guide/desktop/distribute-a-custom-desktop-app.html

Set the URL for the help documentation accessible from the Help > Learn More menu. If not specified, this menu option is hidden. Expects a string.

```typescript
helpLink: 'https://docs.mattermost.com/messaging/managing-desktop-app-servers.html'
```

```typescript
helpLink: ''
```

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

### Install NGINX on Ubuntu

Source: https://docs.mattermost.com/deployment-guide/server/setup-nginx-proxy.html

Installs NGINX using the apt package manager. Update the package index before installing.

```bash
sudo apt update
sudo apt install nginx
```

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

### Set up Mattermost APT Repository

Source: https://docs.mattermost.com/deployment-guide/desktop/linux-desktop-install.html

Configure the Mattermost APT repository on Debian-based systems. This script downloads and installs the necessary GPG key and repository configuration.

```bash
curl -fsS -o- https://deb.packages.mattermost.com/setup-repo.sh | sudo bash
```