Introduction

This is a very brief guide which provides the necessary steps to install Rocky Linux or Red Hat. For this guide, the following ISO has been used: Rocky-9.4-x86_64-minimal.iso (some steps may vary in other versions).

Steps to install the operating system

1. Download the ISO from the official Rocky website. Then upload it to your virtualization system, and boot it up.

2. Upon booting, a graphical setup wizard is displayed. Configure at least the following sections:

   1. Language, Keyboard, and Time Zone.

   2. Installation destination: Automatic partitioning. Enter and click “Done” to select this mode.

   3. Software Selection → Minimal install.

   4. Network & Host Name: Enter configuration, IPv4 tab. Choose the “Manual” method, then add IP addresses (the Master requires at least two interfaces when deployed with SIP Registrar, see sample screenshot).
      
      

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   5. Root Password & User Creation.

      1. Recommendation: create a user (e.g., opengate) with a password and check the Administrator option. Do not activate or set a password for the root user; use sudo with the administrator user.

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Example. When the steps above are completed, click on Begin Installation.

Once the installation is complete, restart the machine, eject the installation disk, and verify that it boots up and can be connected via SSH (ssh opengate@ip.ip.ip.ip, where opengate is the user configured during the installation).

Steps to install Docker

Once connected to the system console, execute the following commands:

1. If you need to modify the network configuration:

   sudo nmtui

2. Disable the firewall:

   sudo systemctl disable firewalld sudo systemctl stop firewalld

3. Install Docker:

   sudo dnf config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo sudo dnf -y install docker-ce docker-ce-cli containerd.io docker-compose-plugin sudo systemctl --now enable docker

   If installing on Red Hat, the repository is different. Execute these commands:

4. Add the user to the "docker" group (if this is not done, all Docker commands will need to be executed with sudo):

   After executing this command, it is necessary to log out and reconnect for the permissions to take effect. Logout with exit and then re-establish the SSH connection.

5. Once reconnected, verify that Docker is running with the command docker info, which will display information similar to the following:

Other OS level configuration

Multiple IP addresses

If you do not configure them using the install user interface, start the console configuration with sudo nmtui, select the appropriate connection, then use the “Add…” option inside Addresses section to add the new IP.

For Azure installations, follow the official documentation Assign multiple IP addresses to VMs - Azure portal

NTP synchronization

By default, it is configured to sync with public servers. If you want to configure it to sync with the machine running OpenGate Proxy Server, edit the file /etc/chrony.conf, remove the public servers, and add the following instead:

Where ip.ip.ip.ip is the IP address of the OpenGate Proxy Server machine.

In the OpenGate Proxy Windows machine the NTP Server can be enabled with the following steps:

1. Disable the Windows NTP client. You must first open the date and time configuration settings, select the Internet Time tab and click on Change settings. Next, uncheck the Synchronize with an Internet time server box, as shown below:

2. Enable the Windows NTP server. You must first create a file named NTPServerEnable.reg with the following:

3. Run the NTPServerEnable.reg file created and accept the prompt to import the data into the registry. Open a command prompt as administrator and issue the following commands:

Email service

On the OpenGate Master node, it is necessary to install "postfix" in order to send voicemails:

Email relay

See Configuring email relay for voicemails