Dialogic IMG - EMS Installation on RHEL-9

Table of Contents

Configuring IMG2020 EMS on RHEL9

This document provides a step-by-step guide for installing and configuring the IMG2020 Element Management System (EMS) on RHEL9 including necessary packages and dependencies.

Install RHEL9

Ensure that RHEL9 is installed on the target machine before proceeding with the configuration steps.

Register the System

Open a terminal and run the following command to register the system with Red Hat Subscription Manager:
subscription-manager register

Disable SELinux

• Open the SELinux configuration file for editing:
  vi /etc/selinux/config

• Modify the following line:
  SELINUX=disabled

• Save and exit the file.

Disable the Firewall

Run the following command to stop and disable the firewall service:
sudo systemctl disable firewalld

Install Prerequisite Packages

Install the necessary dependencies and utilities by running the following commands:

Install Packages for Redundant EMS

Install additional packages required for redundant EMS functionality:

Create the Dialogic User Profile

As a root or superuser, create a group labeled dialogic. The example will create a group profile labeled dialogic in /home. Refer to the example below.

[root@localhost ftpBuilds]# groupadd dialogic

Create a user labeled dialogic under the group dialogic.
[root@localhost ftpBuilds]# useradd -g dialogic dialogic

Add a password of Dial0gic to the user. (Capital D, Zero for 0)
[root@localhost etc]# passwd dialogic
New password: <Dial0gic>
Retype new password: <Dial0gic>

Within the /home/dialogic directory, a new directory labeled ftpBuilds should be created. Open a terminal window and go to /home/dialogic. Create the ftpBuilds directory as a dialogic user.
[dialogic@localhost]$ mkdir ftpBuilds

Install IMG2020 EMS RPM

Install the WebUI RPM package from the specified build path:
sudo rpm -ivh /path/to/webuid-2.3.12-5-LinuxRHEL9.rpm

Configuring NTP

For proper functionality of the redundant EMS, it is imperative that both EMS systems have the exact same time. To achieve this, NTP must be configured on both EMS systems.

You can easily verify if NTP is already configured by typing in “ntpstat”. If the NTP is properly configured then it should show something like this:

Configuring the ssh key

The redundant EMS systems synchronize database files using the rsync command. It is therefore required to configure the ssh key on both systems for proper functionality.

Generate key

Switch to dialogic user, Type in the following: “ssh-keygen -t rsa” then type in enter multiple times and accept overwrite questions until the public key is saved.

Copy the key

Type in the following: “ssh-copy-id dialogic@IP_ADDRESS_OF_SECONDARY” and type in “yes” followed by the dialogic user password (Dial0gic by default). Here’s an example:

Configuring the redundant EMS

Each EMS system has to be configured as the primary or secondary system. The file used to for the EMS configuration is named /opt/dialogic/bin/EMSRedund.conf. Type in the following commands to configure the EMS system:

You should see this :

###################################################################

# EMS REDUNDANCY CONFIGURATION #

###################################################################

Press 1 for STANDALONE, 2 for PRIMARY or 3 for SECONDARY:

If this is the primary EMS, type in 2 and if it’s the secondary system type in 3. If we want to revert back to a standalone EMS without any redundancy, type in 1.

EMS system set in PRIMARY mode - EMS redundancy will be configured

Enter IP address of peer EMS: 172.21.5.123

In this example we’ve entered 2 as we are configuring this EMS as the PRIMARY EMS. It then asks for the IP address of the peer EMS (IP address of SECONDARY EMS in our example).

Enter mail address for EMS notifications (Optional): someone@xyz.com

We can enter an e-mail address if we want to receive an e-mail notification when the EMS changes state.

Once this is entered the content of the EMSRedund.conf file is displayed. Verify that everything is correct. Finally it shows

###################################################################

# EMS REDUNDANCY CONFIGURED #

# #

# Press ENTER - This will restart the EMSRedund process #

###################################################################

Press enter and the EMSRedund process will restart with the new configuration.

Please verify that both EMS systems are properly configured.

Checking status of EMS

We can verify that status of the EMS by typing in the following: “service webuid status”

As an example, the primary system is the active system and we get:

We see that all services are running. We can use the web browser to connect to this EMS system.

Calling the same “service webuid status” command on the secondary system, we should get:

We see that all services are stopped except for the EMSRedund process. We will not be able to logon with the web browser on this standby system.