Solution Prerequisites

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Software Requirements

OS Compatibility

We require the customer/partner to install the following software on the server.

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Browser Compatibility

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Repeat the following steps for all the machines in the HA cluster.

1. Download   keepalived.sh script and place it in  /root  the directory.

2. Give execute permission and execute the script: 

   # chmod +x keepalived.sh # ./keepalived.sh

   
   

3. Configure keep.env file inside /root/keep-alived folder

   Name	Description
   KEEPALIVED_UNICAST_PEERS	Pear machine IP. 192.168.1.80
   KEEPALIVED_VIRTUAL_IPS	Virtual IP of the cluster. It should be available in the LAN. For example: 192.168.1.245
   KEEPALIVED_PRIORITY	Priority of the node. Instance with lower number will have a higher priority. It can take any value from 1-255.
   KEEPALIVED_INTERFACE	Name of the network interface with which your machine is connected to the network. On CentOS, ifconfig or ip addr sh will show all the network interfaces and assigned addresses.
   CLEARANCE_TIMEOUT	Corresponds to the initial startup time of the application in seconds which is being monitored by keepalived. A nominal value of 60-120 is good enough
   KEEPALIVED_ROUTER_ID	Do not change this value.
   SCRIPT_VAR	This script is continuously polled after 2 seconds. Keepalived relinquishes control if this shell script returns a non-zero response. It could be either umm or any backend microservice API. pidof dockerd && wget -O index.html http://localhost:7575/

   
   

4.  Update the SERVER_URL variable in environment variables to hold Virtual IP for front-end. Go to microservices table in UMM database, replace the name of tam, prompts and eabc microservices under ip_address column with Virtual IP. Change the ports to corresponding ports exposed in docker-compose file.

5. Give the execute permission and execute the script on both machine.

   
   

   # chmod +x keep-command.sh # ./keep-command.sh

   
   

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