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Redundant deployment with docker compose


Wallboard deployment

Follow this guide to deploy the Wallboard on two machines.

Virtual IP configuration

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

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

    IPs of the machines in the cluster. On each machine, this variable should have the IP of the other machine in HA.

    KEEPALIVED_VIRTUAL_IPS

    Virtual IP of the cluster. It should be available in the LAN. For example: 192.168.1.245

    KEEPALIVED_PRIORITY

    The priority of the node. Instances with lower numbers 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 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. For wallboard, it should be:

    pidof dockerd && wget -O index.html https://localhost:443


  4. Give the execute permission and execute the script: 

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