B) Testing high availability with Docker

This file contains two definitions, the main container with apache and php installed and the container with haproxy

Run

# docker-compose up -d

Verify

# docker-compose ps
      Name                    Command               State                   Ports
-------------------------------------------------------------------------------------------------
looptalks_ha_1     python /haproxy/main.py          Up      1936/tcp, 443/tcp, 0.0.0.0:80->80/tcp
looptalks_php5_1   /bin/sh -c /usr/sbin/apach ...   Up      0.0.0.0:32773->80/tcp

Now run

# docker-compose scale php5=n

Where n is the number of nodes

Changue the settings on docker-compose.yml

Before load the changues you need run

# docker-compose down

or only

# docker-compose up -d --force-recreate --no-deps ha

Verify and testing

http://127.0.0.1