You can changed the keepalived version just by changing the ENV KEEPALIVED_VERSION to the your desired version.
This image is simply a base image for you. There are several ways for you to get started.
docker run -d -e VIP=<vip> -e PRIORITY=100 -e LOCALIP=<localip> -e PEERIP=<peerip> softputer/keepalived
VIP: this is the floating ip that can be transferred among several machines.
LOCALIP: this is meant to be the ip originally on eth0.
PEERIP:this is the backup node ip.
Master.sh file helps trasffer ips. As the variety of the cloud platforms, there is no common method for you to transfer ip among vms. You have to customize your own master.sh to get this image properly running.
If you have any questions about the usage of this image or the configuration of nginx, you can contact my by email: gyj3023@foxmail.com.