Keepalived for Rancher HA

Description

This is a CentOS based keepalived image. This image was built and customized specifically for use with Rancher 2.0 deployed in an HA 3-node K8s environment.

Building

To build this image, simply run docker build . in the directory of the docker file.

Configuration

Important Notes

• A host mount of /lib/modules must be made into this container, as the container performs a check/load of the ip_vs kernel module on startup.
• VRRP must be enabled as an incoming iptables/firewalld rule, this container utilizes unicast to communicate between instances of keepalived.

Environment Variables

The following environment variables need to be set in order to allow the keepalived container to function properly.

Required Environment Variables

Environment Variable	Description	Example
VIP	The Virtual IP Address for Rancher HA	192.168.1.5
IFACE	The Interface to Add/Remove the VIP from	eth0
RANCHER_HOSTNAME	The server-url for Rancher	demo1.rancher.space
VRRP_PASS	The password for VRRP (max 8 characters)	mypaswrd
VR_ID	The Virtual Router ID	54
PEERS	A semi-colon delimited list of peers	192.168.1.10;192.168.1.11;192.168.1.12

Optional Environment Variables

Environment Variable	Description	Example
KEEPALIVED_OPTIONS	Optional Keepalived Command Line Arguments	--log-detail

Built by Chris Kim @ Rancher Labs

Loosely based on

• rht/ipfailover
• osixia/docker-keepalived