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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