docker-keepalived

by osixia

A docker image to run Keepalived 🐳

225 Stars 77 Forks Last release: 12 months ago (v2.0.19) MIT License 212 Commits 41 Releases

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osixia/keepalived

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Latest release: 2.0.20 - Keepalived 2.0.20 - Changelog | Docker Hub 

A docker image to run Keepalived.

keepalived.org

Quick start

This image require the kernel module ipvs loaded on the host (`modprobe ipvs`) and need to be run with : --cap-add=NET_ADMIN --net=host

docker run --cap-add=NET_ADMIN --cap-add=NET_BROADCAST --cap-add=NET_RAW --net=host -d osixia/keepalived:2.0.20

Beginner Guide

Use your own Keepalived config

This image comes with a keepalived config file that can be easily customized via environment variables for a quick bootstrap, but setting your own keepalived.conf is possible. 2 options:

  • Link your config file at run time to

    /container/service/keepalived/assets/keepalived.conf
    :

    docker run --volume /data/my-keepalived.conf:/container/service/keepalived/assets/keepalived.conf --detach osixia/keepalived:2.0.20

  • Add your config file by extending or cloning this image, please refer to the Advanced User Guide

Fix docker mounted file problems

You may have some problems with mounted files on some systems. The startup script try to make some file adjustment and fix files owner and permissions, this can result in multiple errors. See Docker documentation.

To fix that run the container with

--copy-service
argument :
    docker run [your options] osixia/keepalived:2.0.20 --copy-service

Debug

The container default log level is info. Available levels are:

none
,
error
,
warning
,
info
,
debug
and
trace
.

Example command to run the container in

debug
mode:
docker run --detach osixia/keepalived:2.0.20 --loglevel debug

See all command line options:

docker run osixia/keepalived:2.0.20 --help

Environment Variables

Environment variables defaults are set in image/environment/default.yaml

See how to set your own environment variables

  • KEEPALIVED_INTERFACE: Keepalived network interface. Defaults to
    eth0
  • KEEPALIVED_PASSWORD: Keepalived password. Defaults to
    d0cker
  • KEEPALIVED_PRIORITY Keepalived node priority. Defaults to
    150
  • KEEPALIVEDROUTERID Keepalived virtual router ID. Defaults to

    51
  • KEEPALIVEDUNICASTPEERS Keepalived unicast peers. Defaults to :

    • 192.168.1.10
    • 192.168.1.11

If you want to set this variable at docker run command add the tag

#PYTHON2BASH:
and convert the yaml in python:
  docker run --env KEEPALIVED_UNICAST_PEERS="#PYTHON2BASH:['192.168.1.10', '192.168.1.11']" --detach osixia/keepalived:2.0.20

To convert yaml to python online : http://yaml-online-parser.appspot.com/

  • KEEPALIVEDVIRTUALIPS Keepalived virtual IPs. Defaults to :

    • 192.168.1.231
    • 192.168.1.232

If you want to set this variable at docker run command convert the yaml in python, see above.

  • KEEPALIVED_NOTIFY Script to execute when node state change. Defaults to

    /container/service/keepalived/assets/notify.sh
  • KEEPALIVEDCOMMANDLINE_ARGUMENTS Keepalived command line arguments; Defaults to

    --log-detail --dump-conf
  • KEEPALIVED_STATE The starting state of keepalived; it can either be MASTER or BACKUP.

Set your own environment variables

Use command line argument

Environment variables can be set by adding the --env argument in the command line, for example:

docker run --env KEEPALIVED_INTERFACE="eno1" --env KEEPALIVED_PASSWORD="password!" \
--env KEEPALIVED_PRIORITY="100" --detach osixia/keepalived:2.0.20

Link environment file

For example if your environment file is in : /data/environment/my-env.yaml

docker run --volume /data/environment/my-env.yaml:/container/environment/01-custom/env.yaml \
--detach osixia/keepalived:2.0.20

Take care to link your environment file to

/container/environment/XX-somedir
(with XX < 99 so they will be processed before default environment files) and not directly to
/container/environment
because this directory contains predefined baseimage environment files to fix container environment (INITRD, LANG, LANGUAGE and LC_CTYPE).

Make your own image or extend this image

This is the best solution if you have a private registry. Please refer to the Advanced User Guide just below.

Advanced User Guide

Extend osixia/keepalived:2.0.20 image

If you need to add your custom TLS certificate, bootstrap config or environment files the easiest way is to extends this image.

Dockerfile example:

FROM osixia/keepalived:2.0.20
MAINTAINER Your Name 

ADD keepalived.conf /container/service/keepalived/assets/keepalived.conf ADD environment /container/environment/01-custom ADD scripts.sh /container/service/keepalived/assets/notify.sh

Make your own keepalived image

Clone this project :

git clone https://github.com/osixia/docker-keepalived
cd docker-keepalived

Adapt Makefile, set your image NAME and VERSION, for example :

NAME = osixia/keepalived
VERSION = 1.3.5

becomes : NAME = billy-the-king/keepalived VERSION = 0.1.0

Add your custom scripts, environment files, config ...

Build your image :

make build

Run your image :

docker run -d billy-the-king/keepalived:0.1.0

Tests

We use Bats (Bash Automated Testing System) to test this image:

https://github.com/bats-core/bats-core

Install Bats, and in this project directory run :

make test

Under the hood: osixia/light-baseimage

This image is based on osixia/light-baseimage. More info: https://github.com/osixia/docker-light-baseimage

Security

If you discover a security vulnerability within this docker image, please send an email to the Osixia! team at [email protected] For minor vulnerabilities feel free to add an issue here on github.

Please include as many details as possible.

Changelog

Please refer to: CHANGELOG.md

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