init

image/Dockerfile

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+FROM osixia/baseimage:0.10.4
+MAINTAINER Bertrand Gouny <bertrand.gouny@osixia.net>
+
+# This container need run options :
+# --privileged=true
+# --net=host
+
+# Use baseimage-docker's init system.
+CMD ["/sbin/my_init"]
+
+# Install Keepalived
+RUN apt-get -y update \
+    && LC_ALL=C DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+    keepalived
+
+# Add Keepalived assets
+ADD service/keepalived/assets /osixia/keepalived
+
+# Run clean all
+RUN apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+# Add default env variables
+ADD env.yml /etc/env.yml
+
+# Add Keepalived container start config & daemon
+ADD service/keepalived/container-start.sh /etc/my_init.d/keepalived
+ADD service/keepalived/daemon.sh /etc/service/keepalived/run

image/env.yml

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+KEEPALIVED_PASSWORD: d0cker
+
+# for electing MASTER, highest priority wins.
+# to be MASTER, make 50 more than other machines
+KEEPALIVED_PRIORITY: 150
+
+KEEPALIVED_UNICAST_PEER:
+  - 172.17.8.101
+  - 172.17.8.102
+  - 172.17.8.103
+
+KEEPALIVED_VIRTUAL_IPS:
+  - 192.168.200.17/24 dev eth1
+  - 192.168.200.18/24 dev eth2 label eth2:1

image/service/keepalived/assets/README.md

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+Add your custom keepalived.conf file here or mount one at docker run to /etc/keepalived/keepalived.conf

image/service/keepalived/assets/keepalived.conf

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+vrrp_instance VI_1 {
+  interface eno1
+  state MASTER
+  virtual_router_id 51
+  priority {{ keepalived_priority }}
+
+  unicast_peer {
+    {{ peer_ip }}
+  }
+
+  virtual_ipaddress {
+    {{ floating_ip }}
+  }
+
+  authentication {
+    auth_type PASS
+    auth_pass {{ keepalived_password }}
+  }
+}

image/service/keepalived/container-start.sh

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+#!/bin/bash -e
+
+FIRST_START_DONE="/etc/docker-keepalived-first-start-done"
+
+# container first start
+if [ ! -e "$FIRST_START_DONE" ]; then
+
+  # config folder is empty use bootstrap config if available
+  if [ ! -e /etc/keepalived/keepalived.conf ]; then
+    echo "No keepalived.conf provided using image default one"
+    if [ ! -e /osixia/keepalived/keepalived.conf ]; then
+      echo "Error: No default keepalived.conf found in /osixia/keepalived/keepalived.conf"
+      exit 1
+    else
+      ln -s /osixia/keepalived/keepalived.conf /etc/keepalived/keepalived.conf
+    fi
+  fi
+
+  touch $FIRST_START_DONE
+fi
+
+exit 0

image/service/keepalived/daemon.sh

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+#!/bin/bash -e
+exec /usr/sbin/keepalived -f /etc/keepalived/keepalived.conf --dont-fork --log-console