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Accepted
RogerSik
Asked: 2015-06-06 14:41:03 +0800 CST

KeepAliveD + HaProxy - Only the master should run an active HaProxy service

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it is possible to configure keepalived so that only the master server are running an active service from haproxy?

Currently LB1 and LB2 (both with keepalived and haproxy) works great. But sometimes some requests is taken from LB2 (which is backup and the logs show it also) which results in an connection error in the browser

I deactivated haproxy on LB2 (service haproxy stop) and everything works fine. But now when LB1 goes down LB2 is going into master with an not started haproxy service.

I'm using Ubuntu Server 14.04.

ubuntu

1 Answers

  1. Best Answer

    The method is notify named. You have to put example in keepalived.conf (on both servers:

    notify /etc/keepalived/notify-keepalived.sh

    And in the notfiy-keepalived.sh following code:

    #!/bin/bash
TYPE=$1
NAME=$2
STATE=$3
case $STATE in
        "MASTER") /usr/sbin/service haproxy start
                  ;;
        "BACKUP") /usr/sbin/service haproxy stop
                  ;;
        "FAULT")  /usr/sbin/service haproxy stop
                  exit 0
                  ;;
        *)        /sbin/logger "haproxy unknown state"
                  exit 1
                  ;;
esac

    Now keepalived will do the commands when its entering in one of the three states.

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