Comment 6 for bug 1414397

Reviewed: https://review.openstack.org/218818
Committed: https://git.openstack.org/cgit/openstack/openstack-ansible/commit/?id=a239b29baf21dc09570b55f45d86f70581841602
Submitter: Jenkins
Branch: master

commit a239b29baf21dc09570b55f45d86f70581841602
Author: Jean-Philippe Evrard <email address hidden>
Date: Mon Aug 31 13:44:46 2015 +0200

    Implementation of keepalived for haproxy

    This commit uses a keepalived role, available in
    ansible galaxy, to configure keepalived for haproxy

    Keepalived makes the haproxy truely HA, by having
    haproxy's VIP highly available between the hosts
    defined in the inventory.

    The keepalived role configuration is fully
    documented on the upstream role.

    To configure keepalived on your host, you only have to
    give it a variable (dict). A template handles the
    generation of the configuration of keepalived.

    By default, the variable files defined in vars/configs/
    are enough to have a keepalived working for haproxy,
    with a master-backup configuration.

    You can define other variable files by setting
    haproxy_keepalived_(master|backup)_vars in your
    user_variables. This should point to a "variable
    template" file like the one you can find
    in vars/configs/*

    The haproxy playbook has been changed to rely on
    the dynamic generation script. It will use the env.d
    to have haproxy hosts. The first host from the
    generated inventory will be considered as master,
    while the others are slaves. The keepalived role
    will only run if more than haproxy host is found
    in the inventory. This behaviour can be changed
    and keepalived can be disabled by the variable:
    haproxy_use_keepalived.

    The implemented variables are the following:
    * haproxy_keepalived_(ext|int)ernal_vip_cidr
    * haproxy_keepalived_(ext|int)ernal_interface
    * haproxy_keepalived_(ext|int)ernal_virtual_router_id
    * haproxy_keepalived_priority_backup
    * haproxy_keepalived_priority_master
    * haproxy_keepalived_vars_file

    In these variables, only the following variables
    are necessary: keepalived_(ext|int)ernal_vip_cidr
    However, it's recommended to also configure the
    keepalived_(ext|int)ernal_interface
    (to know which interface the vips can bind on)

    Closes-Bug: 1414397
    Change-Id: Ib87a3bb70d6f4b7ac9356e8a28fe4b5936eb9334