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Jean-Philippe Evrard a239b29baf 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

2015-10-07 23:08:41 -05:00

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Home OpenStack-Ansible Installation Guide

Running the foundation playbook

Change to the /opt/openstack-ansible/playbooks directory.

Run the host setup playbook, which runs a series of sub-playbooks:

$ openstack-ansible setup-hosts.yml

Confirm satisfactory completion with zero items unreachable or failed:

PLAY RECAP ********************************************************************
...
deployment_host                :  ok=18   changed=11   unreachable=0    failed=0

If using HAProxy:
Note

If you plan to run haproxy on multiple hosts, you'll need keepalived to make haproxy highly-available. The keepalived role should have been downloaded during the bootstrap-ansible stage. If not, you should rerun the following command before running the haproxy playbook:
```
$ ../scripts/bootstrap-ansible.sh
```
or
```
$ ansible-galaxy install -r ../ansible-role-requirements.yml
```

Run the playbook to deploy haproxy:
$ openstack-ansible haproxy-install.yml

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Running the foundation playbook

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