opendev/system-config
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Add haproxy maintenance instructions

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Change-Id: I236d55a0bbc44d29ef4290972dc30d68f683c040
This commit is contained in:
James E. Blair 2018-04-04 07:47:45 -07:00
parent 9b8b7ab2ad
commit b1fff1d2eb
1 changed files with 31 additions and 0 deletions
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31
doc/source/git.rst
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@ -44,3 +44,34 @@ host will be served by one backend node unless nodes are added or removed.
The jeepyb script create-cgitrepos runs against projects.yaml to generate the
/etc/cgitrepos file listing all the git repositories. The git repositories are
synced to all the nodes from the Gerrit server.
Backend Maintenance
===================
To temporarily remove a git backend from the HAProxy load balancer,
you can put it in "maintenance" mode. This can be done interactively
on the HAProxy host. Note that long-term changes to the topology
should be made via configuration management. These commands must be
run as root.
To see the current status of all servers::
echo "show stat" | socat /var/lib/haproxy/stats stdio
To disable a server (eg, git08)::
echo "disable server balance_git_daemon/git08.openstack.org" | socat /var/lib/haproxy/stats stdio
echo "disable server balance_git_http/git08.openstack.org" | socat /var/lib/haproxy/stats stdio
echo "disable server balance_git_https/git08.openstack.org" | socat /var/lib/haproxy/stats stdio
To re-enable a server::
echo "enable server balance_git_daemon/git08.openstack.org" | socat /var/lib/haproxy/stats stdio
echo "enable server balance_git_http/git08.openstack.org" | socat /var/lib/haproxy/stats stdio
echo "enable server balance_git_https/git08.openstack.org" | socat /var/lib/haproxy/stats stdio
To run these commands and others interactively, issue the prompt
command to haproxy::
socat readline /var/lib/haproxy/stats
prompt