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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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 The jeepyb script create-cgitrepos runs against projects.yaml to generate the
/etc/cgitrepos file listing all the git repositories. The git repositories are /etc/cgitrepos file listing all the git repositories. The git repositories are
synced to all the nodes from the Gerrit server. 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