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* Make sure that Upstart notices when the Zabbix server crashes so

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that it can be restarted.  Zabbix is kind of hard to monitor, so use
  a trick with an open fifo to detect when it goes down.

svn path=/nixos/trunk/; revision=20039
This commit is contained in:
Eelco Dolstra 2010-02-16 10:10:59 +00:00
parent 1dd3162d7c
commit 9127795e4a
1 changed files with 17 additions and 3 deletions
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20
modules/services/monitoring/zabbix-server.nix
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@ -74,15 +74,29 @@ in
cat ${pkgs.zabbix.server}/share/zabbix/db/data/images_pgsql.sql | ${pkgs.su}/bin/su -s "$SHELL" zabbix -c '${pkgs.postgresql}/bin/psql zabbix'
touch "${libDir}/db-created"
fi
'';
# Zabbix doesn't have an option not to daemonize, and doesn't
# daemonize in a way that allows Upstart to track it. So to
# make sure that we notice when it goes down, we start Zabbix
# with an open connection to a fifo, with a `cat' on the other
# side. If Zabbix dies, then `cat' will exit as well, so we
# just monitor `cat'.
script =
''
export PATH=${pkgs.nettools}/bin:$PATH
${pkgs.zabbix.server}/sbin/zabbix_server --config ${configFile}
rm -f ${stateDir}/dummy
mkfifo ${stateDir}/dummy
cat ${stateDir}/dummy &
pid=$!
${pkgs.zabbix.server}/sbin/zabbix_server --config ${configFile} 100>${stateDir}/dummy
wait "$pid"
'';
postStop =
''
pid=$(cat ${pidFile})
test -n "$pid" && kill "$pid"
pid=$(cat ${pidFile} 2> /dev/null || true)
(test -n "$pid" && kill "$pid") || true
# Wait until they're really gone.
while ${pkgs.procps}/bin/pkill -u zabbix zabbix_server; do true; done
'';