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Arrange for postmaster child processes to respond to two environment variables, PG_OOM_ADJUST_FILE and PG_OOM_ADJUST_VALUE, to determine whether they reset their OOM score adjustments and if so to what. This is superior to the previous design involving #ifdef's in several ways. The behavior is now available in a default build, and both ends of the adjustment --- the original adjustment of the postmaster's level and the subsequent readjustment by child processes --- can now be controlled in one place, namely the postmaster launch script. So it's no longer necessary for the launch script to act on faith that the server was compiled with the appropriate options. In addition, if someone wants to use an OOM score other than zero for the child processes, that doesn't take a recompile anymore; and we no longer have to cater separately to the two different historical kernel APIs for this adjustment. Gurjeet Singh, somewhat revised by me
122 lines
3.5 KiB
Bash
122 lines
3.5 KiB
Bash
#! /bin/sh
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# chkconfig: 2345 98 02
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# description: PostgreSQL RDBMS
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# This is an example of a start/stop script for SysV-style init, such
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# as is used on Linux systems. You should edit some of the variables
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# and maybe the 'echo' commands.
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#
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# Place this file at /etc/init.d/postgresql (or
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# /etc/rc.d/init.d/postgresql) and make symlinks to
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# /etc/rc.d/rc0.d/K02postgresql
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# /etc/rc.d/rc1.d/K02postgresql
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# /etc/rc.d/rc2.d/K02postgresql
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# /etc/rc.d/rc3.d/S98postgresql
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# /etc/rc.d/rc4.d/S98postgresql
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# /etc/rc.d/rc5.d/S98postgresql
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# Or, if you have chkconfig, simply:
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# chkconfig --add postgresql
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#
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# Proper init scripts on Linux systems normally require setting lock
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# and pid files under /var/run as well as reacting to network
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# settings, so you should treat this with care.
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# Original author: Ryan Kirkpatrick <pgsql@rkirkpat.net>
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# contrib/start-scripts/linux
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## EDIT FROM HERE
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# Installation prefix
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prefix=/usr/local/pgsql
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# Data directory
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PGDATA="/usr/local/pgsql/data"
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# Who to run the postmaster as, usually "postgres". (NOT "root")
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PGUSER=postgres
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# Where to keep a log file
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PGLOG="$PGDATA/serverlog"
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# It's often a good idea to protect the postmaster from being killed by the
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# OOM killer (which will tend to preferentially kill the postmaster because
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# of the way it accounts for shared memory). Setting the OOM_SCORE_ADJ value
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# to -1000 will disable OOM kill altogether, which is a good thing for the
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# postmaster, but not so much for individual backends. If you enable this,
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# also uncomment the DAEMON_ENV line, which will instruct backends to set
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# their OOM adjustments back to the default setting of zero.
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#OOM_SCORE_ADJ=-1000
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#DAEMON_ENV="PG_OOM_ADJUST_FILE=/proc/self/oom_score_adj"
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# Older Linux kernels may not have /proc/self/oom_score_adj, but instead
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# /proc/self/oom_adj, which works similarly except the disable value is -17.
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# For such a system, uncomment these two lines instead.
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#OOM_ADJ=-17
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#DAEMON_ENV="PG_OOM_ADJUST_FILE=/proc/self/oom_adj"
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## STOP EDITING HERE
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# The path that is to be used for the script
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PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
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# What to use to start up the postmaster. (If you want the script to wait
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# until the server has started, you could use "pg_ctl start -w" here.
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# But without -w, pg_ctl adds no value.)
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DAEMON="$prefix/bin/postmaster"
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# What to use to shut down the postmaster
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PGCTL="$prefix/bin/pg_ctl"
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set -e
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# Only start if we can find the postmaster.
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test -x $DAEMON ||
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{
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echo "$DAEMON not found"
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if [ "$1" = "stop" ]
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then exit 0
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else exit 5
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fi
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}
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# Parse command line parameters.
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case $1 in
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start)
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echo -n "Starting PostgreSQL: "
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test x"$OOM_SCORE_ADJ" != x && echo "$OOM_SCORE_ADJ" > /proc/self/oom_score_adj
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test x"$OOM_ADJ" != x && echo "$OOM_ADJ" > /proc/self/oom_adj
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su - $PGUSER -c "$DAEMON_ENV $DAEMON -D '$PGDATA' &" >>$PGLOG 2>&1
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echo "ok"
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;;
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stop)
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echo -n "Stopping PostgreSQL: "
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su - $PGUSER -c "$PGCTL stop -D '$PGDATA' -s -m fast"
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echo "ok"
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;;
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restart)
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echo -n "Restarting PostgreSQL: "
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su - $PGUSER -c "$PGCTL stop -D '$PGDATA' -s -m fast -w"
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test x"$OOM_SCORE_ADJ" != x && echo "$OOM_SCORE_ADJ" > /proc/self/oom_score_adj
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test x"$OOM_ADJ" != x && echo "$OOM_ADJ" > /proc/self/oom_adj
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su - $PGUSER -c "$DAEMON_ENV $DAEMON -D '$PGDATA' &" >>$PGLOG 2>&1
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echo "ok"
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;;
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reload)
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echo -n "Reload PostgreSQL: "
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su - $PGUSER -c "$PGCTL reload -D '$PGDATA' -s"
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echo "ok"
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;;
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status)
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su - $PGUSER -c "$PGCTL status -D '$PGDATA'"
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;;
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*)
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# Print help
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echo "Usage: $0 {start|stop|restart|reload|status}" 1>&2
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exit 1
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;;
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esac
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exit 0
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