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@erans
Created June 28, 2011 19:04
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Twitter’s Kestrel init script for Ubuntu 10.04 Lucid
#!/bin/sh
#
# kestrel init.d script.
#
# All java services require the same directory structure:
# /usr/local/$APP_NAME
# /var/log/$APP_NAME
# /var/run/$APP_NAME
APP_NAME="kestrel"
VERSION="2.0.0-SNAPSHOT"
APP_HOME="/usr/local/$APP_NAME/current"
DAEMON="/usr/local/bin/daemon"
JAR_NAME="$APP_NAME-$VERSION.jar"
STAGE="production"
JAVA_HOME="/usr/lib/jvm/java-6-openjdk/jre/"
HEAP_OPTS="-Xmx512m -Xms512m -XX:NewSize=256m"
JMX_OPTS="-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=22134 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false"
GC_OPTS="-verbosegc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCDateStamps -XX:+UseConcMarkSweepGC -XX:+UseParNewGC"
GC_LOG="-Xloggc:/var/log/$APP_NAME/gc.log"
DEBUG_OPTS="-XX:ErrorFile=/var/log/$APP_NAME/java_error%p.log"
JAVA_OPTS="-server -Dstage=$STAGE $GC_OPTS $GC_LOG $HEAP_OPTS $JMX_OPTS $DEBUG_OPTS"
pidfile="/var/run/$APP_NAME/$APP_NAME.pid"
daemon_pidfile="/var/run/$APP_NAME/$APP_NAME-daemon.pid"
daemon_args="--name $APP_NAME --pidfile $daemon_pidfile --core --chdir /"
daemon_start_args="--stdout=/var/log/$APP_NAME/stdout --stderr=/var/log/$APP_NAME/error"
running() {
$DAEMON $daemon_args --running
}
find_java() {
if [ ! -z "$JAVA_HOME" ]; then
return
fi
for dir in /opt/jdk /System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK/Home /usr/java/default; do
if [ -x $dir/bin/java ]; then
JAVA_HOME=$dir
break
fi
done
}
find_java
case "$1" in
start)
echo -n "Starting $APP_NAME... "
if [ ! -r $APP_HOME/$JAR_NAME ]; then
echo "FAIL"
echo "*** $APP_NAME jar missing: $APP_HOME/$JAR_NAME - not starting"
exit 1
fi
if [ ! -x $JAVA_HOME/bin/java ]; then
echo "FAIL"
echo "*** $JAVA_HOME/bin/java doesn't exist -- check JAVA_HOME?"
exit 1
fi
if running; then
echo "already running."
exit 0
fi
ulimit -n 32768 || echo -n " (no ulimit)"
ulimit -c unlimited || echo -n " (no coredump)"
$DAEMON $daemon_args $daemon_start_args -- sh -c "echo "'$$'" > $pidfile; exec ${JAVA_HOME}/bin/java ${JAVA_OPTS} -jar ${APP_HOME}/${JAR_NAME}"
tries=0
while ! running; do
tries=$((tries + 1))
if [ $tries -ge 5 ]; then
echo "FAIL"
exit 1
fi
sleep 1
done
echo "done."
;;
stop)
echo -n "Stopping $APP_NAME... "
if ! running; then
echo "wasn't running."
exit 0
fi
(echo "shutdown"; sleep 2) | telnet localhost 22133 >/dev/null 2>&1
tries=0
while running; do
tries=$((tries + 1))
if [ $tries -ge 15 ]; then
echo "FAILED SOFT SHUTDOWN, TRYING HARDER"
if [ -f $pidfile ]; then
kill $(cat $pidfile)
else
echo "CAN'T FIND PID, TRY KILL MANUALLY"
exit 1
fi
hardtries=0
while running; do
hardtries=$((hardtries + 1))
if [ $hardtries -ge 5 ]; then
echo "FAILED HARD SHUTDOWN, TRY KILL -9 MANUALLY"
kill -9 $(cat $pidfile)
fi
sleep 1
done
fi
sleep 1
done
echo "done."
;;
status)
if running; then
echo "$APP_NAME is running."
else
echo "$APP_NAME is NOT running."
fi
;;
restart)
$0 stop
sleep 2
$0 start
;;
*)
echo "Usage: /etc/init.d/${APP_NAME}.sh {start|stop|restart|status}"
exit 1
;;
esac
exit 0
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