Twitter’s Kestrel init script for Ubuntu 10.04 Lucid
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#!/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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