Managing Jenkins as a service and starting at boot time

case “$1″ in
start)
start
;;
stop)
stop
;;
restart)
restart
;;
*)

stop_jenkins() {
echo “Stopping Jenkins services…”
su – jenkins -c “sh $shutdwn”
}

status_jenkins() {
# Check for any other process containing jenkins.war
# This could be improved upon (see script below)
numproc=`ps -ef | grep [j]enkins.war | wc -l`
if [ $numproc -ne 0 ]; then
echo “Jenkins is running…”
else
echo “Jenkins is NOT running…”
fi
}

case “$1” in
start)
start_jenkins
;;
stop)
stop_jenkins
;;
status)
status_jenkins
;;
restart)
stop_jenkins
start_jenkins
;;
*)
echo “Usage: $0 {start|stop|status|restart}”
exit 1
esac
exit 0

service jenkins stop

service jenkins start

cleanup(){
# Perform any clean-up activities here…
[ “${EXIT_STRING}” != “0” ] && echo `date “+%d/%m/%y %H:%M:%S”` ${EXIT_STRING}
exit 0
}

trap ” QUIT

_error() {
EXIT_STRING=”${1}”
[ “${1}” != “0” ] && EXIT_STRING=”ERROR: ${1}, please investigate, terminating.”
cleanup  # Never returns from this call…
}

say(){
echo `date “+%d/%m/%y %H:%M:%S”` “${1}”
}

saybold(){
tput bold 2>/dev/null
echo `date “+%d/%m/%y %H:%M:%S”` “${1}”
tput sgr0 2>/dev/null
}

check_folders(){
say “”
saybold “Checking all required folders exist…”
for REQUIRED_DIR in ${JENKINS_ROOT} ${JENKINS_HOME} ${JAVA_HOME}
do
[ ! -d “${REQUIRED_DIR}” ] && _error “Necessary directory: ${REQUIRED_DIR} does not exist”
say “Found required directory: ${REQUIRED_DIR}”
done
saybold “Done.”
say “”
}

check_files(){
say “”
saybold “Checking all required files exist…”
for REQUIRED_FILE in ${JENKINS_WAR} ${NC} ${WGET} ${JAVA} ${LSOF} ${FUSER} ${GREP} ${AWK}
do
[ ! -f “${REQUIRED_FILE}” ] && _error “Necessary file: ${REQUIRED_file} does not exist”
say “Found required file ${REQUIRED_FILE}”
done
saybold “Done.”
say “”
}

check_port_closed(){
say “Checking that port ${HTTP_PORT} is closed…”
${NC} -w 1 localhost ${HTTP_PORT}
if [ $? -eq 0 ]; then
_error “Required Jenkins port ${HTTP_PORT} is already in use”
else
say “Ok, required port ${HTTP_PORT} is available, continuing…”
fi
}

check_port_open(){
say “Checking that port ${HTTP_PORT} is open…”
${NC} -w 1 localhost ${HTTP_PORT}
if [ $? -eq 0 ]; then
say “Ok, a process is listening on port ${HTTP_PORT}, continuing…”
else
_error “Required Jenkins port ${HTTP_PORT} has not been opened.”
fi
}

start_process(){
cd ${JENKINS_HOME}
saybold “Starting Process now…”
${NOHUP} ${JAVA} -jar ${JENKINS_WAR} -D${MARKER} –httpListenAddress=0.0.0.0 –httpPort=${HTTP_PORT} > ${LOG_FILE} &
say “Process initiated.”
}

check_log(){
say “Checking the log file ${LOG_FILE} for an HTTP listener…”
STARTED=`${GREP} -c “HTTP Listener started” ${LOG_FILE}`
if [ ${STARTED} -eq “0” ]; then
_error “An HTTP Listener has not reported as started in the log file ${LOG_FILE}”
else
saybold “An HTTP Listener is reported as started in the log file ${LOG_FILE}”
fi
}

check_html(){
# These checks need error handling, but you get the general idea.
say “Checking that localhost:${HTTP_PORT} is serving Jenkins pages…”
TEMP_WGETDIR=tempwgetdir$$
mkdir ${TEMP_WGETDIR}
cd ${TEMP_WGETDIR}
${WGET} -q http://localhost:${HTTP_PORT}
GOT_HTML=`${GREP} -c Dashboard index.html`
cd ${JENKINS_HOME}
rm -rf ${TEMP_WGETDIR}
if [ ${GOT_HTML} -eq “0” ]; then
_error “Unable to get an HTML page from the Server.”
fi
saybold “Recieved valid HTML from the server, all looks ok.”
}

check_process(){
check_port_open
check_log
check_html
say “A Jenkins instance is listening on port ${HTTP_PORT} for project ${PROJECT}.”
say “The process is logging debug info to the log file: ${LOG_FILE}”
}

stop_proc(){
check_port_open
saybold “Looking for the Process ID attached to port ${HTTP_PORT}”
PID=`${LSOF} -w -n -i tcp:${HTTP_PORT} | ${GREP} -v COMMAND | ${AWK} {‘print $2’}`
if [ “${PID}” == “” ]; then
saybold “Unable to detect the Process ID that is listening on port ${HTTP_PORT}!”
PID=`${FUSER} ${LOG_FILE}`
if [ “${PID}” == “” ]; then
_error “Unable to find the PID that has the log file open too!”
else
say “Ok, found PID ${PID}”
fi
else
saybold “Found a PID of $PID, killing it now…”
fi
kill -9 ${PID}
say “Waiting ${WAIT_TIME} seconds for the process to die…”
sleep ${WAIT_TIME}
saybold “Done, checking port is closed…”
check_port_closed
saybold “All done.”
}

start(){
check_folders
check_files
check_port_closed
start_process
saybold “Waiting ${START_WAIT_TIME} seconds for the process to start up…”
sleep ${START_WAIT_TIME}
check_process
}

restart(){
stop_proc
start
}

#################################################################################
### Script Start ################################################################
#################################################################################

case “$1” in
start)
start
;;
stop)
stop_proc
;;
restart)
restart
;;
check)
check_process
;;
*)
echo “Usage: $0 {start|stop|restart|check}”
esac
# Exit cleanly
_error “0”