Daemon init script for node.js based app/server (DEBIAN/UBUNTU)
- !/bin/sh
# ------------------------------------------------------------------------------ # SOME INFOS : fairly standard (debian) init script. # Note that node doesn't create a PID file (hence --make-pidfile) # has to be run in the background (hence --background) # and NOT as root (hence --chuid) # # MORE INFOS : INIT SCRIPT http://www.debian.org/doc/debian-policy/ch-opersys.html#s-sysvinit # INIT-INFO RULES http://wiki.debian.org/LSBInitScripts # INSTALL/REMOVE http://www.debian-administration.org/articles/28 # ------------------------------------------------------------------------------ # # # BEGIN <MODIFY TO REFLECT YOUR SETTINGS> # # # # # 1) Don't forget to also modify the COMMENTED fields in the "### BEGIN INIT INFO" # below (don't uncomment them) if you wish to install system-wide with update-rc.d # eg: provides, Short-Description, Description # # 2) in case you have different node.js servers running, each init.d script should # (obviously) have a UNIQUE BASE name so that PIDS do not conflict # --> name them accordingly # eg: node_static_server, node_express1, node_load_balancer.sh... # # 3) copy the renamed/modified script(s) to /etc/init.d # chmod 755, # # 4) if you wish the Daemon to be lauched at boot / stopped at shutdown : # INSTALL : update-rc.d scriptname defaults # (UNINSTALL : update-rc.d -f scriptname remove) # # 5) based on : Debian /etc/init.d/skeleton # modified by : Peter Host (www.oghme.com) # ______________________________________________________________________________ ### BEGIN INIT INFO # Provides: node_debian_init # Required-Start: $remote_fs $named $syslog # Required-Stop: $remote_fs $named $syslog # Default-Start: 2 3 4 5 # Default-Stop: 0 1 6 # Short-Description: DEBIAN initscript for node.js servers/apps # Description: ex : proxy server is a node.js http server listening on # port 8080 (relayed from 80 by iptables). It balances # http requests between the main nodejs server # (nodejs.mydomain.com:8000), the static file-server # (static.mydomain.com) and the legacy apache server # (apache.mydomain.com) and possibly other servers # place this file in /etc/init.d. ### END INIT INFO # Author: My Name <myname@domain.tld> # # Please remove the "Author" lines above and replace them # with your own name if you copy and modify this script. # ______________________________________________________________________________ # # PATH should only include /usr/* if it runs after the mountnfs.sh script PATH=/sbin:/usr/sbin:/bin:/usr/bin:/usr/local/bin # modify if you need DAEMON_ARGS="/path/to/app.js" # path to your node.js server/app
# NB: don't use ~/ in path
DESC="node.js http server" # whatever fancy description you like NODEUSER=myuser:mygroup # USER who OWNS the daemon process (no matter whoever runs the init script)
# user:group (if no group is specified, the primary GID for that user is used)
LOCAL_VAR_RUN=/usr/local/var/run # in case the init script is run by non-root user, you need to
# indicate a directory writeable by $NODEUSER to store the PID file # NB : 1) /usr/local/var/run does not exist by DEFAULT. Either create it # or choose one of your own liking. # 2) node, npm,... are best NOT installed/run as ROOT. # (see here: https://github.com/isaacs/npm/blob/master/README.md)
NAME=node # name of the node.js executable
DAEMON=/usr/local/bin/$NAME # this SHOULD POINT TO where your node executable is
#
# #
# END </MODIFY TO REFLECT YOUR SETTINGS> #
# (Nothing else to modify from this point on...) #
# ------------------------------------------------------------------------------
# Do NOT "set -e"
[ $UID -eq "0" ] && LOCAL_VAR_RUN=/var/run # in case this script is run by root, override user setting
THIS_ARG=$0
INIT_SCRIPT_NAME=`basename $THIS_ARG`
[ -h $THIS_ARG ] && INIT_SCRIPT_NAME=`basename $(readlink $THIS_ARG)` # in case of symlink
INIT_SCRIPT_NAME_NOEXT=${INIT_SCRIPT_NAME%.*}
PIDFILE="$LOCAL_VAR_RUN/$INIT_SCRIPT_NAME_NOEXT.pid"
SCRIPTNAME=/etc/init.d/$INIT_SCRIPT_NAME
# Exit if the package is not installed
[ -x "$DAEMON" ] || { echo "can't find Node.js ($DAEMON)" >&2; exit 0; }
# Exit if the 'run' folder is not present
[ -d "$LOCAL_VAR_RUN" ] || { echo "Directory $LOCAL_VAR_RUN does not exist. Modify the '$INIT_SCRIPT_NAME_NOEXT' init.d script ($THIS_ARG) accordingly" >&2; exit 0; }
# Read configuration variable file if it is present
[ -r /etc/default/$INIT_SCRIPT_NAME ] && . /etc/default/$INIT_SCRIPT_NAME
# Load the VERBOSE setting and other rcS variables
. /lib/init/vars.sh
# Define LSB log_* functions.
# Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
. /lib/lsb/init-functions
# uncomment to override system setting
# VERBOSE=yes
#
# Function that starts the daemon/service
#
do_start()
{
# Return # 0 if daemon has been started # 1 if daemon was already running # 2 if daemon could not be started start-stop-daemon --start --quiet --pidfile $PIDFILE --chuid $NODEUSER --background --exec $DAEMON --test > /dev/null \ || { [ "$VERBOSE" != no ] && log_daemon_msg " ---> Daemon already running $DESC" "$INIT_SCRIPT_NAME_NOEXT"; return 1; } start-stop-daemon --start --quiet --chuid $NODEUSER --make-pidfile --pidfile $PIDFILE --background --exec $DAEMON -- \ $DAEMON_ARGS \ || { [ "$VERBOSE" != no ] && log_daemon_msg " ---> could not be start $DESC" "$INIT_SCRIPT_NAME_NOEXT"; return 2; } # Add code here, if necessary, that waits for the process to be ready # to handle requests from services started subsequently which depend # on this one. As a last resort, sleep for some time. [ "$VERBOSE" != no ] && log_daemon_msg " ---> started $DESC" "$INIT_SCRIPT_NAME_NOEXT"
}
#
# Function that stops the daemon/service
#
do_stop()
{
# Return # 0 if daemon has been stopped # 1 if daemon was already stopped # 2 if daemon could not be stopped # other if a failure occurred start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile $PIDFILE --chuid $NODEUSER --name $DAEMON RETVAL="$?" #[ "$VERBOSE" != no ] && [ "$RETVAL" = 1 ] && log_daemon_msg " ---> SIGKILL failed => hardkill $DESC" "$INIT_SCRIPT_NAME_NOEXT" [ "$RETVAL" = 2 ] && return 2 # Wait for children to finish too if this is a daemon that forks # and if the daemon is only ever run from this initscript. # If the above conditions are not satisfied then add some other code # that waits for the process to drop all resources that could be # needed by services started subsequently. A last resort is to # sleep for some time. start-stop-daemon --stop --quiet --oknodo --retry=0/3/KILL/5 --pidfile $PIDFILE --chuid $NODEUSER --exec $DAEMON -- $DAEMON_ARGS [ "$?" = 2 ] && return 2 # Many daemons don't delete their pidfiles when they exit. rm -f $PIDFILE
[ "$VERBOSE" != no ] && [ "$RETVAL" = 1 ] && log_daemon_msg " ---> $DESC not running" "$INIT_SCRIPT_NAME_NOEXT" [ "$VERBOSE" != no -a "$RETVAL" = 0 ] && log_daemon_msg " ---> $DESC stopped" "$INIT_SCRIPT_NAME_NOEXT"
return "$RETVAL"
}
#
# Function that sends a SIGHUP to the daemon/service
#
do_reload() {
# # If the daemon can reload its configuration without # restarting (for example, when it is sent a SIGHUP), # then implement that here. # start-stop-daemon --stop --quiet --signal 1 --pidfile $PIDFILE --chuid $NODEUSER --name $NAME return 0
}
#
# Function that returns the daemon
#
do_status() {
#
# http://refspecs.freestandards.org/LSB_3.1.1/LSB-Core-generic/LSB-Core-generic/iniscrptact.html
# 0 program is running or service is OK
# 1 program is dead and /var/run pid file exists
# (2 program is dead and /var/lock lock file exists) (not used here)
# 3 program is not running
# 4 program or service status is unknown
RUNNING=$(running)
# $PIDFILE corresponds to a live $NAME process
ispidactive=$(pidof $NAME | grep `cat $PIDFILE 2>&1` >/dev/null 2>&1)
ISPIDACTIVE=$?
if [ -n "$RUNNING" ]; then
if [ $ISPIDACTIVE ]; then
log_success_msg "$INIT_SCRIPT_NAME_NOEXT (launched by $USER) (--chuid $NODEUSER) is running" exit 0
fi
else
if [ -f $PIDFILE ]; then
log_success_msg "$INIT_SCRIPT_NAME_NOEXT (launched by $USER) (--chuid $NODEUSER) is not running, phantom pidfile $PIDFILE" exit 1
else
log_success_msg "no instance launched by $USER, of $INIT_SCRIPT_NAME_NOEXT (--chuid $NODEUSER) found" exit 3
fi
fi
}
running() {
RUNSTAT=$(start-stop-daemon --start --quiet --pidfile $PIDFILE --chuid $NODEUSER --background --exec $DAEMON --test > /dev/null)
if [ "$?" = 1 ]; then
echo y
fi
}
case "$1" in
start)
[ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$INIT_SCRIPT_NAME_NOEXT" do_start case "$?" in 0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;; 2) [ "$VERBOSE" != no ] && log_end_msg 1 ;; esac ;;
stop)
[ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$INIT_SCRIPT_NAME_NOEXT" do_stop case "$?" in 0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;; 2) [ "$VERBOSE" != no ] && log_end_msg 1 ;; esac ;;
#reload|force-reload)
# # If do_reload() is not implemented then leave this commented out # and leave 'force-reload' as an alias for 'restart'. # #log_daemon_msg "Reloading $DESC" "$NAME" #do_reload #log_end_msg $? #;;
restart|force-reload)
# # If the "reload" option is implemented then remove the # 'force-reload' alias # log_daemon_msg "Restarting $DESC" "$INIT_SCRIPT_NAME_NOEXT" do_stop case "$?" in 0|1) do_start case "$?" in 0) log_end_msg 0 ;; 1) log_end_msg 1 ;; # Old process is still running *) log_end_msg 1 ;; # Failed to start esac ;; *) # Failed to stop log_end_msg 1 ;; esac ;;
status)
do_status
;;
*)
#echo "Usage: $SCRIPTNAME {start|stop|restart|reload|force-reload}" >&2 echo "Usage: $SCRIPTNAME {start|stop|restart|force-reload}" >&2 exit 3 ;;
esac exit 0
