好的，我将 /etc/init.d/skeleton 复制到 /etc/init.d/ark-server 以启动和停止 ARK: Survival Evolved 服务器，我有以下文件：
#! /bin/sh
### BEGIN INIT INFO
# Provides: skeleton
# Required-Start: $remote_fs $syslog
# Required-Stop: $remote_fs $syslog
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Example initscript
# Description: This file should be used to construct scripts to be
# placed in /etc/init.d.
### END INIT INFO
# Author: Foo Bar <foobar@baz.org>
#
# Please remove the "Author" lines above and replace them
# with your own name if you copy and modify this script.
# Do NOT "set -e"
# PATH should only include /usr/* if it runs after the mountnfs.sh script
PATH=<path_to_ark>/ShooterGame/Binaries/Linux:/sbin:/usr/sbin:/bin:/usr/bin
DESC="ARK Dedicated Server"
NAME=ShooterGameServer
DAEMON=<path_to_ark>/ShooterGame/Binaries/Linux/$NAME
DAEMON_ARGS="\"TheIsland?listen?MultiHome=<ip>?QueryPort=<port>?ServerAdminPassword=<password>\" -nosteamclient -game -server -log"
PIDFILE=/var/run/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME
# Exit if the package is not installed
[ -x "$DAEMON" ] || exit 0
# Read configuration variable file if it is present
[ -r /etc/default/$NAME ] && . /etc/default/$NAME
# Load the VERBOSE setting and other rcS variables
. /lib/init/vars.sh
# Define LSB log_* functions.
# Depend on lsb-base (>= 3.2-14) to ensure that this file is present
# and status_of_proc is working.
. /lib/lsb/init-functions
#
# 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 --background --pidfile $PIDFILE --make-pidfile --chuid 1000:1000 --exec $DAEMON --test > /dev/null 2>&1 \
|| return 1
start-stop-daemon --start --quiet --background --pidfile $PIDFILE --make-pidfile --chuid 1000:1000 --exec $DAEMON -- \
$DAEMON_ARGS \
|| 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.
#return 0
}
#
# 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/INT/15/KILL/5 --pidfile $PIDFILE --chuid 1000:1000 --exec $DAEMON
RETVAL="$?"
[ "$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=0/30/KILL/5 --exec $DAEMON
##[ "$?" = 2 ] && return 2
# Many daemons don't delete their pidfiles when they exit.
rm -f $PIDFILE
return "$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 --signal 1 --quiet --pidfile $PIDFILE --name $NAME &
return 0
}
case "$1" in
start)
[ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
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 $DESC" "$NAME"
do_stop
case "$?" in
0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
esac
;;
status)
status_of_proc "$DAEMON" "$NAME" && exit 0 || exit $?
;;
#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 $DESC" "$NAME"
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
;;
*)
#echo "Usage: $SCRIPTNAME {start|stop|restart|reload|force-reload}" >&2
echo "Usage: $SCRIPTNAME {start|stop|status|restart|force-reload}" >&2
exit 3
;;
esac
这是我的 cron 条目：
0 12,3 * * 1-5 /etc/init.d/ark-server restart
0 6 * * 0,6 /etc/init.d/ark-server restart
如果我手动重新启动服务器，它总是会结束当前进程并创建一个新进程。但是，当 cronjobs 运行时，它会执行以下操作：
top - 18:47:08 up 60 days, 20:39, 2 users, load average: 3.43, 3.36, 3.39
Tasks: 215 total, 4 running, 211 sleeping, 0 stopped, 0 zombie
Cpu(s): 15.7%us, 31.6%sy, 0.0%ni, 49.3%id, 3.4%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 24397548k total, 23295208k used, 1102340k free, 36332k buffers
Swap: 7996348k total, 192228k used, 7804120k free, 7754660k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
31329 ark 20 0 2927m 1.9g 27m R 143 8.3 0:14.45 ShooterGameServ
28672 ark 20 0 4349m 3.9g 31m R 100 16.8 948:52.64 ShooterGameServ
19470 ark 20 0 4343m 3.9g 29m R 92 16.7 2388:36 ShooterGameServ
14218 ark 20 0 5211m 4.0g 18m S 24 17.2 2975:16 ShooterGameServ
如何阻止我的脚本在 cronjobs 中创建多个实例？
这就是我在日志文件中的全部内容：
$ cat Logs/ShooterGame_2-backup-2015.11.21-01.10.20.log
[2015.11.20-17.09.30:075][ 0]Log file open, 11/20/15 11:09:30
[2015.11.20-17.09.30:075][ 0]Primal Game Data Took 15.39 seconds
ShooterGame.log和都是ShooterGame_2.log空的。
所以我注意到的是，如果服务器运行超过 12 小时，重启只会失败并创建一个新的服务器实例。这是我今天重新启动服务器时发生的情况：
$ cat /var/run/ShooterGameServer.pid
16330
$ sudo /etc/init.d/ark-server restart
* Restarting ARK Dedicated Server ShooterGameServer [ OK ]
$ cat /var/run/ShooterGameServer.pid
21094
$ kill -9 16330
$ kill -9 21094
它使用 PID 21094 启动了第二个进程，而没有结束 PID 16330 的进程。但是，如果我杀死这两个进程并使用相同的脚本重新启动服务器，它总是先关闭第一个进程。