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Linux之系统服务----自己创建服务

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怀抱观古今，寝食展戏谑。这篇文章主要讲述Linux之系统服务----自己创建服务相关的知识，希望能为你提供帮助。
【Linux之系统服务----自己创建服务】前几天比较忙，今天才闲下来，接着上次的内容讲，今天主要给大家讲讲service类型的配置文件，说的简单一些就是如何自己创建一个自己想要的服务。
一、了解service的参数信息
要想自己创建一个服务可不是一蹴而就的，最好的办法就是想去学习一下系统中已有的服务是什么样的，是以什么方式运行的，只有知己知彼才能百战不殆。先来看看sshd这个服务。

然后呢分析一下其中的内容，首先【UNIT】代表的是下面一段内容是对该UNIT本身的说明介绍，我这里的系统中关于这段的介绍共有四点 ，实际上是有很多的，我在网上找到了关于这个参数的简介：
接下来再了解一下【service】中有哪些参数


最后咱们要说的就是【install】install部分

二、创建自己的服务
上面已经学习了一些service类型的配置文件的内容，然后我们创建一个可以备份自己系统的服务来耍耍，哈哈哈
在／usr/lib/systemd/system下创建nginx.service文件内容如下（看应用需求也可以在 ／usr/lib/systemd/usr下创建）：
输入以下命令：
1)创建nginx脚本

#!/bin/sh

### BEGIN INIT INFO
# Provides:nginx
# Required-Start:$local_fs $remote_fs $network $syslog $named
# Required-Stop:$local_fs $remote_fs $network $syslog $named
# Default-Start:2 3 4 5
# Default-Stop:0 1 6
# Short-Description: starts the nginx web server
# Description:starts nginx using start-stop-daemon
### END INIT INFO

PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
DAEMON=/usr/sbin/nginx
NAME=nginx
DESC=nginx

# Include nginx defaults if available
if [ -r /etc/default/nginx ]; then
. /etc/default/nginx
fi

test -x $DAEMON || exit 0

. /lib/init/vars.sh
. /lib/lsb/init-functions

# Try to extract nginx pidfile
PID=$(cat /etc/nginx/nginx.conf | grep -Ev ^\\s*# | awk BEGINRS="[; ]"if ($1 == "pid") print $2| head -n1)
if [ -z "$PID" ]
then
PID=/run/nginx.pid
fi

# Check if the ULIMIT is set in /etc/default/nginx
if [ -n "$ULIMIT" ]; then
# Set the ulimits
ulimit $ULIMIT
fi

#
# 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 $PID --exec $DAEMON --test > /dev/null \\
|| return 1
start-stop-daemon --start --quiet --pidfile $PID --exec $DAEMON -- \\
$DAEMON_OPTS 2> /dev/null \\
|| return 2


test_nginx_config()
$DAEMON -t $DAEMON_OPTS > /dev/null 2> & 1


#
# 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 $PID --name $NAME
RETVAL="$?"

sleep 1
return "$RETVAL"


#
# Function that sends a SIGHUP to the daemon/service
#
do_reload()
start-stop-daemon --stop --signal HUP --quiet --pidfile $PID --name $NAME
return 0


#
# Rotate log files
#
do_rotate()
start-stop-daemon --stop --signal USR1 --quiet --pidfile $PID --name $NAME
return 0


#
# Online upgrade nginx executable
#
# "Upgrading Executable on the Fly"
# http://nginx.org/en/docs/control.html
#
do_upgrade()
# Return
#0 if nginx has been successfully upgraded
#1 if nginx is not running
#2 if the pid files were not created on time
#3 if the old master could not be killed
if start-stop-daemon --stop --signal USR2 --quiet --pidfile $PID --name $NAME; then
# Wait for both old and new master to write their pid file
while [ ! -s "$PID.oldbin" ] || [ ! -s "$PID" ]; do
cnt=`expr $cnt + 1`
if [ $cnt -gt 10 ]; then
return 2
fi
sleep 1
done
# Everything is ready, gracefully stop the old master
if start-stop-daemon --stop --signal QUIT --quiet --pidfile "$PID.oldbin" --name $NAME; then
return 0
else
return 3
fi
else
return 1
fi


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
; ;
restart)
log_daemon_msg "Restarting $DESC" "$NAME"

# Check configuration before stopping nginx
if ! test_nginx_config; then
log_end_msg 1 # Configuration error
exit 0
fi

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
; ;
reload|force-reload)
log_daemon_msg "Reloading $DESC configuration" "$NAME"

# Check configuration before reload nginx
#
# This is not entirely correct since the on-disk nginx binary
# may differ from the in-memory one, but thats not common.
# We prefer to check the configuration and return an error
# to the administrator.
if ! test_nginx_config; then
log_end_msg 1 # Configuration error
exit 0
fi

do_reload
log_end_msg $?
; ;
configtest|testconfig)
log_daemon_msg "Testing $DESC configuration"
test_nginx_config
log_end_msg $?
; ;
status)
status_of_proc -p $PID

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