Memcached服务端自动启动
所以，要将其设为自动启动的服务也就困难了。
上网搜索了一下，结果，得到以下一些结果，做个记录：
1、最傻的做法
通常：启动Memcache的服务器端的命令为：
# /usr/local/bin/memcached -d -m 10 -u root -l 192.168.0.200 -p 12000 -c 256 -P /tmp/memcached.pid
-d选项是启动一个守护进程，
-m是分配给Memcache使用的内存数量，单位是MB，我这里是10MB，
-u是运行Memcache的用户，我这里是root，
-l是监听的服务器IP地址，如果有多个地址的话，我这里指定了服务器的IP地址192.168.0.200，
-p是设置Memcache监听的端口，我这里设置了12000，最好是1024以上的端口，
-c选项是最大运行的并发连接数，默认是1024，我这里设置了256，按照你服务器的负载量来设定，
-P是设置保存Memcache的pid文件，我这里是保存在 /tmp/memcached.pid，
想开机自动启动的话，只需在/etc/rc.d/rc.local中加入一行，上面命令
有人用以下命令：
/usr/local/memcached/bin/memcached -d -m 20 -p 11211 -u apache
上面有些东西可以参考一下：即，ip不指定时，默认是本机，用户，最好选择是：apache 或 deamon
这样，也就是属于哪个用户的服务，由哪个用户启动。
2、较正规的方法：
To add a service to chkconfig you will normally need a couple of special comments below the shebang of a shell script:
- #!/bin/sh
- # chkconfig: -
- # description: The memcached daemon is a network memory cache service.
- # processname: memcached
#!/bin/sh
# chkconfig: - 55 45
# description: The memcached daemon is a network memory cache service.
# processname: memcached
After adding the lines to /etc/init.d/memcached you can then issue
chkconfig --add memcached
There are of course additional run levels a process can start at so to check that you would issue
chkconfig --list | grep "memcached"
A common run level for memcached would be
chkconfig --level 345 memcached on
说明：chkconfig --add memcached 用来添加memcached服务
chkconfig --list | grep "memcached" 检查服务是否添加
还可以简写为这样：
chkconfig --list | grep mem
chkconfig --level 345 memcached on 设置运行级别。
建议：最好使用chkconfig --level 235 memcached on 这样的话与apache级别相同，即只要有apache，就有memcached
3、更复杂的做法，创建完美的启动脚本
网上找到以下两个脚本：
- #!/bin/sh
- #
- # memcached: MemCached Daemon
- #
- # chkconfig: -
- # description: MemCached Daemon
- #
- # Source function library.
- . /etc/rc.d/init.d/functions
- . /etc/sysconfig/network
- #[ ${NETWORKING} = "no" ] && exit
- #[ -r /etc/sysconfig/dund ] || exit
- #. /etc/sysconfig/dund
- #[ -z "$DUNDARGS" ] && exit
- start()
- {
- echo -n $"Starting memcached: "
- daemon $MEMCACHED -u daemon -d -m -l 127.0.0.1 -p
- echo
- }
- stop()
- {
- echo -n $"Shutting down memcached: "
- killproc memcached
- echo
- }
- MEMCACHED="/usr/local/memcached/bin/memcached"
- [ -f $MEMCACHED ] || exit
- # See how we were called.
- case "$1" in
- start)
- start
- ;;
- stop)
- stop
- ;;
- restart)
- stop
- sleep
- start
- ;;
- *)
- echo $"Usage: $0 {start|stop|restart}"
- exit
- esac
- exit
#!/bin/sh
#
# memcached: MemCached Daemon
#
# chkconfig: - 90 25
# description: MemCached Daemon
#
# Source function library.
. /etc/rc.d/init.d/functions
. /etc/sysconfig/network
#[ ${NETWORKING} = "no" ] && exit 0
#[ -r /etc/sysconfig/dund ] || exit 0
#. /etc/sysconfig/dund
#[ -z "$DUNDARGS" ] && exit 0
start()
{
echo -n $"Starting memcached: "
daemon $MEMCACHED -u daemon -d -m 1024 -l 127.0.0.1 -p 11211
echo
}
stop()
{
echo -n $"Shutting down memcached: "
killproc memcached
echo
}
MEMCACHED="/usr/local/memcached/bin/memcached"
[ -f $MEMCACHED ] || exit 1
# See how we were called.
case "$1" in
start)
start
;;
stop)
stop
;;
restart)
stop
sleep 3
start
;;
*)
echo $"Usage: $0 {start|stop|restart}"
exit 1
esac
exit 0
- #!/bin/sh
- #
- # memcached: MemCached Daemon
- #
- # chkconfig: -
- # description: MemCached Daemon
- #
- # Source function library.
- . /etc/rc.d/init.d/functions
- . /etc/sysconfig/network
- start()
- {
- echo -n $"Starting memcached: "
- daemon /usr/local/bin/memcached -u daemon -d -m -l 10.10.10.220 -p
- echo
- }
- stop()
- {
- echo -n $"Shutting down memcached: "
- killproc memcached
- echo
- }
- [ -f /usr/local/bin/memcached ] || exit
- # See how we were called.
- case "$1" in
- start)
- start
- ;;
- stop)
- stop
- ;;
- restart|reload)
- stop
- start
- ;;
- condrestart)
- stop
- start
- ;;
- *)
- echo $"Usage: $0 {start|stop|restart|reload|condrestart}"
- exit
- esac
- exit
#!/bin/sh
#
# memcached: MemCached Daemon
#
# chkconfig: - 90 25
# description: MemCached Daemon
#
# Source function library.
. /etc/rc.d/init.d/functions
. /etc/sysconfig/network start()
{
echo -n $"Starting memcached: "
daemon /usr/local/bin/memcached -u daemon -d -m 4096 -l 10.10.10.220 -p 58728
echo
} stop()
{
echo -n $"Shutting down memcached: "
killproc memcached
echo
} [ -f /usr/local/bin/memcached ] || exit 0 # See how we were called.
case "$1" in
start)
start
;;
stop)
stop
;;
restart|reload)
stop
start
;;
condrestart)
stop
start
;;
*)
echo $"Usage: $0 {start|stop|restart|reload|condrestart}"
exit 1
esac
exit 0
在上述指定目录创建了上述某一个脚本以后，就可以进行以下操作：
[root@crm ~]# chkconfig --add memcached
[root@crm ~]# chkconfig --level 235 memcached on
[root@crm ~]# chkconfig --list | grep mem
memcached 0:off 1:off 2:on 3:on 4:off 5:on 6:off
接下来，可以用以下命令启动与停止 memcached
/etc/rc.d/init.d/memcached start
/etc/rc.d/init.d/memcached stop
/etc/rc.d/init.d/memcached restart
如：
[root@crm ~]# /etc/rc.d/init.d/memcached restart
Shutting down memcached: [ OK ]
Starting memcached: [ OK ]
同时，还可以用：
service memcached start
这样的命令操作
然后，可以用ps命令查看进程信息。
[root@crm ~]# ps aux | grep mem
daemon 23781 0.0 0.2 13892 9860 ? Ss 16:51:00 /.../memcached -u daemon -d -m 1024 -l 172.16.0.106 -p 11211
以上两个脚本前一个脚本中，对网络进行检查。其它都是针对服务启动与停止的命令提示设置。
有人说，复杂的脚本并不好懂，自己也不会写，却想要更完善的，怎么办？
那就到网上找高手的。最好的捷径就是到对应的RPM包中去找。（如果直接用RPM包安装，这些事情都不用做了）
当然，memcached多数情况下都是编译安装，因为，很多时候都是找不到对应的版本。
脚本中 # chkconfig: - 55 45 运行级别这一列参数用的是 -，这样，是不在脚本中写死，可以通过 chkconfig --level 235 memcached on 灵活设置。
最后就是，目前仍不了解
. /etc/sysconfig/network
#[ ${NETWORKING} = "no" ] && exit 0
#[ -r /etc/sysconfig/dund ] || exit 0
#. /etc/sysconfig/dund
#[ -z "$DUNDARGS" ] && exit 0
这一段的详细含义。需要进一步学习！