我在CentOS服务器上安装了memcache，并在php中安装了相应的库：

尽pipe安装了他们两个，我结束了使用Memcache

$memcache = new Memcache; 

由于我想在重启服务器之后自动运行memcache服务，我这样做了：

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 memcached -d -u nobody -m 512 -p 11211 127.0.0.1 chkconfig memcached on 

然后我检查：

 chkconfig --list | grep memcache > memcached 0:off 1:off 2:on 3:on 4:on 5:on 6:off 

使用几分钟后：

 echo stats | nc 127.0.0.1 11211 STAT pid 30412 STAT uptime 1616 STAT time 1424280050 STAT version 1.4.15 STAT libevent 1.4.13-stable STAT pointer_size 64 STAT rusage_user 0.053991 STAT rusage_system 0.152976 STAT curr_connections 42 STAT total_connections 144 STAT connection_structures 43 STAT reserved_fds 20 STAT cmd_get 639 STAT cmd_set 360 STAT cmd_flush 0 STAT cmd_touch 0 STAT get_hits 262 STAT get_misses 377 STAT delete_misses 0 STAT delete_hits 0 STAT incr_misses 0 STAT incr_hits 0 STAT decr_misses 0 STAT decr_hits 0 STAT cas_misses 0 STAT cas_hits 0 STAT cas_badval 0 STAT touch_hits 0 STAT touch_misses 0 STAT auth_cmds 0 STAT auth_errors 0 STAT bytes_read 147954 STAT bytes_written 455620 STAT limit_maxbytes 536870912 STAT accepting_conns 1 STAT listen_disabled_num 0 STAT threads 4 STAT conn_yields 0 STAT hash_power_level 16 STAT hash_bytes 524288 STAT hash_is_expanding 0 STAT bytes 138385 STAT curr_items 359 STAT total_items 360 STAT expired_unfetched 0 STAT evicted_unfetched 0 STAT evictions 0 STAT reclaimed 1 END 

一切运行良好几个星期。 之后，我决定检查服务状态，出于某种原因，memcache根本没有运行。 我不得不把它放回去（我在那几个星期的某个时候重启了服务器）：

 memcached -d -u nobody -m 512 -p 11211 127.0.0.1 

为什么重启后memcache不能自动启动？ 那不就是chkconfig memcached on的作用吗？ 为什么它可能停止工作？

 service memcached start 

 /usr/local/bin/memcached 

 #!/bin/sh echo Checking for memcached instance... result=$(pidof memcached) echo "$result" if [ -z "$result" ]; then echo memcached is not running. Attempt to start it... /usr/bin/memcached -u memcached -p 11211 -m 1024 -c 1024 -l localhost -d & else echo memcached is already running. Do nothing. fi echo End of script. 

 * * * * root /usr/local/bin/memcached