手动清除memcached缓存

软件版本

memcached-1.4.5
memcache-3.0.5
php-5.2.11

1、查 memcache 状态

/usr/bin/perl /usr/local/src/memcached-1.4.5/scripts/memcached-tool localhost:11211

或者

telnet localhost 11211

2、手动清除 memcached 测试

1) flush_all

echo "flush_all" | nc localhost 11211

或者直接 telnet 到服务端

# telnet localhost 11211
Trying 127.0.0.1...
Connected to localhost.localdomain (127.0.0.1).
Escape character is '^]'.
get var_key
VALUE var_key 0 13
test variable
END
flush_all
OK
get var_key
END
quit
Connection closed by foreign host.

2) 重启 memcached 进程

kill $(ps aux|grep memcached|grep -v grep |awk '{print $2}')

/usr/local/memcached/bin/memcached -d -m 256 -p 11211 -u nobody

3) 测试

Memcache::flush() immediately invalidates all existing items.

/* procedural API */
$memcache_obj = memcache_connect('memcache_host', 11211);
memcache_flush($memcache_obj);
/* OO API */
$memcache_obj = new Memcache;
$memcache_obj->connect('memcache_host', 11211);
$memcache_obj->flush();
?>

这个测试的表现是请求 Memcache::flush() 以后仍可以 get $key 取到值，而且通过 memcached-tool  查到该 item 的 max_age 并无变化。