手動清除memcached緩存

軟件版本

memcached-1.4.5
memcache-3.0.5
php-5.2.11

 

一、查 memcache 狀態

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

或者

telnet localhost 11211

 

二、手動清除 memcached 測試

1) flush_all

echo "flush_all" | nc localhost 11211

或者直接 telnet 到服務端

# 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) 重啓 memcached 進程

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

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

 

3) 測試

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();
?>

這個測試的表現是請求 Memcache::flush() 之後仍能夠 get $key 取到值，並且經過 memcached-tool  查到該 item 的 max_age 並沒有變化。