CentOS下PHP安裝memcache擴展問(wèn)題的解決方法

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系統版本是5.2，把安裝memcached的方法記錄下先：

代碼如下:

cd ~/memcached
wget -c http://www.monkey.org/~provos/libevent-1.4.10-stable.tar.gz
wget -c http://memcached.googlecode.com/files/memcached-1.2.8.tar.gz
#安裝libevent
tar -zxvf libevent-1.4.10-stable.tar.gz
cd libevent-1.4.10-stable
./configure
make
make install
#安裝memcached
cd ..
tar -zxvf memcached-1.2.8.tar.gz
cd memcached-1.2.8
./configure
make
make install
#如果是64位系統，還需要把libevent的文件復制到/wp-content/lib64/下，用來(lái)解決error while loading shared libraries的問(wèn)題
cp -R /wp-content/local/lib/libevent* /wp-content/lib64/

好了，開(kāi)始安裝php的擴展，惡夢(mèng)開(kāi)始了，本以為直接用yum來(lái)安裝php-devel.x86_64和php-pecl-memcache.x86_64這兩個(gè)擴展就可以了，可裝了后 phpinfo()里根本找不到memcache擴展，把已經(jīng)裝的這兩個(gè)擴展remove重來(lái)，還是不行，goooooooooooooogle，找到了一篇文章《PHP Pecl Memcached module installation problems》，有救嘍，先remove掉php-pecl-memcache.x86_64，然后執行了

pecl install memcache

順利安裝上了，打開(kāi)/etc/php.d/看了下，沒(méi)有memcache.ini，好吧，手動(dòng)到/etc/php.ini加上了 extension=memcache.so，好了，重啟httpd，刷新 phpinfo() ，竟然還沒(méi)有，我郁悶了。。

回頭想想，我好像漏了一個(gè)地方?jīng)]有檢查，馬上打開(kāi) /wp-content/lib64/php/modules/ 查看，果然沒(méi)有memcache.so，會(huì )在哪呢？ find -name之，原來(lái)躲在 /wp-content/local/lib/php/extensions/no-debug-non-zts-20060613/ 下，復制到 /wp-content/lib64/php/modules/ 再試，久違的 memcache擴展出現了。 T T

Memcached參數說(shuō)明：

• -d選項是啟動(dòng)一個(gè)守護進(jìn)程

• -m分配給Memcache使用的內存數量，單位是MB

• -u運行Memcache的用戶(hù)

• -l監聽(tīng)的IP地址

• -p設置Memcache監聽(tīng)的端口,最好是1024以上的端口

• -c最大運行的并發(fā)連接數，默認是1024，按照你服務(wù)器的負載量來(lái)設定

• -P設置保存Memcache的pid文件

啟動(dòng)：

memcached -d -u root -m 128 -c 8192

查看狀態(tài)：

watch “echo stats | nc 127.0.0.1 11211″

狀態(tài)說(shuō)明：

• uptime：memcached運行的秒數

• cmd_get：查詢(xún)緩存的次數。這兩個(gè)數據相除一下就能得到平均每秒請求緩存的次數

• 
  

• cmd_set：設置key=>value的次數

• get_hits：緩存命中的次數。緩存命中率 = get_hits/cmd_get * 100%

• scurr_items：現在在緩存中的鍵值對個(gè)數

相關(guān)網(wǎng)址：

Libevent：http://www.monkey.org/~provos/libevent/
Memcached：http://danga.com/memcached/
PHP Memcached Extension：http://pecl.php.net/package/memcache

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[shell]
[root@~]# pecl install memcache
downloading memcache-2.2.6.tgz ...
Starting to download memcache-2.2.6.tgz (35,957 bytes)
..........done: 35,957 bytes
11 source files, building
WARNING: php_bin /opt/php/bin/php appears to have a suffix /bin/php, but config variable php_suffix does not match
running: phpize
Configuring for:
PHP Api Version: 20090626
Zend Module Api No: 20090626
Zend Extension Api No: 220090626
Enable memcache session handler support? [yes] : n
[/shell]

[shell]
running: make INSTALL_ROOT="/var/tmp/pear-build-root/install-memcache-2.2.6" install
Installing shared extensions: /var/tmp/pear-build-root/install-memcache-2.2.6/opt/php/lib/php/extensions/no-debug-non-zts-20090626/
running: find "/var/tmp/pear-build-root/install-memcache-2.2.6" | xargs ls -dils
11370548 4 drwxr-xr-x 3 root root 4096 Jan 6 15:55 /var/tmp/pear-build-root/install-memcache-2.2.6
11370602 4 drwxr-xr-x 3 root root 4096 Jan 6 15:55 /var/tmp/pear-build-root/install-memcache-2.2.6/opt
11370603 4 drwxr-xr-x 3 root root 4096 Jan 6 15:55 /var/tmp/pear-build-root/install-memcache-2.2.6/opt/php
11370604 4 drwxr-xr-x 3 root root 4096 Jan 6 15:55 /var/tmp/pear-build-root/install-memcache-2.2.6/opt/php/lib
11370605 4 drwxr-xr-x 3 root root 4096 Jan 6 15:55 /var/tmp/pear-build-root/install-memcache-2.2.6/opt/php/lib/php
11370606 4 drwxr-xr-x 3 root root 4096 Jan 6 15:55 /var/tmp/pear-build-root/install-memcache-2.2.6/opt/php/lib/php/extensions
11370607 4 drwxr-xr-x 2 root root 4096 Jan 6 15:55 /var/tmp/pear-build-root/install-memcache-2.2.6/opt/php/lib/php/extensions/no-debug-non-zts-20090626
11370601 236 -rwxr-xr-x 1 root root 235639 Jan 6 15:55 /var/tmp/pear-build-root/install-memcache-2.2.6/opt/php/lib/php/extensions/no-debug-non-zts-20090626/memcache.so

Build process completed successfully
Installing '/opt/php/lib/php/extensions/no-debug-non-zts-20090626/memcache.so'
install ok: channel://pecl.php.net/memcache-2.2.6
configuration option "php_ini" is not set to php.ini location
You should add "extension=memcache.so" to php.ini
[/shell]