memcached 安装问题解答
操作环境：CentOS 5.4
安装详细请见：http://blog.csdn.net/yima1006/article/details/9263409
如果你所使用的RedHat Linux 或者是CentOS ，当你直接通过yum安装memcached时会出现以下问题：
[root@h3 ~]# yum install memcached Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * addons: mirrors.163.com * base: mirrors.163.com * extras: mirrors.163.com * updates: mirrors.163.com Setting up Install Process No package memcached available. Nothing to do [root@h3 ~]#
解决办法：
第一步，升级（或者重新安装yum），运行命令：
[root@h3 ~]# yum update yum Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * addons: mirror.esocc.com * base: mirror.esocc.com * extras: mirror.esocc.com * updates: mirror.esocc.com Setting up Update Process Resolving Dependencies --> Running transaction check ---> Package yum.noarch 0:3.2.22-40.el5.centos set to be updated --> Finished Dependency Resolution Dependencies Resolved ================================================================================ Package Arch Version Repository Size ================================================================================ Updating: yum noarch 3.2.22-40.el5.centos base 1.0 M Transaction Summary ================================================================================ Install 0 Package(s) Upgrade 1 Package(s) Total download size: 1.0 M Is this ok [y/N]: y Downloading Packages: yum-3.2.22-40.el5.centos.noarch.rpm | 1.0 MB 00:08 Running rpm_check_debug Running Transaction Test Finished Transaction Test Transaction Test Succeeded Running Transaction Updating : yum 1/2 Cleanup : yum 2/2 Updated: yum.noarch 0:3.2.22-40.el5.centos Complete!
当然，有些朋友直接yum update 命令，这样需要好几个小时，据我的理解，其实只需要升级一下yum就行了。
第二步，yum makecache创建缓存.
[root@h3 ~]# yum makecache Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * addons: mirror.esocc.com * base: mirror.esocc.com * extras: mirror.esocc.com * updates: mirror.esocc.com addons | 1.9 kB 00:00 addons/filelists_db | 573 B 00:00 addons/other_db | 554 B 00:00 base | 1.1 kB 00:00 base/filelists | 3.0 MB 00:28 base/other | 11 MB 01:26 extras | 2.1 kB 00:00 extras/filelists_db | 213 kB 00:01 extras/other_db | 439 kB 00:03 updates | 1.9 kB 00:00 updates/filelists_db | 2.6 MB 00:18 updates/other_db | 12 MB 01:32 base 2770/2770 base 2770/2770 Metadata Cache Created
第三步，查找memcached包是否已经存在。
[root@h3 ~]# yum search memcached Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * addons: mirrors.neusoft.edu.cn * base: mirrors.neusoft.edu.cn * extras: mirrors.neusoft.edu.cn * updates: mirrors.neusoft.edu.cn ================================ Matched: memcached ================================= php-pecl-memcache.i386 : Extension to work with the Memcached caching daemon
很是兴奋，找到了，安装以下试试看：
[root@h3 ~]# yum install memcached Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * addons: mirror.esocc.com * base: mirror.esocc.com * extras: mirror.esocc.com * updates: mirror.esocc.com Setting up Install Process No package memcached available. Nothing to do
结果很出乎意料之外，安装不了,这是因为缺少了扩展包 EPEL(Extra Packages for Enterprise Linux)，可以用 yum repolist 命令检查下。
解决方法很简单，再安装一个包:
[root@h3 ~]# rpm -ivh http://dl.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm Retrieving http://dl.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm warning: /var/tmp/rpm-xfer.OplvnY: Header V3 DSA signature: NOKEY, key ID 217521f6 Preparing... ########################################### [100%] 1:epel-release ########################################### [100%]
如果是CentOS 6.x的，执行以下代码：
rpm -ivh http://dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-5.noarch.rpm
yum repolist 检查下：
[root@h3 ~]# yum repolist Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * addons: mirrors.163.com * base: mirrors.163.com * epel: mirrors.neusoft.edu.cn * extras: mirrors.163.com * updates: mirrors.163.com epel | 3.6 kB 00:00 epel/primary_db | 3.1 MB 00:26 repo id repo name status addons CentOS-5 - Addons 0 base CentOS-5 - Base 2,770 epel Extra Packages for Enterprise Linux 5 - i386 5,981 extras CentOS-5 - Extras 276 updates CentOS-5 - Updates 375 repolist: 9,402
最后一步，安装memcached：
[root@h3 ~]# yum install memcached Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * addons: mirrors.neusoft.edu.cn * base: mirrors.neusoft.edu.cn * epel: mirrors.neusoft.edu.cn * extras: mirrors.neusoft.edu.cn * updates: mirrors.neusoft.edu.cn Setting up Install Process Resolving Dependencies --> Running transaction check ---> Package memcached.i386 0:1.4.5-1.el5 set to be updated --> Finished Dependency Resolution Dependencies Resolved ===================================================================================== Package Arch Version Repository Size ===================================================================================== Installing: memcached i386 1.4.5-1.el5 epel 71 k Transaction Summary ===================================================================================== Install 1 Package(s) Upgrade 0 Package(s) Total download size: 71 k Is this ok [y/N]: y Downloading Packages: memcached-1.4.5-1.el5.i386.rpm | 71 kB 00:00 warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID 217521f6 epel/gpgkey | 1.7 kB 00:00 Importing GPG key 0x217521F6 "Fedora EPEL <epel@fedoraproject.org>" from /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL Is this ok [y/N]: y Running rpm_check_debug Running Transaction Test Finished Transaction Test Transaction Test Succeeded Running Transaction Installing : memcached 1/1 Installed: memcached.i386 0:1.4.5-1.el5 Complete!
安装完成， 测试一下：
[root@h3 ~]# /etc/rc.d/init.d/memcached start Starting memcached: [ OK ] [root@h3 ~]# telnet localhost 11211 Trying 127.0.0.1... Connected to localhost (127.0.0.1). Escape character is '^]'. set key 0 0 2 ok STORED get key VALUE key 0 2 ok END
完成操作，希望会对你有所帮助！