linux下memcached安装

memcached安装       

1. 下载, memcached需要先安装libevent

memcached的下载地址:http://www.danga.com/memcached/dist/memcached-1.2.6.tar.gzs

                                   http://memcached.googlecode.com/files/memcached-1.4.5.tar.gz最新版
libevent的下载地址 :http://www.monkey.org/~provos/libevent-1.2.tar.gz

                              http://www.monkey.org/~provos/libevent/   

    #cd /usr/local
    #mkdir memcached
    #mkdir libevent

2. 安装libevent

       #  tar xzvf libevent-1.2.tar.gz
       # cd libevent-1.2
      # ./configure --prefix=/usr/local/libevent  
       # make  
       # make install 

    检查是否安装成功:

    #cd /usr/local/libevent/lib
   
    如果有libevent-1.3c.so.1  libevent-1.3c.so.1.0.3  libevent.a  libevent.la  libevent.so 这几个文件存在，说明安装成功

3.安装memcached

        #  tar xzvf memcached-1.2.6.tar.gz   
       # cd memcached-1.2.6 
       # ./configure --with-libevent=/usr/local/libevent --prefix=/usr/local/memcached 
       # make  
       # make install 

    检查是否安装成功:

    #cd /usr/local/memcached/bin

    如果memcached  memcached-debug这2个文件存在，说明安装成功

4.执行

       #cd /usr/local/memcached/bin
       # ./memcached -h  

    如果出现：
       1. memcached 1.2.6 
       2. -p       TCP port number to listen on (default: 11211)  
       3. -U       UDP port number to listen on (default: 0, off)  
       4. -s      unix socket path to listen on (disables network support)  
       5. -l   interface to listen on, default is INDRR_ANY  
       6. -d            run as a daemon  
       7. -r            maximize core file limit  
       8. -u  assume identity of  (only when run as root)  
       9. -m       max memory to use for items in megabytes, default is 64 MB  
      10. -M            return error on memory exhausted (rather than removing items)  
      11. -c       max simultaneous connections, default is 1024 
      12. -k            lock down all paged memory  
      13. -v            verbose (print errors/warnings while in event loop)  
      14. -vv           very verbose (also print client commands/reponses)  
      15. -h            print this help and exit  
      16. -i            print memcached and libevent license  
      17. -b            run a managed instanced (mnemonic: buckets)  
      18. -P      save PID in , only used with -d option  
      19. -f    chunk size growth factor, default 1.25 
      20. -n     minimum space allocated for key+value+flags, default 48 

    说明安装成功，并且路径配置正确。

    有可能会出现：

       memcached: error while loading shared libraries: libevent-1.2.so.1: cannot open shared object file: No such file or directory 

    说明 没有找到文件：libevent-1.2.so.1

    解决办法：

    第一步. 查看下lib路径:
    [farman@localhost bin]$ LD_DEBUG=libs /usr/local/memcached/bin/memcached -v
         31386:     find library=libevent-1.2.so.1 [0]; searching
         31386:      search cache=/etc/ld.so.cache
         31386:      search path=/lib/tls/i686/sse2:/lib/tls/i686:/lib/tls/sse2:/lib/tls:/lib/i686/sse2:/lib/i686:/lib/sse2:/lib:/usr/lib/tls/i686/sse2:/usr/lib/tls/i686:/usr/lib/tls/sse2:/usr/lib/tls:/usr/lib/i686/sse2:/usr/lib/i686:/usr/lib/sse2:/usr/lib                (system search path)
         31386:       trying file=/lib/tls/i686/sse2/libevent-1.2.so.1
         31386:       trying file=/lib/tls/i686/libevent-1.2.so.1
         31386:       trying file=/lib/tls/sse2/libevent-1.2.so.1
         31386:       trying file=/lib/tls/libevent-1.2.so.1
         31386:       trying file=/lib/i686/sse2/libevent-1.2.so.1
         31386:       trying file=/lib/i686/libevent-1.2.so.1
         31386:       trying file=/lib/sse2/libevent-1.2.so.1
         31386:       trying file=/lib/libevent-1.2.so.1
         31386:       trying file=/usr/lib/tls/i686/sse2/libevent-1.2.so.1
         31386:       trying file=/usr/lib/tls/i686/libevent-1.2.so.1
         31386:       trying file=/usr/lib/tls/sse2/libevent-1.2.so.1
         31386:       trying file=/usr/lib/tls/libevent-1.2.so.1
         31386:       trying file=/usr/lib/i686/sse2/libevent-1.2.so.1
         31386:       trying file=/usr/lib/i686/libevent-1.2.so.1
         31386:       trying file=/usr/lib/sse2/libevent-1.2.so.1
         31386:       trying file=/usr/lib/libevent-1.2.so.1
         31386:
    /home/farman/cacheinstall/bin/memcached: error while loading shared libraries: libevent-1.2.so.1: cannot open shared object file: No such file or directory

    第二步. 将libevent-1.3c.so.1拷贝到任何一个列出的lib 下就可以了。
    或者 软链接
    [farman@localhost lib]$ su root
    Password:
    [root@localhost lib]# ln -s /home/farman/install/lib/libevent-1.2.so.1 /usr/lib/libevent-1.2.so.1

    启动服务 ：
    [root@localhost lib]# exit
    不能用root启动
   
    前台启动测试
    [farman@localhost bin]#./memcached -m 10 -p 12000 -c 256 -vv
   
    后台启动
    [farman@localhost bin]#./memcached -d -m 10 -p 12000 -c 256 -P /tmp/memcached.pid
                           ./memcached -d -m 128 -u root -l 127.0.0.1 -p 11211 -c 64 -P /tmp/memcached.pid
    参数说明:
   
    -d选项是启动一个守护进程
    -m是分配给Memcache使用的内存数量，单位是MB，我这里是10MB
    -u是运行Memcache的用户，我这里是root
    -l是监听的服务器IP地址
    -p是设置Memcache监听的端口,最好是1024以上的端口
    -c选项是最大运行的并发连接数，默认是1024，按照你服务器的负载量来设定
    -P是设置保存Memcache的pid文件