Linux环境上安装memcached手册
在Linux环境上安装memcached手册 由于memcached安装时，需要使用libevent类库，所以先安装libeventlibevent下载网址:http://www.monkey.org/~provos/libevent/
本手册中下载的是 libevent-1.4.8-stable.tar.gz版本安装步骤如下:
1. 解压缩
tar xzfv libevent-1.4.8-stable.tar.gz
2. 进入到 libevent-1.4.8-stable目录
cd libevent-1.4.8-stable
3. 编译，安装
./configure
make
make install
注：默认安装到/usr/local/lib/目录
接下来，安装memcached
memcached下载网址:http://www.danga.com/memcached/download.bml
本手册中下载的是 memcached-1.2.6.tar.gz版本
安装步骤如下:
1. 解压缩
tar xzfv memcached-1.2.6.tar.gz
2. 进入到 memcached-1.2.6目录
cd memcached-1.2.6
3. 编译，安装
./configure --prefix=/local/memcached
make
make install
安装完成后，会在 /local/memcached 出现 bin和share目录
进行 bin目录，启动 memcache
方法如下:
./memcached -d -u nobody -m 512 127.0.0.1 -p 11211
此时，会报一个异常
error while loading shared libraries: libevent-1.4.so.2: cannot open shared object file: No such file or directory
原因是找不到libevent-1.4.so.2类库，解决办法如下：
使用LD_DEBUG=help ./memcached -v来确定 加载的类库路径,方法如下:
LD_DEBUG=libs ./memcached -v 2>&1 > /dev/null | less
则系统会显示:
linux:/local/memcached/bin # LD_DEBUG=libs ./memcached -v 2>&1 > /dev/null | less20421: find library=libevent-1.4.so.2; searching 20421: search cache=/etc/ld.so.cache20421: 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)
20421: trying file=/lib/tls/i686/sse2/libevent-1.4.so.220421: trying file=/lib/tls/i686/libevent-1.4.so.220421: trying file=/lib/tls/sse2/libevent-1.4.so.220421: trying file=/lib/tls/libevent-1.4.so.220421: trying file=/lib/i686/sse2/libevent-1.4.so.220421: trying file=/lib/i686/libevent-1.4.so.220421: trying file=/lib/sse2/libevent-1.4.so.220421: trying file=/lib/libevent-1.4.so.220421: trying file=/usr/lib/tls/i686/sse2/libevent-1.4.so.220421: trying file=/usr/lib/tls/i686/libevent-1.4.so.220421: trying file=/usr/lib/tls/sse2/libevent-1.4.so.220421: trying file=/usr/lib/tls/libevent-1.4.so.220421: trying file=/usr/lib/i686/sse2/libevent-1.4.so.220421: trying file=/usr/lib/i686/libevent-1.4.so.220421: trying file=/usr/lib/sse2/libevent-1.4.so.220421: trying file=/usr/lib/libevent-1.4.so.220421: ./memcached: error while loading shared libraries: libevent-
1.4.so.2: cannot open shared object file: No such file or directory 我们看到，memcached会到很多地方去找，所以根据其它求，我们只需建一个软链接，指定到我们安装的类库上即可
方法如下：
ln -s /usr/local/lib/libevent-1.4.so.2 /lib/libevent-1.4.so.2
现在可以正常启动memcached了
./memcached -d -u nobody -m 512 127.0.0.1 -p 11211
到这里，看到memcached已经启动，说明安装成功。
memcache启动参数说明:
The options for memcached are: -l
Listen on
; default to INDRR_ANY. This is an important option to consider as there is no other way to secure the installation. Binding to an internal or firewalled network interface is suggested. -d Run memcached as a daemon.
-u
Assume the identity of(only when run as root).
-m
UseMB memory max to use for object storage
; the default is 64 megabytes. -M Instead of throwing items from the cache when max memory is reached
, throw an error -c
Usemax simultaneous connections
; the default is 1024. -k Lock down all paged memory. This is a somewhat dangerous option with large caches
, so consult the README and memcached homepage for configuration suggestions. -p
Listen on port
, the default is port 11211. -r
Maximize core file limit
-M
Disable automatic removal of items from the cache when out of memory. Additions will not be possible until adequate space is freed up.
-r
Raise the core file size limit to the maximum allowable.
-h
Show the version of memcached and a summary of options.
-v
Be verbose during the event loop
; print out errors and warnings. -vv Be even more verbose
; same as -v but also print client commands and responses. -i Print memcached and libevent licenses.
-P
Print pidfile to
, only used under -d option.
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