memcached 安装、启动

1.安装

先安装 libevent(memcached depended)

下载libevent-1.3b.tar.gz 后解压：

tar -zxvf libevent-1.3b.tar.gz

cd libevent-1.3b

./configure && make

make install

make verify //验证安装

下载memcached-1.2.6.tar.gz

tar -zxvf memcached-1.2.6.tar.gz

cd memcached-1.2.6

./configure && make

make install

2.How it Works

First, you start up the memcached daemon on as many spare machines as you have. The daemon has no configuration file, just a few command line options, only 3 or 4 of which you'll likely use:

# ./memcached -d -m 2048 -l 10.0.0.40 -p 11211

This starts memcached up as a daemon, using 2GB of memory, and listening on IP 10.0.0.40, port 11211. Because a 32-bit process can only address 4GB of virtual memory (usually significantly less, depending on your operating system), if you have a 32-bit server with 4-64GB of memory using PAE you can just run multiple processes on the machine, each using 2 or 3GB of memory.

eg:

/usr/local/bin/memcached -m 64m -l 127.0.0.1 -p 11211 -d -u root -P /var/run/memcached.pid -c128 -vv

注意：如果 -l 为127.0.0.1则只能在localhost访问memcache，如果想让其他ip的访问，-l需要设置为其实际的ip

 

选项	说明
-p	使用的 TCP 端口。默认为 11211
-m	最大内存大小。默认为 64M
-vv	用 very vrebose 模式启动，调试信息和错误输出到控制台
-d	作为 daemon 在后台启动
-c	最大运行的并发连接数，默认是 1024 ，按照服务器的负载量来设定
-P	设置保存 Memcache 的 pid 文件
-l	监听的服务器 IP 地址，如果有多个地址的话
-u	运行 Memcache 的用户，默认不能用 root 启动，所以当前用户为 root 用户时，需要用 -u 参数来指定

更多的参数可以 /usr/local/bin/memcached -h 查看

关闭
kill 'cat /var/run/memcached.pid'

3.问题解决

如果遇到 memcached:error while loading shared libraries:libevent-1.3b.so.1:cannot open shared object file:No such file or directory.

使用 LD_DEBUG=libs /usr/local/bin/memcached -v 查看其启动的时候，加载lib情况；具体的不列出；

执行：ln -s /usr/local/lib/libevent-1.3b.so.1 /lib/libevent-1.3b.so.1问题可以解决；