memcache的安装

一、什么是memcache memcache是一个高性能的分布式的内存对象缓存系统，通过在内存里维护一个统一的巨大的hash表，它能够用来存储各种格式的数据，包括图像、视频、文件以及数据库检索的结果等 二、libevent介绍 libevent是一个事件触发的网络库，适用于windows、linux、bsd等多种平台，内部使用select、epoll、kqueue等系统调用管理事件机制。著名的用于apache的php缓存库memcached据说也是libevent based，而且libevent在使用上可以做到跨平台 三、准备工作下载：memcache：http://www.danga.com/memcached/dist/memcached-1.2.2.tar.gz 下载：http://www.monkey.org/~provos/libevent-1.3.tar.gz 四、安装过程 1、卸载低版本的libevent #ls -al /usr/lib |grep libevent lrwxrwxrwx 1 root root libevent-1.1a.so.1 -> libevent-1.1a.so.1.0.2 -rwxr-xr-x 1 root root libevent-1.1a.so.1.0.2 查看当前libevent版本，如果版本低于1.3，建议先卸载 #rpm -e libevent --nodeps 卸载libevent， #ls -al /usr/lib |grep libevent 再次查看，卸载成功 2、安装libevent #tar zxvf libevent-1.3.tar.gz 解压libevent #cd libevent-1.3 #./configure --prefix=/usr #make #make install 配置安装libevent到/usr目录下 #ls -al /usr/lib |grep libevent lrwxrwxrwx 1 root root 21 11?? 12 17:38 libevent-1.2.so.1 -> libevent-1.2.so.1.0.3 -rwxr-xr-x 1 root root 263546 11?? 12 17:38 libevent-1.2.so.1.0.3 -rw-r–r– 1 root root 454156 11?? 12 17:38 libevent.a -rwxr-xr-x 1 root root 811 11?? 12 17:38 libevent.la lrwxrwxrwx 1 root root 21 11?? 12 17:38 libevent.so -> libevent-1.2.so.1.0.3 再此查看，安装libevent1.3版本成功 3、安装memcached，同时需要安装中指定libevent的安装位置 #tar zxvf memcached-1.2.6.tar.gz #cd memcached-1.2.6 解压进入mamcache目录 #./configure --with-libevent=/usr/ #make #make install 安装完成后会把memcached放到 /usr/local/bin/memcached #ls -al /usr/local/bin/memcached -rwxr-xr-x 1 root root 137986 11?? 12 17:39 /usr/local/bin/memcached 查看memcache安装成功 五、memcached的基本设置 #/usr/local/bin/memcached -d -m 2000 -u root -p 12000 -c 256 -P ./memcached.pid 1.启动Memcache的服务器端： # /usr/local/bin/memcached -d -m 10 -u root -l 192.168.0.200 -p 12000 -c 256 -P /tmp/memcached.pid -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，如果有多个地址的话，我这里指定了服务器的IP地址192.168.0.200， -p是设置Memcache监听的端口，我这里设置了12000，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，我这里设置了256，按照你服务器的负载量来设定， -P是设置保存Memcache的pid文件，我这里是保存在 /tmp/memcached.pid， 也可以启动多个守护进程，不过端口不能重复。 六：客户端测试 1、下载java_memcached-release_2.5.1.zip 2、创建一个java project，将java_memcached-release_2.5.1.jar包引用。 3、在main函数中，创建2个类，如下 package com.danga.MemCached; import java.io.Serializable; import com.danga.MemCached.MemCachedClient; import com.danga.MemCached.SockIOPool; /** @author chenhaibin * */ public class TestObj implements Serializable { /** * */ private static final long serialVersionUID = 1L; private String name; private Long id; /** * */ public TestObj() { } public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String toString() { return "id:"+this.getId()+";name:"+this.getName(); } } package com.danga.MemCached; import java.io.Serializable; import com.danga.MemCached.MemCachedClient; import com.danga.MemCached.SockIOPool; /** * @author chenhaibin */ /** @author chenhaibin */ public class MemcacheTest { //create a static client as most installs only need // a single instance protected static MemCachedClient mcc = new MemCachedClient(); // set up connection pool once at class load static { // server list and weights String[] servers ={"192.168.0.226:12000"}; /**memcached服务器的IP和端口*/ Integer[] weights = { 3 }; // grab an instance of our connection pool SockIOPool pool = SockIOPool.getInstance(); // set the servers and the weights pool.setServers( servers ); pool.setWeights( weights ); // set some basic pool settings // 5 initial, 5 min, and 250 max conns // and set the max idle time for a conn // to 6 hours pool.setInitConn( 5 ); pool.setMinConn( 5 ); pool.setMaxConn( 250 ); pool.setMaxIdle( 1000 * 60 * 60 * 6 ); // set the sleep for the maint thread // it will wake up every x seconds and // maintain the pool size pool.setMaintSleep( 30 ); // set some TCP settings // disable nagle // set the read timeout to 3 secs // and don't set a connect timeout pool.setNagle( false ); pool.setSocketTO( 3000 ); pool.setSocketConnectTO( 0 ); // initialize the connection pool pool.initialize(); // lets set some compression on for the client // compress anything larger than 64k mcc.setCompressEnable( true ); mcc.setCompressThreshold( 64 * 1024 ); } public static void bulidCache() { mcc.set( "foo", "This is a test String" ); TestObj obj = new TestObj(); obj.setId(new Long(1)); obj.setName("test"); mcc.set("testObj", obj); } // from here on down, you can call any of the client calls public static void output() { // String bar = (String) mcc.get( "foo" ); System.out.println(bar); TestObj obj = (TestObj)mcc.get("testObj"); System.out.println("ID : "+obj.getId()+"/n"+"Name : "+obj.getName()); } public static void main(String[] args) { bulidCache(); output(); } } 4、运行结果 This is a test String ID : 1 Name : test memcache配置成功~~~~~~~~~~~~~~~~~~~~~