memcached搭建

任务：在现有的项目中添加memcache以减少数据库压力，就先搭建了一个测试环境

系统：Ubuntu14

步骤：memcached依赖libevent包，我这个系统已经有了，就没有安装

          安装memcached ： apt-get install memcached

          修改配置：  vim /etc/memcached.conf 将里面的 -l 127.0.0.1注释掉（不注释代表只能本机访问）

          启动memcached： /etc/init.d/memcached start

          测试： telnet localhost 11211 提示 connected to memcached成功

项目中用的是xmemcached，把jar包导入项目，编写测试代码：

public static void main(String[] args) {
		MemcachedClientBuilder builder = new XMemcachedClientBuilder(
				AddrUtil.getAddresses("192.168.64.129:11211"));
		MemcachedClient memcachedClient = null;
		try {
			memcachedClient = builder.build();
			memcachedClient.set("hello", 0, "Hello,xmemcached");
			String value = memcachedClient.get("hello");
			System.out.println("hello=" + value);
			memcachedClient.delete("hello");
			value = memcachedClient.get("hello");
			System.out.println("hello=" + value);
		} catch (MemcachedException e) {
			System.err.println("MemcachedClient operation fail");
			e.printStackTrace();
		} catch (TimeoutException e) {
			System.err.println("MemcachedClient operation timeout");
			e.printStackTrace();
		} catch (InterruptedException e) {
			// ignore
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		try {
			// close memcached client
			memcachedClient.shutdown();
		} catch (IOException e) {
			System.err.println("Shutdown MemcachedClient fail");
			e.printStackTrace();
		}
	}

输出：略
下一步是要建立一个双机高可用的，准备用keepalived，到时候再写