近期因为生产环境需要调整memcached的缓存模式，之前也考虑换redis，因为可能会涉及到应用程序的调整，所以暂时先考虑上memcached repcached模式。
主节点：10.10.10.164 CentOS6.7_x64
从节点：10.10.10.165 CentOS6.7_x64
1）安装依赖关系（时间服务器也要检查下）
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[root@tomcat01 src]
# yum -y install install g++ make libevent-devel
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2）配置memcached（主从节点，同样的操作）
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[root@tomcat01 ~]
# cd /usr/local/src
[root@tomcat01 src]
# tar -xf memcached-1.4.24.tar.gz
[root@tomcat01 memcached-1.4.24]
# cd ..
[root@tomcat01 src]
# cd memcached-1.4.24
[root@tomcat01 memcached-1.4.24]
# make
[root@tomcat01 memcached-1.4.24]
# make install
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3）配置memcached-repcached（主从节点，同样的操作）
上传memcached-repached包到/usr/local/src下
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[root@tomcat01 src]
# tar xf memcached-1.2.8-repcached-2.2.tar.gz
[root@tomcat01 src]
# cd memcached-1.2.8-repcached-2.2
[root@tomcat01 memcached-1.2.8-repcached-2.2]
# ./configure --enable-replication
[root@tomcat01 memcached-1.2.8-repcached-2.2]
# make
[root@tomcat01 memcached-1.2.8-repcached-2.2]
# make install
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4）启动主节点
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[root@tomcat01 ~]
# memcached -v -d -p 11211 -l 10.10.10.164 -u root -P /tmp/memcached1.pid
[root@tomcat01 ~]
# replication: listen
说明：accept为启动正常的状态
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5）启动从节点
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[root@tomcat02 ~]
# memcached -v -d -p 11211 -l 10.10.10.165 -u root -x 10.10.10.164 -P
/tmp/memcached1
.pid
[root@tomcat02 ~]
# replication: connect (peer=10.10.10.164:11212)
replication: marugoto copying
replication: start
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6）telnet进行验证
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[root@tomcat01 ~]
# telnet 10.10.10.164 11211
Trying 10.10.10.164...
Connected to 10.10.10.164.
Escape character is
'^]'
.
set
userId 0 0 5
12345
STORED
[root@tomcat01 ~]
# telnet 10.10.10.164 11211
Trying 10.10.10.164...
Connected to 10.10.10.164.
Escape character is
'^]'
.
get userId
VALUE userId 0 5
12345
END
[root@tomcat02 src]
# replication: connect (peer=10.10.10.164:11212)
replication: marugoto copying
replication: start
replication: close
replication: listen
replication: accept
replication: marugoto start
replication: marugoto 1
replication: marugoto owari
replication: close
replication: listen
说明：以上为连接状态
[root@tomcat02 ~]
# telnet 10.10.10.165 11211
Trying 10.10.10.165...
Connected to 10.10.10.165.
Escape character is
'^]'
.
get userId
VALUE userId 0 5
12345
END
说明：根据上面的输出结果，可以判断userId的键值为12345
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7）模拟故障（如主memcached服务挂掉了）
a、检查从节点上的，memcached储值状态
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[root@tomcat02 ~]
# telnet 10.10.10.165 11211
Trying 10.10.10.165...
Connected to 10.10.10.165.
Escape character is
'^]'
.
get userId
VALUE userId 0 5
12345
END
说明：从节点的键值仍旧存在
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b、在从节点上添加新键值
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[root@tomcat02 ~]
# telnet 10.10.10.165 11211
Trying 10.10.10.165...
Connected to 10.10.10.165.
Escape character is
'^]'
.
get userId
VALUE userId 0 5
12345
END
set
userId2 0 0 6
123456
STORED
get userId2
VALUE userId2 0 6
123456
END
说明：添加userId2的新键值，userId2的值为123456
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c、恢复主有的节点
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[root@tomcat01 ~]
# memcached -v -d -p 11211 -l 10.10.10.164 -u root -x 10.10.10.165 -P
/tmp/memcached
.pid
[root@tomcat01 ~]
# replication: connect (peer=10.10.10.165:11212)
replication: marugoto copying
replication: start
[root@tomcat01 ~]
# telnet 10.10.10.165 11211
Trying 10.10.10.165...
Connected to 10.10.10.165.
Escape character is
'^]'
.
get userId
VALUE userId 0 5
12345
END
get userId2
VALUE userId2 0 6
123456
END
# 然后我们在此节点上添加一个新的键值userId3
set
userId3 0 0 7
7654321
STORED
get userId3
VALUE userId3 0 7
7654321
END
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d、在另外一台节点上进行验证
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[root@tomcat02 ~]
# telnet 10.10.10.165 11211
Trying 10.10.10.165...
Connected to 10.10.10.165.
Escape character is
'^]'
.
get userId
VALUE userId 0 5
12345
END
set
userId2 0 0 6
123456
STORED
get userId2
VALUE userId2 0 6
123456
END
get userId3
VALUE userId3 0 7
7654321
END
说明：新添加的键值在此节点上，仍旧存在
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e、在10.10.10.165上，设置新键值wanwan
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set
wanwan 0 0 8
wan08wan
STORED
get wanwan
VALUE wanwan 0 8
wan08wan
END
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f、在10.10.10.164上进行查看
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[root@tomcat01 ~]
# telnet 10.10.10.164 11211
Trying 10.10.10.164...
Connected to 10.10.10.164.
Escape character is
'^]'
.
get wanwan
VALUE wanwan 0 8
wan08wan
END
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8）memcached小结：
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a、Repcached 的 Memcached 主从，主从之间可以相互读写
b、由于memcached的主/从没有抢占功能，因此主恢复之后，只能作为现有主节点的从节点
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本文转自 冰冻vs西瓜 51CTO博客，原文链接：http://blog.51cto.com/molewan/1956420，如需转载请自行联系原作者
