memcache集群

四臺電腦
memcache：192.168.1.201 192.168.1.202
magent： 192.168.1.100 192.168.1.101
實(shí)驗(yàn)：
1、安裝libevent軟件(四臺)
[root@localhost ~]# tar -zxvf libevent-2.0.21-stable.tar.gz -C /usr/src/
[root@localhost ~]# cd /usr/src/libevent-2.0.21-stabl
[root@localhost libevent-2.0.21-stable]# ./configure --prefix=/usr/
[root@localhost libevent-2.0.21-stable]# make && make install
2、安裝memcached軟件(Memcached服務(wù)器 2臺)
[root@localhost ~]# tar -zxvf memcached-1.4.31.tar.gz -C /usr/src/
[root@localhost ~]# cd /usr/src/memcached-1.4.31/
[root@localhost memcached-1.4.31]# ./configure --enable-memcache --with-libevent=/usr/
[root@localhost memcached-1.4.31]# make && make install
主緩存：
[root@localhost ~]# memcached -d -m 1024 -u root -l 192.168.1.201 -p 11211
備緩存：
[root@localhost ~]# memcached -d -m 1024 -u root -l 192.168.1.202 -p 11211
[root@localhost ~]# netstat -anpt | grep memcached
3、安裝magent 軟件(Magent 服務(wù)器 2臺)
[root@localhost ~]# mkdir /usr/magent
[root@localhost ~]# tar -zxvf magent-0.6.tar.gz -C /usr/magent/
[root@localhost ~]# cd /usr/magent/
[root@localhost magent]# vim ketama.h
添加(頭部添加)：
#ifndef SSIZE_MAX
#define SSIZE_MAX 32767
#endif
[root@localhost magent]# ln -s /usr/lib64/libm.so /usr/lib64/libm.a
[root@localhost magent]# ln -s /usr/lib64/libevent-1.4.so.2 /usr/lib64/libevent.a
無法make的時候需要安裝libevent-1.4.so.2
[root@localhost magent]# /sbin/ldconfig
[root@localhost magent]# sed -i "s#LIBS = -levent#LIBS = -levent -lm#g" Makefile
[root@localhost magent]# make
[root@localhost magent]# cp magent /usr/bin/
主緩存和備緩存一樣的啟動命令(-l 是漂移IP 還沒有搭建Keepalived服務(wù) 暫時不要啟動Magent服務(wù))
[root@localhost ~]# magent -u root -n 51200 -l 192.168.1.10 -p 12000 -s 192.168.1.201:11211 -b 192.168.1.202:11211
[root@localhost ~]# magent -u root -n 51200 -l 192.168.1.10 -p 12000 -s 192.168.1.201:11211 -b 192.168.1.202:11211
-u：用戶
-n：最大連接數(shù)
-l：magent 對外監(jiān)聽IP 地址
-p：magent 對外監(jiān)聽端口
-s：magent 主緩存IP 地址和端口
-b：magent 備緩存IP 地址和端口
[root@localhost ~]# ps -elf | grep magent
4、安裝keepalived 軟件(Magent 服務(wù)器 2臺)
[root@localhost ~]# yum –y install openssl*
[root@localhost ~]# tar -zxvf keepalived-1.2.13.tar.gz -C /usr/src/
[root@localhost ~]# cd /usr/src/keepalived-1.2.13/
[root@localhost keepalived-1.2.13]# ./configure --prefix=/ --with-kernel-dir=/usr/src/kernels/2.6.32-431.el6.x86_64
[root@localhost keepalived-1.2.13]# make && make install
配置主緩存服務(wù)器
[root@localhost ~]# vim /etc/keepalived/keepalived.conf
修改：
global_defs {
router_id LVS_DEVEL_R1
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.10
}
}
[root@localhost ~]# service keepalived restart
[root@localhost ~]# ip add show dev eth0
配置備緩存服務(wù)器
[root@localhost ~]# vim /etc/keepalived/keepalived.conf
修改：
global_defs {
router_id LVS_DEVEL_R2
}
vrrp_instance VI_1 {
state BACKUP
priority 99
......
virtual_ipaddress {
192.168.1.10
}
---其他參數(shù)與主緩存服務(wù)器保持一致----
}
[root@localhost ~]# service keepalived restart
[root@localhost ~]# ip add show dev eth0
驗(yàn)證：
客戶端ping 192.168.1.10 查看VIP的變化情況。
5、驗(yàn)證：
1）用主緩存節(jié)點(diǎn)連接上主緩存的1200端口插入數(shù)據(jù)
[root@localhost ~]# telnet 192.168.1.10 12000
Trying 192.168.1.10...
Connected to 192.168.1.10.
Escape character is '^]'.
set key 33 0 5
ggggg
STORED
quit
Connection closed by foreign host.
2）查看插入的數(shù)據(jù)
[root@localhost ~]# telnet 192.168.1.10 12000
Trying 192.168.1.10...
Connected to 192.168.1.10.
Escape character is '^]'.
get key
VALUE key 33 5
ggggg
END
quit
Connection closed by foreign host.
3）連接主緩存節(jié)點(diǎn)的11211端口進(jìn)行查看
[root@localhost ~]# telnet 192.168.1.201 11211
Trying 192.168.1.100...
Connected to 192.168.1.100.
Escape character is '^]'.
get key
VALUE key 33 5
ggggg
END
quit
Connection closed by foreign host.
4）連接主緩存節(jié)點(diǎn)的11211端口進(jìn)行查看
[root@localhost ~]# telnet 192.168.1.202 11211
Trying 192.168.1.200...
Connected to 192.168.1.200.
Escape character is '^]'.
get key
VALUE key 33 5
ggggg
END
quit
Connection closed by foreign host.
說明主緩存節(jié)點(diǎn)和備緩存節(jié)點(diǎn)都有數(shù)據(jù)。
宕掉主緩存節(jié)點(diǎn)。
1）停止memcached進(jìn)程（或者斷開主緩存節(jié)點(diǎn)的網(wǎng)卡），
2）客戶端查看
[root@localhost ~]# telnet 192.168.1.10 12000
Trying 192.168.1.10...
Connected to 192.168.1.10.
Escape character is '^]'.
get key
VALUE key 33 5
ggggg
END

總結(jié)：
memcache的優(yōu)點(diǎn)：可以做多主或者多從
memcache的缺點(diǎn)：當(dāng)主緩存節(jié)點(diǎn)當(dāng)?shù)粲只謴?fù)，之前的緩存數(shù)據(jù)會丟失。