Memcache cluster
Four computers
Memcache:192.168.1.201 192.168.1.202
Magent: 192.168.1.100 192.168.1.101
Experiment:
1. Install libevent software (4 sets)
[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. Install memcached software (2 Memcached servers)
[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
Master cache:
[root@localhost] # memcached-d-m 1024-u root-l 192.168.1.201-p 11211
Prepare the cache:
[root@localhost] # memcached-d-m 1024-u root-l 192.168.1.202-p 11211
[root@localhost ~] # netstat-anpt | grep memcached
3. Install magent software (2 Magent servers)
[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
Add (header add):
# 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
You need to install libevent-1.4.so.2 when you cannot make
[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/
The master cache and slave cache have the same startup command (- l is drift IP has not yet set up the Keepalived service, do not start the Magent service for the time being)
[root@localhost] # magent-u root-n 51200-l 192.168.1.10-p 12000-s 192.168.1.201purl 11211-b 192.168.1.202
[root@localhost] # magent-u root-n 51200-l 192.168.1.10-p 12000-s 192.168.1.201purl 11211-b 192.168.1.202
-u: user
-n: maximum number of connections
-l:magent external monitoring IP address
-p:magent external listening port
-s:magent main cache IP address and port
-b:magent cache IP address and port
[root@localhost ~] # ps-elf | grep magent
4. Install keepalived software (2 Magent servers)
[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
Configure the main cache server
[root@localhost ~] # vim / etc/keepalived/keepalived.conf
Modify:
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
Configure standby cache server
[root@localhost ~] # vim / etc/keepalived/keepalived.conf
Modify:
Global_defs {
Router_id LVS_DEVEL_R2
}
Vrrp_instance VI_1 {
State BACKUP
Priority 99
.
Virtual_ipaddress {
192.168.1.10
}
-other parameters are consistent with the main cache server-
}
[root@localhost ~] # service keepalived restart
[root@localhost ~] # ip add show dev eth0
Verify:
The client ping 192.168.1.10 looks at the changes in VIP.
5. Verify:
1) use the main cache node to connect the port 1200 of the main cache to insert data
[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) View the inserted data
[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) connect port 11211 of the main cache node to view
[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) connect port 11211 of the main cache node to view
[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.
Indicates that both the primary cache node and the standby cache node have data.
Shut down the main cache node.
1) stop the memcached process (or disconnect the network card of the primary cache node)
2) client view
[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
Summary:
Advantages of memcache: it can be multi-master or multi-slave.
The disadvantage of memcache: when the main cache node is pawned and restored, the previously cached data will be lost.
