Shulou(Shulou.com)06/02 Report--

Memcache cluster

Memcached is a high-performance distributed in-memory object caching system, which is used for dynamic Web applications to reduce database load. By buffering in memory

Save data and objects to reduce the number of times to read the database, thereby improving the speed of dynamic, database-driven websites. Memcached is based on a storage key / value

That's right, hashmap. Its daemon (daemon) is written in C, but the client can be written in any language and through the memcached protocol

Communicate with the daemon.

I. install the software

1. All four are equipped with libevent software.

21 tar zxf libevent-2.0.22-stable.tar.gz 22 cd libevent-2.0.22-stable/ 23. / configure & & make & & make install installs keepalived software (the first two keepalived servers)

(1) installation

16 tar zxf keepalived-1.2.13.tar.gz 17 cd keepalived-1.2.13/18 yum-y install openssl-devel19. / configure-- prefix=/ & & make & & make install compilation and installation (2) modify vim / etc/keepalived/keepalived.conf global_defs {router_id LVS_DEVEL_1}

Vrrp_instance VI_1 {

State MASTER

Interface ens33

Virtual_router_id 51

Priority 100

Advert_int 1

Authentication {

Auth_type PASS

Auth_pass 1111

}

Virtual_ipaddress {

192.168.1.254

}

}

(3) start and view the IP address

3. Install magent software (the first two Magent servers)

22 mkdir / usr/magent create the required folder

23 tar zxf magent-0.6.tar.gz-C / usr/magent/

24 cd / usr/magent/

25 vim ketama.h

27 ln-s / usr/lib64/libevent-2.0.so.5 / usr/lib64/libevent.a

28 ln-s / usr/lib64/libm.so / usr/lib64/libm.a

29 make

30 ln-s / usr/magent/magent / usr/local/bin/

31 magent-u root-n 51200-l 192.168.1.254-p 1200-s 192.168.1.30 purl 11211-b 192.168.1.40 purl 11211

32 netstat-anpt | grep 1200

4. Install memcached software (2 sets after Memcached server)

21 tar zxf memcached-1.4.33.tar.gz

22 cd memcached-1.4.33/

23. / configure-- prefix=/usr/local/memcached-- with-libevent=/usr/local & & make & & make install

25 ln-s / usr/local/memcached/bin/memcached / usr/local/bin/

26 memcached-d-m 512-l 192.168.1.30-p 11211-c 1024-P / usr/local/memcached/memcached.pid-u root

27 netstat-anpt | grep 11211

28 yum-y install telnet

Third, telnet test

Instruction format:

-command name

There are mainly three commands to store data, set, add, replace

The set command is to save a data called key to the server

The add command is to add data to the server, but the server must ensure that the key does not exist and that the data will not be overwritten.

The replace command replaces an existing data. If the data does not exist, it is similar to the set function.

Get View key data

The gets command gets the value (data value) with the CAS token store, or returns null if the key does not exist.

Stats status information of all currently running Memcache servers

The stats directive will only return project status information for the specified parameters.

Version will return version information that begins with VERSION

After the flush_all instruction is executed, all cached data on the server is deleted and returns: OK

Delete deletes the key key for data

Append appends data to the value (data value) that already has key (key).

Prepend is used to append data to the value (data value) that already exists with key (key).

CAS modifies content through tokens

Incr and decr commands

Memcached incr and decr: the command is used to increase or subtract the numeric value of an existing key (key).

Quit exits telnet mode

Test on 192.168.1.10 magent

Test on 192.168.1.30 memcached

Test drift address

168.1.10

168.1.20

168.1.10

168.1.20

Summary:

Advantages of memcache: it can be multi-master or multi-slave.

Disadvantage of memcache: when the main cache node is pawned and restored, the previously cached data will be lost

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