CentOS 7部署memcached缓存服务器
1.简介1.1Memcached
Memcached是一款开源的、高性能的纯内存缓存服务软件。
MySQL数据库属于磁盘上的数据库，数据的读写较慢；而Memcached数据库属于内存中的数据库，读写速度快，但数据容易丢失。Memcached天生不支持分布式集群，只能通过程序支持分布式存储。使用Memcached数据库，提高用户访问网站速度，降低MySQL数据库服务器压力，提高网站的并发访问，因此工作中，MySQL+Memcached搭配使用。
1.2Memcached工作过程
http://s1.运维网.com/images/20180315/1521109039613608.png
2.系统环境准备
# cat /etc/re
redhat-releaseresolv.conf
# cat /etc/re
redhat-releaseresolv.conf
# cat /etc/redhat-release
CentOS Linux release 7.2.1511 (Core)
# uname -r
3.10.0-327.el7.x86_64
# getenforce
Disabled
# systemctl status firewalld.service
● firewalld.service - firewalld - dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled)
Active: inactive (dead)
# ifconfig
eth0: flags=4163mtu 1500
inet 10.0.0.21netmask 255.255.255.0broadcast 10.0.0.255
inet6 fe80::20c:29ff:fee1:ad7prefixlen 64scopeid 0x20
ether 00:0c:29:e1:0a:d7txqueuelen 1000(Ethernet)
RX packets 3228bytes 815585 (796.4 KiB)
RX errors 0dropped 0overruns 0frame 0
TX packets 419bytes 52728 (51.4 KiB)
TX errors 0dropped 0 overruns 0carrier 0collisions 0
eth1: flags=4163mtu 1500
inet 172.16.1.21netmask 255.255.255.0broadcast 172.16.1.255
inet6 fe80::20c:29ff:fee1:ae1prefixlen 64scopeid 0x20
ether 00:0c:29:e1:0a:e1txqueuelen 1000(Ethernet)
RX packets 0bytes 0 (0.0 B)
RX errors 0dropped 0overruns 0frame 0
TX packets 23bytes 1698 (1.6 KiB)
TX errors 0dropped 0 overruns 0carrier 0collisions 0
lo: flags=73mtu 65536
inet 127.0.0.1netmask 255.0.0.0
inet6 ::1prefixlen 128scopeid 0x10
looptxqueuelen 0(Local Loopback)
RX packets 0bytes 0 (0.0 B)
RX errors 0dropped 0overruns 0frame 0
TX packets 0bytes 0 (0.0 B)
TX errors 0dropped 0 overruns 0carrier 0collisions 0
3.服务端部署Memcached服务
3.1安装memcached
# yum install -y memcached
3.2启动memcached服务
# systemctl start memcached.service
3.3测试
# printf "set fengfyu 0 0 5\r\n12345\r\n"|nc 10.0.0.21 11211 ---写入数据
STORED
# printf "get fengfyu 0 0 5\r\n12345\r\n"|nc 10.0.0.21 11211 ---读取数据
VALUE fengfyu 0 5
12345
END
ERROR
4.web服务器客户端部署memcached
4.1编译安装memcached
# tar xf memcache-2.2.5.tgz
# cd memcache-2.2.5/
# /application/php/bin/ph
# /application/php/bin/phpize
Configuring for:
PHP Api Version: 20121113
Zend Module Api No: 20121212
Zend Extension Api No: 220121212
# ./configure --enable-memcache --with-php-config=/application/php/bin/php-config --with-zlib-dir && make && make install
4.2使php与memcached关联
sed -i '$a extension=memcache.so' /application/php/lib/php.ini
4.3启动php
/application/php/sbin/php-fpm
4.4客户端测试
# cat /application/nginx/html/www/mc.php
# printf "get fengyu\r\n"|nc 10.0.0.21 11211
VALUE fengyu 0 11
hello,world
END
5.web界面管理maceched
5.1解压memadmin包到/application/nginx/html/www/目录
#tar xf memadmin-1.0.12.tar.gz -C /application/nginx/html/www/
5.2浏览器访问
http://10.0.0.7/memadmin
http://s1.运维网.com/images/20180315/1521114753938593.png
6.Memcached Session共享
6.1通过程序实现，web01只需要往memcahce写session，web02从memcahce读session，当作普通数据读写（更具有通用性）
6.1通过php的配置文件，php默认将session存储在文件中，修改为存储在memcached中
sed -i 's#session.save_handler = files#session.save_handler = memcache#;$a session.save_path = "tcp://10.0.0.21:11211"' /application/php/lib/php.ini
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