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Session sharing: How php and redis clusters implement session sharing
Session sharing: How php and redis clusters implement session sharing
本篇文章给大家带来的内容是关于Session共享：php和redis集群如何实现Session共享，有一定的参考价值，有需要的朋友可以参考一下，希望对你有所帮助。
一、redis 数据库集群安装
软件版本redis-3.2.11、php-redis-2.2.4
角色 |
IP 地址 |
主机名 |
Redis 数据库服务器 |
192.168.1.41 |
Redis41 |
Slave 1 Redis 数据库服务器 |
192.168.1.42 |
Redis42 |
Slave 2 Redis 数据库服务器 |
192.168.1.43 |
Redis43 |
VIP 地址 |
192.168.1.40 |
|
三台数据库同样配置
adduser -s /sbin/nologin -d /var/lib/redis redis yum -y install gcc gcc-c++ tar -xf redis-3.2.11.tar.gz cd redis-3.2.11/ make MALLOC=libc //用MALLOC这个 环境变量去编译Redis，而且libc 并不是默认的 分配器，默认的是 jemalloc make PREFIX=/usr/local/redis install //指定安装路径 mkdir -p /usr/local/redis/conf cp redis.conf /usr/local/redis/conf/ cp sentinel.conf /usr/local/redis/conf/
常用配置选项/usr/local/redis/conf/redis.conf
– port 6379 // 端口 – bind 192.168.1.41 //IP 地址 – tcp-backlog 511 //tcp 连接总数 – timeout 0 // 连接超时时间 – tcp-keepalive 300 // 长连接时间 – daemonize yes // 守护进程方式运行 – databases 16 // 数据库个数 – logfile /var/log/redis_6379.log //pid 文件 – maxclients 10000 // 并发连接数量 – dir /var/lib/redis/6379 // 数据库目录
配置Redis能够让systemclt系统管理（非必须）
vim /usr/lib/systemd/system/redis.server
[Unit] Description=Redis In-Memory Data Store After=network.target [Service] User=redis Group=redis Type=simple ExecStart=/usr/local/redis/bin/redis-server /usr/local/redis/conf/redis.conf ExecStop=/usr/local/redis/bin/redis-cli shutdown Restart=always RestartSec=42s [Install] WantedBy=multi-user.target
二、安装 php-redis 扩展
配置 php 支持 Redis
tar zxvf phpredis-2.2.4.tar.gz cd phpredis-2.2.4 /usr/local/php/bin/phpize //用phpize生成configure配置文件 ./configure --enable-redis --with-php-config=/usr/local/php/bin/php-config make && make install php -m |grep redis
编写测试文件 redis.php 进行页面测试
<?php $redis = new redis(); $redis->connect('192.168.1.41',6379); $redis->set('redistest','666666'); echo $redis->get('redistest'); ?>
三、redis 服务器集群高可用
redis集群实现大概有以下几种方式：
redis-cluster， 官方提供的集群搭建方案（过于重量级，比较适合后期数据量较大的时候的使用） redis+keepalive 虚拟IP，多台配置非常复杂，不宜维护，需要 slaveof no one 脚本 redis+zookeeper 需要引入zookeeper，对现有代码变动较大 redis+sentinel redis自带监控中间件，哨兵模式 配置三台 redis 服务器 配置主从关系，在 slave 上添加配置 slaveof 192.168.1.41 6379 查看集群主从关系 redis-cli -h 192.168.1.41 -p 6379 info replication
修改 redis 哨兵配置文件 sentinel.conf
bind 192.168.1.41 protected-mode no daemonize yes port 26379 dir /tmp sentinel monitor mymaster 192.168.1.41 6379 2 sentinel down-after-milliseconds mymaster 3000 sentinel parallel-syncs mymaster 1 sentinel failover-timeout mymaster 5000 sentinel client-reconfig-script mymaster /usr/local/redis/conf/reconfig.sh 分别在主，从上启动 sentinel redis-sentinel /usr/local/redis/conf/sentinel.conf 查看哨兵状态 redis-cli -h 192.168.1.41 -p 26379 info sentinel
四、客户端兼容问题
客户端程序（如PHP程序）连接redis时需要ip和port，但redis-server进行故障转移时，主数据库是变化的，所以ip地址也是变化的，客户端程序如何感知当前主redis的ip地址和端口呢？
redis-sentinel提供了接口，请求任何一个sentinel，发送SENTINEL get-master-addr-by-name
解决方案：
增加配置切换脚本 sentinel.conf，当主数据库服务宕机时，实现VIP漂移自动切换主从。
sentinel client-reconfig-script mymaster /usr/local/redis/conf/reconfig.sh
#!/bin/bash
#mymaster leader start 192.168.1.41 6379 192.168.1.42 6379
VIP="192.168.1.40/24"
local_ip=$(ip addr show dev eth0 |awk '$1=="inet"{print $2}')
if [[ "${local_ip%%/*}" == "$4" ]];then
/usr/sbin/ifconfig eth0:1 down
elif [[ "${local_ip%%/*}" == "$6" ]];then
/usr/sbin/ifconfig eth0:1 "${VIP}"
fi相关推荐：
thinkphp5中belongsToMany() 模块名称的命名问题解决
php中文网学习专题：php session （包含图文、视频、案例）
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