Redis Sentinel usage and configuration in Laravel

Master-slave configuration(master-slave)

• Copy the redis configuration file to open multiple slaves

sudo cp / etc/redis.conf /etc/redis-6381.conf

sudo cp /etc/redis.conf /etc/redis-6382.conf

• Edit the slave configuration file, mainly Modify parameters

port 6381

pidfile "/var/run/redis-6381.pid"

logfile "/var/log/redis/redis-6381.log"

slaveof 11.11.11.11 6381

masterauth "123456" # 主从都保持一样的密码，且 master 的配置也需要这一行，在执行切换 master 的时候好像不会去添加这一行

• /usr/bin/redis-server /etc/redis.conf Start redis through configuration

Sentinel configuration(sentinel)

• Copy the sentinel configuration, enable 3 sentinels here

sudo cp /etc/redis-sentinel.conf /etc/redis-sentinel-26381.conf

sudo cp / etc/redis-sentinel.conf /etc/redis-sentinel-26382.conf

• Edit the sentinel configuration file, mainly modify the parameters as follows, configure according to the specific situation

port 26381

pidfile "/var/run/redis-sentinel-26381.pid"

logfile "/var/log/redis/redis-sentinel-26381.log"

sentinel monitor mymaster 11.11.11.11 6379 2 #主节点别名为mymaster，后面是ip和端口，2代表判断主节点失败至少需要2个sentinel节点同意

sentinel auth-pass mymaster 123456

sentinel down-after-milliseconds mymaster 30000 #主节点故障30秒后启用新的主节点

sentinel parallel-syncs mymaster 1 #故障转移时最多可以有1个从节点同时对主节点进行数据同步，数字越大，用时越短，存在网络和 IO 开销

sentinel failover-timeout mymaster 180000 #故障转移超时时间180s：a 如果转移超时失败，下次转移时时间为之前的2倍；b 从节点变主节点时，从节点执行 slaveof no one 命令一直失败的话，当时间超过180S时，则故障转移失败；c 从节点复制新主节点时间超过180S转移失败

• /usr/bin/redis-sentinel /etc/redis-sentinel.conf Start the sentinel through configuration

laravel sentinel configuration

'default' => [
            'tcp://11.11.11.11:26379',
            'tcp://11.11.11.11:26381',
            'tcp://11.11.11.11:26382',    //这3个都是sentinel节点的地址
            'options' => [
                'replication' => 'sentinel',
                'service'     => env('REDIS_SENTINEL_SERVICE', 'mymaster'),    //sentinel
                'parameters'  => [
                    'host'     => env('REDIS_HOST', '127.0.0.1'),
                    'port'     => env('REDIS_PORT', 6379),
                    'password' => env('REDIS_PASSWORD', null),    //redis的密码,没有时写null
                    'database' => 0,
                ],
            ],
        ]

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