redis哨兵搭建

环境介绍

安装redis（三台服务器执行）

• 安装redis需要用到的依赖

  yum -y install wget gcc gcc-c++

• 下载redis源码包（本文档用的是5.0.5版本。可以根据自己的需要选择对应的版本）

下载地址

    cd /usr/local/
    mkdir redis
    cd redis
    wget http://download.redis.io/releases/redis-5.0.5.tar.gz

• 安装redis依次执行以下命令

    cd /usr/local/redis/
    tar xf redis-5.0.5.tar.gz
    mv redis-5.0.5 redis
    cd redis
    make
    cd src/
    make install

部署redis主从

• 修改主节点的redis配置文件内对应的配置项（把配置文件的bind配置项全部注释掉）

    protected-mode yes
    port 6379
    tcp-backlog 511
    timeout 0
    tcp-keepalive 300
    daemonize yes
    supervised no
    pidfile "/var/run/redis_6379.pid"
    loglevel notice
    logfile "/usr/local/redis/redis/redis.log"
    databases 16
    always-show-logo yes
    save 900 1
    save 300 10
    save 60 10000
    stop-writes-on-bgsave-error yes
    rdbcompression yes
    rdbchecksum yes
    dbfilename "dump.rdb"
    dir "/usr/local/redis/redis/src"
    masterauth "Pactera@sln_idsc8888"
    replica-serve-stale-data yes
    replica-read-only yes
    repl-diskless-sync no
    repl-diskless-sync-delay 5
    repl-disable-tcp-nodelay no
    replica-priority 100
    requirepass "Pactera@sln_idsc8888"
    lazyfree-lazy-eviction no
    lazyfree-lazy-expire no
    lazyfree-lazy-server-del no
    replica-lazy-flush no
    appendonly no
    appendfilename "appendonly.aof"
    appendfsync everysec
    no-appendfsync-on-rewrite no
    auto-aof-rewrite-percentage 100
    auto-aof-rewrite-min-size 64mb
    aof-load-truncated yes
    aof-use-rdb-preamble yes
    lua-time-limit 5000
    slowlog-log-slower-than 10000
    slowlog-max-len 128
    latency-monitor-threshold 0
    notify-keyspace-events ""
    hash-max-ziplist-entries 512
    hash-max-ziplist-value 64
    list-max-ziplist-size -2
    list-compress-depth 0
    set-max-intset-entries 512
    zset-max-ziplist-entries 128
    zset-max-ziplist-value 64
    hll-sparse-max-bytes 3000
    stream-node-max-bytes 4096
    stream-node-max-entries 100
    activerehashing yes
    client-output-buffer-limit normal 0 0 0
    client-output-buffer-limit replica 256mb 64mb 60
    client-output-buffer-limit pubsub 32mb 8mb 60
    hz 10
    dynamic-hz yes
    aof-rewrite-incremental-fsync yes
    rdb-save-incremental-fsync yes

• 修改两台从节点的配置文件

    protected-mode yes
    port 6379   #redis端口
    tcp-backlog 511
    timeout 0
    tcp-keepalive 300
    daemonize yes
    supervised no
    pidfile "/var/run/redis_6379.pid"  #redis的pid目录
    loglevel notice
    logfile "/usr/local/redis/redis/redis.log"   #redis的日志路径
    databases 16
    always-show-logo yes
    save 900 1
    save 300 10
    save 60 10000
    stop-writes-on-bgsave-error yes
    rdbcompression yes
    rdbchecksum yes
    dbfilename "dump.rdb"
    dir "/usr/local/redis/redis/src"  #redis的文件存放路径
    masterauth "Pactera@sln_idsc8888" #主节点redis密码
    slaveof 172.27.0.6 6379 #主节点的redis的IP和端口号
    replica-serve-stale-data yes
    replica-read-only yes
    repl-diskless-sync no
    repl-diskless-sync-delay 5
    repl-disable-tcp-nodelay no
    replica-priority 100
    requirepass "Pactera@sln_idsc8888" #redis密码
    lazyfree-lazy-eviction no
    lazyfree-lazy-expire no
    lazyfree-lazy-server-del no
    replica-lazy-flush no
    appendonly no
    appendfilename "appendonly.aof"
    appendfsync everysec
    no-appendfsync-on-rewrite no
    auto-aof-rewrite-percentage 100
    auto-aof-rewrite-min-size 64mb
    aof-load-truncated yes
    aof-use-rdb-preamble yes
    lua-time-limit 5000
    slowlog-log-slower-than 10000
    slowlog-max-len 128
    latency-monitor-threshold 0
    notify-keyspace-events ""
    hash-max-ziplist-entries 512
    hash-max-ziplist-value 64
    list-max-ziplist-size -2
    list-compress-depth 0
    set-max-intset-entries 512
    zset-max-ziplist-entries 128
    zset-max-ziplist-value 64
    hll-sparse-max-bytes 3000
    stream-node-max-bytes 4096
    stream-node-max-entries 100
    activerehashing yes
    client-output-buffer-limit normal 0 0 0
    client-output-buffer-limit replica 256mb 64mb 60
    client-output-buffer-limit pubsub 32mb 8mb 60
    hz 10
    dynamic-hz yes
    aof-rewrite-incremental-fsync yes
    rdb-save-incremental-fsync yes

依次启动主从节点的redis

    cd /usr/local/redis/redis/src
    ./redis-server ../redis.conf

• 可以查看集群节点状态

    cd /usr/local/redis/redis/src
    ./redis-cli #进入redis交互页面
        auth Pactera@sln_idsc8888 #验证密码，相当于登录
        info replication #查看集群状态
        从节点状态为
            # Replication
            role:slave
            master_host:172.27.0.12
            master_port:6379
            master_link_status:up
            master_last_io_seconds_ago:0
            master_sync_in_progress:0
            slave_repl_offset:1564382
            slave_priority:100
            slave_read_only:1
            connected_slaves:0
            master_replid:08625e5978c2d46d811693357f02a0a79f83f2cd
            master_replid2:01ce73d6819d27635317afc0edcc65de51d4213f
            master_repl_offset:1564382
            second_repl_offset:57711
            repl_backlog_active:1
            repl_backlog_size:1048576
            repl_backlog_first_byte_offset:515807
            repl_backlog_histlen:1048576
        主节点状态为：
            # Replication
            role:master
            connected_slaves:2
            slave0:ip=172.27.0.6,port=6379,state=online,offset=1574975,lag=0
            slave1:ip=172.27.0.14,port=6379,state=online,offset=1574839,lag=1
            master_replid:08625e5978c2d46d811693357f02a0a79f83f2cd
            master_replid2:01ce73d6819d27635317afc0edcc65de51d4213f
            master_repl_offset:1575112
            second_repl_offset:57711
            repl_backlog_active:1
            repl_backlog_size:1048576
            repl_backlog_first_byte_offset:526537
            repl_backlog_histlen:1048576

至此redis主从节搭建完成，可以开始启用哨兵服务

部署哨兵服务所有节点配置

• 修改哨兵配置文件

    protected-mode no
    port 26379  #哨兵服务使用的端口
    daemonize yes
    pidfile "/usr/local/redis/redis/sentinel/run/redis-sentinel.pid"  #哨兵服务的PID文件路径
    logfile "/usr/local/redis/redis/sentinel/log/sentinel.log"  #哨兵服务的日志存放路径
    dir "/usr/local/redis/redis/sentinel/data"  #哨兵服务的文件存放路劲
    sentinel myid 48945806fd5919282819b90179793b6b7955cf7d  #myid每台服务器都有不同的ID不可直接修改，启动后会自己生成，没启动的情况下配置文件内找不到配置项
    sentinel deny-scripts-reconfig yes
    sentinel monitor mymaster 172.27.0.6 6379 2  #主节点redis的IP和端口，2表示当集群中的两个或两个以上的哨兵认为主节点的redis不可用的情况下才会选举新的主节点
    sentinel auth-pass mymaster Pactera@sln_idsc8888 #主节点redis的密码

• 启动所有节点的哨兵

    cd /usr/local/redis/redis/src/
    ./redis-sentinel ../sentinel.conf 

• 可以查看sentinel的日志是否有报错，如果无报错则说明启动成功可以进行测试，测试时把当前主从的主节点kill掉，然后查看是否会选举新从节点为主节点，如果可以切换，则说明哨兵搭建成功。切换大概有一分钟左右延时