Redis Cluster搭建和开机自启设置

向右看齐 2022-11-15 04:59 461阅读 0赞

# 一、前言  #

redis最开始使用主从模式做集群，若master宕机需要手动配置slave转为master；后来为了高可用提出来**哨兵**模式，该模式下有一个哨兵监视master和slave，若master宕机可自动将slave转为master，但它也有一个问题，就是不能动态扩充；所以在3.x提出cluster集群模式。

redis从3.0开始支持集群功能。redis集群采用无中心节点方式实现，无需proxy代理，客户端直接与redis集群的每个节点连接，根据同样的hash算法计算出key对应的slot，然后直接在slot对应的redisj节点上执行命令。在redis看来，响应时间是最苛刻的条件，增加一层带来的开销是redis不能接受的。因此，redis实现了客户端对节点的直接访问，为了去中心化，节点之间通过gossip协议交换互相的状态，以及探测新加入的节点信息。redis集群支持动态加入节点，动态迁移slot，以及自动故障转移。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxMTUzNjE5_size_16_color_FFFFFF_t_70][]

# 二、 环境准备 #

**以下所有节点均相同操作**

### **1、机器准备** ###

172.8.10.105 siger-data1.test.com    7000、7001端口

172.8.10.106 siger-data2.test.com    7002、7003端口

172.8.10.107 siger-data2.test.com    7004、7005端口

### **2****、关闭防火墙** ###

sudo systemctl stop firewalld.service && sudo systemctl disable firewalld.service

sudo systemctl status firewalld.service

### **3****、修改系统内核参数** ###

echo "vm.overcommit\_memory = 1" >> /etc/sysctl.conf

echo "net.core.somaxconn = 512" >> /etc/sysctl.conf

### **4****、下载环境依赖** ###

yum -y install cpp binutils glibc glibc-kernheaders glibc-common glibc-devel gcc make gcc-c++ libstdc++-devel tcl

### **5****、解压安装包** ###

mkdir /usr/local/redis

mv /opt/redis-6.0.6.tar.gz /usr/local/redis/

tar -zxvf redis-6.0.6.tar.gz

**6、升级gcc**

（默认的只支持redis 6.0.以下，安装6.0.6需要升级gcc）

yum -y install centos-release-scl  
yum -y install devtoolset-9-gcc devtoolset-9-gcc-c++ devtoolset-9-binutils scl enable devtoolset-9 bash

\# 查看版本

gcc -v

![20210331091408767.png][]

# 三、搭建 #

### **1、编译并安装** ###

**172.8.10.105：**

make PREFIX=/usr/local/redis install

![20210331091416637.png][]

### **2、创建配置目录** ###

**172.8.10.105：**

mkdir -p /usr/local/redis/\{data,etc,log\}

### **3、分发其他节点** ###

**172.8.10.105：**

scp -r /usr/local/redis/ [root@172.8.10.106:/usr/local][root_172.8.10.106_usr_local]

scp -r /usr/local/redis/ root@172.8.10.107:/usr/local

### **4、修改配置文件** ###

**（注意区分ip和端口）**

**172.8.10.105：**

vim /usr/local/redis/etc/7000.conf

vim /usr/local/redis/etc/7001.conf

**172.8.10.106：**

vim /usr/local/redis/etc/7002.conf

vim /usr/local/redis/etc/7003.conf

**172.8.10.107：**

vim /usr/local/redis/etc/7004.conf

vim /usr/local/redis/etc/7005.conf

**以下是7000.conf，其他7001-7005照样修改**

bind 172.8.10.105
    protected-mode yes
    port 7000
    tcp-backlog 511
    timeout 0
    tcp-keepalive 300
    daemonize yes
    supervised no
    pidfile /var/run/7000.pid
    loglevel notice
    logfile "/usr/local/redis/log/7000.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 7000-dump.rdb
    rdb-del-sync-files no
    dir /usr/local/redis/data/
    replica-serve-stale-data yes
    replica-read-only yes
    repl-diskless-sync no
    repl-diskless-sync-delay 5
    repl-diskless-load disabled
    repl-disable-tcp-nodelay no
    replica-priority 100
    acllog-max-len 128
    lazyfree-lazy-eviction no
    lazyfree-lazy-expire no
    lazyfree-lazy-server-del no
    replica-lazy-flush no
    lazyfree-lazy-user-del no
    appendonly no
    appendfilename "7000-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
    cluster-enabled yes
    cluster-config-file 7000.conf
    cluster-node-timeout 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
    jemalloc-bg-thread yes

\#安装tree

sudo yum -y install tree

\# 查看目录

tree /usr/local/redis/

**172.8.10.105：**

![20210331091513305.png][]

**172.8.10.106：**

![20210331091531367.png][]

**172.8.10.107：**

![20210331091536535.png][]

### **4、启动各节点** ###

**172.8.10.105：**

/usr/local/redis/bin/redis-server /usr/local/redis/etc/7000.conf

/usr/local/redis/bin/redis-server /usr/local/redis/etc/7001.conf

ps -aux | grep redis

![20210331092708240.png][]

**172.8.10.106：**

/usr/local/redis/bin/redis-server /usr/local/redis/etc/7002.conf

/usr/local/redis/bin/redis-server /usr/local/redis/etc/7003.conf

![20210331092714987.png][]

**172.8.10.107：**

/usr/local/redis/bin/redis-server /usr/local/redis/etc/7004.conf

/usr/local/redis/bin/redis-server /usr/local/redis/etc/7005.conf

![20210331092721411.png][]

### **5****、创建redis集群** ###

**\#****任意节点：**

/usr/local/redis/bin/redis-cli --cluster create 172.8.10.105:7000 172.8.10.105:7001 172.8.10.106:7002 172.8.10.106:7003 172.8.10.107:7004 172.8.10.107:7005 --cluster-replicas 1

\#集群启动成功

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxMTUzNjE5_size_16_color_FFFFFF_t_70 1][]

**注：**

–cluster-replicas 1：表示希望为集群中的每个主节点创建一个从节点(一主一从)。

–cluster-replicas 2：表示希望为集群中的每个主节点创建两个从节点(一主二从)。

### **6、验证集群** ###

./redis-cli -c -p 7005 -h 172.8.10.107

![20210331093137627.png][]

![20210331093137683.png][]

![20210331093137680.png][]

![20210331093137708.png][]

![20210331093137707.png][]

![20210331093137710.png][]

# **四、开机自启** #

**以下所有节点均相同操作**

\#设置脚本

vim /etc/init.d/redisc

（将redisc\_node1、redisc\_node2、redisc\_node3的内容分别复制在不同的节点/etc/init.d/redisc上）

**以下是redisc\_node1****，其他照样修改**

#!/bin/sh
    # chkconfig: 2345 80 90
    #
    # Simple Redis init.d script conceived to work on Linux systems
    # as it does use of the /proc filesystem.
    
    REDISPORT1=7000
    REDISPORT2=7001
    EXEC=/usr/local/redis/bin/redis-server
    CLIEXEC=/usr/local/redis/bin/redis-cli
    
    PIDFILE=/var/run/${REDISPORT1}.pid
    
    CONF1="/usr/local/redis/etc/${REDISPORT1}.conf"
    CONF2="/usr/local/redis/etc/${REDISPORT2}.conf"
    
    case "$1" in
        start)
            if [ -f $PIDFILE ]
            then
                    echo "$PIDFILE exists, process is already running or crashed"
            else
                    echo "Starting Redis cluster server..."
                    $EXEC $CONF1 &
                    $EXEC $CONF2 &
                    echo "启动成功..."
            fi
            ;;
        stop)
            if [ ! -f $PIDFILE ]
            then
                    echo "$PIDFILE does not exist, process is not running"
            else
                    PID=$(cat $PIDFILE)
                    echo "Stopping ..."
                    $CLIEXEC -p $REDISPORT1 shutdown
                    $CLIEXEC -p $REDISPORT2 shutdown
                    while [ -x /proc/${PID} ]
                    do
                        echo "Waiting for Redis cluster to shutdown ..."
                        sleep 1
                    done
                    echo "Redis cluster stopped"
            fi
            ;;
        *)
            echo "Please use start or stop as first argument"
            ;;
    esac

\#设置权限

chmod +x /etc/init.d/redisc

注册为系统服务

chkconfig --add redisc

以后可以使用命令来控制Redis的启动和关闭

启动：service redisc start

关闭：service redisc stop

配置为开机自启动

chkconfig redisc on

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[20210331091408767.png]: https://img-blog.csdnimg.cn/20210331091408767.png
[20210331091416637.png]: https://img-blog.csdnimg.cn/20210331091416637.png
[root_172.8.10.106_usr_local]: mailto:root@172.8.10.106:/usr/local
[20210331091513305.png]: https://img-blog.csdnimg.cn/20210331091513305.png
[20210331091531367.png]: https://img-blog.csdnimg.cn/20210331091531367.png
[20210331091536535.png]: https://img-blog.csdnimg.cn/20210331091536535.png
[20210331092708240.png]: https://img-blog.csdnimg.cn/20210331092708240.png
[20210331092714987.png]: https://img-blog.csdnimg.cn/20210331092714987.png
[20210331092721411.png]: https://img-blog.csdnimg.cn/20210331092721411.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxMTUzNjE5_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20210331092759985.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxMTUzNjE5,size_16,color_FFFFFF,t_70
[20210331093137627.png]: https://img-blog.csdnimg.cn/20210331093137627.png
[20210331093137683.png]: https://img-blog.csdnimg.cn/20210331093137683.png
[20210331093137680.png]: https://img-blog.csdnimg.cn/20210331093137680.png
[20210331093137708.png]: https://img-blog.csdnimg.cn/20210331093137708.png
[20210331093137707.png]: https://img-blog.csdnimg.cn/20210331093137707.png
[20210331093137710.png]: https://img-blog.csdnimg.cn/20210331093137710.png