Redis集群搭建

2017-10-26  本文已影响22人  己乙孔

0. 环境准备

操作系统版本：CentOS 6.9
Redis版本：redis-3.2.11

如果路径不存在，请创建，或使用自定义路径
安装包路径：/usr/local/src
Redis程序路径：/usr/local/redis
Redis配置文件路径：/usr/local/redis/conf
Redis日志文件路径：/var/log/redis

1. 安装Redis

编译安装

# 解压源码包
cd /usr/local/src
tar xzvf redis-3.2.11.tar.gz
cd redis-3.2.11
# 编译并安装
make PREFIX=/usr/local/redis install
make test # 可以不执行这步

如果编译时有如下报错时，添加参数"MALLOC=libc"

zmalloc.h:50:31: error: jemalloc/jemalloc.h: No such file or directory
zmalloc.h:55:2: error: #error "Newer version of jemalloc required"

make PREFIX=/usr/local/redis MALLOC=libc install

添加redis文件夹至系统环境变量

# 添加redis可执行文件所在文件夹至系统路径
vi /etc/profile
# 最后添加下面一行
export PATH=/usr/local/redis/bin:$PATH
# 即时生效环境变量
source /etc/profile

添加Redis为系统服务

# 使用Redis自带的安装脚本
cd /usr/local/src/redis-3.2.11/utils
./install_server.sh

# 下面是运行过程及结果
Welcome to the redis service installer
This script will help you easily set up a running redis server

Please select the redis port for this instance: [6379] 6378
Please select the redis config file name [/etc/redis/6378.conf] /usr/local/redis/conf/6378/6378.conf
Please select the redis log file name [/var/log/redis_6378.log] /var/log/redis/6480.log
Please select the data directory for this instance [/var/lib/redis/6378] /usr/local/redis/conf/6378
Please select the redis executable path [/usr/local/redis/bin/redis-server] 
Selected config:
Port          : 6378
Config file   : /usr/local/redis/conf/6378/6378.conf
Log file      : /var/log/redis/6480.log
Data dir      : /usr/local/redis/conf/6378
Executable    : /usr/local/redis/bin/redis-server
Cli Executable : /usr/local/redis/bin/redis-cli
Is this ok? Then press ENTER to go on or Ctrl-C to abort.
Copied /etc/6378.conf => /etc/init.d/redis_6378
Installing service...
Successfully added to chkconfig!
Successfully added to runlevels 345!
Starting Redis server...
Installation successful!

2. 创建Redis集群

集群命令

# 复制集群创建命令至Redis
cp /usr/local/src/redis/src/redis-trib.rb /usr/local/redis/bin

集群配置文件

cp /usr/local/src/redis/redis.conf /usr/local/redis/conf/6378.conf
cp /usr/local/src/redis/redis.conf /usr/local/redis/conf/6379.conf
cp /usr/local/src/redis/redis.conf /usr/local/redis/conf/6380.conf
cp /usr/local/src/redis/redis.conf /usr/local/redis/conf/6478.conf
cp /usr/local/src/redis/redis.conf /usr/local/redis/conf/6479.conf
cp /usr/local/src/redis/redis.conf /usr/local/redis/conf/6480.conf

此处主要列举需要更改的配置项，其余可使用默认选项

daemonize yes
pidfile /var/run/redis-6378.pid  
port 6378
protected-mode no
# 可以指定IP，如果不清楚IP来源，可以直接注释掉 
# bind 127.0.0.1
logfile /var/logs/redis/redis-6378.log
dbfilename /usr/local/redis/conf/dump-6378.rdb
dir /usr/local/redis/conf
appendonly yes
appendfilename /usr/local/redis/conf/appendonly-6378.aof
cluster-enabled yes
cluster-config-file /usr/local/redis/conf/nodes-6380.conf

创建集群

因为创建Redis集群时，需要用到Redis，确认环境中是否已安装Redis，没有则需要安装

# 安装相关包，也可使用源码安装ruby，本文使用yum方式
yum install ruby ruby-devel rubygems
gem install redis
# 本地安装包使用gem install -l redis-4.0.1.gem

# 集群不能指定从redis服务，即slaveof选项无效
# 创建集群前，先不启用密码策略，即注释掉requirepass，可以将protected-mode改为no
# 集群需开启持续化，appendonly改为yes
# 选项 --replicas 1 表示集群中的每个主节点有一个从节点
# Redis集群至少3个主节点，每台主节点至少有1个从节点，即至少需要6个节点
redis-trib.rb  create --replicas 1 192.168.5.100:6378 192.168.5.100:6379 192.168.5.100:6380 192.168.5.100:6478 192.168.5.100:6479 192.168.5.100:6480

有两种方式，更改配置文件和命令行

# 1. 更改配置文件（需要重启服务）
# 配置文件中的更改为下列选项
# 每个节点都需更改
protected-mode yes
masterauth "your-password"
requirepass "your-password"

# 2. 命令行（无需重启服务），推荐该方式
# 每个节点都要执行一遍
redis-cli -c -p 6378
> config set protected-mode yes
> config set masterauth your-password
> config set requirepass your-password
> auth your-password
> config rewrite
> exit

密码设置完成后，添加密码验证至Redis服务

vim /etc/init.d/redis_6378
# 在第4行添加如下行，从配置文件获取密码
# "awk -F"后的顺序是单引号双引号单引号
AUTH=$(grep ^requirepass $CONF | awk -F '"' '{print $2}')
# 添加"-a"密码认证选项
$CLIEXEC -a $AUTH -p $REDISPORT shutdown # 如果设置了密码认证

完整的redis_6378代码如下：

#!/bin/sh
#Configurations injected by install_server below....

AUTH=$(grep ^requirepass $CONF | awk -F '"' '{print $2}')
EXEC=/usr/local/redis/bin/redis-server
CLIEXEC=/usr/local/redis/bin/redis-cli
PIDFILE=/var/run/redis_6378.pid
CONF="/usr/local/redis/conf/6378/6378.conf"
REDISPORT="6279"
###############
# SysV Init Information
# chkconfig: - 58 74
# description: redis_${REDIS_PORT} is the redis daemon.
### BEGIN INIT INFO
# Provides: redis_${REDIS_PORT}
# Required-Start: \$network \$local_fs \$remote_fs
# Required-Stop: \$network \$local_fs \$remote_fs
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Should-Start: \$syslog \$named
# Should-Stop: \$syslog \$named
# Short-Description: start and stop redis_${REDIS_PORT}
# Description: Redis daemon
### END INIT INFO


case "$1" in
    start)
        if [ -f $PIDFILE ]
        then
            echo "$PIDFILE exists, process is already running or crashed"
        else
            echo "Starting Redis server..."
            $EXEC $CONF
        fi
        ;;
    stop)
        if [ ! -f $PIDFILE ]
        then
            echo "$PIDFILE does not exist, process is not running"
        else
            PID=$(cat $PIDFILE)
            echo "Stopping ..."
            $CLIEXEC -a $AUTH -p $REDISPORT shutdown
            while [ -x /proc/${PID} ]
            do
                echo "Waiting for Redis to shutdown ..."
                sleep 1
            done
            echo "Redis stopped"
        fi
        ;;
    status)
        PID=$(cat $PIDFILE)
        if [ ! -x /proc/${PID} ]
        then
            echo 'Redis is not running'
        else
            echo "Redis is running ($PID)"
        fi
        ;;
    restart)
        $0 stop
        $0 start
        ;;
    *)
        echo "Please use start, stop, restart or status as first argument"
        ;;
esac

3. 验证Redis集群

# 如果不在本机上，可以使用-h选项加上远程IP地址
redis-cli -c -p 6378
127.0.0.1:6378> auth your-password
127.0.0.1:6378> cluster nodes
127.0.0.1:6378> cluster info

附录： Redis配置文件详解

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