20年第45周：docker部署Redis集群

一、使用脚本搭建Redis集群

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二、使用脚本搭建Redis容器集群

创建步骤

• ①创建一个docker redis子网

docker create network redis-net

• ②创建多个Redis容器：像搭建一个redis容器一样重复N次，并制定网络为上述①的子网

PS: 此时创建的仍是单机Redis
参考：[20年第45周：docker安装/部署/使用redis (Redis 配置)]
(https://www.jianshu.com/p/3e89597d6272)

• 配置模板redis-cluster.tmpl

port ${PORT}
protected-mode no
cluster-enabled yes
cluster-config-file nodes.conf
cluster-node-timeout 5000
cluster-announce-ip 172.18.0.2  # docker创建的子网，后面要改的随便写
cluster-announce-port ${PORT}
cluster-announce-bus-port 1${PORT}
appendonly yes

• 批量创建redis.conf配置的脚本

for port in `seq 9000 9005`; do \
  mkdir -p ./${port}/conf \
  && PORT=${port} envsubst < ./redis-cluster.tmpl > ./${port}/conf/redis.conf \
  && mkdir -p ./${port}/data; \
done

什么是envsubst？>>参考envsubst

• 批量创建Redis容器的脚本

 for port in `seq 9000 9005`; do \
docker run -d -ti -p ${port}:${port} -p 1${port}:1${port} \
-v /Users/xusanhuo/data/redis-cluster/${port}/conf/redis.conf:/etc/redis/redis.conf \
-v /Users/xusanhuo/data/redis-cluster/${port}/data:/data \
--restart always --name redis-${port} --net redis-net \
--sysctl net.core.somaxconn=1024 redis redis-server /etc/redis/redis.conf; \
done

• 生成集群创建命令的脚本

PS: 这个脚本要在本②中所创建的6个容器实例里面的任意一个内执行既可docker exec -it redis-9000 bash

IP=2 ;\
PORT=0 ;\
CLUSTER_HOST=172.18.0. ;\  # 这里填写你通过`docker inspect network redis-net`看到的子网
for i in `seq 0 5`; do \
  IP=$((IP+${i})) ;\
  PORT=$((9000+${i})) ;\
  HOSTS="$HOSTS $CLUSTER_HOST$IP:$PORT" ;\
done; \
echo $HOSTS ;\
redis-cli --cluster create $HOSTS --cluster-replicas 1

• ③集群联网：创建一个集群，并将多个Redis容器挂载到容器集群上。

PS: 通过此步骤，将上述②中创建Redis实例挂载到集群上。

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三、参考资料

• Redis集群搭建手册
• create-cluster.sh文件内容
  
  

  image.png

#!/bin/bash

# Settings
BIN_PATH="../../src/"
CLUSTER_HOST=127.0.0.1
PORT=30000
TIMEOUT=2000
NODES=6
REPLICAS=1
PROTECTED_MODE=yes
ADDITIONAL_OPTIONS=""

# You may want to put the above config parameters into config.sh in order to
# override the defaults without modifying this script.

if [ -a config.sh ]
then
    source "config.sh"
fi

# Computed vars
ENDPORT=$((PORT+NODES))

if [ "$1" == "start" ]
then
    while [ $((PORT < ENDPORT)) != "0" ]; do
        PORT=$((PORT+1))
        echo "Starting $PORT"
        $BIN_PATH/redis-server --port $PORT  --protected-mode $PROTECTED_MODE --cluster-enabled yes --cluster-config-file nodes-${PORT}.conf --cluster-node-timeout $TIMEOUT --appendonly yes --appendfilename appendonly-${PORT}.aof --dbfilename dump-${PORT}.rdb --logfile ${PORT}.log --daemonize yes ${ADDITIONAL_OPTIONS}
    done
    exit 0
fi

if [ "$1" == "create" ]
then
    HOSTS=""
    while [ $((PORT < ENDPORT)) != "0" ]; do
        PORT=$((PORT+1))
        HOSTS="$HOSTS $CLUSTER_HOST:$PORT"
    done
    $BIN_PATH/redis-cli --cluster create $HOSTS --cluster-replicas $REPLICAS
    exit 0
fi

if [ "$1" == "stop" ]
then
    while [ $((PORT < ENDPORT)) != "0" ]; do
        PORT=$((PORT+1))
        echo "Stopping $PORT"
        $BIN_PATH/redis-cli -p $PORT shutdown nosave
    done
    exit 0
fi

if [ "$1" == "watch" ]
then
    PORT=$((PORT+1))
    while [ 1 ]; do
        clear
        date
        $BIN_PATH/redis-cli -p $PORT cluster nodes | head -30
        sleep 1
    done
    exit 0
fi

if [ "$1" == "tail" ]
then
    INSTANCE=$2
    PORT=$((PORT+INSTANCE))
    tail -f ${PORT}.log
    exit 0
fi

if [ "$1" == "tailall" ]
then
    tail -f *.log
    exit 0
fi

if [ "$1" == "call" ]
then
    while [ $((PORT < ENDPORT)) != "0" ]; do
        PORT=$((PORT+1))
        $BIN_PATH/redis-cli -p $PORT $2 $3 $4 $5 $6 $7 $8 $9
    done
    exit 0
fi

if [ "$1" == "clean" ]
then
    rm -rf *.log
    rm -rf appendonly*.aof
    rm -rf dump*.rdb
    rm -rf nodes*.conf
    exit 0
fi

if [ "$1" == "clean-logs" ]
then
    rm -rf *.log
    exit 0
fi

echo "Usage: $0 [start|create|stop|watch|tail|clean|call]"
echo "start       -- Launch Redis Cluster instances."
echo "create      -- Create a cluster using redis-cli --cluster create."
echo "stop        -- Stop Redis Cluster instances."
echo "watch       -- Show CLUSTER NODES output (first 30 lines) of first node."
echo "tail    -- Run tail -f of instance at base port + ID."
echo "tailall     -- Run tail -f for all the log files at once."
echo "clean       -- Remove all instances data, logs, configs."
echo "clean-logs  -- Remove just instances logs."
echo "call   -- Call a command (up to 7 arguments) on all nodes."