docker redis4.0 集群（cluster）搭建

#安装所需的软件包
yum install -y yum-utils \
  device-mapper-persistent-data \
  lvm2

#设置稳定的存储库
yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo

#安装docker ce(docker社区版)
yum install docker-ce

#启动docker
systemctl start docker

#获取redis镜像（最新版为4.0.9）
docker pull redis

#在docker库获取ruby镜像
docker pull ruby

#创建集群目录
mkdir /opt/cluster/redis

cd /opt/cluster/redis

#创建模板文件redis-cluster.tmpl，内容如下
port ${PORT}
cluster-enabled yes
cluster-config-file nodes.conf
cluster-node-timeout 10000
cluster-announce-ip 123.*.*.*
cluster-announce-port ${PORT}
cluster-announce-bus-port 1${PORT}
appendonly yes

#生成conf和data目标，并生成配置信息
for port in `seq 6370 6375`; do \
  mkdir -p ./${port}/conf \
  && PORT=${port} envsubst < ./redis-cluster.tmpl > ./${port}/conf/redis.conf \
  && mkdir -p ./${port}/data; \
done

#创建6个redis容器
for port in `seq 6370 6375`; do \
  docker run -d -ti -p ${port}:${port} -p 1${port}:1${port} \
  -v /opt/cluster/redis/${port}/conf/redis.conf:/usr/local/etc/redis/redis.conf \
  -v /opt/cluster/redis/${port}/data:/data \
  --restart always --name redis-${port} --net bridge \
  -m 100M --memory-swap=100M -h redis${port} \
  --sysctl net.core.somaxconn=1024 redis redis-server /usr/local/etc/redis/redis.conf; \
done


#通过启动ruby来实现集群
echo yes | docker run -i --rm --net bridge ruby sh -c '\
  gem install redis \
  && wget http://download.redis.io/redis-stable/src/redis-trib.rb \
  && ruby redis-trib.rb create --replicas 1 \
  '"$(for port in `seq 6370 6375`; do \
    echo -n "$(docker inspect --format '{{ (index .NetworkSettings.Networks "bridge").IPAddress }}' "redis-${port}")":${port} ' ' ; \
  done)"