Docker compose部署Redis Cluster

环境准备：

安装Docker和docker-compose

安装docker-ce：

# 移除旧版本
sudo yum remove docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-engine
		  
# 配置仓库
sudo yum install -y yum-utils device-mapper-persistent-data lvm2
#官方源
#sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
#阿里云源
sudo yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
sudo yum makecache fast

# 检查可安装的版本
yum list docker-ce --showduplicates | sort -r

# 安装指定版本
#sudo yum install docker-ce-<VERSION_STRING> docker-ce-cli-<VERSION_STRING> containerd.io docker-buildx-plugin docker-compose-plugin
yum install -y docker-ce-25.0.1 docker-ce-cli-25.0.1 containerd.io docker-buildx-plugin docker-compose-plugin

# 启动
sudo systemctl enable docker
sudo systemctl start docker		  

配置阿里云镜像源:

cat > /etc/docker/daemon.json << EOF
{
 "registry-mirrors" : ["https://b9pmyelo.mirror.aliyuncs.com"]
}
EOF

sudo systemctl restart docker

🐬Docker社区版部署参见：

• https://docs.docker.com/engine/install/centos/
• https://gottdeskrieges.blog.csdn.net/article/details/113242029

安装docker-compose：

curl -SL https://github.com/docker/compose/releases/download/v2.24.6/docker-compose-linux-x86_64 -o /usr/local/bin/docker-compose

chmod 755 /usr/local/bin/docker-compose

📖参考：https://docs.docker.com/compose/install/standalone/

准备docker-compose文件

• Redis版本：7.2.4
• Redis安装路径：/opt/docker-compose/redis

准备单台服务的compose文件，每台服务器上部署两个Redis实例（服务端口分别为6379和6380）和一个redis exporter。容器网络采用仅主机模式。

version: '3'

services:
  redis-server-6379:
    image: redis:7.2.4
    network_mode: host
    container_name: redis-server-6379
    restart: unless-stopped
    #ports:
    #  - 6379:6379
    environment:
      TZ: "Asia/Shanghai"
    command: ["/6379/conf/redis.conf"]
    volumes:
      - ./6379/conf/:/6379/conf/
      - ./6379/data/:/6379/data/
    
  redis-server-6380:
    image: redis:7.2.4
    network_mode: host
    container_name: redis-server-6380
    restart: unless-stopped
    #ports:
    #  - 6380:6380
    environment:
      TZ: "Asia/Shanghai"
    command: ["/6380/conf/redis.conf"]
    volumes:
      - ./6380/conf/:/6380/conf/
      - ./6380/data/:/6380/data/ 
   
  redis-exporter:
    image: oliver006/redis_exporter
    network_mode: host
    restart: unless-stopped
    environment:
      TZ: Asia/Shanghai
      REDIS_ADDR: redis://localhost:6379,redis://localhost:6380
      REDIS_USER: redis_monitor
      REDIS_PASSWORD: Monpass_xxxx
    # ports:
    #   - 9121:9121

准备Redis配置文件

本机创建目录结构，并配置好redis.conf和users.acl文件。

mkdir -vp /opt/docker-compose/redis/6379/conf/
mkdir -vp /opt/docker-compose/redis/6379/data/

mkdir -vp /opt/docker-compose/redis/6380/conf/
mkdir -vp /opt/docker-compose/redis/6380/data/

主实例配置文件/opt/docker-compose/redis/6379/conf/redis.conf：

bind 0.0.0.0
port 6379
timeout 3600
tcp-keepalive 300
loglevel notice
databases 16

save 600 100
save 120 10000
save 7200 1

dir /6379/data/
masteruser clusterrepl  
masterauth Replpass_xxxx

aclfile /6379/conf/users.acl
replica-read-only yes

cluster-announce-ip ""172.x.x.11""
cluster-announce-port 6379

maxclients 10000
maxmemory 10gb
maxmemory-policy noeviction

appendonly yes
appendfsync everysec
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb

cluster-enabled yes
cluster-config-file nodes-6379.conf
cluster-node-timeout 15000

从实例配置文件/opt/docker-compose/redis/6380/conf/redis.conf：

bind 0.0.0.0
port 6380
timeout 3600
tcp-keepalive 300
loglevel notice
databases 16

save 600 100
save 120 10000
save 7200 1

dir /6380/data/
masteruser clusterrepl  
masterauth Replpass_xxxx

aclfile /6380/conf/users.acl
replica-read-only yes

cluster-announce-ip "172.x.x.11"
cluster-announce-port 6380

maxclients 10000
maxmemory 10gb
maxmemory-policy noeviction

appendonly yes
appendfsync everysec
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb

cluster-enabled yes
cluster-config-file nodes-6380.conf
cluster-node-timeout 15000

在/6379/conf/和/6380/conf/下配置ACL文件，定义好管理员用户、redis-exporter监控用户、主从同步用户、应用用户的相关权限。示例如下：

user default off nopass &* -@all
user root on >Rootpass_xxxx allkeys allchannels +@all
user redis_monitor on >Monpass_xxxx +client +ping +info +config|get +cluster|info +slowlog +latency +memory +select +get +scan +xinfo +type +pfcount +strlen +llen +scard +zcard +hlen +xlen +eval allkeys
user clusterrepl on >Replpass_xxxx +psync +replconf +ping
user appuser on >Apppass_xxxx allkeys allchannels +@all -@admin -@dangerous

Linux内核参数优化

修改Linux内核参数：

sed -i '/vm.overcommit_memory/d' /etc/sysctl.conf
echo "vm.overcommit_memory = 1" >> /etc/sysctl.conf
echo "net.core.somaxconn=2048" >> /etc/sysctl.conf
sysctl -p

禁用透明大页：

cat <<EOF >> /etc/rc.d/rc.local
if test -f /sys/kernel/mm/transparent_hugepage/enabled; then
  echo never > /sys/kernel/mm/transparent_hugepage/enabled
fi
EOF

chmod +x /etc/rc.d/rc.local

编辑/etc/security/limits.conf和/etc/security/limits.d/90-nproc.conf，添加以下配置：

*       soft    core    unlimited
*       hard    core    unlimited
*       soft    nofile  65536
*       hard    nofile  65536
*       soft    nproc   65536
*       hard    nproc   65536

最后重启服务器生效。

启停Redis实例

修改文件权限：

cd /opt/docker-compose/
chown -R polkitd:root redis/

在docker-compose.yml文件所在路径下执行以下命令来启停单个节点上的两个REDIS实例。

#启动容器
cd /opt/docker-compose/redis && docker-compose up -d

#停止容器
cd /opt/docker-compose/redis && docker-compose stop

Redis集群搭建

将三台服务器上的6个实例搭建成一个三主三从的集群模式：

docker exec -it redis-server-6379 redis-cli --user root -a <PASSWORD> \
--cluster create 172.x.x.11:6379 172.x.x.11:6380 172.x.x.12:6379 172.x.x.12:6380 172.x.x.13:6379 172.x.x.13:6380 \
--cluster-replicas 1 

集群创建过程中输出信息如下：

>>> Performing hash slots allocation on 6 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 172.x.x.11:6380 to 172.x.x.11:6379
Adding replica 172.x.x.12:6380 to 172.x.x.12:6379
Adding replica 172.x.x.13:6380 to 172.x.x.13:6379
>>> Trying to optimize slaves allocation for anti-affinity
[WARNING] Some slaves are in the same host as their master
M: a12d5d8daf4f7ef18a490f8db4766d66736c51e5 172.x.x.11:6379
   slots:[0-5460] (5461 slots) master
M: 7e6923ec3063d0833b134c3e30012d3a6605884b 172.x.x.12:6379
   slots:[5461-10922] (5462 slots) master
M: aa89fb16d032f62d58ac13d0b29450580f5f6337 172.x.x.13:6379
   slots:[10923-16383] (5461 slots) master
S: 26bfdc8f75bf45870e77b392e077b52380833bd9 172.x.x.11:6380
   replicates a12d5d8daf4f7ef18a490f8db4766d66736c51e5
S: 025b9b7e1163a39c4fcb76c6c8cb53b4c5a6604a 172.x.x.12:6380
   replicates 7e6923ec3063d0833b134c3e30012d3a6605884b
S: 042b02321735a6995f474703adb8d73601fc1773 172.x.x.13:6380
   replicates aa89fb16d032f62d58ac13d0b29450580f5f6337
Can I set the above configuration? (type 'yes' to accept): yes
>>> Nodes configuration updated
>>> Assign a different config epoch to each node
>>> Sending CLUSTER MEET messages to join the cluster
Waiting for the cluster to join

>>> Performing Cluster Check (using node 172.x.x.11:6379)
M: a12d5d8daf4f7ef18a490f8db4766d66736c51e5 172.x.x.11:6379
   slots:[0-5460] (5461 slots) master
   1 additional replica(s)
M: 7e6923ec3063d0833b134c3e30012d3a6605884b 172.x.x.12:6379
   slots:[5461-10922] (5462 slots) master
   1 additional replica(s)
S: 042b02321735a6995f474703adb8d73601fc1773 172.x.x.13:6380
   slots: (0 slots) slave
   replicates aa89fb16d032f62d58ac13d0b29450580f5f6337
S: 025b9b7e1163a39c4fcb76c6c8cb53b4c5a6604a 172.x.x.12:6380
   slots: (0 slots) slave
   replicates 7e6923ec3063d0833b134c3e30012d3a6605884b
S: 26bfdc8f75bf45870e77b392e077b52380833bd9 172.x.x.11:6380
   slots: (0 slots) slave
   replicates a12d5d8daf4f7ef18a490f8db4766d66736c51e5
M: aa89fb16d032f62d58ac13d0b29450580f5f6337 172.x.x.13:6379
   slots:[10923-16383] (5461 slots) master
   1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

检查集群节点：

docker exec -it redis-server-6379 redis-cli -c -h 172.x.x.11 -p 6379 cluster nodes

其中 -c 表示以集群模式执行，不加的话只会从当前连接的实例查询。

输出信息如下：

a12d5d8daf4f7ef18a490f8db4766d66736c51e5 172.x.x.11:6379@16379 myself,master - 0 1710740884000 1 connected 0-5460
7e6923ec3063d0833b134c3e30012d3a6605884b 172.x.x.12:6379@16379 master - 0 1710740885000 2 connected 5461-10922
042b02321735a6995f474703adb8d73601fc1773 172.x.x.13:6380@16380 slave aa89fb16d032f62d58ac13d0b29450580f5f6337 0 1710740887000 3 connected
025b9b7e1163a39c4fcb76c6c8cb53b4c5a6604a 172.x.x.12:6380@16380 slave 7e6923ec3063d0833b134c3e30012d3a6605884b 0 1710740885837 2 connected
26bfdc8f75bf45870e77b392e077b52380833bd9 172.x.x.11:6380@16380 slave a12d5d8daf4f7ef18a490f8db4766d66736c51e5 0 1710740886839 1 connected
aa89fb16d032f62d58ac13d0b29450580f5f6337 172.x.x.13:6379@16379 master - 0 1710740887841 3 connected 10923-16383

也可以直接检查节点信息文件。

cat /opt/docker-compose/redis/6379/data/nodes-6379.conf