卸載舊版本docker uninstall old version
sudo yum remove docker \
docker-client \
docker-client-latest \
docker-common \
docker-latest \
docker-latest-logrotate \
docker-logrotate \
docker-engine
安裝repo install docker repo
sudo yum install -y yum-utils \
device-mapper-persistent-data \
lvm2
sudo yum-config-manager \
--add-repo \
https://download.docker.com/linux/centos/docker-ce.repo
安裝社區版本install Docker Engine-Community
sudo yum install -y docker-ce docker-ce-cli containerd.io --skip-broken
設置服務啓動和測試鏡像
sudo systemctl start docker
sudo systemctl enable docker
sudo docker run hello-world
安裝git和下載代碼
sudo yum install -y git
git clone https://github.com/AliyunContainerService/redis-cluster
cd redis-cluster
檢查docker compose文件
cat docker-compose.yml
master:
image: redis:3
slave:
image: redis:3
command: redis-server --slaveof redis-master 6379
links:
- master:redis-master
sentinel:
build: sentinel
environment:
- SENTINEL_DOWN_AFTER=5000
- SENTINEL_FAILOVER=5000
links:
- master:redis-master
- slave
在模板中定義了下面一系列服務
- master: Redis master
- slave: Redis slave
- sentinel: Redis Sentinel
cat sentinel.conf
# Example sentinel.conf can be downloaded from http://download.redis.io/redis-stable/sentinel.conf
port 26379
dir /tmp
sentinel monitor mymaster redis-master 6379 $SENTINEL_QUORUM
sentinel down-after-milliseconds mymaster $SENTINEL_DOWN_AFTER
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster $SENTINEL_FAILOVER
並以sentinel模式啓動容器。其配置文件如下，其中包含了sentinel對名爲"mymaster"的集羣的監控配置
注意：
- slave和sentinel容器初始化配置的Redis master節點主機名爲"redis-master"，這裏我們利用了Docker容器連接的別名機制來連接master和sentinel/slave容器實例
- 由於我們會部署3個Sentinel，我們把sentinel的"quorum"設置爲2，只有兩個sentinel同意故障切換，纔會真正切換相應的redis master節點。
sudo yum install -y docker-compose
sudo docker-compose up -d
容我上個廁所
。。。。。。。。。。。
廁所回來都好了
docker ps
怎麼只有2個哨兵，擴展到3個
docker-compose scale sentinel=3
順大便擴容2個slave redis
docker-compose scale slave=2
看下目前跑的內容
docker ps|sort -k2
改一個測試redis宕機的腳本
vi test.sh
MASTER_IP=$(docker inspect --format '{{ .NetworkSettings.IPAddress }}' rediscluster_master_1)
SLAVE_IP=$(docker inspect --format '{{ .NetworkSettings.IPAddress }}' rediscluster_slave_1)
SENTINEL_IP=$(docker inspect --format '{{ .NetworkSettings.IPAddress }}' rediscluster_sentinel_1)
echo Redis master: $MASTER_IP
echo Redis Slave: $SLAVE_IP
echo ------------------------------------------------
echo Initial status of sentinel
echo ------------------------------------------------
docker exec rediscluster_sentinel_1 redis-cli -p 26379 info Sentinel
echo Current master is
docker exec rediscluster_sentinel_1 redis-cli -p 26379 SENTINEL get-master-addr-by-name mymaster
echo ------------------------------------------------
echo Stop redis master
docker pause rediscluster_master_1
echo Wait for 10 seconds
sleep 10
echo Current infomation of sentinel
docker exec rediscluster_sentinel_1 redis-cli -p 26379 info Sentinel
echo Current master is
docker exec rediscluster_sentinel_1 redis-cli -p 26379 SENTINEL get-master-addr-by-name mymaster
echo ------------------------------------------------
echo Restart Redis master
docker unpause rediscluster_master_1
sleep 5
echo Current infomation of sentinel
docker exec rediscluster_sentinel_1 redis-cli -p 26379 info Sentinel
echo Current master is
docker exec rediscluster_sentinel_1 redis-cli -p 26379 SENTINEL get-master-addr-by-name mymaster
./test.sh
發現redis master 進行了切換
但是一臺主機的3個redis和3個sentinel 不能算高可用，需要將redis和sentinel部署到不同區域的多個主機中