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This article is about Docker Compose stand-alone configuration of Redis and Senti to share with you. The editor thought it was very practical, so I shared it with you to learn. The following information is about the steps of Docker Compose stand-alone configuration of Redis and Senti.

Uninstall the old version of docker uninstall old version

Sudo yum remove docker\

Docker-client\

Docker-client-latest\

Docker-common\

Docker-latest\

Docker-latest-logrotate\

Docker-logrotate\

Docker-engine

Install 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

Install the community version of install Docker Engine-Community

Sudo yum install-y docker-ce docker-ce-cli containerd.io-- skip-broken

Set up service startup and test images

Sudo systemctl start docker

Sudo systemctl enable docker

Sudo docker run hello-world

Install git and download code

Sudo yum install-y git

Git clone https://github.com/AliyunContainerService/redis-cluster

Cd redis-cluster

Check the docker compose file

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

The following series of services are defined in the template

Master: Redis masterslave: Redis slavesentinel: 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

And start the container in sentinel mode. The configuration file is as follows, which contains the sentinel monitoring configuration for the cluster named "mymaster"

Note:

The Redis master node hostname of the initialization configuration of slave and sentinel containers is "redis-master". Here we use the alias mechanism of Docker container connection to connect master and sentinel/slave container instances. Since we will deploy three Sentinel, we set the "quorum" of sentinel to 2. Only the two sentinel agree to failover, the corresponding redis master node will be switched.

Sudo yum install-y docker-compose

Sudo docker-compose up-d

The toilet is all ready.

Docker ps

Why are there only two sentinels, expanded to three?

Docker-compose scale sentinel=3

Expand the capacity of 2 slave redis through defecation

Docker-compose scale slave=2

Take a look at the contents of the current run.

Docker ps | sort-K2

Change a script to test redis downtime

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

Redis master was found to have switched.

However, 3 redis and 3 sentinel of one host are not highly available, so redis and sentinel need to be deployed to multiple hosts in different regions.

These are the details of Docker Compose stand-alone configuration of Redis and Senti. Have you gained anything after reading it? If you want to know more about it, you are welcome to follow the industry information!

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