Kubesphere - set up redis cluster

One 、KubeSphere - build Redis colony

In the last article, we introduced the use of KubeSphere stay k8s Created in mysql Master slave replication structure , In this article, we use KubeSphere stay k8s Build in Redis colony , Here is the address of the last article ：

https://blog.csdn.net/qq_43692950/article/details/122819844

Before the experiment , Please make sure that the installation is complete k8s And kubesphere Environmental Science ：

Two 、 establish redis.conf Prepare a dictionary

Name the preparation ：

Add data , The key is redis.conf, Value is written in the following ：

cluster-enabled yes
cluster-config-file nodes.conf
cluster-node-timeout 5000
cluster-require-full-coverage no
cluster-migration-barrier 1
appendonly yes

3、 ... and 、 establish redis service

Click Create , Choose stateful Services ：

Also create a name for the service ：

We choose the number of containers below 6 individual , Build a three master and three slave structure ：

What I choose to mirror is redis:6.2.3 Version of , Use the default port , And according to the size of their services , Reasonably set resource limits ：

Also specify redis The start command of ： redis-server /etc/redis/redis.conf

Click next , Here we need to select the storage volume template , Let different containers correspond to different storage volumes ：

Select the storage type 、 Access pattern 、 And container size , And mount redis Of /data ：

Then select mount configuration , mount redis.conf ：

Select the configuration dictionary created above , And mount /etc/redis Next ：

And then the next step , establish , Click this service to enter details , You can see the created container ：

Because we all adopt a stateful way , By default Headless, So each redis The interview of , We can all use dns How to use domain name , The format is ：

(podname).(headless server name).(namespace).svc.cluster.local

Here we go through ： Container name . Service DNS.svc.cluster.local ：

So the visit redis-cluster-v1-0 Of redis Words , Direct access redis-cluster-v1-0.redis-cluster.test-project.svc.cluster.local:6379 that will do , Such as into the redis-cluster-v1-2 Terminal , Link to the address above ：

So now we can use the domain name redis Cluster initialization , Enter one at random redis Under the terminal of the node , Type in the command , Initialize the cluster ：

redis-cli --cluster create redis-cluster-v1-0.redis-cluster.test-project.svc.cluster.local:6379 redis-cluster-v1-0.redis-cluster.test-project.svc.cluster.local:6379 redis-cluster-v1-0.redis-cluster.test-project.svc.cluster.local:6379 redis-cluster-v1-0.redis-cluster.test-project.svc.cluster.local:6379 redis-cluster-v1-0.redis-cluster.test-project.svc.cluster.local:6379 redis-cluster-v1-0.redis-cluster.test-project.svc.cluster.local:6379 --cluster-replicas 1

Enter yes, Use this fragmentation scheme ：

You will find that there is an error ：

This is because redis The domain name support is not very good , have access to ip + port The way , But in k8s If the container goes down, it will start automatically , After startup ip It's possible to change , So in k8s in Use ip + port It is not advisable to initialize the cluster in the way of , So what's the solution ？ Now we can use it Redis-tribe Tools , however Redis-tribe Not recommended and redis Install together , You can start a new one Ubuntu Containers , Dedicated to K8S Management and control of some services within the cluster .

Four 、Redis-tribe initialization Redis colony

Someone has packed it Redis-tribe Mirror image , We can use it directly , This mainly refers to the following article ：

https://blog.csdn.net/wangmiaoyan/article/details/106193388

Select Create service , Select directly to yml The way

Enter the following , Be careful namespace Fill in your project name , Otherwise, it's not in one namespace Next , The container cannot be found in the container group .

apiVersion: apps/v1
kind: Deployment
metadata:
  namespace: test-project
  labels:
    app: redis-cluster-tools
  name: redis-cluster-tools
spec:
  replicas: 1
  selector:
    matchLabels:
      app: redis-cluster-tools
  template:
    metadata:
      labels:
        app: redis-cluster-tools
      name: pos-redis
    spec:
     containers:
     - name: pos-redis
       image: sunnywang/redis-tools-ubuntu:v0.5.1
       imagePullPolicy: IfNotPresent
       args:
       - /bin/bash
       - -c
       - sleep 3600

Click create , You can see the created container in the container group .

Click the terminal to enter the container , initialization master node , Pay attention to modify the format of your domain name ：

redis-trib.py create `dig +short redis-cluster-v1-0.redis-cluster.test-project.svc.cluster.local`:6379 `dig +short redis-cluster-v1-1.redis-cluster.test-project.svc.cluster.local`:6379 `dig +short redis-cluster-v1-2.redis-cluster.test-project.svc.cluster.local`:6379

And then to master Add replica nodes ：

redis-trib.py replicate --master-addr `dig +short redis-cluster-v1-0.redis-cluster.test-project.svc.cluster.local`:6379 --slave-addr `dig +short redis-cluster-v1-3.redis-cluster.test-project.svc.cluster.local`:6379

redis-trib.py replicate  --master-addr `dig +short redis-cluster-v1-1.redis-cluster.test-project.svc.cluster.local`:6379 --slave-addr `dig +short redis-cluster-v1-4.redis-cluster.test-project.svc.cluster.local`:6379

redis-trib.py replicate --master-addr `dig +short redis-cluster-v1-2.redis-cluster.test-project.svc.cluster.local`:6379 --slave-addr `dig +short redis-cluster-v1-5.redis-cluster.test-project.svc.cluster.local`:6379

Enter one randomly below redis Check the status of the cluster in the terminal ：

cluster info

Here we are redis The cluster has been built successfully .

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