operator部署有狀態的應用會簡單很多

github文檔：https://github.com/ucloud/redis-cluster-operator#deploy-redis-cluster-operator

Redis Cluster Operator在Kubernetes上管理Redis-Cluster集群

每個主節點及其從節點都由statefulSet管理，為每個statefulSet創建無頭svc，并為所有節點創建clusterIP服務。
每個有狀態集都使用PodAntiAffinity來確保主節點和從節點分散在不同的節點上。同時，當操作員在每個有狀態集中選擇主節點時，它會優先選擇具有不同k8s節點的容器作為主節點。

（1）下載redis-cluster-operator

git clone https://github.com/ucloud/redis-cluster-operator.git

在名稱空間：redis-cluster下部署Redis集群，注意修改yaml文件的namespace參數
創建名稱空間Namespace：redis-cluster

[root@k8s-master01 redis-cluster-operator-master]# kubectl create ns redis-cluster namespace/redis-node created [root@k8s-master01 redis-cluster-operator-master]# kubectl get ns NAME STATUS AGE default Active 76d ingress-nginx Active 9d kube-node-lease Active 76d kube-public Active 76d kube-system Active 76d kube-users Active 2d21h kubernetes-dashboard Active 45h redis-cluster Active 11s rook-ceph Active 33h [root@k8s-master01 redis-cluster-op

（2）創建自定義資源（CRD）

[root@k8s-master01 redis]# kubectl apply -f deploy/crds/ customresourcedefinition.apiextensions.k8s.io/distributedredisclusters.redis.kun created customresourcedefinition.apiextensions.k8s.io/redisclusterbackups.redis.kun created

（3）創建operator

[root@k8s-master01 redis]# kubectl create -f deploy/service_account.yaml serviceaccount/redis-cluster-operator created [root@k8s-master01 redis]# kubectl create -f deploy/cluster/cluster_role.yaml clusterrole.rbac.authorization.k8s.io/redis-cluster-operator created [root@k8s-master01 redis]# kubectl create -f deploy/cluster/cluster_role_binding.yaml clusterrolebinding.rbac.authorization.k8s.io/redis-cluster-operator created [root@k8s-master01 redis]# kubectl create -f deploy/cluster/operator.yaml deployment.apps/redis-cluster-operator created configmap/redis-admin created [root@k8s-master01 redis]# kubectl get deployment NAME READY UP-TO-DATE AVAILABLE AGE metrics-metrics-server 1/1 1 1 10d redis-cluster-operator 1/1 1 1 12s// cluster-scoped 命令 $ kubectl create -f deploy/service_account.yaml $ kubectl create -f deploy/cluster/cluster_role.yaml $ kubectl create -f deploy/cluster/cluster_role_binding.yaml $ kubectl create -f deploy/cluster/operator.yaml

（4）部署樣本Redis集群

注意：只有使用持久性存儲（pvc）的redis集群在意外刪除或滾動更新后才能恢復。即使您不使用持久性（如rdb或aof），也需要將pvc設置為redis。

apiVersion: redis.kun/v1alpha1 kind: DistributedRedisCluster metadata:annotations:# if your operator run as cluster-scoped, add this annotationsredis.kun/scope: cluster-scopedname: example-distributedrediscluster spec:image: redis:5.0.4-alpinemasterSize: 3clusterReplicas: 1resources:limits:cpu: 200mmemory: 200Mirequests:cpu: 200mmemory: 100Mi

因為使用樣本，沒有資源限制，會因為內存不足導致初始化失敗，限制使用這個測試

kubectl create -f deploy/example/custom-resources.yaml [root@k8s-master01 redis]# kubectl get pod,svc NAME READY STATUS RESTARTS AGE pod/drc-example-distributedrediscluster-0-0 1/1 Running 0 6m39s pod/drc-example-distributedrediscluster-0-1 1/1 Running 0 6m2s pod/drc-example-distributedrediscluster-1-0 1/1 Running 0 6m39s pod/drc-example-distributedrediscluster-1-1 1/1 Running 0 6m7s pod/drc-example-distributedrediscluster-2-0 1/1 Running 0 6m39s pod/drc-example-distributedrediscluster-2-1 1/1 Running 0 6m6s pod/metrics-metrics-server-6c7745d876-cw72h 1/1 Running 0 8h pod/redis-cluster-operator-7f6cf86475-dhttx 1/1 Running 0 11mNAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE service/example-distributedrediscluster ClusterIP 10.96.104.199 <none> 6379/TCP,16379/TCP 6m38s service/example-distributedrediscluster-0 ClusterIP None <none> 6379/TCP,16379/TCP 6m38s service/example-distributedrediscluster-1 ClusterIP None <none> 6379/TCP,16379/TCP 6m38s service/example-distributedrediscluster-2 ClusterIP None <none> 6379/TCP,16379/TCP 6m38s service/kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 76d service/metrics-metrics-server ClusterIP 10.96.86.164 <none> 443/TCP 10d service/nginx ClusterIP 10.96.215.251 <none> 80/TCP 9d service/redis-cluster-operator-metrics ClusterIP 10.96.58.127 <none> 8383/TCP,8686/TCP 11m [root@k8s-master01 redis]#

創建指定命名空間和動態存儲的，我這個沒有構建動態存儲

cat redis-cluster.yaml apiVersion: redis.kun/v1alpha1 kind: DistributedRedisCluster metadata:annotations:# if your operator run as cluster-scoped, add this annotationsredis.kun/scope: cluster-scopedname: example-distributedredisclusternamespace: redis-cluster spec:image: redis:5.0.4-alpineimagePullPolicy: IfNotPresentmasterSize: 3 #master節點數量clusterReplicas: 1 #每個master節點的從節點數量serviceName: redis-svc# resources configresources:limits:cpu: 300mmemory: 200Mirequests:cpu: 200mmemory: 150Mi# pv storagestorage:type: persistent-claimsize: 2Giclass: nfs-storagedeleteClaim: true ]# kubectl apply -f redis-cluster.yaml

（5）驗證集群

[root@k8s-master01 redis]# kubectl exec -it drc-example-distributedrediscluster-0-0 -- sh /data # redis-cli -c -h redis-svc Could not connect to Redis at redis-svc:6379: Name does not resolve not connected> /data # redis-cli -c -h example-distributedrediscluster example-distributedrediscluster:6379> cluster info cluster_state:ok cluster_slots_assigned:16384 cluster_slots_ok:16384 cluster_slots_pfail:0 cluster_slots_fail:0 cluster_known_nodes:6 cluster_size:3 cluster_current_epoch:5 cluster_my_epoch:0 cluster_stats_messages_ping_sent:511 cluster_stats_messages_pong_sent:485 cluster_stats_messages_meet_sent:1 cluster_stats_messages_sent:997 cluster_stats_messages_ping_received:481 cluster_stats_messages_pong_received:512 cluster_stats_messages_meet_received:4 cluster_stats_messages_received:997 example-distributedrediscluster:6379> set a b -> Redirected to slot [15495] located at 10.244.58.209:6379 OK 10.244.58.209:6379>

（6）擴展Redis集群

增加masterSize觸發放大。（注意：這個也直接可以使用edit修改。）

apiVersion: redis.kun/v1alpha1 kind: DistributedRedisCluster metadata:annotations:# if your operator run as cluster-scoped, add this annotationsredis.kun/scope: cluster-scopedname: example-distributedrediscluster spec:# Increase the masterSize to trigger the scaling.masterSize: 4ClusterReplicas: 1image: redis:5.0.4-alpine

（7）縮減Redis集群

減小masterSize觸發縮小。

apiVersion: redis.kun/v1alpha1 kind: DistributedRedisCluster metadata:annotations:# if your operator run as cluster-scoped, add this annotationsredis.kun/scope: cluster-scopedname: example-distributedrediscluster spec:# Increase the masterSize to trigger the scaling.masterSize: 3ClusterReplicas: 1image: redis:5.0.4-alpine

（8）刪除redis集群

]# cd redis-cluster-operator/ ]# kubectl delete -f redis-cluster.yaml ]# cd cluster/ ]# kubectl delete -f operator.yaml ]# kubectl delete -f cluster_role_binding.yaml ]# kubectl delete -f cluster_role.yaml ]# kubectl delete-f service_account.yaml ]# kubectl delete -f deploy/crds/ ]# kubectl delete -f ns-redis-cluster.yaml

github文檔：https://github.com/ucloud/redis-cluster-operator#deploy-redis-cluster-operator

參考鏈接：https://www.cnblogs.com/heian99/p/14508307.html

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