k8s部署redis cluster集群
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k8s以StatefulSet方式部署redis cluster集群：
1. 部署nfs 2. 创建pv 3. 部署redis 4. 初始化redis集群
- 主机说明：
| 系统 | ip | 角色 | cpu | 内存 | hostname |
|---|---|---|---|---|---|
| CentOS 7.8 | 192.168.30.128 | master | >=2 | >=2G | master1 |
| CentOS 7.8 | 192.168.30.129 | master | >=2 | >=2G | master2 |
| CentOS 7.8 | 192.168.30.130 | node | >=2 | >=2G | node1 |
| CentOS 7.8 | 192.168.30.131 | node | >=2 | >=2G | node2 |
| CentOS 7.8 | 192.168.30.132 | node | >=2 | >=2G | node3 |
kubectl get node NAME STATUS ROLES AGE VERSION master1 Ready master 33d v1.14.0 master2 Ready master 33d v1.14.0 node1 Ready <none> 33d v1.14.0 node2 Ready <none> 33d v1.14.0 node3 Ready <none> 33d v1.14.0
部署nfs
在master2节点上做nfs共享，
yum -y install nfs-utils rpcbindmkdir -p /data/redis/{cluster0,cluster1,cluster2,cluster3,cluster4,cluster5}vim /etc/exports/data/redis/cluster0 192.168.30.0/24(rw,sync,no_root_squash) /data/redis/cluster1 192.168.30.0/24(rw,sync,no_root_squash) /data/redis/cluster2 192.168.30.0/24(rw,sync,no_root_squash) /data/redis/cluster3 192.168.30.0/24(rw,sync,no_root_squash) /data/redis/cluster4 192.168.30.0/24(rw,sync,no_root_squash) /data/redis/cluster5 192.168.30.0/24(rw,sync,no_root_squash)
chmod -R 755 /data/redis exportfs -arv systemctl enable rpcbind && systemctl start rpcbind systemctl enable nfs && systemctl start nfs
nfs部署完毕。对于需要使用nfs的node节点，都要安装nfs：
yum -y install nfs-utils
创建pv
- 创建pv：
mkdir -p /home/k8s/redis && cd /home/k8s/redis vim pv.yaml
apiVersion: v1kind: PersistentVolumemetadata: name: nfs-pv0spec: capacity: storage: 1Gi accessModes: - ReadWriteMany nfs: server: 192.168.30.129 path: /data/redis/cluster0---apiVersion: v1kind: PersistentVolumemetadata: name: nfs-pv1spec: capacity: storage: 1Gi accessModes: - ReadWriteMany nfs: server: 192.168.30.129 path: /data/redis/cluster1---apiVersion: v1kind: PersistentVolumemetadata: name: nfs-pv2spec: capacity: storage: 1Gi accessModes: - ReadWriteMany nfs: server: 192.168.30.129 path: /data/redis/cluster2---apiVersion: v1kind: PersistentVolumemetadata: name: nfs-pv3spec: capacity: storage: 1Gi accessModes: - ReadWriteMany nfs: server: 192.168.30.129 path: /data/redis/cluster3---apiVersion: v1kind: PersistentVolumemetadata: name: nfs-pv4spec: capacity: storage: 1Gi accessModes: - ReadWriteMany nfs: server: 192.168.30.129 path: /data/redis/cluster4---apiVersion: v1kind: PersistentVolumemetadata: name: nfs-pv5spec: capacity: storage: 1Gi accessModes: - ReadWriteMany nfs: server: 192.168.30.129 path: /data/redis/cluster5
kubectl apply -f pv.yaml kubectl get pvNAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE nfs-pv0 1Gi RWX Retain Available 3s nfs-pv1 1Gi RWX Retain Available 3s nfs-pv2 1Gi RWX Retain Available 3s nfs-pv3 1Gi RWX Retain Available 3s nfs-pv4 1Gi RWX Retain Available 3s nfs-pv5 1Gi RWX Retain Available 3s
pv创建完毕。
部署redis
vim namespace.yaml
apiVersion: v1kind: Namespacemetadata: name: public-service
vim redis.conf
appendonly yes cluster-enabled yes cluster-config-file /var/lib/redis/nodes.conf cluster-node-timeout 5000 dir /var/lib/redis port 6379
vim redis.yaml
apiVersion: v1kind: Servicemetadata: name: redis namespace: public-service labels: app: redisspec: selector: app: redis appCluster: redis-cluster ports: - name: redis port: 6379 clusterIP: None ---apiVersion: v1kind: Servicemetadata: name: redis-access namespace: public-service labels: app: redisspec: selector: app: redis appCluster: redis-cluster ports: - name: redis-access protocol: TCP port: 6379 targetPort: 6379---apiVersion: apps/v1kind: StatefulSetmetadata: name: redis namespace: public-servicespec: serviceName: redis replicas: 6 selector: matchLabels: app: redis appCluster: redis-cluster template: metadata: labels: app: redis appCluster: redis-cluster spec: terminationGracePeriodSeconds: 20 affinity: podAntiAffinity: preferredDuringSchedulingIgnoredDuringExecution: - weight: 100 podAffinityTerm: labelSelector: matchExpressions: - key: app operator: In values: - redis topologyKey: kubernetes.io/hostname containers: - name: redis image: redis:latest command: - "redis-server" args: - "/etc/redis/redis.conf" - "--protected-mode" - "no" resources: requests: cpu: "500m" memory: "500Mi" ports: - containerPort: 6379 name: redis protocol: TCP - containerPort: 16379 name: cluster protocol: TCP volumeMounts: - name: conf mountPath: /etc/redis - name: data mountPath: /var/lib/redis volumes: - name: conf configMap: name: redis-conf items: - key: redis.conf path: redis.conf volumeClaimTemplates: - metadata: name: data namespace: public-service spec: accessModes: [ "ReadWriteMany" ] resources: requests: storage: 1Gi
kubectl apply -f namespace.yaml kubectl create configmap redis-conf --from-file=redis.conf -n public-service kubectl apply -f redis.yaml kubectl get svc -n public-service NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE redis ClusterIP None <none> 6379/TCP 20s redis-access ClusterIP 10.96.2.100 <none> 6379/TCP 20s kubectl get pod -n public-service NAME READY STATUS RESTARTS AGE redis-0 1/1 Running 0 2m43s redis-1 1/1 Running 0 2m18s redis-2 1/1 Running 0 108s redis-3 1/1 Running 0 80s redis-4 1/1 Running 0 48s redis-5 1/1 Running 0 30s kubectl get pvc -n public-service NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE data-redis-0 Bound nfs-pv4 1Gi RWX 3m4s data-redis-1 Bound nfs-pv0 1Gi RWX 2m39s data-redis-2 Bound nfs-pv1 1Gi RWX 2m9s data-redis-3 Bound nfs-pv2 1Gi RWX 101s data-redis-4 Bound nfs-pv3 1Gi RWX 69s data-redis-5 Bound nfs-pv5 1Gi RWX 51s
redis-access这个service方便集群内访问redis集群，redis部署完毕。
初始化redis集群
使用Redis-tribe工具进行集群的初始化。
- 下载redis-tribe：
kubectl run -it ubuntu --image=ubuntu --restart=Never -n public-service bashroot@ubuntu:/# cat > /etc/apt/sources.list << EOFdeb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial universe deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates universe deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial multiverse deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates multiverse deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security universe deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security multiverse EOF
root@ubuntu:/# apt-get updateroot@ubuntu:/# apt-get install -y libncursesw5 libreadline6 libtinfo5 --allow-remove-essentialroot@ubuntu:/# apt-get install -y libpython2.7-stdlib python2.7 python-pip redis-tools dnsutilsroot@ubuntu:/# pip install --upgrade piproot@ubuntu:/# pip install redis-trib==0.5.1
- 初始化集群：
root@ubuntu:/# redis-trib.py create \ `dig +short redis-0.redis.public-service.svc.cluster.local`:6379 \ `dig +short redis-1.redis.public-service.svc.cluster.local`:6379 \ `dig +short redis-2.redis.public-service.svc.cluster.local`:6379 root@ubuntu:/# redis-trib.py replicate \ --master-addr `dig +short redis-0.redis.public-service.svc.cluster.local`:6379 \ --slave-addr `dig +short redis-3.redis.public-service.svc.cluster.local`:6379 root@ubuntu:/# redis-trib.py replicate \ --master-addr `dig +short redis-1.redis.public-service.svc.cluster.local`:6379 \ --slave-addr `dig +short redis-4.redis.public-service.svc.cluster.local`:6379 root@ubuntu:/# redis-trib.py replicate \ --master-addr `dig +short redis-2.redis.public-service.svc.cluster.local`:6379 \ --slave-addr `dig +short redis-5.redis.public-service.svc.cluster.local`:6379 root@ubuntu:/# exit
- 查看集群：
kubectl exec -it -n public-service redis-0 bashroot@redis-0:/data# redis-cli -c127.0.0.1:6379> CLUSTER NODES #列出节点信息aac2b3d320da67eedf3512ed0e38a1cdce5bc8fe 172.10.2.55:6379@16379 slave 7c4d60cf32685484ea6c5cb4493a937dfbf6b8a5 0 1592276224727 3 connected 2efad514b2f3c7fe4530dd6dc63c0df8ffdb793d 172.10.2.54:6379@16379 master - 0 1592276224224 1 connected 0-5461 524f03526a4b683d7d4de19296431810bfdc22cf 172.10.3.60:6379@16379 slave df5bc3c2e2851d63cdb9f762efde6e1b0d38efed 0 1592276223117 5 connected 7c4d60cf32685484ea6c5cb4493a937dfbf6b8a5 172.10.4.77:6379@16379 myself,master - 0 1592276224000 2 connected 5462-10922 df5bc3c2e2851d63cdb9f762efde6e1b0d38efed 172.10.3.59:6379@16379 master - 0 1592276223217 0 connected 10923-16383 c1dbaaef4a583e372c43eed52c22cd9ad7184d18 172.10.4.78:6379@16379 slave 2efad514b2f3c7fe4530dd6dc63c0df8ffdb793d 0 1592276223719 4 connected 127.0.0.1:6379> CLUSTER INFO #集群状态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:2 cluster_stats_messages_ping_sent:514 cluster_stats_messages_pong_sent:491 cluster_stats_messages_meet_sent:2 cluster_stats_messages_sent:1007 cluster_stats_messages_ping_received:491 cluster_stats_messages_pong_received:516 cluster_stats_messages_received:1007
redis集群初始化完成，已经形成3主3从的cluster集群。
- 写入数据：
127.0.0.1:6379> SET key1 aaa OK 127.0.0.1:6379> SET key2 bbb -> Redirected to slot [4998] located at 172.10.2.54:6379 OK 172.10.2.54:6379> SET key3 ccc OK
kubectl exec -it -n public-service redis-4 bashroot@redis-4:/data# redis-cli -c127.0.0.1:6379> GET key1 -> Redirected to slot [9189] located at 172.10.4.77:6379"aaa"172.10.4.77:6379> GET key2 -> Redirected to slot [4998] located at 172.10.2.54:6379"bbb"172.10.2.54:6379> GET key3"ccc"
可以看出redis cluster集群是去中心化的，每个节点都是平等的，连接哪个节点都可以获取和设置数据。
- 主从切换：
选择redis-2模拟宕掉，测试主从切换，
kubectl get pod -n public-service -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES redis-0 1/1 Running 0 62m 172.10.4.77 node1 <none> <none>redis-1 1/1 Running 0 62m 172.10.2.54 node2 <none> <none>redis-2 1/1 Running 0 61m 172.10.3.59 node3 <none> <none>redis-3 1/1 Running 0 61m 172.10.2.55 node2 <none> <none>redis-4 1/1 Running 0 61m 172.10.4.78 node1 <none> <none>redis-5 1/1 Running 0 61m 172.10.3.60 node3 <none> <none>ubuntu 0/1 Completed 0 57m 172.10.2.56 node2 <none> <none>kubectl exec -it -n public-service redis-2 bashroot@redis-2:/data# redis-cli -c127.0.0.1:6379> ROLE 1) "master"2) (integer) 2898 3) 1) 1) "172.10.3.60" 2) "6379" 3) "2898"
可以看到，redis-2是master，它的slave是172.10.3.60，即redis-5。
kubectl delete pod -n public-service redis-2 #模拟节点宕掉kubectl get pod -n public-service redis-2 -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES redis-2 1/1 Running 0 38s 172.10.3.61 node3 <none> <none>kubectl exec -it -n public-service redis-2 bashroot@redis-2:/data# redis-cli -c127.0.0.1:6379> ROLE 1) "slave"2) "172.10.3.60"3) (integer) 6379 4) "connected"5) (integer) 3430
kubectl exec -it -n public-service redis-5 bashroot@redis-5:/data# redis-cli -c127.0.0.1:6379> ROLE 1) "master"2) (integer) 3584 3) 1) 1) "172.10.3.61" 2) "6379" 3) "3570" 127.0.0.1:6379> CLUSTER NODES aac2b3d320da67eedf3512ed0e38a1cdce5bc8fe 172.10.2.55:6379@16379 slave 7c4d60cf32685484ea6c5cb4493a937dfbf6b8a5 0 1592278859530 2 connected 2efad514b2f3c7fe4530dd6dc63c0df8ffdb793d 172.10.2.54:6379@16379 master - 0 1592278859000 1 connected 0-5461 c1dbaaef4a583e372c43eed52c22cd9ad7184d18 172.10.4.78:6379@16379 slave 2efad514b2f3c7fe4530dd6dc63c0df8ffdb793d 0 1592278859000 1 connected 524f03526a4b683d7d4de19296431810bfdc22cf 172.10.3.60:6379@16379 myself,master - 0 1592278857000 6 connected 10923-16383 7c4d60cf32685484ea6c5cb4493a937dfbf6b8a5 172.10.4.77:6379@16379 master - 0 1592278858021 2 connected 5462-10922 df5bc3c2e2851d63cdb9f762efde6e1b0d38efed 172.10.3.61:6379@16379 slave 524f03526a4b683d7d4de19296431810bfdc22cf 0 1592278859000 6 connected
可以看到，redis-2在重启之后变为slave，而它之前的slave——redis-5变为master，而且是新redis-2的master。
集群的主从切换没有问题。k8s部署redis cluster集群完成。
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