k8s部署的redis集群数据迁移

redis集群数据迁移

系统版本CentOS 7.9

k8s版本v1.19.16

redis版本6.2.6

源:单点redis数据

目的:redis集群，3主3从

1.查看集群信息

[root@k8s-master01 redis]# kubectl -n ops get po -owide |grep redis
redis-0                          1/1     Running   0          13m     100.84.122.168   k8s-master02              
redis-cluster-0                  1/1     Running   0          16h     100.84.122.161   k8s-master02              
redis-cluster-1                  1/1     Running   0          16h     100.66.195.13    k8s-master03              
redis-cluster-2                  1/1     Running   0          16h     100.84.122.160   k8s-master02              
redis-cluster-3                  1/1     Running   0          16h     100.66.195.11    k8s-master03              
redis-cluster-4                  1/1     Running   0          16h     100.84.122.166   k8s-master02              
redis-cluster-5                  1/1     Running   0          16h     100.66.195.12    k8s-master03              
[root@k8s-master01 redis]# 

[root@k8s-master01 redis]# kubectl get pvc -n ops |grep redis-pvc
redis-pvc                  Bound    pvc-399ae488-2ca8-4100-92d6-21b47c836234   1Gi        RWO            nfs-boge       33m
[root@k8s-master01 redis]# 

2.迁移思路

1.创建一个单点redis的pvc，名称为redis-pvc

cat > 01-redis-pv.yaml <<EOF
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  namespace: ops
  name: redis-pvc
spec:
  storageClassName: nfs-boge  #修改为自己的动态存储名称
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi
EOF



kubectl apply -f 01-redis-pv.yaml

2.将redis的备份文件导入pvc（redis-pvc）中
3.部署一个单点redis(redis-0)

cat > 02-redis-dan-yaml.yaml << 'eof'
apiVersion: v1
kind: ConfigMap
metadata:
  namespace: ops
  name: redis-single-config
data:
  redis.conf: |
    daemonize no
    bind 0.0.0.0
    port 6379
    tcp-backlog 511
    timeout 0
    tcp-keepalive 300
    pidfile /data/redis-server.pid
    logfile /data/redis.log
    loglevel notice
    databases 1
    always-show-logo yes
    save 900 1
    save 300 10
    save 60 10000
    stop-writes-on-bgsave-error yes
    rdbcompression yes
    rdbchecksum yes
    dbfilename dump.rdb
    dir /data
    slave-serve-stale-data yes
    slave-read-only yes
    repl-diskless-sync no
    repl-diskless-sync-delay 5
    repl-disable-tcp-nodelay no
    slave-priority 100
    appendonly yes
    appendfilename "appendonly.aof"
    appendfsync everysec
    no-appendfsync-on-rewrite no
    auto-aof-rewrite-percentage 100
    auto-aof-rewrite-min-size 64mb
    aof-load-truncated yes
    lua-time-limit 5000
    slowlog-log-slower-than 10000
    slowlog-max-len 128
    latency-monitor-threshold 0
    notify-keyspace-events ""
    hash-max-ziplist-entries 512
    hash-max-ziplist-value 64
    list-max-ziplist-size -2
    list-compress-depth 0
    set-max-intset-entries 512
    zset-max-ziplist-entries 128
    zset-max-ziplist-value 64
    hll-sparse-max-bytes 3000
    activerehashing yes
    client-output-buffer-limit normal 0 0 0
    client-output-buffer-limit slave 256mb 64mb 60
    client-output-buffer-limit pubsub 32mb 8mb 60
    hz 10
    aof-rewrite-incremental-fsync yes
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  namespace: ops
  name: redis
spec:
  serviceName: redis
  replicas: 1  # 副本数，根据需求进行更改
  selector:
    matchLabels:
      app: redis
  template:
    metadata:
      labels:
        app: redis
    spec:
      containers:
      - name: redis
        image: redis:6.2.6
        ports:
        - containerPort: 6379
        volumeMounts:
        - name: redis-data
          mountPath: /data
        - name: redis-single-config
          mountPath: "/etc/redis/redis.conf"
      volumes:
        - name: redis-single-config
          configMap:
            name: redis-single-config
        - name: redis-data
          persistentVolumeClaim:
            claimName: redis-pvc
---
apiVersion: v1
kind: Service
metadata:
  namespace: ops
  name: redis-service
spec:
  selector:
    app: redis
  type: NodePort     # 添加type字段，并设置为NodePort类型
  ports:
    - name: redis
      port: 6379
      protocol: TCP
      targetPort: 6379
      nodePort: 30011  # 添加nodePort字段，设置为您想要的节点端口号
eof


kubectl apply -f  02-redis-dan-yaml.yaml

4.集群执行命令同步redis-0中的数据

可以将数据从外部实例导入到 Redis 集群
将外部Redis实例 (100.84.122.168:6379) 导入到集群中的任意一节点，
倒入之后，原来集群的key变为空，导入到新集群的key会自动分片到各个mater节点的slot
-cluster-replace 如果集群 (100.84.122.161:6379) 中存在外部redis实例的key，则会覆盖掉(100.84.122.161:6379)的value

kubectl -n ops exec -it redis-cluster-0 -- redis-cli --cluster import 100.84.122.161:6379 --cluster-from 100.84.122.168:6379 --cluster-replace -a OpsRedis

3.验证redis信息

#登入redis
kubectl -n ops exec -it redis-cluster-0 -- redis-cli -c -p 6379  -a OpsRedis
127.0.0.1:6379> keys *

kubectl -n ops exec -it redis-cluster-1 -- redis-cli -c -p 6379  -a OpsRedis
127.0.0.1:6379> keys *

kubectl -n ops exec -it redis-cluster-2 -- redis-cli -c -p 6379  -a OpsRedis
127.0.0.1:6379> keys *