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k8s部署redis cluster集群的实现_Redis_

2023-05-27 461人已围观

简介 k8s部署redis cluster集群的实现_Redis_

Redis 介绍

  • Redis代表REmote DIctionary Server是一种开源的内存中数据存储，通常用作数据库，缓存或消息代理。它可以存储和操作高级数据类型，例如列表，地图，集合和排序集合。
  • 由于Redis接受多种格式的密钥，因此可以在服务器上执行操作，从而减少了客户端的工作量。
  • 它仅将磁盘用于持久性，而将数据完全保存在内存中。
  • Redis是一种流行的数据存储解决方案，并被GitHub，Pinterest，Snapchat，Twitter，StackOverflow，Flickr等技术巨头所使用。

为什么要用Redis

  • 它的速度非常快。它是用ANSI C编写的，并且可以在POSIX系统上运行，例如Linux，Mac OS X和Solaris。
  • Redis通常被排名为最流行的键/值数据库和最流行的与容器一起使用的NoSQL数据库。
  • 其缓存解决方案减少了对云数据库后端的调用次数。
  • 应用程序可以通过其客户端API库对其进行访问。
  • 所有流行的编程语言都支持Redis。
  • 它是开源且稳定的。

什么是Redis Cluster集群

  • Redis Cluster是一组Redis实例，旨在通过对数据库进行分区来扩展数据库，从而使其更具弹性。
  • 群集中的每个成员（无论是主副本还是辅助副本）都管理哈希槽的子集。如果主机无法访问，则其从机将升级为主机。在由三个主节点组成的最小Redis群集中，每个主节点都有一个从节点（以实现最小的故障转移），每个主节点都分配有一个介于0到16,383之间的哈希槽范围。节点A包含从0到5000的哈希槽，节点B从5001到10000，节点C从10001到16383。
  • 群集内部的通信是通过内部总线进行的，使用协议传播有关群集的信息或发现新节点。

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 7.8192.168.30.128master>=2>=2Gmaster1
CentOS 7.8192.168.30.129master>=2>=2Gmaster2
CentOS 7.8192.168.30.130node>=2>=2Gnode1
CentOS 7.8192.168.30.131node>=2>=2Gnode2
CentOS 7.8192.168.30.132node>=2>=2Gnode3
 kubectl get node NAME STATUS ROLES AGE VERSION master1 Ready master 33d v1.14.0 master2 Ready master 33d v1.14.0 node1 Ready  33d v1.14.0 node2 Ready  33d v1.14.0 node3 Ready  33d v1.14.0

部署nfs

在master2节点上做nfs共享，

 yum -y install nfs-utils rpcbind mkdir -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: v1 kind: PersistentVolume metadata: name: nfs-pv0 spec: capacity: storage: 1Gi accessModes: - ReadWriteMany nfs: server: 192.168.30.129 path: /data/redis/cluster0 --- apiVersion: v1 kind: PersistentVolume metadata: name: nfs-pv1 spec: capacity: storage: 1Gi accessModes: - ReadWriteMany nfs: server: 192.168.30.129 path: /data/redis/cluster1 --- apiVersion: v1 kind: PersistentVolume metadata: name: nfs-pv2 spec: capacity: storage: 1Gi accessModes: - ReadWriteMany nfs: server: 192.168.30.129 path: /data/redis/cluster2 --- apiVersion: v1 kind: PersistentVolume metadata: name: nfs-pv3 spec: capacity: storage: 1Gi accessModes: - ReadWriteMany nfs: server: 192.168.30.129 path: /data/redis/cluster3 --- apiVersion: v1 kind: PersistentVolume metadata: name: nfs-pv4 spec: capacity: storage: 1Gi accessModes: - ReadWriteMany nfs: server: 192.168.30.129 path: /data/redis/cluster4 --- apiVersion: v1 kind: PersistentVolume metadata: name: nfs-pv5 spec: capacity: storage: 1Gi accessModes: - ReadWriteMany nfs: server: 192.168.30.129 path: /data/redis/cluster5
 kubectl apply -f pv.yaml kubectl get pv NAME 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: v1 kind: Namespace metadata: 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: v1 kind: Service metadata: name: redis namespace: public-service labels: app: redis spec: selector: app: redis appCluster: redis-cluster ports: - name: redis port: 6379 clusterIP: None --- apiVersion: v1 kind: Service metadata: name: redis-access namespace: public-service labels: app: redis spec: selector: app: redis appCluster: redis-cluster ports: - name: redis-access protocol: TCP port: 6379 targetPort: 6379 --- apiVersion: apps/v1 kind: StatefulSet metadata: name: redis namespace: public-service spec: 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  6379/TCP 20s redis-access ClusterIP 10.96.2.100  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 bash root@ubuntu:/# cat > /etc/apt/sources.list << EOF deb 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 update root@ubuntu:/# apt-get install -y libncursesw5 libreadline6 libtinfo5 --allow-remove-essential root@ubuntu:/# apt-get install -y libpython2.7-stdlib python2.7 python-pip redis-tools dnsutils root@ubuntu:/# pip install --upgrade pip root@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.clu
                
                

                

                                            
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