Kubernetes 环境下部署单节点 Redis

配置文件

假设把配置文件放在目录 ./redis 下

namespace.yaml

apiVersion: v1
kind: Namespace
metadata:
  name: redis
  labels:
    app.kubernetes.io/name: redis
    app.kubernetes.io/instance: redis

config.yaml

kind: ConfigMap
apiVersion: v1
metadata:
  name: redis-config
  namespace: redis
  labels:
    app: redis
data:
  redis.conf: |-
    dir /data
    port 6379
    bind 0.0.0.0
    appendonly yes
    protected-mode no
    requirepass Hello1234!!!!
    pidfile /data/redis-6379.pid

pvc.yaml

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: redis-pvc
  namespace: redis
  labels:
    app: redis
  annotations:
    volume.beta.kubernetes.io/storage-class: "nfs-storage"
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 2Gi

deployment.yaml

---
apiVersion: v1
kind: Service
metadata:
  name: redis-svc
  namespace: redis
  labels:
    app: redis
spec:
  type: ClusterIP
  ports:
    - name: redis
      port: 6379
  selector:
    app: redis
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: redis-dep
  namespace: redis
  labels:
    app: redis
spec:
  replicas: 1
  selector:
    matchLabels:
      app: redis
  template:
    metadata:
      labels:
        app: redis
    spec:
      # 进行初始化操作，修改系统配置，解决 Redis 启动时提示的警告信息
       initContainers:
        - name: system-init
          image: busybox:1.32
          imagePullPolicy: IfNotPresent
          command:
            - "sh"
            - "-c"
            - "echo 2048 > /proc/sys/net/core/somaxconn && echo never > /sys/kernel/mm/transparent_hugepage/enabled"
          securityContext:
            privileged: true
            runAsUser: 0
          volumeMounts:
          - name: sys
            mountPath: /sys
      containers:
        - name: redis
          image: redis:5.0.8
          command:
            - "sh"
            - "-c"
            - "redis-server /usr/local/etc/redis/redis.conf"
          ports:
            - containerPort: 6379
          resources:
            limits:
              cpu: 1000m
              memory: 1024Mi
            requests:
              cpu: 1000m
              memory: 1024Mi
          livenessProbe:
            tcpSocket:
              port: 6379
            initialDelaySeconds: 300
            timeoutSeconds: 1
            periodSeconds: 10
            successThreshold: 1
            failureThreshold: 3
          readinessProbe:
            tcpSocket:
              port: 6379
            initialDelaySeconds: 5
            timeoutSeconds: 1
            periodSeconds: 10
            successThreshold: 1
            failureThreshold: 3
          volumeMounts:
            - name: data
              mountPath: /data
            - name: config
              mountPath: /usr/local/etc/redis/redis.conf
              subPath: redis.conf
      volumes:
        - name: data
          persistentVolumeClaim:
            claimName: redis-pvc
        - name: config
          configMap:
            name: redis-config
        - name: sys
          hostPath:
            path: /sys

kustomization.yaml

secretGenerator:
- name: mysql-creds
  literals:
  - ROOT_PASSWORD=root
resources:
  - namespace.yaml
  - config.yaml
  - pvc.yaml
  - deployment.yaml

创建资源

命令如下

kubectl apply -k ./redis

结果:

[user@vm-centos-7 ~]$ kubectl get all -n redis
NAME                             READY   STATUS    RESTARTS   AGE
pod/redis-dep-77f876647c-g42vd   1/1     Running   1          23d

NAME                TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)    AGE
service/redis-svc   ClusterIP   10.97.105.16   <none>        6379/TCP   23d

NAME                        READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/redis-dep   1/1     1            1           23d

NAME                                   DESIRED   CURRENT   READY   AGE
replicaset.apps/redis-dep-77f876647c   1         1         1       23d

测试

使用如下步骤测试 redis 是否正常运行

[user@vm-centos-7 ~]$ kubectl -n redis exec -ti redis-dep-77f876647c-g42vd -- sh
# redis-cli
127.0.0.1:6379> auth Hello1234!!!!
OK
127.0.0.1:6379> config get requirepass
1) "requirepass"
2) "Hello1234!!!!"
127.0.0.1:6379>

使用

在同一个 Kubernetes 集群里面的应用, 可以通过 service 连接 redis

• service name: redis-svc.redis
• port: 6379