Kubernetes部署有状态服务-Redis

安装nfs

我这边就选择k8s-master作为nfs存储了

yum install -y nfs-utils
#在 /etc/exports 添加
/nfs/volumes *(async,insecure,no_root_squash,no_subtree_check,rw)
# 创建nfs挂载目录
mkdir -p /nfs/volumes
#启动服务
systemctl start rpcbind & systemctl enable rpcbind
systemctl start nfs-server & systemctl enable nfs-server
#查看nfs状态
showmount -e k8s-master
#创建存储
cd /nfs/volumes
mkdir data_redis
mkdir conf_redis  #需要准备一份redis配置文件，配置文件里面相关的存储数据、pid、log等我是放在容器的/data下的

创建PV

apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv-redis
spec:
  volumeMode: Filesystem
  capacity:
    storage: 2Gi
  accessModes:
    - ReadWriteMany
  nfs:
    path: /nfs/volumes/data_redis
    server: k8s-master

创建PV

kubectl apply -f pv-redis.yaml

创建pvc

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: pvc-redis
spec:
  accessModes:
    - ReadWriteMany
  volumeMode: Filesystem
  resources:
    requests:
      storage: 2Gi

创建pvc

kubectl apply -f pvc-redis.yaml

创建configmap

kubectl create configmap redis-configmap --from-file=/nfs/volumes/conf_redis/redis.conf

创建headless

apiVersion: v1
kind: Service
metadata:
  name: headless-redis
spec:
  clusterIP: None
  selector:
    app: statefulset-redis
  ports:
    - port: 6379

创建headless

kubectl apply -f headless-redis.yaml

创建statefulset

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: statefulset-redis
spec:
  serviceName: headless-redis
  selector:
    matchLabels:
      app: statefulset-redis
  template:
    metadata:
      labels:
        app: statefulset-redis
    spec:
      volumes:
        - name: redis-conf
          configMap:
            name: redis-configmap
        - name: data-redis
          persistentVolumeClaim:
            claimName: pvc-redis
      containers:
        - name: redis
          image: redis:5.0.5
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 6379
          volumeMounts:
            - mountPath: /data/redis.conf
              name: redis-conf
              subPath: redis.conf
            - mountPath: /data
              name: data-redis
          command:
            - redis-server
            - /data/redis.conf

创建headless

kubectl apply -f statefulset-redis.yaml

问题

在部署statefulset的时候出现下面这个问题，pod的状态一会completed，一会CrashLoopBackOff


解决：花了很多时间去研究，describe和log指令也没有提供有用的报错信息，最后发现是配置文件的daemonize配置项的问题，因为redis.conf是我之前改过的，daemonize默认是no，我改成了yes会出现这种问题，所以daemonize保持默认的no即可。