8.1 k8s使用PV/PVC做数据持久化运行redis服务，数据保存至NFS

1.制作redis docker镜像

1.1 准备alpine基础镜像

# 下载
docker pull alpine:3.13

# 更改tag
docker tag alpine:3.13 192.168.1.110/base/alpine:3.13

# 上传到本地harbor
docker push 192.168.1.110/base/alpine:3.13

1.2 准备redis安装包及配置文件

下载redis安装包

wget http://download.redis.io/releases/redis-4.0.14.tar.gz

修改redis.conf

tar xf redis-4.0.14.tar.gz

cp redis-4.0.14/redis.conf .

vim redis.conf
...
save 5 1
save 900 1
save 300 10
save 60 10000

dbfilename dump.rdb

dir /data/
...

镜像中redis的启动脚本

cat run_redis.sh
#!/bin/bash
/usr/local/redis/bin/redis-server /etc/redis.conf

tail -f /etc/hosts

1.3 编写Dockerfile

FROM 192.168.1.110/base/alpine:3.13

ADD redis-4.0.14.tar.gz /tmp/
ADD run_redis.sh /usr/local/redis/
ADD redis.conf /etc/redis.conf
RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories \
    && apk add gcc g++ make libffi-dev openssl-dev libtool \
    && mkdir /data/redisdata -p \
    && cd /tmp/redis-4.0.14 \
    && make PREFIX=/usr/local/redis install \
    && rm -rf /tmp/redis-4.0.14

EXPOSE 6379

CMD ["/usr/local/redis/run_redis.sh"]

1.4 制作镜像并上传到本地harbor

# ls -l
总用量 1772
-rw-r--r-- 1 root root     471 10月 22 14:37 Dockerfile
-rw-r--r-- 1 root root 1740967 10月 22 13:58 redis-4.0.14.tar.gz
-rw-r--r-- 1 root root   58792 10月 22 16:30 redis.conf
-rwxr-xr-x 1 root root      82 10月 22 14:15 run_redis.sh

# docker build -t 192.168.1.110/base/alpine3.13-redis4.0.14:v20211022-1631 .

# docker push 192.168.1.110/base/alpine3.13-redis4.0.14:v20211022-1631

2.为redis数据存储部署PV/PVC

2.1 NFS server创建目录

mkdir /data/k8s-data/redis/datadir-pv-1 -p

2.2 编写pv/pvc yaml

apiVersion: v1
kind: PersistentVolume
metadata:
  name: redis-datadir-pv-1
spec:
  capacity:
    storage: 20Gi
  accessModes:
    - ReadWriteOnce
  nfs:
    server: 192.168.2.10
    path: /data/k8s-data/redis/datadir-pv-1
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: redis-datadir-pvc-1
  namespace: yan-test
spec:
  accessModes:
    - ReadWriteOnce
  volumeName: redis-datadir-pv-1
  resources:
    requests:
      storage: 10Gi

2.3 创建pv/pvc并验证

创建namespace

# kubectl create ns yan-test

创建pv/pvc

# kubectl apply -f redis_pv_pvc.yaml

验证

# kubectl get pv
NAME                     CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                           STORAGECLASS   REASON   AGE
redis-datadir-pv-1       20Gi       RWO            Retain           Bound    yan-test/redis-datadir-pvc-1                            78m

# kubectl get pvc -n yan-test
NAME                  STATUS   VOLUME               CAPACITY   ACCESS MODES   STORAGECLASS   AGE
redis-datadir-pvc-1   Bound    redis-datadir-pv-1   20Gi       RWO                           78m

3.在k8s上部署redis

3.1 编写yaml

# cat redis_svc_deploy.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: redis-deployment
  labels:
    app: redis
  namespace: yan-test
spec:
  replicas: 1
  selector:
    matchLabels:
      app: redis
  template:
    metadata:
      labels:
        app: redis
    spec:
      containers:
      - name: redis-container
        image: 192.168.1.110/base/alpine3.13-redis4.0.14:v20211022-1631
        imagePullPolicy: IfNotPresent
        volumeMounts:
        - mountPath: /data/
          name: redis-data
      volumes:
      - name: redis-data
        persistentVolumeClaim:
          claimName: redis-datadir-pvc-1
---
apiVersion: v1
kind: Service
metadata:
  name: redis-svc
  namespace: yan-test
spec:
  ports:
  - name: http
    port: 6379
    targetPort: 6379
    nodePort: 36379
  type: NodePort
  selector:
    app: redis

3.2 创建redis

# kubectl apply -f redis_svc_deploy.yaml

3.3 验证是否创建成功

root@k8-deploy:~/k8s-yaml/redis# kubectl get svc -n yan-test
NAME        TYPE       CLUSTER-IP    EXTERNAL-IP   PORT(S)          AGE
redis-svc   NodePort   10.0.12.138   <none>        6379:36379/TCP   36m

root@k8-deploy:~/k8s-yaml/redis# kubectl get pod -n yan-test
NAME                                READY   STATUS    RESTARTS   AGE
redis-deployment-75b9b94b64-rtj95   1/1     Running   0          36m

4.验证redis服务及数据存储是否正常

# 通过Nodeport端口连接redis
root@k8-deploy:~/k8s-yaml/redis# redis-cli -h 192.168.2.17 -p 36379
192.168.2.17:36379> INFO
# Server
redis_version:4.0.14
redis_git_sha1:00000000
...

# 写入数据测试
192.168.2.17:36379> DBSIZE
(integer) 0
192.168.2.17:36379> set a 1
OK

# 查看NFSsever上redis的目录是否有redis的数据文件
root@k8-deploy:~/k8s-yaml/redis# ls /data/k8s-data/redis/datadir-pv-1/
dump.rdb   redis.log