【8】K8s

阿里云国内75折 回扣 微信号：monov8
阿里云国际，腾讯云国际，低至75折。AWS 93折 免费开户实名账号 代冲值 优惠多多 微信号：monov8 飞机：@monov6

目录

1、NFS存储持久化

【1】所有节点安装NFS

【2】然后再主节点

【3】从节点

【4】数据挂载

2、PV8PVC

【1】创建pv池

【2】创建pv

【3】创建pvc

【4】创建Pod绑定PVC

3、ConfigMap

【1】创建配置redis保存到k8s的etcd

【2】创建pod

4、Secret

1、NFS存储持久化

【1】所有节点安装NFS

yum install -y nfs-utils

 

【2】然后再主节点

# nfs主节点

echo "/nfs/data/ *(insecure,rw,sync,no_root_squash)" > /etc/exports

mkdir -p /nfs/data

systemctl enable rpcbind --now

systemctl enable nfs-server --now

# 配置生效

exportfs -r

[root@master ~]# echo "/nfs/data/ *(insecure,rw,sync,no_root_squash)" > /etc/exports
[root@master ~]# mkdir -p /nfs/data
[root@master ~]# systemctl enable rpcbind --now
[root@master ~]# systemctl enable nfs-server --now
Created symlink from /etc/systemd/system/multi-user.target.wants/nfs-server.service to /usr/lib/systemd/system/nfs-server.service.
[root@master ~]# exportfs -r 
[root@master ~]# 
[root@master ~]# exportfs 
/nfs/data         <world>

 【3】从节点

#看一下远程的服务器有哪些目录可以挂载

showmount -e masterIP

#先在本机创建一个目录/nfs/data

#然后将远程服务器master的/nfs/data目录挂载到本机的/nfs/data目录

mkdir -p /nfs/data

mount -t nfs masteIP:/nfs/data /nfs/data

#写入一个测试文件

echo "hello nfs server" > /nfs/data/test.txt

[root@node02 ~]# showmount -e 172.31.0.4
Export list for 172.31.0.4:
/nfs/data *
[root@node02 ~]# mkdir -p /nfs/data
[root@node02 ~]# mount -t nfs 172.31.0.4:/nfs/data /nfs/data
[root@node02 ~]# ls /nfs/data/

 在主节点

[root@master data]# echo AAAAAAAA > 1111111
[root@master data]# ls
1111111

在从节点; 

[root@node02 ~]# ls /nfs/data/
1111111
[root@node02 ~]# echo 222222 > /nfs/data/222222
[root@node02 ~]# ls /nfs/data/
1111111  222222

 在主节点

[root@master data]# ls
1111111  222222

【4】数据挂载

写一个ymal

apiVersion: apps/v1
kind: Deployment
metadata: 
  labels: 
    app: nginx-pv
  name: nginx-pv
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nginx-pv
  template: 
    metadata: 
      labels: 
        app: nginx-pv
    spec:
      containers:
      - image: nginx
        name: nginx
        volumeMounts: 
        - name: html
          mountPath: /usr/share/nginx/html
      volumes:
        - name: html
          nfs: 
            server: 172.31.0.4
            path: /nfs/data/nginx-pv

执行yaml

[root@master ~]# vi nfs.ymal
[root@master ~]# 
[root@master ~]# 
[root@master ~]# kubectl apply -f nfs.ymal   
deployment.apps/nginx-pv created

#缺少/nfs/data/nginx-pv目录重新安装
[root@master ~]# mkdir /nfs/data/nginx-pv
[root@master ~]# kubectl delete -f nfs.ymal 
deployment.apps "nginx-pv" deleted
[root@master ~]# kubectl apply -f nfs.ymal 
deployment.apps/nginx-pv created

测试一下

在master

[root@master ~]# cd /nfs/data/nginx-pv/
[root@master nginx-pv]# ls

[root@master nginx-pv]# echo AAAAAAAAAAA > index.html
[root@master nginx-pv]# ls
index.html
[root@master nginx-pv]# kubectl get pod
NAME                            READY   STATUS    RESTARTS   AGE

nginx-pv-5f884c45b8-rk85j       1/1     Running   0          3m59s
nginx-pv-5f884c45b8-s5gxz       1/1     Running   0          3m59s




[root@master nginx-pv]# 
[root@master nginx-pv]# kubectl exec -it nginx-pv-5f884c45b8-rk85j -- /bin/bash
root@nginx-pv-5f884c45b8-rk85j:/# 
root@nginx-pv-5f884c45b8-rk85j:/# cd /usr/share/nginx

root@nginx-pv-5f884c45b8-rk85j:/usr/share/nginx# cd html/
root@nginx-pv-5f884c45b8-rk85j:/usr/share/nginx/html# cat index.html 
AAAAAAAAAAA

2、PV8PVC

PV:持久卷(Persistent Volume)将应用筹要持久化的数据保存到指定位置

PVC持久卷申明Persistent Volume Claim)申明需要使用时持久卷规格

【1】创建pv池

#nfs主节点

mkdir -p /nfs/data/01

mkdir -p /nfs/data/02

mkdir -p /nfs/data/03

[root@master nginx-pv]# mkdir -p /nfs/data/01
[root@master nginx-pv]# mkdir -p /nfs/data/02
[root@master nginx-pv]# mkdir -p /nfs/data/03

【2】创建pv

写一个ymal文件

apiVersion: v1
kind: PersistentVolume
metadata: 
  name: pv01-10m
spec:
  capacity:
    storage: 10M
  accessModes: 
    - ReadWriteMany
  storageClassName: nfs
  nfs: 
    path: /nfs/data/01
    server: 172.31.0.4
---
apiVersion: v1
kind: PersistentVolume
metadata: 
  name: pv02-1gi
spec:
  capacity:
    storage: 1Gi
  accessModes: 
    - ReadWriteMany
  storageClassName: nfs
  nfs: 
    path: /nfs/data/02
    server: 172.31.0.4
---
apiVersion: v1
kind: PersistentVolume
metadata: 
  name: pv03-3gi
spec:
  capacity:
    storage: 3Gi
  accessModes: 
    - ReadWriteMany
  storageClassName: nfs
  nfs: 
    path: /nfs/data/03
    server: 172.31.0.4

[root@master nginx-pv]# vi pv.yaml

[root@master nginx-pv]# kubectl apply -f pv.yaml 
persistentvolume/pv01-10m created
persistentvolume/pv02-1gi created
persistentvolume/pv03-3gi created
[root@master nginx-pv]# kubectl get pv
NAME       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM   STORAGECLASS   REASON   AGE
pv01-10m   10M        RWX            Retain           Available           nfs                     36s
pv02-1gi   1Gi        RWX            Retain           Available           nfs                     36s
pv03-3gi   3Gi        RWX            Retain           Available           nfs                     36s

【3】创建pvc

用yaml的方式

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: nginx-pvc
spec:
  accessModes: 
    - ReadWriteMany
  resources:
    requests:
      storage: 200Mi
  storageClassName: nfs

[root@master ~]# vi pvc.yaml

[root@master ~]# kubectl apply -f pvc.yaml 
persistentvolumeclaim/nginx-pvc created
[root@master ~]# kubectl get pvc
NAME        STATUS   VOLUME     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
nginx-pvc   Bound    pv02-1gi   1Gi        RWX            nfs            42s
[root@master ~]# kubectl get pv
NAME       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM               STORAGECLASS   REASON   AGE
pv01-10m   10M        RWX            Retain           Available                       nfs                     13m
pv02-1gi   1Gi        RWX            Retain           Bound       default/nginx-pvc   nfs                     13m
pv03-3gi   3Gi        RWX            Retain           Available                       nfs                     13m
[root@master ~]#

【4】创建Pod绑定PVC

apiVersion: apps/v1
kind: Deployment
metadata: 
  labels: 
    app: nginx-deploy-pvc
  name: nginx-deploy-pvc
spec: 
  replicas: 2
  selector:
    matchLabels:
      app: nginx-deploy-pvc
  template: 
    metadata:
      labels:
        app: nginx-deploy-pvc
    spec:
      containers:
      - image: nginx
        name: nginx
        volumeMounts: 
        - name: html
          mountPath: /usr/share/nginx/html
      volumes:
        - name: html
          persistentVolumeClaim:
            claimName: nginx-pvc

aster ~]# vi pod_pvc.yaml
[root@master ~]# 
[root@master ~]# 
[root@master ~]# kubectl apply -f pod_pvc.yaml 
deployment.apps/nginx-deploy-pvc created
[root@master ~]# kubectl get pvc,pv
NAME                              STATUS   VOLUME     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
persistentvolumeclaim/nginx-pvc   Bound    pv02-1gi   1Gi        RWX            nfs            11m

NAME                        CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM               STORAGECLASS   REASON   AGE
persistentvolume/pv01-10m   10M        RWX            Retain           Available                       nfs                     23m
persistentvolume/pv02-1gi   1Gi        RWX            Retain           Bound       default/nginx-pvc   nfs                     23m
persistentvolume/pv03-3gi   3Gi        RWX            Retain           Available                       nfs

3、ConfigMap

【1】创建配置redis保存到k8s的etcd

kubectl create cm redis-config --from-file=redis.conf

kubectl get cm

[root@master ~]# echo appendonly yes > vi redis.conf
[root@master ~]# kubectl create cm redis.conf --from-file=redis.conf
configmap/redis.conf created
[root@master ~]# kubectl get cm
NAME               DATA   AGE
kube-root-ca.crt   1      5d17h
redis.conf         1      11s


[root@master ~]# kubectl get cm redis.conf -oyaml
apiVersion: v1
data:
  redis.conf: |
    appendonly yes
kind: ConfigMap
metadata:
  creationTimestamp: "2023-01-11T08:52:39Z"
  managedFields:
  - apiVersion: v1
    fieldsType: FieldsV1
    fieldsV1:
      f:data:
        .: {}
        f:redis.conf: {}
    manager: kubectl-create
    operation: Update
    time: "2023-01-11T08:52:39Z"
  name: redis.conf
  namespace: default
  resourceVersion: "78979"
  uid: 9ce6bc39-16e4-4c88-9380-3440ac787099

 【2】创建pod

apiVersion: v1
kind: Pod
metadata: 
  name: redis
spec: 
  containers:
  - name: redis
    image: redis
    command:
      - redis-server
      - "/redis-master/redis.conf"
    ports:
    - containerPort: 6379
    volumeMounts: 
    - mountPath: /data
      name: data
    - mountPath: /redis-master
      name: config
  volumes:
    - name: data
      emptyDir: {}
    - name: config
      configMap: 
        name: redis-config
        items:
        - key: redis.config
          path: redis.config  

[root@master ~]# vi pod1.yaml

[root@master ~]# kubectl apply -f pod1.yaml 
pod/redis created
[root@master ~]#

4、Secret

kubectl create secret docker-registry regcred \
    --docker-server=<镜像仓库服务器> \
    --docker-username=<用户名> \
    --docker-password=<密码> \
    --docker-email=<邮箱地址>

管理员执行上面命令后执行下面yaml就可以从私有仓库中下载安装Pod

apiVersion: v1
kind: Pod
metadata: 
  name: private-nginx
spec:
  containers:
  - name: private-nginx
    image: qrxqrx/nginx:v1.0
  imagePullSecret:
  - name: regcred

kubectl apply -f mypod.yaml

阿里云国内75折 回扣 微信号：monov8
阿里云国际，腾讯云国际，低至75折。AWS 93折 免费开户实名账号 代冲值 优惠多多 微信号：monov8 飞机：@monov6
标签: k8s
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