云计算day10-Kubernetes_K8s

1. deployment资源

有rc在滚动升级之后,会造成服务访问中断,于是k8s引入了deployment资源

如果这个POD出现了故障的话，我们的服务也就挂了，所以 kubernetest提供了一个 Deployment的概念，可去管理POD的副本，也就是副本集，这样就可以保证一定数量的副本是可用的，不会以为一个pod挂掉导致整个服务挂掉。

cd k8s_yaml/
mkdir deploy
cd deploy/

[root@k8s-master deploy]# cat k8s_delpoy.yaml
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  replicas: 3
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: 10.0.0.11:5000/nginx:1.13
        ports:
        - containerPort: 80
        resources:  
          limits:
            cpu: 100m
          requests:
            cpu: 100m

[root@k8s-master deploy]# kubectl create -f k8s_delpoy.yaml 
[root@k8s-master deploy]# kubectl get deployment 
NAME               DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
nginx-deployment   3         3         3            3           8m
[root@k8s-master deploy]# kubectl get pod
NAME                                READY     STATUS    RESTARTS   AGE
nginx                               1/1       Running   3          4d
nginx-5mf4r                         1/1       Running   1          3d
nginx-deployment-3014407781-1msh5   1/1       Running   0          4m
nginx-deployment-3014407781-67f4s   1/1       Running   0          4m
nginx-deployment-3014407781-tj854   1/1       Running   0          4m

[root@k8s-master deploy]# kubectl expose deployment nginx-deployment --type=NodePort --port=80

[root@k8s-master deploy]# kubectl get svc 
NAME               CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
kubernetes         10.254.0.1      <none>        443/TCP        4d
myweb              10.254.173.22   <nodes>       80:30000/TCP   3d
nginx              10.254.22.101   <nodes>       80:4336/TCP    3d
nginx-deployment   10.254.87.197   <nodes>       80:40510/TCP   8m

[root@k8s-master deploy]# curl  -I 10.0.0.12:40510
HTTP/1.1 200 OK
Server: nginx/1.13.12
Date: Mon, 16 Sep 2019 02:10:10 GMT
Content-Type: text/html
Content-Length: 612
Last-Modified: Tue, 02 Oct 2018 14:49:27 GMT
Connection: keep-alive
ETag: "5bb38577-264"
Accept-Ranges: bytes


#修改配置文件中的此行改为nginx 1.15
[root@k8s-master deploy]# kubectl edit deployment nginx-deployment
      - image: 10.0.0.11:5000/nginx:1.15
image
[root@k8s-master deploy]# kubectl rollout history deployment nginx-deployment 
deployments "nginx-deployment"
REVISION    CHANGE-CAUSE
5       <none>
6       <none>

#回滚的命令
[root@k8s-master deploy]# kubectl rollout undo deployment nginx-deployment 
deployment "nginx-deployment" rolled back
[root@k8s-master deploy]# curl  -I 10.0.0.12:40510
HTTP/1.1 200 OK
Server: nginx/1.13.12

#再执行回滚命令
[root@k8s-master deploy]# kubectl rollout undo deployment nginx-deployment 
deployment "nginx-deployment" rolled back
[root@k8s-master deploy]# curl  -I 10.0.0.12:40510
HTTP/1.1 200 OK
Server: nginx/1.15.5


#再run一个资源
[root@k8s-master deploy]# kubectl run lcx --image=10.0.0.11:5000/nginx:1.13 --replicas=3
deployment "lcx" created
[root@k8s-master deploy]# kubectl rollout history deployment lcx 
deployments "lcx"
REVISION    CHANGE-CAUSE
1       <none>

#删除资源
[root@k8s-master deploy]# kubectl delete deployment lcx 
deployment "lcx" deleted

#run一个资源
[root@k8s-master deploy]# kubectl run lcx --image=10.0.0.11:5000/nginx:1.13 --replicas=3 --record 
deployment "lcx" created
[root@k8s-master deploy]# kubectl rollout history deployment lcx 
deployments "lcx"
REVISION    CHANGE-CAUSE
1       kubectl run lcx --image=10.0.0.11:5000/nginx:1.13 --replicas=3 --record

#修改配置为nginx:1.15
[root@k8s-master deploy]# kubectl edit deployment lcx
    spec:
      containers:
      - image: 10.0.0.11:5000/nginx:1.15

[root@k8s-master deploy]# kubectl rollout history deployment lcx 
deployments "lcx"
REVISION    CHANGE-CAUSE
1       kubectl run lcx --image=10.0.0.11:5000/nginx:1.13 --replicas=3 --record
2       kubectl edit deployment lcx     #将执行的命令记录了下来

#再次更新版本为1.16
[root@k8s-master deploy]# kubectl edit deployment lcx
    spec:
      containers:
      - image: 10.0.0.11:5000/nginx:1.16

#查看还是不显示版本
[root@k8s-master deploy]# kubectl rollout history deployment lcx 
deployments "lcx"
REVISION    CHANGE-CAUSE
1       kubectl run lcx --image=10.0.0.11:5000/nginx:1.13 --replicas=3 --record
2       kubectl edit deployment lcx
3       kubectl edit deployment lcx

#因为不显示版本，所以要引用一条新的命令
[root@k8s-master deploy]# kubectl set image deploy lcx lcx=10.0.0.11:5000/nginx:1.15
deployment "lcx" image updated


#第二条执行的命令已经回滚为nginx:1.15了
[root@k8s-master deploy]# kubectl rollout history deployment lcx 
deployments "lcx"
REVISION    CHANGE-CAUSE
1       kubectl run lcx --image=10.0.0.11:5000/nginx:1.13 --replicas=3 --record
3       kubectl edit deployment lcx
4       kubectl set image deploy lcx lcx=10.0.0.11:5000/nginx:1.15

2. tomcat+mysql练习

在k8s中容器之间相互访问,通过VIP地址!

2.1搭建过程(截图较多)

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2.2 扩展—实现wordpress

version: '3'

services:
   db:
     image: mysql:5.7
     volumes:
       - /data/db_data:/var/lib/mysql
     restart: always
     environment:
       MYSQL_ROOT_PASSWORD: somewordpress
       MYSQL_DATABASE: wordpress
       MYSQL_USER: wordpress
       MYSQL_PASSWORD: wordpress

   wordpress:
     depends_on:
       - db
     image: wordpress:latest
     volumes:
       - /data/web_data:/var/www/html
     ports:
       - "80:80"
     restart: always
     environment:
       WORDPRESS_DB_HOST: db
       WORDPRESS_DB_USER: wordpress
       WORDPRESS_DB_PASSWORD: wordpress
image
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3 .k8s的附加组件

3.1 dns服务()

作用：把svc的名字解析成VIP的地址

kubectl get all -n kube-system  -o wide

#1:下载dns_docker镜像包
wget http://192.168.12.202/docker_image/docker_k8s_dns.tar.gz

#2:导入dns_docker镜像包(node1节点)

#3:修改skydns-rc.yaml,  在node1 创建dns服务
spec:
  nodeSelector:
    kubernetes.io/hostname: 10.0.0.12
  containers:   

#4:创建dns服务
kubectl  create  -f   skydns-deploy.yaml
kubectl create -f skydns-svc.yaml

#5:检查
kubectl get all --namespace=kube-system

#6:修改所有node节点kubelet的配置文件
vim  /etc/kubernetes/kubelet
KUBELET_ARGS="--cluster_dns=10.254.230.254 --cluster_domain=cluster.local"
​
systemctl   restart kubelet
image

3.2 namespace命令空间

namespace做资源隔离

[root@k8s-master wordpress_demo]# kubectl  get namespace 
NAME          STATUS    AGE
default       Active    5d
kube-system   Active    5d

#增
kubectl create namespace lcx

#删
kubectl delete namespace lcx

测试

[root@k8s-master wordpress_demo]# pwd
/root/k8s_yaml/wordpress_demo

#创建wordpress的空间
[root@k8s-master wordpress_demo]# kubectl create namespace wordpress
namespace "wordpress" created


#删除当前的环境
[root@k8s-master wordpress_demo]# kubectl delete -f .

#修改所以配置文件添加namespace空间
[root@k8s-master wordpress_demo]# ls 
mysql-rc.yml  mysql-svc.yml  wordpress-rc.yml  wordpress-svc.yml
[root@k8s-master wordpress_demo]# sed -i '3a \ \ namespace: wordpress' *

#创建新环境
[root@k8s-master wordpress_demo]# kubectl create -f .
replicationcontroller "wordpress-db" created
service "wordpress-db" created
replicationcontroller "wordpress-web" created
service "wordpress-web" created


#查看wordpress的空间
[root@k8s-master wordpress_demo]# kubectl get all -n wordpress 
NAME               DESIRED   CURRENT   READY     AGE
rc/wordpress-db    1         1         1         1m
rc/wordpress-web   1         1         1         1m

NAME                CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
svc/wordpress-db    10.254.47.172   <none>        3306/TCP       1m
svc/wordpress-web   10.254.226.90   <nodes>       80:30009/TCP   1m

NAME                     READY     STATUS    RESTARTS   AGE
po/wordpress-db-dv5f4    1/1       Running   0          1m
po/wordpress-web-v3bqd   1/1       Running   0          1m

访问一下 10.0.0.12:30009

image

yum install dos2unix.x86_64
dos2unix <文件名>  可以修复排版问题
image
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