1.切换root
1.关闭centos自带的防火墙 # systemctl disable firewalld # systemctl stop firewalld 2.安装etcd和kubernetes软件（会自动安装docker） # yum install -y etcd kubernetes
2.修改两处配置
Docker配置文件/etc/sysconfig/docker, OPTIONS=’–selinux-enabled=false –insecure-registry gcr.io’
Kubernetes apiservce配置文件/etc/kubernetes/apiserver,把–admission_control参数钟的ServiceAccount删除
3.启动所有服务
[root@localhost kubernetes]# systemctl start etcd [root@localhost kubernetes]# systemctl start docker [root@localhost kubernetes]# systemctl start kube-apiserver [root@localhost kubernetes]# systemctl start kube-controller-manager [root@localhost kubernetes]# systemctl start kube-scheduler [root@localhost kubernetes]# systemctl start kubelet [root@localhost kubernetes]# systemctl start kube-proxy
测试，查看
部署nginx服务
[root@localhost kubernetes]# docker image ls REPOSITORY TAG IMAGE ID CREATED SIZE docker.io/nginx latest 5699ececb21c Less than a second ago 109 MB docker.io/ubuntu 16.04 5e8b97a2a082 24 hours ago 114 MB hongdada/nginx v3 c5cf58738d6b 3 days ago 109 MB docker.io/busybox latest 8c811b4aec35 2 weeks ago 1.15 MB docker.io/tomcat latest 33e02377a00f 8 weeks ago 554 MB [root@localhost kubernetes]# kubectl run my-nginx --image=hongdada/nginx:v3 --port=80 deployment "my-nginx" created [root@localhost kubernetes]# kubectl get pod NAME READY STATUS RESTARTS AGE my-nginx-3156591236-q1jvn 0/1 ContainerCreating 0 11s
创建gcr.io/google_containers/pause-amd64:3.0镜像
[root@localhost kubernetes]# docker pull googlecontainer/pause-amd64:3.0 Trying to pull repository docker.io/googlecontainer/pause-amd64 ... 3.0: Pulling from docker.io/googlecontainer/pause-amd64 4f4fb700ef54: Pull complete ce150f7a21ec: Pull complete Digest: sha256:f04288efc7e65a84be74d4fc63e235ac3c6c603cf832e442e0bd3f240b10a91b Status: Downloaded newer image for docker.io/googlecontainer/pause-amd64:3.0 [root@localhost kubernetes]# docker tag googlecontainer/pause-amd64:3.0 gcr.io/google_containers/pause-amd64:3.0 [root@localhost kubernetes]# docker image ls REPOSITORY TAG IMAGE ID CREATED SIZE docker.io/nginx latest 5699ececb21c Less than a second ago 109 MB docker.io/ubuntu 16.04 5e8b97a2a082 24 hours ago 114 MB hongdada/nginx v3 c5cf58738d6b 3 days ago 109 MB docker.io/busybox latest 8c811b4aec35 2 weeks ago 1.15 MB docker.io/tomcat latest 33e02377a00f 8 weeks ago 554 MB docker.io/googlecontainer/pause-amd64 3.0 99e59f495ffa 2 years ago 747 kB gcr.io/google_containers/pause-amd64 3.0 99e59f495ffa 2 years ago 747 kB
kubernetes指令：
# 查看版本 $ kubectl version Client Version: version.Info{Major:"1", Minor:"5", GitVersion:"v1.5.2", GitCommit:"269f928217957e7126dc87e6adfa82242bfe5b1e", GitTreeState:"clean", BuildDate:"2017-07-03T15:31:10Z", GoVersion:"go1.7.4", Compiler:"gc", Platform:"linux/amd64"} Server Version: version.Info{Major:"1", Minor:"5", GitVersion:"v1.5.2", GitCommit:"269f928217957e7126dc87e6adfa82242bfe5b1e", GitTreeState:"clean", BuildDate:"2017-07-03T15:31:10Z", GoVersion:"go1.7.4", Compiler:"gc", Platform:"linux/amd64"} # 显示集群信息 $ kubectl cluster-info Kubernetes master is running at http://localhost:8080 To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'. # 查看集群中有几个Node $ kubectl get nodes NAME STATUS AGE 127.0.0.1 Ready 8m # 运行一个镜像 $ kubectl run my-nginx --image=nginx --replicas=2 --port=80 deployment "my-nginx" created # 查看pod $ kubectl get pods NAME READY STATUS RESTARTS AGE my-nginx-379829228-cwlbb 0/1 ContainerCreating 0 20s my-nginx-379829228-czk6w 1/1 Running 0 20s # 查看服务详情信息 $ kubectl describe pod my-nginx-379829228-cwlbb Name: my-nginx-3156591236-q1jvn Namespace: default Node: 127.0.0.1/127.0.0.1 Start Time: Thu, 07 Jun 2018 05:33:48 +0800 Labels: pod-template-hash=3156591236 run=my-nginx Status: Pending IP: Controllers: ReplicaSet/my-nginx-3156591236 Containers: my-nginx: Container ID: Image: hongdada/nginx:v3 Image ID: Port: 80/TCP State: Waiting Reason: ContainerCreating Ready: False Restart Count: 0 Volume Mounts: <none> Environment Variables: <none> Conditions: Type Status Initialized True Ready False PodScheduled True No volumes. QoS Class: BestEffort Tolerations: <none> Events: FirstSeen LastSeen Count From SubObjectPath Type Reason Message --------- -------- ----- ---- ------------- -------- ------ ------- 2m 2m 1 {default-scheduler } Normal Scheduled Successfully assigned my-nginx-3156591236-q1jvn to 127.0.0.1 2m 45s 4 {kubelet 127.0.0.1} Warning FailedSync Error syncing pod, skipping: failed to "StartContainer" for "POD" with ErrImagePull: "image pull failed for registry.access.redhat.com/rhel7/pod-infrastructure:latest, this may be because there are no credentials on this request. details: (open /etc/docker/certs.d/registry.access.redhat.com/redhat-ca.crt: no such file or directory)" 1m 3s 7 {kubelet 127.0.0.1} Warning FailedSync Error syncing pod, skipping: failed to "StartContainer" for "POD" with ImagePullBackOff: "Back-off pulling image "registry.access.redhat.com/rhel7/pod-infrastructure:latest"" # 查看已部署 $ kubectl get deployments NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE my-nginx 1 1 1 0 3m # 删除pod $ kubectl delete pod my-nginx-3156591236-q1jvn pod "my-nginx-3156591236-q1jvn" deleted # 再次查看pod，发现由于replicas机制，pod又生成一个新的 $ kubectl get pods NAME READY STATUS RESTARTS AGE my-nginx-3156591236-qm0fq 0/1 ContainerCreating 0 8s # 删除部署的my-nginx服务。彻底删除pod $ kubectl delete deployment my-nginx deployment "my-nginx" deleted # 再次查看pod $ kubectl get pods No resources found.
对比docker命令：
# docker run $ docker run -d -e DOMAIN=cluster --name my-nginx -p 80:80 nginx $ kubectl run my-nginx --image=nginx --port=80 --env="DOMAIN=cluster" # docker ps $ docker ps $ kubectl get pods # docker exec $ docker exec [容器id] ls $ kubectl exec [pod_id] ls # docker exec 交互式 $ docker exec -it [容器id] /bin/sh $ kubectl exec -it [pod_id] -- /bin/sh # docker info $ docker info $ kubectl cluster-info
yaml文件管理服务：
用yaml文件来创建服务，创建nginx.yaml文件
apiVersion: extensions/v1beta1 kind: Deployment metadata: name: my-nginx spec: replicas: 3 template: metadata: labels: app: nginx spec: containers: - name: nginx image: hongdada/nginx:v3 ports: - containerPort: 80
启动管理服务：
# 根据yaml文件创建服务 $ kubectl create -f nginx.yaml deployment "my-nginx" created # 查看deployment $ kubectl get deployments NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE my-nginx 3 3 3 0 17s # 查看Pod $ kubectl get pod NAME READY STATUS RESTARTS AGE my-nginx-3552297034-60v0h 0/1 ContainerCreating 0 9s my-nginx-3552297034-pwxfr 0/1 ContainerCreating 0 9s my-nginx-3552297034-zlxrn 0/1 ContainerCreating 0 9s # 根据yaml文件删除服务 $ kubectl delete -f nginx.yaml deployment "my-nginx" deleted $ kubectl get pod No resources found. $ kubectl get deployment No resources found.
Service：
我们创建一个nginx服务
[root@localhost kubernetes]# kubectl run my-nginx --image=hongdada/nginx:v3 --port=80 deployment "my-nginx" created [root@localhost kubernetes]# kubectl expose deployment/my-nginx --type="NodePort" --port 80 service "my-nginx" exposed [root@localhost kubernetes]# kubectl get services NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes 10.254.0.1 <none> 443/TCP 16h my-nginx 10.254.51.51 <nodes> 80:31377/TCP 10s