1，kubectl run
創建pods
[root@master ~]# kubectl run nginx-deploy --image=nginx:1.14-alpine --port=80 --replicas=1
[root@master ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-deploy-7689897d8d-7wr6d 1/1 Running 0 17s
[root@master ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-deploy-7689897d8d-7wr6d 1/1 Running 0 24s 10.244.1.12 node01 <none> <none>
[root@master ~]# kubectl get deployment
NAME READY UP-TO-DATE AVAILABLE AGE
nginx-deploy 1/1 1 1 119s
訪問：
[root@node01 ~]# curl 10.244.1.12
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
[root@node01 ~]#
創建svc：
[root@master ~]# kubectl expose deployment nginx-deploy --name=nginx --port=80 --target-port=80 --protocol=TCP
service/nginx exposed
[root@master ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 5d3h
nginx ClusterIP 10.101.119.241 <none> 80/TCP 8s
下載bind-utils：
[root@master ~]# yum install -y bind-utils
run一個client：
[root@master ~]# kubectl run client --image=busybox --replicas=1 -it --restart=Never
If you don't see a command prompt, try pressing enter.
/ # cat /etc/resolv.conf
nameserver 10.96.0.10
search default.svc.cluster.local svc.cluster.local cluster.local
options ndots:5
[root@master ~]# dig -t A nginx.default.svc.cluster.local svc.cluster.local @10.96.0.10
在client訪問：
/ # wget -O - -q http://nginx:80/
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
/ #
編輯服務nginx：
[root@master ~]# kubectl edit svc nginx
更新鏡像：
[root@master ~]# kubectl set image deployment myapp myapp=ikubernetes/myapp:v2
deployment.extensions/myapp image updated
宿主機訪問：
[root@master ~]# kubectl edit svc myapp
# Please edit the object below. Lines beginning with a '#' will be ignored,
# and an empty file will abort the edit. If an error occurs while saving this file will be
# reopened with the relevant failures.
#
apiVersion: v1
kind: Service
metadata:
creationTimestamp: "2019-09-23T07:15:21Z"
labels:
run: myapp
name: myapp
namespace: default
resourceVersion: "102661"
selfLink: /api/v1/namespaces/default/services/myapp
uid: 6c482a98-0065-4a04-89e1-e74847898327
spec:
clusterIP: 10.106.65.163
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
run: myapp
sessionAffinity: None
type: NodePort
[root@master ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 5d4h
myapp NodePort 10.106.65.163 <none> 80:30167/TCP 13m
nginx ClusterIP 10.101.119.241 <none> 80/TCP 41m
2，kubernetes資源清單定義入門
apiVersion：group/cersion
[root@master ~]# kubectl api-versions
admissionregistration.k8s.io/v1beta1
apiextensions.k8s.io/v1beta1
apiregistration.k8s.io/v1
apiregistration.k8s.io/v1beta1
apps/v1
apps/v1beta1
apps/v1beta2
authentication.k8s.io/v1
authentication.k8s.io/v1beta1
authorization.k8s.io/v1
authorization.k8s.io/v1beta1
autoscaling/v1
autoscaling/v2beta1
autoscaling/v2beta2
batch/v1
batch/v1beta1
certificates.k8s.io/v1beta1
coordination.k8s.io/v1
coordination.k8s.io/v1beta1
events.k8s.io/v1beta1
extensions/v1beta1
networking.k8s.io/v1
networking.k8s.io/v1beta1
node.k8s.io/v1beta1
policy/v1beta1
rbac.authorization.k8s.io/v1
rbac.authorization.k8s.io/v1beta1
scheduling.k8s.io/v1
scheduling.k8s.io/v1beta1
storage.k8s.io/v1
storage.k8s.io/v1beta1
v1
[root@master ~]#
kind：資源類別
metadata：元數據
name
namespace
annotations
spec：期望狀態
status：當前狀態
編寫一個資源清單：
[root@master manifests]# vi pod-demo.yaml
apiVersion: v1
kind: Pod
metadata:
name: pod-demo
namespace: default
labels:
app: myapp
tier: frontend
spec:
containers:
- name: myapp
image: ikubernetes/myapp:v1
- name: busybox
image: busybox:latest
command:
- "/bin/sh"
- "-c"
- "sleep 3600"
創建pod：
[root@master manifests]# kubectl create -f pod-demo.yaml
pod/pod-demo created
3，pod控制器應用
標籤：
key=value
key：字母、數字、_、-、.
value：可以爲空，只能字母或數字開頭及結尾
查看標籤：
[root@master manifests]# kubectl get pods --show-labels
NAME READY STATUS RESTARTS AGE LABELS
client 0/1 Completed 0 117m run=client
myapp-746644f8d6-2msxj 1/1 Running 0 92m pod-template-hash=746644f8d6,run=myapp
myapp-746644f8d6-ch5n2 1/1 Running 0 92m pod-template-hash=746644f8d6,run=myapp
nginx-deploy-7689897d8d-rvp28 1/1 Running 0 132m pod-template-hash=7689897d8d,run=nginx-deploy
[root@master manifests]#
[root@master manifests]# kubectl get pods -l app
NAME READY STATUS RESTARTS AGE
pod-demo 2/2 Running 0 19s
[root@master manifests]#
添加標籤：
[root@master manifests]# kubectl label pods pod-demo release=canary
pod/pod-demo labeled
[root@master manifests]# kubectl get pods --show-labels
NAME READY STATUS RESTARTS AGE LABELS
client 0/1 Completed 0 121m run=client
myapp-746644f8d6-2msxj 1/1 Running 0 96m pod-template-hash=746644f8d6,run=myapp
myapp-746644f8d6-ch5n2 1/1 Running 0 95m pod-template-hash=746644f8d6,run=myapp
nginx-deploy-7689897d8d-rvp28 1/1 Running 0 136m pod-template-hash=7689897d8d,run=nginx-deploy
pod-demo 2/2 Running 0 2m26s app=myapp,release=canary,tier=frontend
[root@master manifests]#