1，陳述式對象配置：
編寫develop-ns.yaml，在此之前可以查看kubectl get ns
root@node01 ~]# kubectl get ns
NAME STATUS AGE
default Active 23h
kube-node-lease Active 23h
kube-public Active 23h
kube-system Active 23h
[root@node01 ~]# kubectl get ns defaule -o yaml
Error from server (NotFound): namespaces "defaule" not found
[root@node01 ~]# kubectl get ns default -o yaml
apiVersion: v1
kind: Namespace
metadata:
creationTimestamp: "2019-09-18T03:16:48Z"
name: default
resourceVersion: "150"
selfLink: /api/v1/namespaces/default
uid: 2e9fc72c-69ae-4a4c-98e4-2c94ae8a1e47
spec:
finalizers:
- kubernetes
status:
phase: Active
tip：kubectl get ns defaule -o yaml中有5個字段：apiVersion、kind、metadata、spec、status
編寫develop-ns.yaml
[root@master basics]# cat develop-ns.yaml
apiVersion: v1
kind: Namespace
metadata:
name: develop
創建：
[root@master basics]# kubectl create -f develop-ns.yaml
[root@master basics]# kubectl get ns
NAME STATUS AGE
default Active 24h
develop Active 14m
2，聲明式對象配置
編寫prod-ns.yaml
[root@master basics]# cat prod-ns.yaml
apiVersion: v1
kind: Namespace
metadata:
name: prod
創建：
[root@master basics]# kubectl apply -f prod-ns.yaml
[root@master basics]# kubectl get ns
NAME STATUS AGE
default Active 24h
develop Active 17m
kube-node-lease Active 24h
kube-public Active 24h
kube-system Active 24h
prod Active 15m
注：create和apply區別即陳述式和聲明式區別：create只能創建一次，apply可以修改配置文件繼續創建。
3，編寫pod
模板：
[root@master basics]# kubectl get pods jh-fb6f55f99-qbgrq -o yaml --export
Flag --export has been deprecated, This flag is deprecated and will be removed in future.
apiVersion: v1
kind: Pod
metadata:
creationTimestamp: null
generateName: jh-fb6f55f99-
labels:
app: jh
pod-template-hash: fb6f55f99
ownerReferences:
- apiVersion: apps/v1
blockOwnerDeletion: true
controller: true
kind: ReplicaSet
name: jh-fb6f55f99
uid: 559ddefd-ce84-432c-84e9-04c0c0a60249
selfLink: /api/v1/namespaces/default/pods/jh-fb6f55f99-qbgrq
spec:
containers:
- image: nginx:1.14-alpine
imagePullPolicy: IfNotPresent
name: nginx
resources: {}
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
volumeMounts:
- mountPath: /var/run/secrets/kubernetes.io/serviceaccount
name: default-token-swrt5
readOnly: true
dnsPolicy: ClusterFirst
enableServiceLinks: true
nodeName: node02
priority: 0
restartPolicy: Always
schedulerName: default-scheduler
securityContext: {}
serviceAccount: default
serviceAccountName: default
terminationGracePeriodSeconds: 30
tolerations:
- effect: NoExecute
key: node.kubernetes.io/not-ready
operator: Exists
tolerationSeconds: 300
- effect: NoExecute
key: node.kubernetes.io/unreachable
operator: Exists
tolerationSeconds: 300
volumes:
- name: default-token-swrt5
secret:
defaultMode: 420
secretName: default-token-swrt5
status:
phase: Pending
qosClass: BestEffort
[root@master basics]#
編寫pod1：
[root@master basics]# cat pod-demo.yaml
apiVersion: v1
kind: Pod
metadata:
creationTimestamp: null
name: pod-demo
namespace: develop
spec:
containers:
- image: nginx:1.14-alpine
imagePullPolicy: IfNotPresent
name: nginx
resources: {}
dnsPolicy: ClusterFirst
enableServiceLinks: true
priority: 0
restartPolicy: Always
schedulerName: default-scheduler
securityContext: {}
[root@master basics]#
啓動：
[root@master basics]# kubectl apply -f pod-demo.yaml
pod/pod-demo created
[root@master basics]# kubectl get pods -n develop
NAME READY STATUS RESTARTS AGE
pod-demo 1/1 Running 0 45s
編寫pod2
[root@master basics]# vi pod-demo-2.yaml
apiVersion: v1
kind: Pod
metadata:
name: pod-demo
namespace: prod
spec:
containers:
- name: myapp
image: ikubernetes/myapp:v1
- name: bbox
image: busybox:latest
imagePullPolicy: IfNotPresent
command: ["/bin/sh","-c","sleep 86400"]
查看：
[root@master basics]# kubectl apply -f pod-demo-2.yaml
pod/pod-demo created
[root@master basics]# kubectl get pods -n prod
NAME READY STATUS RESTARTS AGE
pod-demo 0/2 ContainerCreating 0 30s
在此你的namespace是什麼就-n…
3，容器與宿主機交互
與bbox容器交互：
[root@master basics]# kubectl get pods -n prod
NAME READY STATUS RESTARTS AGE
pod-demo 2/2 Running 0 6m41s
[root@master basics]# kubectl exec pod-demo -c bbox -n prod -it -- /bin/sh
/ # ifconfig
eth0 Link encap:Ethernet HWaddr 62:AC:18:73:CA:22
inet addr:10.244.3.4 Bcast:0.0.0.0 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1450 Metric:1
RX packets:9 errors:0 dropped:0 overruns:0 frame:0
TX packets:1 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:698 (698.0 B) TX bytes:42 (42.0 B)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
/ #
查看容器日誌：
[root@master basics]# kubectl logs pod-demo -n prod -c myapp
與宿主機交互
編寫pod：
[root@master basics]# vi host-pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: mypod
namespace: default
spec:
containers:
- name: mynginx
image: nginx:1.14-alpine
ports:
- protocol: TCP
containerPort: 80
name: http
hostPort: 8080
apply pod：
[root@master basics]# kubectl apply -f host-pod.yaml
pod/mypod created
[root@master basics]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
jh-fb6f55f99-qbgrq 1/1 Running 0 4h53m 10.244.2.3 node02 <none> <none>
mypod 1/1 Running 0 12s 10.244.2.5 node02 <none> <none>
ngx-dep-5b87ccccb8-cct95 1/1 Running 0 6h7m 10.244.1.4 node01 <none> <none>
ngx-dep1-69b57c7d65-7rd49 1/1 Running 0 5h11m 10.244.3.3 node03 <none> <none>
ngx-dep1-69b57c7d65-mqbc9 1/1 Running 0 6h37m 10.244.1.3 node01 <none> <none>
[root@master basics]#
在此可見mypod運行在node02節點上，所以在瀏覽器訪問node02ip：8080.
4，pod標籤
編寫pod：
[root@master basics]# vi pod-demo-2.yaml
apiVersion: v1
kind: Pod
metadata:
name: pod-demo
namespace: prod
labels:
app: pod-demo
rel: stable
spec:
containers:
- name: myapp
image: ikubernetes/myapp:v1
- name: bbox
image: busybox:latest
imagePullPolicy: IfNotPresent
command: ["/bin/sh","-c","sleep 86400"]
[root@master basics]# kubectl get pods -n prod --show-labels
NAME READY STATUS RESTARTS AGE LABELS
pod-demo 2/2 Running 0 87m app=pod-demo,rel=stable
修改標籤：
[root@master basics]# kubectl label pods pod-demo -n prod tier=frontend
pod/pod-demo labeled
[root@master basics]# kubectl get pods -n prod --show-labels
NAME READY STATUS RESTARTS AGE LABELS
pod-demo 2/2 Running 0 90m app=pod-demo,rel=stable,tier=frontend
覆蓋標籤：
[root@master basics]# kubectl label pods pod-demo -n prod --overwrite=true app=myapp
pod/pod-demo labeled
[root@master basics]# kubectl get pods -n prod --show-labels
NAME READY STATUS RESTARTS AGE LABELS
pod-demo 2/2 Running 0 92m app=myapp,rel=stable,tier=frontend
[root@master basics]#
刪除標籤：
[root@master basics]# kubectl label pods pod-demo -n prod rel-
pod/pod-demo labeled
[root@master basics]# kubectl get pods -n prod --show-labels
NAME READY STATUS RESTARTS AGE LABELS
pod-demo 2/2 Running 0 94m app=myapp,tier=frontend
[root@master basics]#
標籤選擇：
[root@master basics]# kubectl get pods --show-labels -l app=ngx-dep1
NAME READY STATUS RESTARTS AGE LABELS
ngx-dep1-69b57c7d65-7rd49 1/1 Running 0 6h25m app=ngx-dep1,pod-template-hash=69b57c7d65
ngx-dep1-69b57c7d65-mqbc9 1/1 Running 0 7h51m app=ngx-dep1,pod-template-hash=69b57c7d65
