image.png

定義Pod

[root@rourou ~] # vim nginx-busybox.yaml
apiVersion: v1
  kind: Pod
  metadata:  # pod 的源數(shù)據(jù)信息，可以寫(xiě)多個(gè)
    name: nginx-busybox # pod 的名字
spec:
  containers:
  - name: nginx  # 容器的名字
    image: nginx:alpine  # 鏡像的名字
    ports:
    - containerPort: 80
  - name: busybox
    image: busybox
    command: ["/bin/sh"]
    args: ["-c", "while true; do echo hello; sleep 10;done"]

[root@rourou ~] # kubectl create -f nginx-busybox.yaml 

查看pod

kubectl get pods 
NAME                    READY   STATUS    RESTARTS   AGE
nginx-busybox           2/2     Running   0          29m
test-projected-volume   1/1     Running   0          159m

#給查看同樣支持3中格式
kubectl get pods -o wide 
kubectl get pods -o json
kubectl get pods -o yaml 

列出詳細(xì)信息

kubectl get events
LAST SEEN   TYPE     REASON      OBJECT              MESSAGE
<unknown>   Normal   Scheduled   pod/nginx-busybox   Successfully assigned default/nginx-busybox to k8s-node2
6m40s       Normal   Pulled      pod/nginx-busybox   Container image "nginx:alpine" already present on machine

######################################或者##############################
kubectl describe pods nginx-busybox

進(jìn)入指定容器

kubectl exec -it nginx-busybox -c nginx sh 

或者在容器中執(zhí)行命令并將及如果返回終端
kubectl exec nginx-busybox -c nginx   ls /

#-c   指定容器

多個(gè)pods實(shí)例

指定節(jié)點(diǎn)創(chuàng)建pod

apiVersion: v1
kind: Pod
metadata:  # pod 的源數(shù)據(jù)信息，可以寫(xiě)多個(gè)
  name: nginx-busybox # pod 的名字
spec:
  nodeSelector:
    disktype: ssd
  containers:
  - name: nginx  # 容器的名字
    image: nginx:alpine  # 鏡像的名字
    ports:
    - containerPort: 80
  - name: busybox
    image: busybox
    command: ["/bin/sh"]
    args: ["-c", "while true; do echo hello; sleep 10;done"]

修改pod的容器的hosts文件

apiVersion: v1
kind: Pod
metadata:  # pod 的源數(shù)據(jù)信息，可以寫(xiě)多個(gè)
  name: nginx-hosts # pod 的名字
spec:
  hostAliases:
  - ip: "10.0.122.126"
    hostnames:
    - "rourou1.remote"
    - "rourou2.remote"
  containers:
  - name: nginx  # 容器的名字
    image: nginx:alpine  # 鏡像的名字
    ports:
    - containerPort: 80
  - name: busybox
    image: busybox
    command: ["/bin/sh"]
    args: ["-c", "while true; do echo hello; sleep 10;done"]

#本實(shí)驗(yàn)的client與server的版本皆為v1.16.0，得到的/etc/hosts的結(jié)果
10.0.122.126        rourou1.remote     rourou2.remote

指定namespace創(chuàng)建pod

apiVersion: v1
kind: Pod
metadata:
  name: nginx-namespace
  namespace: demo
spec:
  containers:
  - name: nginx
    image: nginx
    ports:
    - containerPort: 8

#指定namespace為demo
kubectl get pods --namespace demo  即可查看指定namespace下的pods
若是使用kubectl get pods則為默認(rèn)的namespace，不會(huì)顯示demo下的pods

創(chuàng)建的容器之間共享進(jìn)程、

apiVersion: v1
kind: Pod
metadata:  # pod 的源數(shù)據(jù)信息，可以寫(xiě)多個(gè)
  name: nginx-share # pod 的名字
spec:
  shareProcessNamespace: true
  containers:
  - name: nginx  # 容器的名字
    image: nginx:alpine  # 鏡像的名字
    ports:
    - containerPort: 80
  - name: busybox
    image: busybox
    stdin: true
    tty: true
#在busybox中可以查看到nginx的進(jìn)程

創(chuàng)建的容器共享宿主機(jī)的進(jìn)程等

apiVersion: v1
kind: Pod
metadata:  # pod 的源數(shù)據(jù)信息，可以寫(xiě)多個(gè)
  name: nginx-share-host # pod 的名字
spec:
  hostNetwork: true
  hostIPC: true
  hostPID: true
  containers:
  - name: nginx  # 容器的名字
    image: nginx:alpine  # 鏡像的名字
    ports:
    - containerPort: 8080
  - name: busybox
    image: busybox
    stdin: true
    tty: true
#注意：與主機(jī)共享進(jìn)程時(shí)不能指定80端口，否則創(chuàng)建容器時(shí)一直處于panding狀態(tài)