k8s cookbook读书笔记 第二章

q9989

　　走一遍概念　　

• An overview of Kubernetes control
  
• f Working with pods
  
• f Working with a replication controller
  
• f Working with services
  
• f Working with volumes
  
• f Working with secrets
  
• f Working with names
  
• f Working with namespaces
  
• f Working with labels and selectors
  

• An overview of Kubernetes control
  

　　查看k8s版本
　　% kubectl version
　　是如何做到的
　　kubectl通过restful api 连接kubernetes api server
　　如何工作的
　　kubectl [command] [TYPE] [NAME] [flags]
　　/usr/local/bin/kubectl run my-first-nginx --image=nginx
　　However, you can write either a YAML file or a JSON file to perform similar operations.
　　

# cat nginx.yaml　　
apiVersion: v1
　　
kind: ReplicationController
　　
metadata:
　　
name: my-first-nginx
　　
spec:
　　
replicas: 1
　　
template:
　　
metadata:
　　
labels:
　　
app: nginx
　　
spec:
　　
containers:
　　
- name: my-first-nginx
　　
image: nginx
　　

　　Then specify the  create -f option to execute the  kubectl command as follows
　　

# kubectl create -f nginx.yaml　　
replicationcontroller "my-first-nginx" created
　　

　　status of the replication controller
　　

# kubectl get replicationcontrollers　　
CONTROLLER CONTAINER(S) IMAGE(S) SELECTOR REPLICAS AGE
　　
my-first-nginx my-first-nginx nginx app=nginx 1 12s
　　

　　缩写
　　

kubectl get rc　　
CONTROLLER CONTAINER(S) IMAGE(S) SELECTOR REPLICAS AGE
　　
my
-first-nginx my-first-nginx nginx app=nginx 1 1m　　

　　删除
　　

# kubectl delete rc my-first-nginx　　
replicationcontroller "my-first-nginx" deleted
　　

　　2.pods
　　是k8s中最小的可部署单元
　　每个pod被进程id，网络，进程间通信，时间命名空间隔离。
　　

   docker pull centos　　

　　

# cat my-first-pod.yaml　　
apiVersion: v1
　　
kind: Pod
　　
metadata:
　　
name: my-first-pod
　　
spec:
　　
containers:
　　
- name: my-nginx
　　
image: nginx
　　
- name: my-centos
　　
image: centos
　　
command: ["/bin/sh", "-c", "while : ;do curl http://
　　
localhost:80/; sleep 3; done"]