Kubernetes 学习笔记

# 查看版本
$> minikube version
minikube version: v0.15.0-katacoda

# 启动集群
$> minikube start
Starting local Kubernetes cluster...

# 查看版本
$> kubectl version
Client Version: version.Info{Major:"1", Minor:"5", GitVersion:"v1.5.2", GitCommit:"08e09955
4f3c31f6e6f07b448ab3ed78d0520507", GitTreeState:"clean", BuildDate:"2017-01-12T04:57:25Z",
GoVersion:"go1.7.4", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"5", GitVersion:"v1.5.2", GitCommit:"08e09955
4f3c31f6e6f07b448ab3ed78d0520507", GitTreeState:"clean", BuildDate:"1970-01-01T00:00:00Z",
GoVersion:"go1.7.1", Compiler:"gc", Platform:"linux/amd64"}

# 查看集群状态
$> kubectl cluster-info
Kubernetes master is running at http://host01:8080
heapster is running at http://host01:8080/api/v1/proxy/namespaces/kube-system/services/heap
ster
kubernetes-dashboard is running at http://host01:8080/api/v1/proxy/namespaces/kube-system/s
ervices/kubernetes-dashboard
monitoring-grafana is running at http://host01:8080/api/v1/proxy/namespaces/kube-system/ser
vices/monitoring-grafana
monitoring-influxdb is running at http://host01:8080/api/v1/proxy/namespaces/kube-system/se
rvices/monitoring-influxdb

# 获取可用的 node
$> kubectl get nodes
NAME STATUS AGE
host01 Ready 15m

# 部署应用
$> kubectl run kubernetes-bootcamp --image=docker.io/jocatalin/kubernetes-bootcamp:v1 --port=8080
mp:v1 --port=8080ubernetes-bootcamp --image=docker.io/jocatalin/kubernetes-bootca
deployment "kubernetes-bootcamp" created

# 列出部署
$> kubectl get deployments
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
kubernetes-bootcamp 1 1 1 1 1m

# 查看部署
# 先通过 proxy 连接到正在运行的容器
$> kubectl proxy
Starting to serve on 127.0.0.1:8001

# 然后打开一个新 tab，输出 Pod 名字
$> export POD_NAME=$(kubectl get pods -o go-template --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}')
$> echo Name of the Pod: $POD_NAME
Name of the Pod: kubernetes-bootcamp-390780338-n7q3n

# 获取这个 pod 的输出
$> curl http://localhost:8001/api/v1/proxy/namespaces/default/pods/$POD_NAME/
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-390780338-n7q3n | v=1

# 获取 pod 信息
$> kubectl get pods
NAME READY STATUS RESTARTS AGE
kubernetes-bootcamp-390780338-6b9n3 1/1 Running 0 41m

# 查看 pods 详细信息
# 包括 镜像、IP 等各类信息，describe 不仅可以用于 pods，node 和 deployment 都可以
$> kubectl describe pods
Name: kubernetes-bootcamp-390780338-6b9n3
Namespace: default
Node: host01/172.17.0.41
Start Time: Mon, 05 Jun 2017 03:05:07 +0000
Labels: pod-template-hash=390780338
 run=kubernetes-bootcamp
Status: Running
IP: 172.18.0.2
Controllers: ReplicaSet/kubernetes-bootcamp-390780338
Containers:
 kubernetes-bootcamp:
 Container ID: docker://9308ecb7bb592255b5fb517ec7caa13703f7b5bb41a24145ba1eeb670693a60d
 Image: docker.io/jocatalin/kubernetes-bootcamp:v1
 Image ID: docker-pullable://jocatalin/kubernetes-bootcamp@sha256:0d6b8ee63bb5
7c5f5b6156f446b3bc3b3c143d233037f3a2f00e279c8fcc64af
 Port: 8080/TCP
 State: Running
 Started: Mon, 05 Jun 2017 03:05:08 +0000
 Ready: True
 Restart Count: 0
 Volume Mounts:
 /var/run/secrets/kubernetes.io/serviceaccount from default-token-74qlr (ro)
 Environment Variables: <none>
Conditions:
 Type Status
 Initialized True
 Ready True
 PodScheduled True
Volumes:
 default-token-74qlr:
 Type: Secret (a volume populated by a Secret)
 SecretName: default-token-74qlr
QoS Class: BestEffort
Tolerations: <none>
Events:
 FirstSeen LastSeen Count From SubObjectPath Type Reason Message
 --------- -------- ----- ---- ------------- -------- ------ -------
 41m 41m 1 {default-scheduler } Normal Scheduled Successfully assigned kubernetes-bootcamp-390780338-6b9n3 to host01
 41m 41m 1 {kubelet host01} spec.containers{kubernetes-bootcamp} Normal Pulled Container image "docker.io/jocatalin/kubernetes-bootcamp:v1" already present on machine
 41m 41m 1 {kubelet host01} spec.containers{kubernetes-bootcamp} Normal Created Created container with docker id 9308ecb7bb59; Security:[seccomp=unconfined]
 41m 41m 1 {kubelet host01} spec.containers{kubernetes-bootcamp} Normal Started Started container with docker id 9308ecb7bb
59

# 获取 pod 信息
$> export POD_NAME=$(kubectl get pods -o go-template --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}')
$> echo Name of the Pod: $POD_NAME
Name of the Pod: kubernetes-bootcamp-390780338-6b9n3

# 查看 pod 日志
$> kubectl logs $POD_NAME
Kubernetes Bootcamp App Started At: 2017-06-05T03:05:08.494Z | Running On: kubernetes-bootcamp-390780338-6b9n3

# 查看 pods 信息
$> kubectl get pods
NAME READY STATUS RESTARTS AGE
kubernetes-bootcamp-390780338-76skz 1/1 Running 0 6s

# 查看服务信息
$> kubectl get services
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes 10.0.0.1 <none> 443/TCP 47s

# 暴露服务
$> kubectl expose deployment/kubernetes-bootcamp --type="NodePort" --port 8080
service "kubernetes-bootcamp" exposed