kubectl get pods
kubectl get pods -o wide
kubectl get deployments
#加副本
kubectl scale deploy nginx-deployment --replicas=3
#镜像更新失败回滚之前操作
kubectl rollout undo deploy nginx-deployment
[root@k8s-master-lzy k8s_test]# kubectl get pods -l app=nginx
NAME READY STATUS RESTARTS AGE
nginx-deployment-569477d6d8-6xc85 1/1 Running 0 11m
nginx-deployment-569477d6d8-78pln 1/1 Running 0 11m
[root@k8s-master-lzy ~]# kubectl get services
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 8d
[root@k8s-master-lzy ~]# kubectl describe service kubernetes
Name: kubernetes
Namespace: default
Labels: component=apiserver
provider=kubernetes
Annotations: <none>
Selector: <none>
Type: ClusterIP
IP: 10.96.0.1
Port: https 443/TCP
TargetPort: 6443/TCP
Endpoints: 172.16.31.151:6443
Session Affinity: ClientIP
Events: <none>
#yml启动
kubectl create -f nginx-deployment2.yaml
#YML
3.kube-proxy kube-dns
#proxy将容器中的服务通过proxy对外映射除去
#找到相应deploy
[root@k8s-master-lzy k8s_test]# kubectl get deploy
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
curl 1 1 1 1 8d
nginx-deployment 2 2 2 2 8d
#暴露deploy
[root@k8s-master-lzy k8s_test]# kubectl expose deploy nginx-deployment --type="NodePort" --target-port=80 --port=80
service "nginx-deployment" exposed
[root@k8s-master-lzy k8s_test]# kubectl get services
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 8d
nginx-deployment NodePort 10.99.252.93 <none> 80:32162/TCP 10s
[root@k8s-master-lzy k8s_test]# netstat -luntp | grep 32162
tcp6 0 0 :::32162 :::* LISTEN 12109/kube-proxy
[root@k8s-master-lzy k8s_test]#
[图片上传中...(image.png-263681-1543571709033-0)]
4：proxy：每台工作节点上都应该运行一个kube-proxy服务，它监听API server中service和endpoint的变化情况，并通过iptables等来为服务配置负载均衡，是让我们的服务在集群外可以被访问到的重要方式
如何创建service：
vim nginx-service.yaml
apiVersion: v1
kind: Service
metadata:
name: nginx-service
spec:
port:
- port: 80
targetPort: 80
nodePort: 20000
selector:
app: nginx
type: NodePort
@ok
[root@k8s-master-lzy k8s_test]# kubectl create -f nginx-service.yaml
service "nginx-service" created
图中service已经启动并构建
5.kube-dns：kube-dns为Kubernetes集群提供命名服务，主要用来解析集群服务名和Pod的hostname。目的是让pod可以通过名字访问到集群内服务。它通过添加A记录的方式实现名字和service的解析。普通的service会解析到service-ip。headless service会解析到pod列表。
如何通过dns 访问服务：
如何查看系统svc是否启动：
[root@k8s-master-lzy k8s_test]# kubectl -n kube-system get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kube-dns ClusterIP 10.96.0.10 <none> 53/UDP,53/TCP 8d
kubernetes-dashboard NodePort 10.101.151.51 <none> 443:30000/TCP 8d
5.练习：
如何查看pods 日志：
[root@k8s-master-lzy ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
curl-6896d87888-7vltw 1/1 Running 1 8d
nginx-deployment-569477d6d8-6xc85 1/1 Running 0 2h
nginx-deployment-569477d6d8-78pln 1/1 Running 0 2h
[root@k8s-master-lzy ~]# kubectl logs nginx-deployment-569477d6d8-78pln -f
如何进入pod内部：
[root@k8s-master-lzy ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
curl-6896d87888-7vltw 1/1 Running 1 8d
nginx-deployment-569477d6d8-6xc85 1/1 Running 0 2h
nginx-deployment-569477d6d8-78pln 1/1 Running 0 2h
[root@k8s-master-lzy ~]# kubectl exec -it nginx-deployment-569477d6d8-6xc85 bash
root@nginx-deployment-569477d6d8-6xc85:/# ls
bin boot dev etc home lib lib64 media mnt opt proc root run sbin selinux srv sys tmp usr var
查看sa 并以yaml格式输出：
[root@k8s-master-lzy ~]# kubectl get sa -o yaml
apiVersion: v1
items:
- apiVersion: v1
kind: ServiceAccount
metadata:
creationTimestamp: 2018-11-21T11:32:00Z
name: default
namespace: default
resourceVersion: "293"
selfLink: /api/v1/namespaces/default/serviceaccounts/default
uid: 0fdad53b-ed81-11e8-8f47-00163e0227ca
secrets:
- name: default-token-26l9m
kind: List
metadata:
resourceVersion: ""
selfLink: ""
更新yaml 文件
[root@k8s-master-lzy k8s_test]# kubectl apply -f nginx-deployment2.yaml
deployment "nginx-deployment" configured
#测试用的 沙盒pod
kubectl run busybox --rm=true --image=busybox --restart=Never --tty -i
6.容器编排微服务。
