查看名称空间：
[root@hdss7-21 ~]# kubectl get namespace # 等同于kubectl get ns NAME STATUS AGE default Active 3d22h kube-node-lease Active 3d22h kube-public Active 3d22h kube-system Active 3d22h查看defalut名称空间下的所有资源：
[root@hdss7-21 ~]# kubectl get all -n default # 等同于kubectl get all NAME READY STATUS RESTARTS AGE pod/nginx-ds-pqszs 1/1 Running 0 2d12h pod/nginx-ds-vnlx9 1/1 Running 0 2d12h NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE service/kubernetes ClusterIP 192.168.0.1 <none> 443/TCP 3d23h NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE daemonset.apps/nginx-ds 0 0 0 0 0 <none> 2d12h创建名称空间：
[root@hdss7-21 ~]# kubectl create namespace app namespace/app created [root@hdss7-21 ~]# kubectl get ns NAME STATUS AGE app Active 45s default Active 3d23h kube-node-lease Active 3d23h kube-public Active 3d23h kube-system Active 3d23h删除名称空间：
[root@hdss7-21 ~]# kubectl delete namespace app namespace "app" deleted [root@hdss7-21 ~]# kubectl get ns NAME STATUS AGE default Active 3d23h kube-node-lease Active 3d23h kube-public Active 3d23h kube-system Active 3d23h创建deployment资源：
# 在名称为kube-public的名称空间创建名称为nginx-db资源进行pod控制 [root@hdss7-21 ~]# kubectl create deployment nginx-dp --image=harbor.od.com/public/nginx:v1.7.9 -n kube-public deployment.apps/nginx-db created [root@hdss7-21 ~]# kubectl get deploy -n kube-public NAME READY UP-TO-DATE AVAILABLE AGE nginx-db 0/1 1 0 2m28s [root@hdss7-21 ~]# kubectl get pods -n kube-public NAME READY STATUS RESTARTS AGE nginx-db-7b4dd9978d-8wzdl 0/1 Pending 0 2m52s查看 kube-public名称空间下的Pod
[root@hdss7-21 ~]# kubectl get pods -n kube-public -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES nginx-db-7b4dd9978d-8wzdl 0/1 Pending 0 8m15s <none> <none> <none> <none> # 根据pod名称可以获得对应的容器，一般包含2个容器，分别是基础容器和业务容器查看详细信息：
[root@hdss7-21 ~]# kubectl describe deployment nginx-db -n kube-public Name: nginx-db Namespace: kube-public CreationTimestamp: Wed, 01 Jul 2020 10:58:43 +0800 Labels: app=nginx-db Annotations: deployment.kubernetes.io/revision: 1 Selector: app=nginx-db Replicas: 1 desired | 1 updated | 1 total | 0 available | 1 unavailable StrategyType: RollingUpdate # 发布策略：滚动升级 MinReadySeconds: 0 RollingUpdateStrategy: 25% max unavailable, 25% max surge Pod Template: Labels: app=nginx-db Containers: nginx: Image: harbor.od.com/public/nginx:v1.7.9 Port: <none> Host Port: <none> Environment: <none> Mounts: <none> Volumes: <none> Conditions: Type Status Reason ---- ------ ------ Available False MinimumReplicasUnavailable Progressing False ProgressDeadlineExceeded OldReplicaSets: <none> NewReplicaSet: nginx-db-7b4dd9978d (1/1 replicas created) Events: Type Reason Age From Message ---- ------ ---- ---- ------- Normal ScalingReplicaSet 17m deployment-controller Scaled up replica set nginx-db-7b4dd9978d to 1 # kubectl发出的指令先找apiserver通信确认，apiserver再找scheduler确认,scheduler在最合适的节点通过kubelet来启动容器进入pod资源
[root@hdss7-21 ~]# kubectl get pods -n kube-public NAME READY STATUS RESTARTS AGE pod/nginx-dp-5dfc689474-fc6z9 1/1 Running 0 4s # kubectl exec可以跨主机进入不同的pod [root@hdss7-21 ~]# kubectl exec -it nginx-dp-5dfc689474-fc6z9 /bin/bash root@nginx-ds-pqszs:/# ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever 8: eth0@if9: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1500 qdisc noqueue state UP link/ether 02:42:ac:07:15:02 brd ff:ff:ff:ff:ff:ff inet 172.7.21.3/24 brd 172.7.21.255 scope global eth0 valid_lft forever preferred_lft forever删除pod资源：删除后，pod控制器会立即重启一个新的pod资源，是重启Pod的重要方法
[root@hdss7-21 ~]# kubectl delete pod nginx-db-7b4dd9978d-8wzdl -n kube-public pod "nginx-db-7b4dd9978d-8wzdl" deleted # 强制删除 [root@hdss7-21 ~]# kubectl delete pod nginx-db-7b4dd9978d-8wzdl -n kube-public --force --grace-period=0删除deployment资源
[root@hdss7-21 ~]# kubectl delete deployment nginx-db -n kube-public deployment.extensions "nginx-db" deleted [root@hdss7-21 ~]# kubectl get deployment -n kube-public No resources found. [root@hdss7-21 ~]# kubectl get pods -n kube-public No resources found. [root@hdss7-21 ~]#创建service资源
# 暴露80端口 [root@hdss7-21 ~]# kubectl expose deployment nginx-dp --port=80 -n kube-public service/nginx-dp exposed [root@hdss7-21 ~]# kubectl get all -n kube-public NAME READY STATUS RESTARTS AGE pod/nginx-dp-5dfc689474-4dfsq 1/1 Running 0 44m NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE service/nginx-dp ClusterIP 192.168.103.156 <none> 80/TCP 29m NAME READY UP-TO-DATE AVAILABLE AGE deployment.apps/nginx-dp 2/2 2 2 44m NAME DESIRED CURRENT READY AGE replicaset.apps/nginx-dp-5dfc689474 2 2 2 44m查看端口是否可访问
# 当无法curl时，检查宿主机的内核中是否开启了ipv4转发功能 [root@hdss7-21 ~]# cat /proc/sys/net/ipv4/ip_forward 0 [root@hdss7-21 ~]# echo "1" >!$ echo "1" >/proc/sys/net/ipv4/ip_forward [root@hdss7-21 ~]# cat /proc/sys/net/ipv4/ip_forward 1 [root@hdss7-21 ~]# curl 192.168.103.156 <!DOCTYPE html> <html> <head> <title>Welcome to nginx!</title> <style> body { width: 35em; margin: 0 auto; font-family: Tahoma, Verdana, Arial, sans-serif; } </style> </head> <body> <h1>Welcome to nginx!</h1> <p>If you see this page, the nginx web server is successfully installed and working. Further configuration is required.</p> <p>For online documentation and support please refer to <a href="http://nginx.org/">nginx.org</a>.<br/> Commercial support is available at <a href="http://nginx.com/">nginx.com</a>.</p> <p><em>Thank you for using nginx.</em></p> </body> </html> # 访问成功 # 查看lvs服务信息 [root@hdss7-21 ~]# ipvsadm -Ln IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port Forward Weight ActiveConn InActConn TCP 192.168.0.1:443 nq -> 10.4.7.21:6443 Masq 1 0 0 -> 10.4.7.22:6443 Masq 1 0 0 TCP 192.168.103.156:80 nq -> 172.7.22.2:80 Masq 1 0 0对deployment资源扩容：默认创建时只有一个pod资源
[root@hdss7-21 ~]# kubectl scale deployment nginx-dp --replicas=2 -n kube-public deployment.extensions/nginx-dp scaled # 查看扩容后的信息 [root@hdss7-21 ~]# ipvsadm -Ln IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port Forward Weight ActiveConn InActConn TCP 192.168.0.1:443 nq -> 10.4.7.21:6443 Masq 1 0 0 -> 10.4.7.22:6443 Masq 1 0 0 TCP 192.168.103.156:80 nq -> 172.7.22.2:80 Masq 1 0 0 -> 172.7.22.3:80 Masq 1 0 0查看svc详细信息
[root@hdss7-21 ~]# kubectl describe svc nginx-dp -n kube-public Name: nginx-dp # service资源名称 Namespace: kube-public Labels: app=nginx-dp Annotations: <none> Selector: app=nginx-dp # pod标签名称，将service与pod关联起来 Type: ClusterIP IP: 192.168.103.156 # 该IP网段对集群内部使用 Port: <unset> 80/TCP TargetPort: 80/TCP Endpoints: 172.7.21.2:80,172.7.22.2:80 Session Affinity: None Events: <none>
