k8s对资源对象的操作
node
## 增加node节点
kubeadm join 10.0.0.200:6443 --token q5uhqh.dcv21idbtej2jopc \
--discovery-token-ca-cert-hash sha256:68f830114530ab7a43d1b732eb646e0cc38df2b88f18e978d12cec01efe59db1
#--- 忘记token
[root@master ~]# kubeadm token create --print-join-command
W0918 14:32:06.998831 77062 configset.go:348] WARNING: kubeadm cannot validate component configs for API groups [kubelet.config.k8s.io kubeproxy.config.k8s.io]
kubeadm join 10.0.0.200:6443 --token ry4gwx.uou199gw6lokdl5u \
--discovery-token-ca-cert-hash sha256:180b11aa0a8bf2a278573979cc95af56bb2a57205f8472ae6bdebbe9ab77904a
## 删除node节点
kubectl delete node [主机名]
## 查询node节点
kubectl get node # 查看全部node
kubectl get nodes # 查看全部node
kebectl get node node01 # 查看指定 node
kebectl get node node01 -o wide # 查看指定node的详细信息
## 查看node的描述
kubectl describe pod nginx-565785f75c-drgsh
kubectl describe pod -n lll centos-nginx-pod
namespace（ns）
### 增加ns
[root@master ~]# kubectl create ns lzd
namespace/lzd created
### 删除ns
[root@master ~]# kubectl delete ns lzd
namespace "lzd" deleted
### 查ns
[root@master ~]# kubectl get ns
NAME STATUS AGE
default Active 5d2h
kube-flannel Active 5d2h
kube-node-lease Active 5d2h
kube-public Active 5d2h
kube-system Active 5d2h
lll Active 4h7m
## 查看指定 ns的描述
[root@master ~]# kubectl describe ns lll
Name: lll
Labels: <none>
Annotations: <none>
Status: Active
No resource quota.
No LimitRange resource
pod
### 创建一个pod
# 编写一个yaml的文件
[root@master ~]# cat nginx.yaml
apiVersion: "v1"
kind: "Namespace"
metadata:
name: lll
---
apiVersion: v1
kind: Pod
metadata:
name: centos-nginx-pod
namespace: lll
spec:
containers:
- image: nginx:alpine
imagePullPolicy: IfNotPresent
name: nginx-containers-lll
- image: centos:7
imagePullPolicy: IfNotPresent
name: centos7-containers-lll
command:
- /bin/tail
- -f
- /etc/hosts
# 运行 apply（应用-不报错） caeate（创建-会报错）
[root@master ~]# kubectl apply -f nginx.yaml
namespace/lll unchanged
pod/centos-nginx-pod unchanged
[root@master ~]# kubectl create -f nginx.yaml
Error from server (AlreadyExists): error when creating "nginx.yaml": namespaces "lll" already exists
Error from server (AlreadyExists): error when creating "nginx.yaml": pods "centos-nginx-pod" already exists
-o|--output：指定输出格式
json：输出json格式
yaml：输出yaml格式
wide：输出详细信息
-n：指定名称空间
### 查看pod （默认是在default名称空间中）
[root@master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
nginx-565785f75c-4sll4 1/1 Running 0 5h55m
### 查看指定名称空间的 pod （-n 指定名称空间）
kubectl get pod -n lll
NAME READY STATUS RESTARTS AGE
centos-nginx-pod 2/2 Running 0 4h10m
### 查看指定pod的 yaml文件
[root@master ~]# kubectl get pod nginx-565785f75c-drgsh -n lll -o yaml
### 查看pod的详细信息
[root@master ~]# kubectl get pod -n lll centos-nginx-pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
centos-nginx-pod 2/2 Running 0 4h12m 10.2.3.6 node03 <none> <none>
### 删除pod
[root@master ~]# kubectl delete pod nginx-565785f75c-4sll4
pod "nginx-565785f75c-4sll4" deleted
### 利用yaml文件删除 （清楚yaml文件中的所有）
[root@master ~]# kubectl delete -f nginx.yaml
namespace "lll" deleted
pod "centos-nginx-pod" deleted
排错
## 查看pod（容器的）的日志
[root@master ~]# kubectl logs nginx-565785f75c-drgsh
root@master ~]# kubectl logs -n lll centos-nginx-pod nginx-containers-lll
ns pod pod中的容器
## 查看创建pod过程的故障
kubectl describe [资源] [资源名] [-n 名称空间]
[root@master ~]# kubectl describe pod -n lll centos-nginx-pod
pod ns pod
标签的操作
## 标签都是以key=value的形势存在 并且只能存在一个key
## 查看
kubectl get [资源] [子资源] -n [名称空间] --show-labels
## 增加
kubectl label [资源] [子资源] -n [名称空间] [标签]+
kubectl label [资源] [子资源] -n [名称空间] node-role.kubernetes.io/[标签]+
## 删除
kubectl label [资源] [子资源] -n [名称空间] [标签]-
kubectl label [资源] [子资源] -n [名称空间] node-role.kubernetes.io/[标签]-
## 根据标签删除POD
[root@master01 kubernetes]# kubectl delete pod -l run=nginx
## 连接到POD
[root@master01 kubernetes]# kubectl exec -it nginx-pod -- /bin/sh
## 当一个POD中有多个容器时，使用-c指定容器名，连接到指定的容器
[root@master01 kubernetes]# kubectl exec -it nginx-busybox -c busybox-container -- /bin/sh
node
node的标签
1.### 查看 node标签 （以逗号为分隔符号）
[root@master ~]# kubectl get node --show-labels
NAME STATUS ROLES AGE VERSION LABELS
master Ready master 6d1h v1.19.3 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,
node01 Ready node 6d1h v1.19.3 beta.kubernetes.io/arch=amd64,
node02 Ready node 6d1h v1.19.3 beta.kubernetes.io/arch=amd64,
node03 Ready node 6d1h v1.19.3 beta.kubernetes.io/arch=amd64,
2.### 添加 node标签
[root@master ~]# kubectl label node node01 web=nginx
node/node01 labeled
[root@master ~]# kubectl get node node01 --show-labels
NAME STATUS ROLES AGE VERSION LABELS
node01 Ready node 6d1h v1.19.3 web=nginx
3.#### 删除node 标签
[root@master ~]# kubectl label node node01 web-
node/node01 labeled
[root@master ~]# kubectl get node node01 --show-labels
NAME STATUS ROLES AGE VERSION LABELS
node01 Ready node 6d1h v1.19.3
node的role
1.### 查看node的role
[root@master ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
master Ready master 6d1h v1.19.3
node01 Ready node 6d1h v1.19.3
node02 Ready node 6d1h v1.19.3
node03 Ready node 6d1h v1.19.3
2.### 添加node的role
[root@master ~]# kubectl label node node01 node-role.kubernetes.io/001=
node/node01 labeled
[root@master ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
master Ready master 6d1h v1.19.3
node01 Ready 001,node 6d1h v1.19.3
node02 Ready node 6d1h v1.19.3
node03 Ready node 6d1h v1.19.3
3.## 删除node的role
[root@master ~]# kubectl label node node01 node-role.kubernetes.io/001-
node/node01 labeled
[root@master ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
master Ready master 6d1h v1.19.3
node01 Ready node 6d1h v1.19.3
node02 Ready node 6d1h v1.19.3
node03 Ready node 6d1h v1.19.3
pod
1.### 查看pod的标签
[root@master ~]# kubectl get pod --show-labels
NAME READY STATUS RESTARTS AGE LABELS
nginx-565785f75c-drgsh 1/1 Running 0 23h app=nginx,pod-template-hash=565785f75c
2.### 增加pod的标签
[root@master ~]# kubectl label pod nginx-565785f75c-drgsh appp=web
pod/nginx-565785f75c-drgsh labeled
[root@master ~]# kubectl get pod --show-labels
NAME READY STATUS RESTARTS AGE LABELS
nginx-565785f75c-drgsh 1/1 Running 0 23h app=nginx,appp=web,pod-template-hash=565785f75c
3.### 删除pod的标签
[root@master ~]# kubectl label pod nginx-565785f75c-drgsh app-
pod/nginx-565785f75c-drgsh labeled
[root@master ~]# kubectl get pod --show-labels
NAME READY STATUS RESTARTS AGE LABELS
nginx-565785f75c-drgsh 1/1 Running 0 23h pod-template-hash=565785f75c