了解模板和帮助信息方法
[root@master ~]# kubectl create Tab键 #查找需要使用的相关子命令
[root@master ~]# bubectl 子命令 --help
[root@master ~]# kubectl create 复制查找出来的信息 --dry-run=client -o yaml # 获取资源对象模板
[root@master ~]# kubectl explain Pod.metadata # 查询帮助信息1.配置名称空间
[root@master ~]# vim myweb.yaml
---
kind: Pod
apiVersion: v1
metadata:
name: myweb
namespace: default
spec:
containers:
- name: nginx
image: myos:nginx
status: {}
2.多容器Pod
[root@master ~]# vim mynginx.yaml
---
kind: Pod
apiVersion: v1
metadata:
name: mynginx
namespace: default
spec:
containers:
- name: nginx
image: myos:nginx
- name: php
image: myos:php-fpm
###注意一个Pod容器的共享网络IP,创建的容器的服务不能用相同端口,否测会
###注意多容器的Pod,在用logs,exec,cp等要采用-c去指定哪个容器
# 查看日志
[root@master ~]# kubectl logs mynginx -c nginx
# kubectl exec -it mynginx -c nginx -- pstree -p3.容器保护策略
[root@master ~]# vim mycmd.yaml
[root@master ~]# vim mycmd.yaml
---
kind: Pod
apiVersion: v1
metadata:
name: mycmd
spec:
restartPolicy: OnFailure # 配置重启策略,表示失败后重启,此外还有Always/Never
containers:
- name: linux
image: myos:httpd
command: ["sleep"] # 执行shell命令行命令
args:
- "30"4.宽限期策略
[root@master ~]# vim mycmd.yaml
---
kind: Pod
apiVersion: v1
metadata:
name: mycmd
spec:
terminationGracePeriodSeconds: 0 # 设置宽限期,0表示没有宽限期
restartPolicy: OnFailure
containers:
- name: linux
image: myos:httpd
command: ["sleep"]
args:
- "30"
5.Pod任务脚本
[root@master ~]# vim mycmd.yaml
---
kind: Pod
apiVersion: v1
metadata:
name: mycmd
spec:
terminationGracePeriodSeconds: 0
restartPolicy: OnFailure
containers:
- name: linux
image: myos:8.5
command: ["sh"]
args:
- -c
- |
for i in {0..9};do
echo hello world.
sleep 3.3
done
exit 0
6.最大生命周期
[root@master ~]# vim mycmd.yaml
---
kind: Pod
apiVersion: v1
metadata:
name: mycmd
spec:
terminationGracePeriodSeconds: 0
activeDeadlineSeconds: 60 # 可以执行的最大时长
restartPolicy: OnFailure
containers:
- name: linux
image: myos:8.5
command: ["sh"]
args:
- -c
- |
for i in {0..9};do
echo hello world.
sleep 33
done
exit 0
7.Pod调度策略
[root@master ~]# vim myhttp.yaml
---
kind: Pod
apiVersion: v1
metadata:
name: myhttp
spec:
nodeName: node-0001 # 基于节点名称进行调度
containers:
- name: apache
image: myos:httpd
8.标签管理
# 查看标签
[root@master ~]# kubectl get pods --show-labels
添加标签
[root@master ~]# kubectl label pod myhttp app=apache
pod/myhttp labeled
[root@master ~]# kubectl get pods --show-labels
NAME READY STATUS RESTARTS AGE LABELS
myhttp 1/1 Running 0 14m app=apache
# 删除标签
[root@master ~]# kubectl label pod myhttp app-
pod/myhttp unlabeled
[root@master ~]# kubectl get pods --show-labels
NAME READY STATUS RESTARTS AGE LABELS
myhttp 1/1 Running 0 14m <none>
# 资源清单文件配置标签
[root@master ~]# vim myhttp.yaml
---
kind: Pod
apiVersion: v1
metadata:
name: myhttp
labels:
app: apache
spec:
containers:
- name: apache
image: myos:httpd
# 使用标签过滤资源对象
[root@master ~]# kubectl get pods -l app=apache
9.基于标签调度(k8s做应用分区:给不同node打不同标签,再通过用资源清单文件nodeSelector筛选,创建pod)
# 查询 node 节点上的标签
[root@master ~]# kubectl get nodes --show-labels
NAME STATUS ROLES VERSION LABELS
master Ready control-plane v1.29.2 kubernetes.io/hostname=master
node-0001 Ready <none> v1.29.2 kubernetes.io/hostname=node-0001
node-0002 Ready <none> v1.29.2 kubernetes.io/hostname=node-0002
node-0003 Ready <none> v1.29.2 kubernetes.io/hostname=node-0003
node-0004 Ready <none> v1.29.2 kubernetes.io/hostname=node-0004
node-0005 Ready <none> v1.29.2 kubernetes.io/hostname=node-0005
# 使用 node 上的标签调度 Pod
[root@master ~]# vim myhttp.yaml
---
kind: Pod
apiVersion: v1
metadata:
name: myhttp
labels:
app: apache
spec:
nodeSelector:
kubernetes.io/hostname: node-0002
containers:
- name: apache
image: myos:httpd
[root@master ~]# kubectl replace --force -f myhttp.yaml
pod "myhttp" deleted
pod/myhttp replaced
[root@master ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE
myhttp 1/1 Running 0 1s 10.244.2.11 node-0002
