Kubernetes支持YAML和JSON格式创建资源对象
Kubernetes支持YAML和JSON格式创建资源对象JSON格式用于接口之间消息的传递YAML格式用于配置和管理YAML是一种简洁的非标记性语言语法格式:缩进标识层级关系不支持制表符缩进,使用空格缩进通常开头缩进两个空格字符后缩进一个空格,如冒号,逗号,短横杆等“—”表示YAML格式,一个文件的开始“#”表示注释[root@master1 ~]# kubectl api-versionsad
Kubernetes支持YAML和JSON格式创建资源对象
JSON格式用于接口之间消息的传递
YAML格式用于配置和管理
YAML是一种简洁的非标记性语言
语法格式:
缩进标识层级关系
不支持制表符缩进,使用空格缩进
通常开头缩进两个空格
字符后缩进一个空格,如冒号,逗号,短横杆等
“—”表示YAML格式,一个文件的开始
“#”表示注释
[root@master1 ~]# kubectl api-versions
admissionregistration.k8s.io/v1beta1
apiextensions.k8s.io/v1beta1
apiregistration.k8s.io/v1
apiregistration.k8s.io/v1beta1
apps/v1
apps/v1beta1
apps/v1beta2
authentication.k8s.io/v1
authentication.k8s.io/v1beta1
authorization.k8s.io/v1
authorization.k8s.io/v1beta1
autoscaling/v1
autoscaling/v2beta1
autoscaling/v2beta2
batch/v1
batch/v1beta1
certificates.k8s.io/v1beta1
coordination.k8s.io/v1beta1
events.k8s.io/v1beta1
extensions/v1beta1
networking.k8s.io/v1
policy/v1beta1
rbac.authorization.k8s.io/v1
rbac.authorization.k8s.io/v1beta1
scheduling.k8s.io/v1beta1
storage.k8s.io/v1
storage.k8s.io/v1beta1
v1
[root@master1 ~]# mkdir demo
[root@master1 ~]# cd demo/
[root@master1 demo]# vim nginx-deployment.yaml
apiVersion: apps/v1 #apiVersion是当前配置格式的版本
kind: Deployment #kind是要创建的资源类型,这里是Deploymnet
metadata:
name: nginx-deployment
labels:
app: nginx
spec: #spec部分是该Deployment的规则说明
replicas: 3 #relicas指定副本数量,默认为1
selector:
matchLabels:
app: nginx
template: #template定义Pod的模板,这是配置的重要部分
metadata: #metadata定义Pod的元数据,至少要顶一个label,label的key和value可以任意指定
labels:
app: nginx
spec: #spec描述的是Pod的规则,此部分定义pod中每一个容器的属性,name和image是必需的
containers:
- name: nginx
image: nginx:1.15.4
ports:
- containerPort: 80
[root@master1 demo]# kubectl create --help
[root@master1 demo]# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-deployment-d55b94fd-gc2xv 1/1 Running 0 11m
nginx-deployment-d55b94fd-wt5g7 1/1 Running 0 11m
nginx-deployment-d55b94fd-xwxsr 1/1 Running 0 11m
[root@master1 demo]# vim nginx-service.yaml
apiVersion: v1
kind: Service
metadata:
name: nginx-service
labels:
app: nginx
spec:
type: NodePort
ports:
- port: 80
targetPort: 80
selector:
app: nginx
[root@master1 demo]# kubectl create -f nginx-service.yaml
详解k8s中的port
*port*
port是k8s集群内部访问service的端口,即通过clusterIP: port可以访问到某个service
*nodePort*
nodePort是外部访问k8s集群中service的端口,通过nodeIP: nodePort可以从外部访问到某个service。
*targetPort*
targetPort是pod的端口,从port和nodePort来的流量经过kube-proxy流入到后端pod的targetPort上,最后进入容器。
*containerPort*
containerPort是pod内部容器的端口,targetPort映射到containerPort。
自动测试命令的正确性,并不执行创建
[root@master1 demo]# kubectl run nginx-deployment --image=nginx --port=80 --replicas=3 --dry-run
kubectl run --generator=deployment/apps.v1beta1 is DEPRECATED and will be removed in a future version. Use kubectl create instead.
deployment.apps/nginx-deployment created (dry run)
查看生成yaml格式
[root@master1 demo]# kubectl run nginx-deployment --image=nginx --port=80 --replicas=3 --dry-run -o yaml
kubectl run --generator=deployment/apps.v1beta1 is DEPRECATED and will be removed in a future version. Use kubectl create instead.
apiVersion: apps/v1beta1
kind: Deployment
metadata:
creationTimestamp: null
labels:
run: nginx-deployment
name: nginx-deployment
spec:
replicas: 3
selector:
matchLabels:
run: nginx-deployment
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
run: nginx-deployment
spec:
containers:
- image: nginx
name: nginx-deployment
ports:
- containerPort: 80
resources: {}
status: {}
查看生成json格式
[root@master1 demo]# kubectl run nginx-deployment --image=nginx --port=80 --replicas=3 --dry-run -o json
kubectl run --generator=deployment/apps.v1beta1 is DEPRECATED and will be removed in a future version. Use kubectl create instead.
{
"kind": "Deployment",
"apiVersion": "apps/v1beta1",
"metadata": {
"name": "nginx-deployment",
"creationTimestamp": null,
"labels": {
"run": "nginx-deployment"
}
},
"spec": {
"replicas": 3,
"selector": {
"matchLabels": {
"run": "nginx-deployment"
}
},
"template": {
"metadata": {
"creationTimestamp": null,
"labels": {
"run": "nginx-deployment"
}
},
"spec": {
"containers": [
{
"name": "nginx-deployment",
"image": "nginx",
"ports": [
{
"containerPort": 80
}
],
"resources": {}
}
]
}
},
"strategy": {}
},
"status": {}
}
[root@master1 demo]# kubectl run nginx-deployment --image=nginx --port=80 --replicas=3 --dry-run -o yaml > my-deployment.yaml
[root@master1 demo]# ls
my-deployment.yaml nginx-service.yaml
nginx-deployment.yaml
将现有的资源生成模板导出
[root@master1 demo]# kubectl get deployment/nginx-deployment --export -o yaml
#注意名字要写全了deployment/nginx-deployment
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
annotations:
deployment.kubernetes.io/revision: "1"
creationTimestamp: null
generation: 1
labels:
app: nginx
name: nginx-deployment
selfLink: /apis/extensions/v1beta1/namespaces/default/deployments/nginx-deployment
spec:
progressDeadlineSeconds: 600
replicas: 3
revisionHistoryLimit: 10
selector:
matchLabels:
app: nginx
strategy:
rollingUpdate:
maxSurge: 25%
maxUnavailable: 25%
type: RollingUpdate
template:
metadata:
creationTimestamp: null
labels:
app: nginx
spec:
containers:
- image: nginx:1.15.4
imagePullPolicy: IfNotPresent
name: nginx
ports:
- containerPort: 80
protocol: TCP
resources: {}
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
dnsPolicy: ClusterFirst
restartPolicy: Always
schedulerName: default-scheduler
securityContext: {}
terminationGracePeriodSeconds: 30
status: {}
保存到文件中
[root@master1 demo]# kubectl get deployment/nginx-deployment --export -o yaml > /opt/my-deploy.yaml
[root@master1 demo]# cd /opt/
[root@master1 opt]# ls
etcd kubernetes my-deploy.yaml rh
查看字段帮助信息
[root@master1 opt]# kubectl explain pods.spec.containers
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