Kubernetes基础：CLI与Restful API：pod管理
使用CLI方式可以通过kubectl对Kubernetes进行操作，同时也使用Restful API直接进行操作。这篇文章介绍一下两种方式下进行pod的管理的方法。
环境准备
快速环境搭建建议使用单机版Kubernetes的安装脚本，一键安装，详情可参看：
- Kubernetes单机版快速安装（Ansible脚本版）
事前准备
使用docker pull命令下载nginx:latest镜像用于试验。
[root@host132 ~]# docker pull nginx:latest
latest: Pulling from library/nginx
1ab2bdfe9778: Pull complete
a17e64cfe253: Pull complete
e1288088c7a8: Pull complete
Digest: sha256:53ddb41e46de3d63376579acf46f9a41a8d7de33645db47a486de9769201fec9
Status: Downloaded newer image for nginx:latest
[root@host132 ~]#
kubectl 方式
创建新的pod
- 创建pod所用的yaml文件
[root@host132 yaml]# cat pod-demo1.yaml
---
apiVersion: v1
kind: Pod
metadata:
name: nginx
spec:
containers:
- name: nginx-container
image: nginx:latest
ports:
- containerPort: 80
...
[root@host132 yaml]#
使用kubectl可以直接使用如下命令创建新的pod（名为nginx的pod）
kubectl命令：kubectl create -f pod-demo1.yaml
执行示例信息
[root@host132 yaml]# kubectl get pods
No resources found.
[root@host132 yaml]# kubectl create -f pod-demo1.yaml
pod/nginx created
[root@host132 yaml]# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx 1/1 Running 0 4s
[root@host132 yaml]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx 1/1 Running 0 10s 10.254.224.4 192.168.163.132
[root@host132 yaml]#
获取所有pod列表信息
使用kubectl可以直接使用如下命令获取pod列表信息
kubectl命令：kubectl get pods -o wide
执行示例信息
[root@host132 ~]# kubectl get pods -o wide
No resources found.
[root@host132 ~]#
获取指定pod信息
使用kubectl可以直接使用如下命令获取指定pod信息（名为nginx的pod）
kubectl命令：kubectl get pods nginx -o wide
执行示例信息
[root@host132 yaml]# kubectl get pods nginx -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx 1/1 Running 0 3m26s 10.254.224.4 192.168.163.132
[root@host132 yaml]#
删除指定的pod
使用kubectl可以直接使用如下命令删除指定的pod（名为nginx的pod）
kubectl命令：kubectl delete pods nginx
执行示例信息
[root@host132 yaml]# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx 1/1 Running 0 7m36s
[root@host132 yaml]# kubectl delete pods nginx
pod "nginx" deleted
[root@host132 yaml]#
[root@host132 yaml]# kubectl get pods
No resources found.
[root@host132 yaml]#
从运行中的pod中获得yaml或者json的配置信息
使用kubectl可以直接使用如下命令获得运行中的pod的yaml或者json的配置详细信息>kubectl命令（获取yaml信息）：kubectl get pods nginx -o yaml
kubectl命令（获取json信息）：kubectl get pods nginx -o json
[root@host132 yaml]# kubectl get pods nginx -o yaml
apiVersion: v1
kind: Pod
metadata:
creationTimestamp: "2019-08-31T03:38:02Z"
name: nginx
namespace: default
resourceVersion: "37952"
selfLink: /api/v1/namespaces/default/pods/nginx
uid: 00e4d249-bf75-4506-a2dc-a3f51d0bd795
spec:
containers:
- image: nginx:latest
imagePullPolicy: Always
name: nginx-container
ports:
- containerPort: 80
protocol: TCP
resources: {}
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
volumeMounts:
- mountPath: /var/run/secrets/kubernetes.io/serviceaccount
name: default-token-sr2zb
readOnly: true
dnsPolicy: ClusterFirst
enableServiceLinks: true
nodeName: 192.168.163.132
priority: 0
restartPolicy: Always
schedulerName: default-scheduler
securityContext: {}
serviceAccount: default
serviceAccountName: default
terminationGracePeriodSeconds: 30
tolerations:
- effect: NoExecute
key: node.kubernetes.io/not-ready
operator: Exists
tolerationSeconds: 300
- effect: NoExecute
key: node.kubernetes.io/unreachable
operator: Exists
tolerationSeconds: 300
volumes:
- name: default-token-sr2zb
secret:
defaultMode: 420
secretName: default-token-sr2zb
status:
conditions:
- lastProbeTime: null
lastTransitionTime: "2019-08-31T03:38:02Z"
status: "True"
type: Initialized
- lastProbeTime: null
lastTransitionTime: "2019-08-31T03:38:06Z"
status: "True"
type: Ready
- lastProbeTime: null
lastTransitionTime: "2019-08-31T03:38:06Z"
status: "True"
type: ContainersReady
- lastProbeTime: null
lastTransitionTime: "2019-08-31T03:38:02Z"
status: "True"
type: PodScheduled
containerStatuses:
- containerID: docker://7f9635fbe242e255f52078132ad172364b266a9c52f837f2ca0347a2583e6abd
image: nginx:latest
imageID: docker-pullable://nginx@sha256:53ddb41e46de3d63376579acf46f9a41a8d7de33645db47a486de9769201fec9
lastState: {}
name: nginx-container
ready: true
restartCount: 0
state:
running:
startedAt: "2019-08-31T03:38:06Z"
hostIP: 192.168.163.132
phase: Running
podIP: 10.254.224.4
qosClass: BestEffort
startTime: "2019-08-31T03:38:02Z"
[root@host132 yaml]#
[root@host132 yaml]# kubectl get pods nginx -o json
{
"apiVersion": "v1",
"kind": "Pod",
"metadata": {
"creationTimestamp": "2019-08-31T03:38:02Z",
"name": "nginx",
"namespace": "default",
"resourceVersion": "37952",
"selfLink": "/api/v1/namespaces/default/pods/nginx",
"uid": "00e4d249-bf75-4506-a2dc-a3f51d0bd795"
},
"spec": {
"containers": [
{
"image": "nginx:latest",
"imagePullPolicy": "Always",
"name": "nginx-container",
"ports": [
{
"containerPort": 80,
"protocol": "TCP"
}
],
"resources": {},
"terminationMessagePath": "/dev/termination-log",
"terminationMessagePolicy": "File",
"volumeMounts": [
{
"mountPath": "/var/run/secrets/kubernetes.io/serviceaccount",
"name": "default-token-sr2zb",
"readOnly": true
}
]
}
],
"dnsPolicy": "ClusterFirst",
"enableServiceLinks": true,
"nodeName": "192.168.163.132",
"priority": 0,
"restartPolicy": "Always",
"schedulerName": "default-scheduler",
"securityContext": {},
"serviceAccount": "default",
"serviceAccountName": "default",
"terminationGracePeriodSeconds": 30,
"tolerations": [
{
"effect": "NoExecute",
"key": "node.kubernetes.io/not-ready",
"operator": "Exists",
"tolerationSeconds": 300
},
{
"effect": "NoExecute",
"key": "node.kubernetes.io/unreachable",
"operator": "Exists",
"tolerationSeconds": 300
}
],
"volumes": [
{
"name": "default-token-sr2zb",
"secret": {
"defaultMode": 420,
"secretName": "default-token-sr2zb"
}
}
]
},
"status": {
"conditions": [
{
"lastProbeTime": null,
"lastTransitionTime": "2019-08-31T03:38:02Z",
"status": "True",
"type": "Initialized"
},
{
"lastProbeTime": null,
"lastTransitionTime": "2019-08-31T03:38:06Z",
"status": "True",
"type": "Ready"
},
{
"lastProbeTime": null,
"lastTransitionTime": "2019-08-31T03:38:06Z",
"status": "True",
"type": "ContainersReady"
},
{
"lastProbeTime": null,
"lastTransitionTime": "2019-08-31T03:38:02Z",
"status": "True",
"type": "PodScheduled"
}
],
"containerStatuses": [
{
"containerID": "docker://7f9635fbe242e255f52078132ad172364b266a9c52f837f2ca0347a2583e6abd",
"image": "nginx:latest",
"imageID": "docker-pullable://nginx@sha256:53ddb41e46de3d63376579acf46f9a41a8d7de33645db47a486de9769201fec9",
"lastState": {},
"name": "nginx-container",
"ready": true,
"restartCount": 0,
"state": {
"running": {
"startedAt": "2019-08-31T03:38:06Z"
}
}
}
],
"hostIP": "192.168.163.132",
"phase": "Running",
"podIP": "10.254.224.4",
"qosClass": "BestEffort",
"startTime": "2019-08-31T03:38:02Z"
}
}
[root@host132 yaml]#
curl方式
获取所有pods信息
使用curl可以直接使用如下命令获取pod信息
curl命令：curl --header “Authorization: bearer token信息” -k https://192.168.163.132:6443/api/v1/pods
执行示例信息
[root@host132 ~]# bearer_token=`cat /etc/k8s/token.csv |awk -F, '{print $1}'`
[root@host132 ~]# header_option="Authorization: bearer $bearer_token"
[root@host132 ~]# curl --header "$header_option" -k https://192.168.163.132:6443/api/v1/pods
{
"kind": "PodList",
"apiVersion": "v1",
"metadata": {
"selfLink": "/api/v1/pods",
"resourceVersion": "39030"
},
"items": [
{
"metadata": {
"name": "coredns-b7d8c5745-tws2p",
"generateName": "coredns-b7d8c5745-",
"namespace": "kube-system",
"selfLink": "/api/v1/namespaces/kube-system/pods/coredns-b7d8c5745-tws2p",
"uid": "3fb8843a-5656-4dbf-b85d-ab347b8fb647",
"resourceVersion": "441",
"creationTimestamp": "2019-08-30T19:03:41Z",
"labels": {
"k8s-app": "kube-dns",
"pod-template-hash": "b7d8c5745"
},
"annotations": {
"seccomp.security.alpha.kubernetes.io/pod": "docker/default"
},
"ownerReferences": [
{
"apiVersion": "apps/v1",
"kind": "ReplicaSet",
"name": "coredns-b7d8c5745",
"uid": "cbf4908b-7013-4e66-ab09-28e8b3e7ea5d",
"controller": true,
"blockOwnerDeletion": true
}
]
},
"spec": {
"volumes": [
{
"name": "config-volume",
"configMap": {
"name": "coredns",
"items": [
{
"key": "Corefile",
"path": "Corefile"
}
],
"defaultMode": 420
}
},
{
"name": "coredns-token-czz8p",
"secret": {
"secretName": "coredns-token-czz8p",
"defaultMode": 420
}
}
],
"containers": [
{
"name": "coredns",
"image": "k8s.gcr.io/coredns:1.2.6",
"args": [
"-conf",
"/etc/coredns/Corefile"
],
"ports": [
{
"name": "dns",
"containerPort": 53,
"protocol": "UDP"
},
{
"name": "dns-tcp",
"containerPort": 53,
"protocol": "TCP"
},
{
"name": "metrics",
"containerPort": 9153,
"protocol": "TCP"
}
],
"resources": {
"limits": {
"memory": "170Mi"
},
"requests": {
"cpu": "100m",
"memory": "70Mi"
}
},
"volumeMounts": [
{
"name": "config-volume",
"readOnly": true,
"mountPath": "/etc/coredns"
},
{
"name": "coredns-token-czz8p",
"readOnly": true,
"mountPath": "/var/run/secrets/kubernetes.io/serviceaccount"
}
],
"livenessProbe": {
"httpGet": {
"path": "/health",
"port": 8080,
"scheme": "HTTP"
},
"initialDelaySeconds": 60,
"timeoutSeconds": 5,
"periodSeconds": 10,
"successThreshold": 1,
"failureThreshold": 5
},
"terminationMessagePath": "/dev/termination-log",
"terminationMessagePolicy": "File",
"imagePullPolicy": "IfNotPresent",
"securityContext": {
"capabilities": {
"add": [
"NET_BIND_SERVICE"
],
"drop": [
"all"
]
},
"readOnlyRootFilesystem": true,
"allowPrivilegeEscalation": false
}
}
],
"restartPolicy": "Always",
"terminationGracePeriodSeconds": 30,
"dnsPolicy": "Default",
"serviceAccountName": "coredns",
"serviceAccount": "coredns",
"nodeName": "192.168.163.132",
"securityContext": {
},
"schedulerName": "default-scheduler",
"tolerations": [
{
"key": "CriticalAddonsOnly",
"operator": "Exists"
},
{
"key": "node.kubernetes.io/not-ready",
"operator": "Exists",
"effect": "NoExecute",
"tolerationSeconds": 300
},
{
"key": "node.kubernetes.io/unreachable",
"operator": "Exists",
"effect": "NoExecute",
"tolerationSeconds": 300
}
],
"priority": 0,
"enableServiceLinks": true
},
"status": {
"phase": "Running",
"conditions": [
{
"type": "Initialized",
"status": "True",
"lastProbeTime": null,
"lastTransitionTime": "2019-08-30T19:04:07Z"
},
{
"type": "Ready",
"status": "True",
"lastProbeTime": null,
"lastTransitionTime": "2019-08-30T19:04:12Z"
},
{
"type": "ContainersReady",
"status": "True",
"lastProbeTime": null,
"lastTransitionTime": "2019-08-30T19:04:12Z"
},
{
"type": "PodScheduled",
"status": "True",
"lastProbeTime": null,
"lastTransitionTime": "2019-08-30T19:04:07Z"
}
],
"hostIP": "192.168.163.132",
"podIP": "10.254.224.2",
"startTime": "2019-08-30T19:04:07Z",
"containerStatuses": [
{
"name": "coredns",
"state": {
"running": {
"startedAt": "2019-08-30T19:04:10Z"
}
},
"lastState": {
},
"ready": true,
"restartCount": 0,
"image": "k8s.gcr.io/coredns:1.2.6",
"imageID": "docker://sha256:f59dcacceff45b5474d1385cd5f500d0c019ed9ca50ed5b814ac0c5fcec8699e",
"containerID": "docker://cc7a9e9b357b1a04ad3d8820439703f79304002285d3adbfb05e3ac929ae6b05"
}
],
"qosClass": "Burstable"
}
},
{
"metadata": {
"name": "kubernetes-dashboard-7d75c474bb-6dmt7",
"generateName": "kubernetes-dashboard-7d75c474bb-",
"namespace": "kube-system",
"selfLink": "/api/v1/namespaces/kube-system/pods/kubernetes-dashboard-7d75c474bb-6dmt7",
"uid": "e3266bce-deec-4531-b10e-33ca2e352f6d",
"resourceVersion": "450",
"creationTimestamp": "2019-08-30T19:04:09Z",
"labels": {
"k8s-app": "kubernetes-dashboard",
"pod-template-hash": "7d75c474bb"
},
"ownerReferences": [
{
"apiVersion": "apps/v1",
"kind": "ReplicaSet",
"name": "kubernetes-dashboard-7d75c474bb",
"uid": "f98118ce-7ce5-4540-a864-ab0fd22f1361",
"controller": true,
"blockOwnerDeletion": true
}
]
},
"spec": {
"volumes": [
{
"name": "kubernetes-dashboard-certs",
"secret": {
"secretName": "kubernetes-dashboard-certs",
"defaultMode": 420
}
},
{
"name": "tmp-volume",
"emptyDir": {
}
},
{
"name": "kubernetes-dashboard-token-5snr9",
"secret": {
"secretName": "kubernetes-dashboard-token-5snr9",
"defaultMode": 420
}
}
],
"containers": [
{
"name": "kubernetes-dashboard",
"image": "k8s.gcr.io/kubernetes-dashboard-amd64:v1.10.1",
"args": [
"--auto-generate-certificates"
],
"ports": [
{
"containerPort": 8443,
"protocol": "TCP"
}
],
"resources": {
},
"volumeMounts": [
{
"name": "kubernetes-dashboard-certs",
"mountPath": "/certs"
},
{
"name": "tmp-volume",
"mountPath": "/tmp"
},
{
"name": "kubernetes-dashboard-token-5snr9",
"readOnly": true,
"mountPath": "/var/run/secrets/kubernetes.io/serviceaccount"
}
],
"livenessProbe": {
"httpGet": {
"path": "/",
"port": 8443,
"scheme": "HTTPS"
},
"initialDelaySeconds": 30,
"timeoutSeconds": 30,
"periodSeconds": 10,
"successThreshold": 1,
"failureThreshold": 3
},
"terminationMessagePath": "/dev/termination-log",
"terminationMessagePolicy": "File",
"imagePullPolicy": "IfNotPresent"
}
],
"restartPolicy": "Always",
"terminationGracePeriodSeconds": 30,
"dnsPolicy": "ClusterFirst",
"serviceAccountName": "kubernetes-dashboard",
"serviceAccount": "kubernetes-dashboard",
"nodeName": "192.168.163.132",
"securityContext": {
},
"schedulerName": "default-scheduler",
"tolerations": [
{
"key": "node-role.kubernetes.io/master",
"effect": "NoSchedule"
},
{
"key": "node.kubernetes.io/not-ready",
"operator": "Exists",
"effect": "NoExecute",
"tolerationSeconds": 300
},
{
"key": "node.kubernetes.io/unreachable",
"operator": "Exists",
"effect": "NoExecute",
"tolerationSeconds": 300
}
],
"priority": 0,
"enableServiceLinks": true
},
"status": {
"phase": "Running",
"conditions": [
{
"type": "Initialized",
"status": "True",
"lastProbeTime": null,
"lastTransitionTime": "2019-08-30T19:04:09Z"
},
{
"type": "Ready",
"status": "True",
"lastProbeTime": null,
"lastTransitionTime": "2019-08-30T19:04:13Z"
},
{
"type": "ContainersReady",
"status": "True",
"lastProbeTime": null,
"lastTransitionTime": "2019-08-30T19:04:13Z"
},
{
"type": "PodScheduled",
"status": "True",
"lastProbeTime": null,
"lastTransitionTime": "2019-08-30T19:04:09Z"
}
],
"hostIP": "192.168.163.132",
"podIP": "10.254.224.3",
"startTime": "2019-08-30T19:04:09Z",
"containerStatuses": [
{
"name": "kubernetes-dashboard",
"state": {
"running": {
"startedAt": "2019-08-30T19:04:12Z"
}
},
"lastState": {
},
"ready": true,
"restartCount": 0,
"image": "k8s.gcr.io/kubernetes-dashboard-amd64:v1.10.1",
"imageID": "docker://sha256:f9aed6605b814b69e92dece6a50ed1e4e730144eb1cc971389dde9cb3820d124",
"containerID": "docker://87593e06072b3e2db1b6e33ac00e10b5d328b72c4b6bb9e35e9ea856c4536f75"
}
],
"qosClass": "BestEffort"
}
}
]
}[root@host132 ~]#
注意此处列出了kube-system的namespace下的pod
[root@host132 ~]# curl --header "$header_option" -k https://192.168.163.132:6443/api/v1/pods 2>/dev/null |grep -w name
"name": "coredns-b7d8c5745-tws2p",
"name": "coredns-b7d8c5745",
"name": "config-volume",
"name": "coredns",
"name": "coredns-token-czz8p",
"name": "coredns",
"name": "dns",
"name": "dns-tcp",
"name": "metrics",
"name": "config-volume",
"name": "coredns-token-czz8p",
"name": "coredns",
"name": "kubernetes-dashboard-7d75c474bb-6dmt7",
"name": "kubernetes-dashboard-7d75c474bb",
"name": "kubernetes-dashboard-certs",
"name": "tmp-volume",
"name": "kubernetes-dashboard-token-5snr9",
"name": "kubernetes-dashboard",
"name": "kubernetes-dashboard-certs",
"name": "tmp-volume",
"name": "kubernetes-dashboard-token-5snr9",
"name": "kubernetes-dashboard",
[root@host132 ~]# kubectl get pods -n kube-system
NAME READY STATUS RESTARTS AGE
coredns-b7d8c5745-tws2p 1/1 Running 0 8h
kubernetes-dashboard-7d75c474bb-6dmt7 1/1 Running 0 8h
[root@host132 ~]#
获取某特定namespace下所有pod信息
使用curl可以直接使用如下命令获取指定namespace下的pod信息（名为default的namespace下的pod信息）
kubectl命令：curl --header “Authorization: bearer token信息” -k https://192.168.163.132:6443/api/v1/namespaces/default/pods
执行示例信息
[root@host132 yaml]# curl --header "$header_option" -k https://192.168.163.132:6443/api/v1/namespaces/default/pods
{
"kind": "PodList",
"apiVersion": "v1",
"metadata": {
"selfLink": "/api/v1/namespaces/default/pods",
"resourceVersion": "42776"
},
"items": []
}[root@host132 yaml]# kubectl get pods -n default
No resources found.
[root@host132 yaml]#
获取指定namespace下指定pod信息
使用curl可以直接使用如下命令获取指定namespace下的指定pod信息（kube-system的namespace下的名为coredns-b7d8c5745-tws2p的pod）
kubectl命令：curl --header “Authorization: bearer token信息” -k https://192.168.163.132:6443/api/v1/namespaces/kube-system/pods/coredns-b7d8c5745-tws2p
执行示例信息
[root@host132 yaml]# kubectl get pods -n kube-system
NAME READY STATUS RESTARTS AGE
coredns-b7d8c5745-tws2p 1/1 Running 0 9h
kubernetes-dashboard-7d75c474bb-6dmt7 1/1 Running 0 9h
[root@host132 yaml]# curl --header "$header_option" -k https://192.168.163.132:6443/api/v1/namespaces/kube-system/pods/coredns-b7d8c5745-tws2p
{
"kind": "Pod",
"apiVersion": "v1",
"metadata": {
"name": "coredns-b7d8c5745-tws2p",
"generateName": "coredns-b7d8c5745-",
"namespace": "kube-system",
"selfLink": "/api/v1/namespaces/kube-system/pods/coredns-b7d8c5745-tws2p",
"uid": "3fb8843a-5656-4dbf-b85d-ab347b8fb647",
"resourceVersion": "441",
"creationTimestamp": "2019-08-30T19:03:41Z",
"labels": {
"k8s-app": "kube-dns",
"pod-template-hash": "b7d8c5745"
},
"annotations": {
"seccomp.security.alpha.kubernetes.io/pod": "docker/default"
},
"ownerReferences": [
{
"apiVersion": "apps/v1",
"kind": "ReplicaSet",
"name": "coredns-b7d8c5745",
"uid": "cbf4908b-7013-4e66-ab09-28e8b3e7ea5d",
"controller": true,
"blockOwnerDeletion": true
}
]
},
"spec": {
"volumes": [
{
"name": "config-volume",
"configMap": {
"name": "coredns",
"items": [
{
"key": "Corefile",
"path": "Corefile"
}
],
"defaultMode": 420
}
},
{
"name": "coredns-token-czz8p",
"secret": {
"secretName": "coredns-token-czz8p",
"defaultMode": 420
}
}
],
"containers": [
{
"name": "coredns",
"image": "k8s.gcr.io/coredns:1.2.6",
"args": [
"-conf",
"/etc/coredns/Corefile"
],
"ports": [
{
"name": "dns",
"containerPort": 53,
"protocol": "UDP"
},
{
"name": "dns-tcp",
"containerPort": 53,
"protocol": "TCP"
},
{
"name": "metrics",
"containerPort": 9153,
"protocol": "TCP"
}
],
"resources": {
"limits": {
"memory": "170Mi"
},
"requests": {
"cpu": "100m",
"memory": "70Mi"
}
},
"volumeMounts": [
{
"name": "config-volume",
"readOnly": true,
"mountPath": "/etc/coredns"
},
{
"name": "coredns-token-czz8p",
"readOnly": true,
"mountPath": "/var/run/secrets/kubernetes.io/serviceaccount"
}
],
"livenessProbe": {
"httpGet": {
"path": "/health",
"port": 8080,
"scheme": "HTTP"
},
"initialDelaySeconds": 60,
"timeoutSeconds": 5,
"periodSeconds": 10,
"successThreshold": 1,
"failureThreshold": 5
},
"terminationMessagePath": "/dev/termination-log",
"terminationMessagePolicy": "File",
"imagePullPolicy": "IfNotPresent",
"securityContext": {
"capabilities": {
"add": [
"NET_BIND_SERVICE"
],
"drop": [
"all"
]
},
"readOnlyRootFilesystem": true,
"allowPrivilegeEscalation": false
}
}
],
"restartPolicy": "Always",
"terminationGracePeriodSeconds": 30,
"dnsPolicy": "Default",
"serviceAccountName": "coredns",
"serviceAccount": "coredns",
"nodeName": "192.168.163.132",
"securityContext": {
},
"schedulerName": "default-scheduler",
"tolerations": [
{
"key": "CriticalAddonsOnly",
"operator": "Exists"
},
{
"key": "node.kubernetes.io/not-ready",
"operator": "Exists",
"effect": "NoExecute",
"tolerationSeconds": 300
},
{
"key": "node.kubernetes.io/unreachable",
"operator": "Exists",
"effect": "NoExecute",
"tolerationSeconds": 300
}
],
"priority": 0,
"enableServiceLinks": true
},
"status": {
"phase": "Running",
"conditions": [
{
"type": "Initialized",
"status": "True",
"lastProbeTime": null,
"lastTransitionTime": "2019-08-30T19:04:07Z"
},
{
"type": "Ready",
"status": "True",
"lastProbeTime": null,
"lastTransitionTime": "2019-08-30T19:04:12Z"
},
{
"type": "ContainersReady",
"status": "True",
"lastProbeTime": null,
"lastTransitionTime": "2019-08-30T19:04:12Z"
},
{
"type": "PodScheduled",
"status": "True",
"lastProbeTime": null,
"lastTransitionTime": "2019-08-30T19:04:07Z"
}
],
"hostIP": "192.168.163.132",
"podIP": "10.254.224.2",
"startTime": "2019-08-30T19:04:07Z",
"containerStatuses": [
{
"name": "coredns",
"state": {
"running": {
"startedAt": "2019-08-30T19:04:10Z"
}
},
"lastState": {
},
"ready": true,
"restartCount": 0,
"image": "k8s.gcr.io/coredns:1.2.6",
"imageID": "docker://sha256:f59dcacceff45b5474d1385cd5f500d0c019ed9ca50ed5b814ac0c5fcec8699e",
"containerID": "docker://cc7a9e9b357b1a04ad3d8820439703f79304002285d3adbfb05e3ac929ae6b05"
}
],
"qosClass": "Burstable"
}
}[root@host132 yaml]#
创建新的pod
使用curl可以直接使用如下命令在default的namespace下创建新的名为nginx的pod
curl命令：curl -k -X POST --header “Content-Type: application/json”
–header “Authorization: bearer $bearer_token”
https://192.168.163.132:6443/api/v1/namespaces/default/pods [email protected]
json信息如下所示
[root@host132 json]# cat pod-demo1.json
{
"kind": "Pod",
"apiVersion": "v1",
"metadata":{
"name": "nginx",
"namespace": "default"
},
"spec": {
"containers": [{
"name": "nginx-container",
"image": "nginx:latest",
"ports": [{"containerPort": 80}]
}]
}
}
[root@host132 json]#
执行示例信息
[root@host132 json]# kubectl get pods -n default -o wide
No resources found.
[root@host132 json]# curl -k -X POST --header "Content-Type: application/json" \
> --header "Authorization: bearer $bearer_token" \
> https://192.168.163.132:6443/api/v1/namespaces/default/pods [email protected]
{
"kind": "Pod",
"apiVersion": "v1",
"metadata": {
"name": "nginx",
"namespace": "default",
"selfLink": "/api/v1/namespaces/default/pods/nginx",
"uid": "888bf42d-0b8d-40a9-8295-73f17eb45272",
"resourceVersion": "44969",
"creationTimestamp": "2019-08-31T05:13:34Z"
},
"spec": {
"volumes": [
{
"name": "default-token-sr2zb",
"secret": {
"secretName": "default-token-sr2zb",
"defaultMode": 420
}
}
],
"containers": [
{
"name": "nginx-container",
"image": "nginx:latest",
"ports": [
{
"containerPort": 80,
"protocol": "TCP"
}
],
"resources": {
},
"volumeMounts": [
{
"name": "default-token-sr2zb",
"readOnly": true,
"mountPath": "/var/run/secrets/kubernetes.io/serviceaccount"
}
],
"terminationMessagePath": "/dev/termination-log",
"terminationMessagePolicy": "File",
"imagePullPolicy": "Always"
}
],
"restartPolicy": "Always",
"terminationGracePeriodSeconds": 30,
"dnsPolicy": "ClusterFirst",
"serviceAccountName": "default",
"serviceAccount": "default",
"securityContext": {
},
"schedulerName": "default-scheduler",
"tolerations": [
{
"key": "node.kubernetes.io/not-ready",
"operator": "Exists",
"effect": "NoExecute",
"tolerationSeconds": 300
},
{
"key": "node.kubernetes.io/unreachable",
"operator": "Exists",
"effect": "NoExecute",
"tolerationSeconds": 300
}
],
"priority": 0,
"enableServiceLinks": true
},
"status": {
"phase": "Pending",
"qosClass": "BestEffort"
}
}[root@host132 json]#
[root@host132 json]# kubectl get pods -n default -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx 1/1 Running 0 6s 10.254.224.4 192.168.163.132
[root@host132 json]#
删除指定的pod
使用curl可以直接使用如下命令删除指定的namespace下的名为nginx的pod
curl命令：curl -k -X DELETE --header “Content-Type: application/json”
–header “Authorization: bearer $bearer_token”
https://192.168.163.132:6443/api/v1/namespaces/default/pods/nginx
执行示例信息
[root@host132 json]# kubectl get pods -n default -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx 1/1 Running 0 2m24s 10.254.224.4 192.168.163.132
[root@host132 json]# curl -k -X DELETE --header "Content-Type: application/json" \
> --header "Authorization: bearer $bearer_token" \
> https://192.168.163.132:6443/api/v1/namespaces/default/pods/nginx
{
"kind": "Pod",
"apiVersion": "v1",
"metadata": {
"name": "nginx",
"namespace": "default",
"selfLink": "/api/v1/namespaces/default/pods/nginx",
"uid": "888bf42d-0b8d-40a9-8295-73f17eb45272",
"resourceVersion": "45178",
"creationTimestamp": "2019-08-31T05:13:34Z",
"deletionTimestamp": "2019-08-31T05:16:49Z",
"deletionGracePeriodSeconds": 30
},
"spec": {
"volumes": [
{
"name": "default-token-sr2zb",
"secret": {
"secretName": "default-token-sr2zb",
"defaultMode": 420
}
}
],
"containers": [
{
"name": "nginx-container",
"image": "nginx:latest",
"ports": [
{
"containerPort": 80,
"protocol": "TCP"
}
],
"resources": {
},
"volumeMounts": [
{
"name": "default-token-sr2zb",
"readOnly": true,
"mountPath": "/var/run/secrets/kubernetes.io/serviceaccount"
}
],
"terminationMessagePath": "/dev/termination-log",
"terminationMessagePolicy": "File",
"imagePullPolicy": "Always"
}
],
"restartPolicy": "Always",
"terminationGracePeriodSeconds": 30,
"dnsPolicy": "ClusterFirst",
"serviceAccountName": "default",
"serviceAccount": "default",
"nodeName": "192.168.163.132",
"securityContext": {
},
"schedulerName": "default-scheduler",
"tolerations": [
{
"key": "node.kubernetes.io/not-ready",
"operator": "Exists",
"effect": "NoExecute",
"tolerationSeconds": 300
},
{
"key": "node.kubernetes.io/unreachable",
"operator": "Exists",
"effect": "NoExecute",
"tolerationSeconds": 300
}
],
"priority": 0,
"enableServiceLinks": true
},
"status": {
"phase": "Running",
"conditions": [
{
"type": "Initialized",
"status": "True",
"lastProbeTime": null,
"lastTransitionTime": "2019-08-31T05:13:34Z"
},
{
"type": "Ready",
"status": "True",
"lastProbeTime": null,
"lastTransitionTime": "2019-08-31T05:13:38Z"
},
{
"type": "ContainersReady",
"status": "True",
"lastProbeTime": null,
"lastTransitionTime": "2019-08-31T05:13:38Z"
},
{
"type": "PodScheduled",
"status": "True",
"lastProbeTime": null,
"lastTransitionTime": "2019-08-31T05:13:34Z"
}
],
"hostIP": "192.168.163.132",
"podIP": "10.254.224.4",
"startTime": "2019-08-31T05:13:34Z",
"containerStatuses": [
{
"name": "nginx-container",
"state": {
"running": {
"startedAt": "2019-08-31T05:13:37Z"
}
},
"lastState": {
},
"ready": true,
"restartCount": 0,
"image": "nginx:latest",
"imageID": "docker-pullable://nginx@sha256:53ddb41e46de3d63376579acf46f9a41a8d7de33645db47a486de9769201fec9",
"containerID": "docker://94ac7856d2bca02d69826bed1fccd691108cc9881d98c143906d19106c14ae84"
}
],
"qosClass": "BestEffort"
}
}[root@host132 json]#kubectl get pods -n default -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx 0/1 Terminating 0 2m50s 10.254.224.4 192.168.163.132
[root@host132 json]# kubectl get pods -n default -o wide
No resources found.
[root@host132 json]#
可以看到在执行之后，第一次使用kubectl get pods确认的时候显示名为nginx的pod的状态为Terminating，说明此时正在删除，稍等之后再次执行则可以看到已经成功删除了
Restful API方式常见问题
- https://liumiaocn.blog.csdn.net/article/details/100518110
其他基础
- 再探kubernetes