标签：下载 box group probe org value mina app project
本文收录在容器技术学习系列文章总目录
（1）例如查询如何定义pod资源
[root@master ~]# kubectl explain pod
KIND: Pod
VERSION: v1
DESCRIPTION:
Pod is a collection of containers that can run on a host. This resource is
created by clients and scheduled onto hosts.
FIELDS:
apiVersion <string>
... ...
kind <string>
... ...
metadata <Object>
... ...
spec <Object>
... ...
status <Object>
... ...
（2）能一级一级进入查询；如查询定义pod 的metadata字段
[root@master ~]# kubectl explain pod.spec KIND: Pod VERSION: v1 RESOURCE: spec <Object> DESCRIPTION: ... ... FIELDS: ... .. affinity <Object> ... ... [root@master ~]# kubectl explain pod.spec.containers KIND: Pod VERSION: v1 RESOURCE: containers <[]Object> DESCRIPTION: ... ... FIELDS: args <[]string> ... ... command <[]string> ... ...
自己定义资源时，不清楚如何定义，可以进行快速的查询
（1）查询集群中的pod（上篇创建的pod）
[root@master ~]# kubectl get pods NAME READY STATUS RESTARTS AGE client 1/1 Running 0 4h myapp-848b5b879b-9slqg 1/1 Running 0 46m myapp-848b5b879b-wtrjr 1/1 Running 0 46m myapp-848b5b879b-z2sqc 1/1 Running 0 46m
（2）-o yaml输出为yaml格式，查看pod创建的操作
[root@master ~]# kubectl get pod myapp-848b5b879b-9slqg -o yaml
apiVersion: v1 #api版本
kind: Pod #资源类别
metadata: #元数据
annotations:
cni.projectcalico.org/podIP: 10.244.1.60/32
labels:
pod-template-hash: "4046164356"
run: myapp
name: myapp-848b5b879b-9slqg
namespace: default
... ...
selfLink: /api/v1/namespaces/default/pods/myapp-848b5b879b-9slqg
spec: #规格、规范；期望资源应该用于什么特性；期望目标状态
... ...
status: #当前状态
... ...
[root@master ~]# mkdir manifests [root@master ~]# cd manifests/
（1）编写pod-demo.yaml文件
创建2个容器，一个运行nginx；一个在busybox中执行sleep命令
[root@master manifests]# vim pod-demo.yaml
apiVersion: v1
kind: Pod
metadata:
name: pod-demo
namespace: default
#labels: {app:myapp, tier:frontend} #映射可以写为{}形式;
labels: #也可以在下边分级写
app: myapp
tier: frontend
spec:
containers:
- name: myapp
image: ikubernetes/myapp:v1
- name: busybox
image: busybox:latest
#command: ["/bin/sh","-c","sleep 3600"] #列表可以写为[]形式;
command: #也可以在下边分级写,要加-
- "/bin/sh"
- "-c"
- "sleep 3600"
（2）基于pod-demo.yaml 文件创建create pod
[root@master manifests]# kubectl create -f pod-demo.yaml pod/pod-demo created
（3）验证
① 查询创建pod的信息
[root@master manifests]# kubectl create -f pod-demo.yaml pod/pod-demo created [root@master manifests]# kubectl get pods -o wide NAME READY STATUS RESTARTS AGE IP NODE pod-demo 2/2 Running 0 1m 10.244.1.61 node1 ---查看详细信息 [root@master manifests]# kubectl describe pods pod-demo Name: pod-demo Namespace: default ... ...
② 访问pod中的服务
[root@master manifests]# curl 10.244.1.61 Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a> ---查询pod产生的日志 [root@master manifests]# kubectl logs pod-demo myapp 192.168.130.104 - - [23/Jan/2019:05:35:35 +0000] "GET / HTTP/1.1" 200 65 "-" "curl/7.29.0" "-"
③ 基于yaml文件删除pod
[root@master manifests]# kubectl delete -f pod-demo.yaml pod "pod-demo" deleted [root@master manifests]# kubectl get pods No resources found.
（1）修改pod-demo.yaml文件
[root@master manifests]# vim pod-demo.yaml
apiVersion: v1
kind: Pod
metadata:
name: pod-demo
namespace: default
#labels: {app:myapp, tier:frontend} #映射可以写为{}形式;
labels: #也可以在下边分级写
app: myapp
tier: frontend
annotations:
along.com/created-by: "cluster admin"
spec:
containers:
- name: myapp
image: ikubernetes/myapp:v1
ports:
- name: http
containerPort: 80
- name: https
containerPort: 443
- name: busybox
image: busybox:latest
imagePullPolicy: IfNotPresent
#command: ["/bin/sh","-c","sleep 3600"] #列表可以写为[]形式;
command: #也可以在下边分级写,要加-
- "/bin/sh"
- "-c"
- "sleep 3600"
nodeSelector:
disktype: ssd
（2）将node1节点打上disktype=ssd的标签
[root@master manifests]# kubectl label node node1 disktype=ssd [root@master manifests]# kubectl get nodes node1 --show-labels NAME STATUS ROLES AGE VERSION LABELS node1 Ready <none> 140d v1.11.2 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,disktype=ssd,kubernetes.io/hostname=node1
（3）基于yaml文件创建pod
[root@master manifests]# kubectl create -f pod-demo.yaml pod/pod-demo created
（4）验证
--- pod只会创建到node1节点上，因为node1的disktype=ssd标签 [root@master manifests]# kubectl get pod -o wide NAME READY STATUS RESTARTS AGE IP NODE pod-demo 2/2 Running 0 11s 10.244.1.68 node1 --- -l 指定标签，实现标签过滤 [root@master manifests]# kubectl get pods --show-labels -l app NAME READY STATUS RESTARTS AGE LABELS pod-demo 2/2 Running 0 30s app=myapp,tier=frontend
（1）在spec字段下、containers字段配置，可使用explain查看详细用法
$ kubectl explain pod.spec.containers.
（2）pod中容器挂了，是否重启pod
$ kubectl explain pod.spec.restartPolicy.
（1）编写yaml文件
当探测到/tmp/healthy文件不存在时，认为服务故障；
容器在30秒后执行删除/tmp/healthy文件
[root@master manifests]# vim liveness-exec.yaml
apiVersion: v1
kind: Pod
metadata:
name: liveness-exec-pod
namespace: default
spec:
containers:
- name: liveness-exec-container
image: busybox:latest
imagePullPolicy: IfNotPresent
command: ["/bin/sh","-c","touch /tmp/healthy; sleep 30; rm -f /tmp/healthy; sleep 3600"]
livenessProbe:
exec:
command: ["test","-e","/tmp/healthy"]
initialDelaySeconds: 1 #在容器启动后1秒开始检测
periodSeconds: 3 #每隔3秒探测一次
restartPolicy: Always #总是重启pod
（2）创建运行pod
[root@master manifests]# kubectl create -f liveness-exec.yaml pod/liveness-exec-pod created [root@master manifests]# kubectl get pods NAME READY STATUS RESTARTS AGE liveness-exec-pod 1/1 Running 0 6s
（3）等30s，容器就会检测失败，重启pod；使用describe可以查看详细信息
[root@master manifests]# kubectl describe pods liveness-exec-pod
... ...
State: Running
Started: Wed, 23 Jan 2019 16:58:09 +0800
Last State: Terminated #上次状态为终止
Reason: Error
Exit Code: 137
Started: Wed, 23 Jan 2019 16:57:01 +0800
Finished: Wed, 23 Jan 2019 16:58:09 +0800
Ready: True
Restart Count: 1 #重启次数1次
Liveness: exec [test -e /tmp/healthy] delay=1s timeout=1s period=3s #success=1 #failure=3
... ...
（1）编写yaml文件，创建并运行pod
当探测不到容器内80端口，和提供80端口的/index.html文件时，认为服务故障；
[root@master manifests]# vim liveness-httpget.yaml
apiVersion: v1
kind: Pod
metadata:
name: liveness-httpget-pod
namespace: default
spec:
containers:
- name: liveness-exec-container
image: ikubernetes/myapp:v1
ports:
- name: http
containerPort: 80
livenessProbe:
httpget:
port: http
path: /index.html
initialDelaySeconds: 1
periodSeconds: 3
restartPolicy: Always
[root@master manifests]# kubectl create -f liveness-httpget.yaml
pod/liveness-httpget-pod created
（2）手动连入容器，删除index.html文件
[root@master manifests]# kubectl exec -it liveness-httpget-pod -- /bin/sh / # rm -f /usr/share/nginx/html/index.html
（3）容器会检测失败，重启pod；使用describe可以查看详细信息
[root@master manifests]# kubectl describe pods liveness-httpget-pod
... ...
Port: 80/TCP
Host Port: 0/TCP
State: Running
Started: Wed, 23 Jan 2019 17:10:03 +0800
Last State: Terminated #上次状态为终止
Reason: Completed
Exit Code: 0
Started: Wed, 23 Jan 2019 17:08:22 +0800
Finished: Wed, 23 Jan 2019 17:10:03 +0800
Ready: True
Restart Count: 1 #重启次数1次
Liveness: http-get http://:http/index.html delay=1s timeout=1s period=3s #success=1 #failure=3
... ...
（1）编写yaml文件，创建启动容器
当探测到/tmp/healthy文件不存在时，就认为服务就绪不成功；pod启动失败；
[root@master manifests]# vim readiness-exec.yaml
apiVersion: v1
kind: Pod
metadata:
name: readiness-exec-pod
namespace: default
spec:
containers:
- name: readiness-exec-container
image: busybox:latest
imagePullPolicy: IfNotPresent
#command: ["/bin/sh","-c","touch /tmp/healthy; sleep 30; rm -f /tmp/healthy; sleep 3600"]
command: ["sleep 3600"]
readinessProbe:
exec:
command: ["test","-e","/tmp/healthy"]
periodSeconds: 3
restartPolicy: Always
[root@master manifests]# kubectl create -f readiness-exec.yaml
pod/readiness-exec-pod created
（2）查看，pod启动就绪失败
[root@master ~]# kubectl get pods NAME READY STATUS RESTARTS AGE readiness-exec-pod 0/1 RunContainerError 1 12s
$ kubectl explain pod.spec.containers.lifecycle
（1）编写yaml文件，创建启动容器
启动容器前，先创建准备一个httpd服务的主页面文件/tmp/index.html
[root@master manifests]# vim poststart-pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: poststart-pod
namespace: default
spec:
containers:
- name: poststart-container
image: busybox:latest
imagePullPolicy: IfNotPresent
lifecycle:
postStart:
exec:
command: [‘/bin/sh‘,‘-c‘,‘echo hello > /tmp/index.html‘]
command: [‘/bin/sh‘,‘-c‘,‘/bin/httpd -f -h /tmp‘]
[root@master manifests]# kubectl create -f poststart-pod.yaml
pod/poststart-pod created
（2）验证，访问服务
[root@master ~]# kubectl get pods -o wide NAME READY STATUS RESTARTS AGE IP NODE poststart-pod 1/1 Running 0 26s 10.244.2.69 node2 [root@master ~]# curl 10.244.2.69 hello
kubernetes系列06—kubernetes资源清单定义入门
标签：下载 box group probe org value mina app project
原文地址：https://www.cnblogs.com/along21/p/10313341.html
