KUBECTL 命令使用
kubectl 查看所有flag是否有简称
#kubectl api-resources
NAME SHORTNAMES APIGROUP NAMESPACED KIND
bindings true Binding
componentstatuses cs false ComponentStatus
configmaps cm true ConfigMap
endpoints ep true Endpoints
events ev true Event
limitranges limits true LimitRange
namespaces ns false Namespace
nodes no false Node
persistentvolumeclaims pvc true PersistentVolumeClaim
persistentvolumes pv false PersistentVolume
pods po true Pod
podtemplates true PodTemplate
replicationcontrollers rc true ReplicationController
resourcequotas quota true ResourceQuota
secrets true Secret
serviceaccounts sa true ServiceAccount
services svc true Service
mutatingwebhookconfigurations admissionregistration.k8s.io false MutatingWebhookConfiguration
validatingwebhookconfigurations admissionregistration.k8s.io false ValidatingWebhookConfiguration
customresourcedefinitions crd,crds apiextensions.k8s.io false CustomResourceDefinition
apiservices apiregistration.k8s.io false APIService
controllerrevisions apps true ControllerRevision
daemonsets ds apps true DaemonSet
deployments deploy apps true Deployment
replicasets rs apps true ReplicaSet
statefulsets sts apps true StatefulSet
tokenreviews authentication.k8s.io false TokenReview
localsubjectacce***eviews authorization.k8s.io true LocalSubjectAcce***eview
selfsubjectacce***eviews authorization.k8s.io false SelfSubjectAcce***eview
selfsubjectrulesreviews authorization.k8s.io false SelfSubjectRulesReview
subjectacce***eviews authorization.k8s.io false SubjectAcce***eview
horizontalpodautoscalers hpa autoscaling true HorizontalPodAutoscaler
cronjobs cj batch true CronJob
jobs batch true Job
certificatesigningrequests csr certificates.k8s.io false CertificateSigningRequest
leases coordination.k8s.io true Lease
events ev events.k8s.io true Event
daemonsets ds extensions true DaemonSet
deployments deploy extensions true Deployment
ingresses ing extensions true Ingress
networkpolicies netpol extensions true NetworkPolicy
podsecuritypolicies psp extensions false PodSecurityPolicy
replicasets rs extensions true ReplicaSet
networkpolicies netpol networking.k8s.io true NetworkPolicy
poddisruptionbudgets pdb policy true PodDisruptionBudget
podsecuritypolicies psp policy false PodSecurityPolicy
clusterrolebindings rbac.authorization.k8s.io false ClusterRoleBinding
clusterroles rbac.authorization.k8s.io false ClusterRole
rolebindings rbac.authorization.k8s.io true RoleBinding
roles rbac.authorization.k8s.io true Role
priorityclasses pc scheduling.k8s.io false PriorityClass
storageclasses sc storage.k8s.io false StorageClass
volumeattachments storage.k8s.io false VolumeAttachment查看所有命名空间
#kubectl get ns
NAME STATUS AGE
default Active 7d23h
kube-public Active 7d23h
kube-system Active 7d23h查看所有命名空间的pod信息
#kubectl get pod --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system coredns-779dfc4d59-6q6ks 1/1 Running 0 3d19h
kube-system coredns-779dfc4d59-996fz 1/1 Running 0 3d19h
kube-system coredns-779dfc4d59-gs8sm 1/1 Running 0 3d20h
kube-system kubernetes-dashboard-66bddbb896-sjg92 1/1 Running 0 43h查看某一命名空间的pod信息
#kubectl get pod -n kube-system -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE
coredns-779dfc4d59-6q6ks 1/1 Running 0 3d19h 10.10.62.2 172.16.0.8
coredns-779dfc4d59-996fz 1/1 Running 0 3d19h 10.10.2.2 172.16.0.10
coredns-779dfc4d59-gs8sm 1/1 Running 0 3d20h 10.10.54.2 172.16.0.9
kubernetes-dashboard-66bddbb896-sjg92 1/1 Running 0 43h 10.10.62.3 172.16.0.8 查看某一命名空间的pod,svc,ep,secret信息
#kubectl get pod,svc,ep,secret -n kube-system -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE
pod/coredns-779dfc4d59-6q6ks 1/1 Running 0 3d19h 10.10.62.2 172.16.0.8
pod/coredns-779dfc4d59-996fz 1/1 Running 0 3d19h 10.10.2.2 172.16.0.10
pod/coredns-779dfc4d59-gs8sm 1/1 Running 0 3d20h 10.10.54.2 172.16.0.9
pod/kubernetes-dashboard-66bddbb896-sjg92 1/1 Running 0 43h 10.10.62.3 172.16.0.8
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
service/kube-dns ClusterIP 169.169.0.2 53/UDP,53/TCP 3d20h k8s-app=kube-dns
service/kubernetes-dashboard NodePort 169.169.1.125 443:40487/TCP 43h k8s-app=kubernetes-dashboard
NAME ENDPOINTS AGE
endpoints/kube-controller-manager 7d23h
endpoints/kube-dns 10.10.2.2:53,10.10.54.2:53,10.10.62.2:53 + 3 more... 3d20h
endpoints/kube-scheduler 7d23h
endpoints/kubernetes-dashboard 10.10.62.3:8443 43h
NAME TYPE DATA AGE
secret/admin-token-wbjtp kubernetes.io/service-account-token 3 42h
secret/coredns-token-lxsg5 kubernetes.io/service-account-token 3 3d20h
secret/default-token-b4jq9 kubernetes.io/service-account-token 3 7d23h
secret/kubernetes-dashboard-certs Opaque 0 43h
secret/kubernetes-dashboard-key-holder Opaque 2 43h
secret/kubernetes-dashboard-token-tbkh5 kubernetes.io/service-account-token 3 43h 查看集群信息
#kubectl cluster-info
Kubernetes master is running at https://172.16.0.100:6443
CoreDNS is running at https://172.16.0.100:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
kubernetes-dashboard is running at https://172.16.0.100:6443/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy查看某一pod的详细信息
#kubectl describe pod/kubernetes-dashboard-66bddbb896-sjg92 -n kube-system
查看某一pod的log日志信息
#kubectl logs pod/kubernetes-dashboard-66bddbb896-sjg92 -n kube-system -f
-f：和tail -f命令一样的意思，实时日志打印查看所有已注册节点信息
#root@:#kubectl get nodes -o wide
NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
172.16.0.10 Ready 7d19h v1.12.0-rc.2 172.16.0.10 CentOS Linux 7 (Core) 3.10.0-862.14.4.el7.x86_64 docker://1.13.1
172.16.0.8 Ready 7d21h v1.12.0-rc.2 172.16.0.8 CentOS Linux 7 (Core) 3.10.0-862.14.4.el7.x86_64 docker://1.13.1
172.16.0.9 Ready 7d19h v1.12.0-rc.2 172.16.0.9 CentOS Linux 7 (Core) 3.10.0-862.14.4.el7.x86_64 docker://1.13.1
-o： 显示详细信息 查看k8s所有服务端所有组件状态是否正常
#root@:#kubectl get componentstatuses
NAME STATUS MESSAGE ERROR
scheduler Healthy ok
etcd-2 Healthy {"health": "true"}
etcd-0 Healthy {"health": "true"}
etcd-1 Healthy {"health": "true"}
controller-manager Healthy ok 扩展现有coredns的deployment
#root@:#kubectl get deploy -n kube-system
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
coredns 3 3 3 3 4d13h
kubernetes-dashboard 1 1 1 1 2d12h
再扩展相应部署
#root@:#kubectl scale --replicas=3 deploy coredns -n kube-system 更新已创建的svc
找到相应的svc
#root@:#kubectl get svc -n kube-system
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kube-dns ClusterIP 169.169.0.2 53/UDP,53/TCP 4d21h
kubernetes-dashboard NodePort 169.169.1.125 443:40487/TCP 2d19h
编辑相应的svc
#root@:#kubectl edit service kubernetes-dashboard --namespace=kube-system
# Please edit the object below. Lines beginning with a '#' will be ignored,
# and an empty file will abort the edit. If an error occurs while saving this file will be
# reopened with the relevant failures.
#
apiVersion: v1
kind: Service
metadata:
creationTimestamp: 2018-11-26T13:43:07Z
labels:
addonmanager.kubernetes.io/mode: Reconcile
k8s-app: kubernetes-dashboard
kubernetes.io/cluster-service: "true"
name: kubernetes-dashboard
namespace: kube-system
resourceVersion: "827241"
selfLink: /api/v1/namespaces/kube-system/services/kubernetes-dashboard
uid: 350c790f-f181-11e8-94ca-5254f7a51592
spec:
clusterIP: 169.169.1.125
externalTrafficPolicy: Cluster
ports:
- nodePort: 40487 删除此行,保留前面-
port: 443
protocol: TCP
targetPort: 8443
selector:
k8s-app: kubernetes-dashboard
sessionAffinity: None
type: NodePort 删除此行
status:
loadBalancer: {}
注:edit命令允许你直接编辑使用命令行工具获取的任何资源,但如果编辑出错,你在保存会提示错误,如下:
并在/tmp目录下面生成一个临时文件,其实你并示修改成功
"/tmp/kubectl-edit-hfgsa.yaml" 33L, 999C written
A copy of your changes has been stored to "/tmp/kubectl-edit-hfgsa.yaml"
error: Edit cancelled, no valid changes were saved.我现在要取消kubernetes-dashboard的NodePort
root@:#kubectl get svc -n kube-system
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kube-dns ClusterIP 169.169.0.2 53/UDP,53/TCP 4d21h
kubernetes-dashboard NodePort 169.169.1.125 443:40487/TCP 2d20h
正确做法是删除上面二行内容
nodePort: 40487 但这一行前面那个-要保留
type: NodePort
然后保存,没有报警说明修改成功,然后再执行以下命令检查
#root@:#kubectl get svc -n kube-system
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kube-dns ClusterIP 169.169.0.2 53/UDP,53/TCP 4d21h
kubernetes-dashboard ClusterIP 169.169.1.125 443/TCP 2d20h #type变为clusterip,nodepor也不见了,说明修改成功 查看pods所有标签
kubectl get pods --show-labels根据标签查看pods
kubectl get pods -l app=nginx滚动更新镜像
kubectl set image deployment/nginx-deployment nginx=nginx:1.11或者
kubectl edit deployment/nginx-deploymentconfigmap配置
将文件定义为configmap用法
复制tomcatr 的二个配置 文件 到相应的目录下面
root@:#ls
logging.properties server.xml
执t行下面命令创建tomcat-link的configmap
root@:#kubectl create configmap tomcat-link --from-file=serverxml=server.xml --from-file=loggingproperties=logging.properties -n k8s-go
configmap/tomcat-link created
或者
root@:#kubectl create configmap tomcat-link --from-file=logging.properties --from-file=server.xml
configmap/tomcat-link created
或者
root@:#kubectl create configmap tomcat-link --from-file=tomcat-link
configmap/tomcat-link created
查看执行结果
root@:#kubectl describe configmap tomcat-link |more
Name: tomcat-link
Namespace: default
Labels:
Annotations:
Data
====
loggingproperties:
----
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
省略........
serverxml:
----