docker+k8s|k8s总结 docker+k8s|docker

避免dns在同一个机器

kubectl edit deploy/coredns -n kube-system

template: metadata: creationTimestamp: null labels: k8s-app: kube-dns spec: affinity:# 添加start podAntiAffinity: preferredDuringSchedulingIgnoredDuringExecution: - podAffinityTerm: labelSelector: matchExpressions: - key: k8s-app operator: In values: - kube-dns topologyKey: kubernetes.io/hostname weight: 100# 添加end containers: - args: - -conf - /etc/coredns/Corefile image: k8s.gcr.io/coredns:1.2.6 imagePullPolicy: IfNotPresent`

k8s命令

kubeadm token create --print-join-command 生成新的集群token
kubectl expose rc kubia --type=NodePort --name kubia-http 部署service的方式
kubectl get pods -o wide 查看pods在那个节点
kubectl get nodes -o wide 查看nodes详情
kubectl describe pod kubia-lx6vz 查看pod详情
kubectl get po kubia-74vt8 -o yaml 查看已部署的pod的yaml文件
kubectl delete pods --all --grace-period=0 --force 删除所有的pods
kubectl run kubia --image=172.16.24.207:5000/kubia --port=8080 --generator=run/v1 创建服务
kubectl expose rc kubia --type=NodePort --name kubia-http 创建service --type=nodeport可以通过nodeip+serviceport访问
kubectl scale rc kubia --replicas=3 为kubia水平扩展
kubectl get replicationcontrollers 查看水平扩展情况 kubectl get rc
kubectl get deployment 查看dm信息
kubectl create -f kubia-manual.yaml 用kubia-manual.yaml创建pod
kubectl logs kubia-manual -c kubia 查看pod日志
kubectl port-forward kubia-manual 8888:8080 通过端口转发链接pod
kubectl get pods --show-labels 展示带lable的pods
kubectl label po kubia-manual creation_method=manual 给现有pod添加label
kubectl label po kubia-manual-v2 env=debug --overwrite 更改现有pod的label
kubectl get pod -l creation_method=manual 通过标签选出pod
kubectl label node node1 gpu=true 为node1添加标签 gpu=true
kubectl get nodes -l gpu=true 显示标签为gpu=true的node
kubectl get ns 查看命名空间
kubectl delete pod --all 删除当前命名空间的所有pod
kubectl get cs 获取集群状态
kubectl delete pod rtb-adapter-gdt-yz2-5120-spqrp --grace-period=0 --force 强制删除pod会减少副本数
kubectl label node nodename app=kubia
kubectl rolling-update my-replication-controller --image=nginx:1.13.7滚动升级

【docker+k8s|k8s总结】3.打印初始化文件和加入文件

kubeadm config print init-defaults 初始化文件
kubeadm config print join-defaults 加入集群config

4.初始化文件

apiVersion: kubeadm.k8s.io/v1beta2 kind: InitConfiguration bootstrapTokens: - groups: - system:bootstrappers:kubeadm:default-node-token token: abcdef.0123456789abcdef ttl: 24h0m0s usages: - signing - authentication --- imageRepository: harbor.emarbox.com/yzhtest apiVersion: kubeadm.k8s.io/v1beta2 kind: ClusterConfiguration kubernetesVersion: v1.19.3 certificatesDir: /etc/kubernetes/pki clusterName: kubernetes controlPlaneEndpoint: 172.16.107.15:8443 controllerManager: {} etcd: external: endpoints: - http://172.16.107.13:2379 - http://172.16.107.14:2379 - http://172.16.107.16:2379 networking: dnsDomain: cluster.local serviceSubnet: 10.96.0.0/12 podSubnet: 10.244.0.0/16 apiServer: extraArgs: v: "2" logtostderr: "false" log-dir: "/var/log/kubernetes" extraVolumes: - name: "k8s-log" hostPath: "/var/log/kubernetes" mountPath: "/var/log/kubernetes" pathType: "DirectoryOrCreate" - name: "timezone" hostPath: "/etc/localtime" mountPath: "/etc/localtime" readOnly: true pathType: "File" timeoutForControlPlane: 4m0s certSANs: - emarsys107013 - emarsys107014 - emarsys107016 - "172.16.107.13" - "172.16.107.14" - "172.16.107.15" - "172.16.107.16" controllerManager: extraArgs: bind-address: 0.0.0.0 experimental-cluster-signing-duration: "87600h" v: "2" logtostderr: "false" log-dir: "/var/log/kubernetes" extraVolumes: - name: "k8s-log" hostPath: "/var/log/kubernetes" mountPath: "/var/log/kubernetes" pathType: "DirectoryOrCreate" - name: "timezone" hostPath: "/etc/localtime" mountPath: "/etc/localtime" readOnly: true pathType: "File" scheduler: extraArgs: address: 0.0.0.0 v: "2" logtostderr: "false" log-dir: "/var/log/kubernetes" extraVolumes: - name: "k8s-log" hostPath: "/var/log/kubernetes" mountPath: "/var/log/kubernetes" pathType: "DirectoryOrCreate" - name: "timezone" hostPath: "/etc/localtime" mountPath: "/etc/localtime" readOnly: true pathType: "File" dns: type: CoreDNS --- apiVersion: kubelet.config.k8s.io/v1beta1 kind: KubeletConfiguration failSwapOn: false cgroupDriver: systemd rotateCertificates: true evictionHard: "imagefs.available": "8%" "memory.available": "256Mi" "nodefs.available": "8%" "nodefs.inodesFree": "5%"