【Kubernetes】一些自己的常用命令, 不定时更新

自动补全:
yum -y install bash-completion echo "source <(kubectl completion bash)" >>
~/.bashrc
添加镜像仓库认证
kubectl -n $NAMESPACE create secret docker-registry $KEYNAME \
--docker-server=$DOCKER_REGISTRY_SERVER \ --docker-username=$DOCKER_USER \
--docker-password=$DOCKER_PASSWORD \ --docker-email=$DOCKER_EMAIL echo
"------------ create k8s-user secret ----------------" kubectl get secret
$KEYNAME --output="jsonpath={.data.\.dockerconfigjson}" | base64 -d echo
"------------ add k8s-user serviceaccount ----------------" kubectl -n
$NAMESPACE patch serviceaccount default -p '{"imagePullSecrets": [{"name":
"k8s-user"}]}'
获取集群内部service&pod网段
ps -ef | grep -Po 'cluster-cidr\S+\s|service-cluster-ip-range\S+\s'
获取集群/组件状态
kubectl get componentstatus kubectl cluster-info
获取kubelet状态
systemctl status kubelet journalctl -xefu kubelet
更新istio流量拦截网段
helm template install/kubernetes/helm/istio --set
global.proxy.includeIPRanges="10.1.0.0/16\,10.2.0.0/20" -x
templates/sidecar-injector-configmap.yaml | kubectl apply -f -
istio 开启自动注入
kubectl label namespace default istio-injection=enabled
istio替换现有deploy, 注入sidercar
istioctl kube-inject -f <(kubectl get deploy xxx -o yaml) | kubectl replace -f
-
重启pod(无法直接重启, 删除或者replace pod可以达到重启效果, 或者进入容器/cashbus/tomcat/restart.sh)
kubectl delete po -l app=sc-tag kubectl get pod logtail-ds-698m5 -n
kube-system -o yaml | kubectl replace --force -f -
转发pod流量到kubectl运行节点上
# kiali kubectl -n istio-system port-forward $(kubectl -n istio-system get pod
-l app=kiali -o jsonpath='{.items[0].metadata.name}') 20001:20001 # grafana
kubectl -n istio-system port-forward $(kubectl -n istio-system get pod -l
app=grafana -o jsonpath='{.items[0].metadata.name}') 3000:3000 & # prometheus
kubectl -n istio-system port-forward $(kubectl -n istio-system get pod -l
app=prometheus -o jsonpath='{.items[0].metadata.name}') 9090:9090 & # service
Graph kubectl -n istio-system port-forward $(kubectl -n istio-system get pod -l
app=servicegraph -o jsonpath='{.items[0].metadata.name}') 8088:8088 & #
jaeger-collector kubectl -n istio-system port-forward $(kubectl -n istio-system
get po -l app=tracing-on-sls,component=collector -o
jsonpath='{.items[0].metadata.name}') 9411:9411&
停止应用所有pod 没法直接停止 可以 scale对应deployment为0达到效果
kubectl scale xx sc-contract-sc-xxx --replicas=0
命令行处理yaml
cat <<EOF | kubectl create -f - apiVersion: extensions/v1beta1 kind: Ingress
metadata: name: simple annotations: nginx.ingress.kubernetes.io/rewrite-target:
/ spec: rules: - http: paths: - path: /svc backend: serviceName: http-svc
servicePort: 80 EOF
标记master可调度(不建议)
kubectl taint node -l node-role.kubernetes.io/master
node-role.kubernetes.io/master=:PreferNoSchedule --overwrite kubectl taint node
-l node-role.kubernetes.io/master node-role.kubernetes.io/master-
标记节点不可调度
kubectl cordon node
helm手动安装
######### helm install 需要支持ipv6 /etc/sysctl.conf
net.ipv6.conf.all.disable_ipv6 = 0 net.ipv6.conf.default.disable_ipv6 = 0
net.ipv6.conf.lo.disable_ipv6 = 0 $ sysctl -p /etc/sysconfig/network
NETWORKING_IPV6=yes $ service network restart curl
https://raw.githubusercontent.com/kubernetes/helm/master/scripts/get | bash
helm tiller自行升级 官方源被墙 国内连不上 这里用阿里镜像源
export TILLER_TAG=v2.9.1 kubectl --namespace=kube-system set image
deployments/tiller-deploy
tiller=registry-vpc.cn-beijing.aliyuncs.com/google_containers/tiller:$TILLER_TAG
helm 自动补全
source <(helm completion bash)
获取pod异常终止前的状态
kubectl get pod -o go-template='{{range.status.containerStatuses}}{{"Container
Name: "}}{{.name}}{{"\r\nLastState: "}}{{.lastState}}{{end}}' xxxxxxxx
删除node
转移节点正在运行的 resource kubectl get no -o wide | awk '/NotReady/{print $1}' | xargs
-i -t kubectl drain {} --ignore-daemonsets 删除 kubectl get no -o wide | awk
'/NotReady/{print $1}' | xargs -i -t kubectl delete node {}
逐出节点上所有pod
kubectl drain cn-beijing.i-xxxxx --delete-local-data --ignore-daemonsets
批量打ingress controller标签 用作自动调度
kubectl get node | awk '!/master/{print $1}' |xargs -i -t kubectl label node
{} node-role.kubernetes.io/ingress=true --overwrite
各种patch
patch configmap kubectl patch -n kube-system cm tcp-services --patch
'{"data":{"32218": "default/sc-xxx0debug:32219"}}' patch serice kubectl patch
-n kube-system svc nginx-ingress-lb --patch
'{"spec":{"ports":[{"name":"patch-test","port": 32222, "protocol":"TCP",
"targetPort": 32222}]}}' patch nodeSelector kubectl patch deployment
sc-demo-sc-demo -p
'{"spec":{"template":{"spec":{"nodeSelector":{"env":"testing"}}}}}' patch
readiness healthCheck jsonpatch http://jsonpatch.com/
patch healthCheck, JSON Patch, RFC 6902
kubectl patch deployment xxxx --type='json' -p='[ { "op": "replace", "path":
"/spec/template/spec/containers/0/readinessProbe", "value": {
"failureThreshold": 1, "initialDelaySeconds": 30, "periodSeconds": 3,
"successThreshold": 3, "httpGet": { "path": "/rest/healthCheck", "port":
"app-port" }, "timeoutSeconds": 1 } } ]'
获取所有运行镜像 go-template示例
kubectl get deployment -o go-template --template='{{range .items}}{{range
.spec.template.spec.containers }}{{printf "%s\n" .image}}{{end}}{{end}}'
kubectl get deployment -o go-template --template='{{range .items}}{{range
.spec.template.spec.containers }}{{printf "%s\n" .image}}{{end}}{{end}}' | awk
-F'[:/]' '{printf " [\042%s\042]=\042%s\042\n",$(NF-1),$NF}'
删除istio相关crd(customresourcedefinition)
kubectl get crd | awk '/istio/{print $1}' | xargs -i kubectl delete crd {}
清空整个namespace(慎用)
kubectl -n istio-system delete all --all
强制更新 helm "no deployed release"状态的release，感觉还是比较鸡肋. 至今没找到好的办法处理 "no deployed
release"
helm upgrade --force -i -f ack-istio-default.yaml ack-istio-default
incubator/ack-istio

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