jpuyy的网志

Author: jpuyy

  • kubernetes笔记

    最好不要越过 RC 直接创建 Pod, 通过 RC 管理 Pod，实现自动创建、补足、替换、删除 Pod，减少由于节点崩溃等意外造成的损失。

  • kubectl 操作记录

    设置 master

    kubectl label node node-master.foo.bar kubernetes.io/role=master
node "node-master.foo.bar" labeled

    查看集群组件信息

    kubectl get cs

    查看集群的 master api 地址

    kubectl cluster-info
kubectl cluster-info dump

    查看集群的各种资源类型

    kubectl api-resources | grep  istio
    kubectl get pods --namespace=kube-system

    强制删除 pod

    kubectl delete pod nginx-1849696770-2pk8t -n myspace --grace-period=0 --force

    转发一个端口

    kubectl -n monitoring port-forward deployment/getup-grafana 3000:3000
kubectl -n monitoring port-forward alertmanager-getup-prometheus-operator-alertmanager-0 9093:9093
kubectl -n monitoring port-forward prometheus-getup-prometheus-operator-prometheus-0 9090:9090

    exec 执行长命令被截断，需要用 —

    kubectl exec $POD_NAME tail -n 10 /var/log/newrelic_agent.log
Error from server (NotFound): namespaces "10" not found
应该用
kubectl exec $POD_NAME -- tail -n 10 /var/log/newrelic_agent.log
或
kubectl exec $POD_NAME -- bash -c "tail -n 10 /var/log/newrelic_agent.log"

    查看所有事件

    kubectl get events

    kubectl -n istio-system port-forward prometheus-6cabcdab97-mwptl 18080:9090
kubectl -n istio-system port-forward grafana-fabcd765b-vtcxp 18080:3000
kubectl -n istio-system port-forward kiali-8babb947c-b5g5m 18080:20001

    kubectl api-resources

    app=account_service
kubectl logs --tail 10 -f -l app=$app -n default -c $app

    kubectl get secret config1 -o json | jq '.data | map_values(@base64d)'

    kubectl get all -n jenkins

NAME                         READY   STATUS    RESTARTS   AGE
pod/jenkins-8d6cc58f-dnfv6   1/1     Running   0          3d5h

NAME                           TYPE           CLUSTER-IP     EXTERNAL-IP    PORT(S)           AGE
service/jenkins                ClusterIP      10.31.30.9             80/TCP            544d
service/jenkins-agent          LoadBalancer   10.31.25.64   172.170.0.41    50000:21700/TCP   544d
service/jenkins-agent-public   LoadBalancer   10.31.25.94   xx.xx.xx.xxx   50000:22289/TCP   402d

NAME                      READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/jenkins   1/1     1            1           544d

NAME                                 DESIRED   CURRENT   READY   AGE
replicaset.apps/jenkins-7f57bfbd76   0         0         0       544d
replicaset.apps/jenkins-8d6cc58f     1         1         1       367d

    查看 pod 的名字

    for pod in `kubectl get pods -n dev -o jsonpath={.items..metadata.name} `; do kubectl get pod $pod -n dev ; done

    查看 svc 的 ip

    kubectx | grep gke_ | while read line; do echo $line; kubectl --context $line get svc istio-ingressgateway -n istio-system -o jsonpath='{.status.loadBalancer.ingress[0].ip}'; echo; done

    查看 image 和 containerID

    kubectl get pods -n dev -o jsonpath='{range .items[*].status.containerStatuses[*]}{.image}{"\n"}{.containerID}{"\n\n"}{end}'

    用 go template

    kubectl get nodes -l cloud.google.com/machine-family=n1 -o go-template='{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}'

  • mitmproxy 抓包分析

    mitm.it

    https://mitmproxy.org/

  • glusterfs

    gluster volume info

  • jmap heap dump

    HOW TO CAPTURE HEAP DUMP? – JMAP, – XX:+HEAPDUMPONOUTOFMEMORYERROR

    JHAT – HEAP DUMP ANALYSIS

    切换到跑 java 进程所用的用户

    
[[email protected] etl] $ jmap -dump:live,file=/tmp/kafka_hdfs_1_minute.bin pid
[[email protected] etl] $ jmap -dump:live,file=/tmp/kafka_hdfs_15_minute.bin pid

    类似的工具还有 jps, jstack, jmap, etc.

  • vim + ctags

    用 vim 写 python golang javascript 都需要跳转

    brew install ctags

    查看 ctags 支持的版本

    ctags --list-languages

    cat ~/.ctags

    --langdef=Go
--langmap=Go:.go
--regex-Go=/func([ \t]+\([^)]+\))?[ \t]+([a-zA-Z0-9_]+)/\2/d,func/
--regex-Go=/var[ \t]+([a-zA-Z_][a-zA-Z0-9_]+)/\1/d,var/
--regex-Go=/type[ \t]+([a-zA-Z_][a-zA-Z0-9_]+)/\1/d,type/
--exclude=vendor

--exclude=build
--exclude=node_modules
--exclude=dist
--exclude=venv
--exclude=*.sql

--langdef=less
--langmap=less:.less
--regex-less=/^[ t]*.([A-Za-z0-9_-]+)/1/c,class,classes/
--regex-less=/^[ t]*#([A-Za-z0-9_-]+)/1/i,id,ids/
--regex-less=/^[ t]*(([A-Za-z0-9_-]+[ tn,]+)+){/1/t,tag,tags/
--regex-less=/^[ t]*@medias+([A-Za-z0-9_-]+)/1/m,media,medias/

--langdef=js
--langmap=js:.js.vue
--regex-js=/(,|(;|^)[ \t]*(var|let|([A-Za-z_$][A-Za-z0-9_$.]+\.)*))[ \t]*([A-Za-z0-9_$]+)[ \t]*=[ \t]*\{/\5/,object/
--regex-js=/(,|(;|^)[ \t]*(var|let|([A-Za-z_$][A-Za-z0-9_$.]+\.)*))[ \t]*([A-Za-z0-9_$]+)[ \t]*(=|:)[ \t]*function[ \t]*\(/\5/,function/
--regex-js=/(,|(;|^)[ \t]*(var|let|([A-Za-z_$][A-Za-z0-9_$.]+\.)*))[ \t]*([A-Za-z0-9_$]+)[ \t]*=[ \t]*\[/\5/,array/
--regex-js=/(,|(;|^)[ \t]*(var|let|([A-Za-z_$][A-Za-z0-9_$.]+\.)*))[ \t]*([A-Za-z0-9_$]+)[ \t]*=[ \t]*[^"]'[^']*/\5/,string/
--regex-js=/(,|(;|^)[ \t]*(var|let|([A-Za-z_$][A-Za-z0-9_$.]+\.)*))[ \t]*([A-Za-z0-9_$]+)[ \t]*=[ \t]*(true|false)/\5/,boolean/
--regex-js=/(,|(;|^)[ \t]*(var|let|([A-Za-z_$][A-Za-z0-9_$.]+\.)*))[ \t]*([A-Za-z0-9_$]+)[ \t]*=[ \t]*[0-9]+/\5/,number/
--regex-js=/(,|(;|^)[ \t]*(var|let|([A-Za-z_$][A-Za-z0-9_$.]+\.)*))[ \t]*([A-Za-z0-9_$]+)[ \t]*=[ \t]*.+([,;=]|$)/\5/,variable/
--regex-js=/(gulp\.task)/\1/,task/