2019 年 9 月手记

Kubernetes

kubernetes 生产环境性能优化

https://caicloud.io/blog/57392eca8241681100000003

容器内信息注入

https://kubernetes.io/docs/concepts/storage/volumes/#using-subpath-with-expanded-environment-variables

https://kubernetes.io/docs/tasks/inject-data-application/downward-api-volume-expose-pod-information/#capabilities-of-the-downward-api

kubernetes scheduler

https://ggaaooppeenngg.github.io/zh-CN/2017/09/26/kubernetes-%E6%8C%87%E5%8C%97/

https://caicloud.io/blog/57392eca8241681100000003

https://coreos.com/blog/improving-kubernetes-scheduler-performance.html

kubernetes cpu manager

https://github.com/kubernetes/kubernetes/issues/67577

https://kubernetes.io/blog/2018/07/24/feature-highlight-cpu-manager/

https://cloud.tencent.com/developer/article/1402119

https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=de53fd7aedb100f03e5d2231cfce0e4993282425

https://bugzilla.kernel.org/show_bug.cgi?id=198197

https://gist.github.com/bobrik/2030ff040fad360327a5fab7a09c4ff1

https://github.com/kubernetes/community/blob/master/contributors/design-proposals/node/cpu-manager.md

https://www.slideshare.net/try_except_/ensuring-kubernetes-cost-efficiency-across-many-clusters-devops-gathering-2019

https://github.com/kubernetes/kubernetes/issues/66614

https://github.com/opencontainers/runc/issues/1635

https://twitter.com/try_except_/status/1131459031376252928

https://www.slideshare.net/try_except_/ensuring-kubernetes-cost-efficiency-across-many-clusters-devops-gathering-2019

debug kubernetes service

排查 kubernetes service 问题的步骤：

https://kubernetes.io/docs/tasks/debug-application-cluster/debug-service/#does-the-service-work-by-ip

关于容器内 sysctl 的问题

https://github.com/kubernetes/community/blob/master/contributors/design-proposals/node/sysctl.md

https://github.com/kubernetes/kubernetes/issues/29572#issuecomment-236193826

https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt

https://kubernetes.io/docs/tasks/configure-pod-container/security-context/

https://github.com/moby/moby/issues/4611

https://github.com/moby/moby/issues/35993

docker

镜像 sha256 地址

根据镜像的 id 获取 sha256 地址：

docker image inspect --format='{{index .RepoDigests 0}}' ${IMAGE}

根据镜像的 sha256 地址拉取镜像：

docker pull ubuntu@sha256:45b23dee08af5e43a7fea6c4cf9c25ccf269ee113168c19722f87876677c5cb2

Linux

exit code 和 signal 的对应关系

signal = exit code - 128 

kill -l

 1) SIGHUP       2) SIGINT       3) SIGQUIT      4) SIGILL
 5) SIGTRAP      6) SIGABRT      7) SIGEMT       8) SIGFPE
 9) SIGKILL     10) SIGBUS      11) SIGSEGV     12) SIGSYS
13) SIGPIPE     14) SIGALRM     15) SIGTERM     16) SIGUSR1
17) SIGUSR2     18) SIGCHLD     19) SIGPWR      20) SIGWINCH
21) SIGURG      22) SIGIO       23) SIGSTOP     24) SIGTSTP
25) SIGCONT     26) SIGTTIN     27) SIGTTOU     28) SIGVTALRM
29) SIGPROF     30) SIGXCPU     31) SIGXFSZ     32) SIGWAITING
33) SIGLWP      34) SIGFREEZE   35) SIGTHAW     36) SIGCANCEL
37) SIGLOST     38) SIGXRES     41) SIGRTMIN    42) SIGRTMIN+1
43) SIGRTMIN+2  44) SIGRTMIN+3  45) SIGRTMAX-3  46) SIGRTMAX-2
47) SIGRTMAX-1  48) SIGRTMAX

https://stackoverflow.com/questions/23098695/strange-return-value-134-to-call-gawk-in-bash-script

更详细的关于 linux exit code 的介绍：

http://www.tldp.org/LDP/abs/html/exitcodes.html

shell 学习

https://github.com/jlevy/the-art-of-command-line/blob/master/README-zh.md

https://explainshell.com/

https://github.com/dylanaraps/pure-sh-bible

Advanced Bash-Scripting Guide

https://www.tldp.org/LDP/abs/html/index.html

Golang

一个用 golang 实现的执行 cron 定时任务的库

https://github.com/robfig/cron

Testing Your (HTTP) Handlers in Go

https://blog.questionable.services/article/testing-http-handlers-go/