Vikube: Operate Kubernetes in Vim

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VIKUBE VIM & KUBERNETES OPERTATION

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VIKUBE @C9S ▸ Started open source development from the Perl community since 2007 ▸ Maintained over 50 modules on CPAN. The largest Perl module platform. ▸ Found over 200 projects on GitHub from C, VimL, Perl, JavaScript, TypeScript and PHP. ▸ Contributed code to Facebook HHVM, PHP Zend Engine and the Google Go project.

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VIKUBE @C9S & KUBERNETRES ▸ Started using Kubernetes for the deep learning training platform since last year (Mid 2017) ▸ As a Developer, we heavily use Kubernetes API for integrating the applications. ▸ As a DevOps, we integrate CI/CD with Kubernetes, and use Vikube for debugging the Kubernetes deployments.

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KUBERNETES 5 MINUTES

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KUBERNETES ARCHITECTUR E REVIEW

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Minion kubelet Pod Container Master API Server Replication Controller Scheduler Pod Container Minion kubelet Pod Container Pod Container Minion kubelet Pod Container Pod Container

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KUBERNETES RESOURCE REVIEW

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5 MINUTES KUBERNETES POD ▸ A pod (as in a pod of whales or pea pod) is a group of one or more containers (such as Docker containers) ▸ with shared storage/network, ▸ and a speciﬁcation for how to run the containers.

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5 MINUTES KUBERNETES REPLICATION CONTROLLER ▸ A ReplicationController ensures that a speciﬁed number of pod replicas are running at any one time. In other words, a ReplicationController makes sure that a pod or a homogeneous set of pods is always up and available.with shared storage/network,

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5 MINUTES KUBERNETES REPLICASET ▸ ReplicaSet is the next-generation Replication Controller. The only difference between a ReplicaSet and a Replication Controller right now is the selector support. ▸ Difference: ReplicaSet supports the new set-based selector requirements whereas a Replication Controller only supports equality-based selector requirements.

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5 MINUTES KUBERNETES DEPLOYMENT ▸ A Deployment controller provides declarative updates for Pods and ReplicaSets. ▸ You describe a desired state in a Deployment object, and the Deployment controller changes the actual state to the desired state at a controlled rate. ▸ You can deﬁne Deployments to create new ReplicaSets, or to remove existing Deployments and adopt all their resources with new Deployments.

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OPERATION DEBUGGING KUBERNETES

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VIKUBE KUBERNETES VERBS ▸ kubectl create ▸ kubectl delete ▸ kubectl get ▸ kubectl edit ▸ kubectl replace ▸ kubectl patch

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kubectl get pods 取得現在在預設名稱空間中正在運⾏行行的 Pods CHECK PODS

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kubectl get pvc 檢查現在可使⽤用的 Persistent Volume Claim CHECK PERSISTENT VOLUME CLAIM

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kubectl get pods -o wide 取得現在正在運⾏行行的 Pods 以及其 IP 與正在運⾏行行的 Node CHECK PODS WITH IP AND NODES

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kubectl get pods -o wide \ --all-namespaces 取得現在所有名稱空間中正在運⾏行行的 Pods 以及其 IP 與正在運⾏行行的 Node CHECK PODS FROM ALL NAMESPACES

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kubectl get pods -w 監測 Pods 動態 WATCH PODS

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kubectl logs -c webapp -f nginx-xxx 調閱 Container 紀錄 TAIL CONTAINER LOG

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kubectl exec -it nginx-xxx /bin/sh 在⽬目前正在運⾏行行中的 Container 中執⾏行行命令 EXECUTE COMMAND IN THE CONTAINER

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CRASHLOOPBACKOFF!

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VIKUBE SOP FOR FIXING CRASHLOOPBACKOFF ▸ Check the logs of the containers in the pod ▸ Describe the pod ▸ Check if the volume is available? ▸ Check the events of the pod ▸ Check the availability of the image ▸ Exec into the container and try to reproduce the problem ▸ Check the authentication to the image repository (usually happens to the images on ECS or GCR)

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VIKUBE TIME WASTED ▸ Copy the target pod name ▸ Enter the describe command and paste the pod name ▸ Enter the logs command and paste the pod name ▸ Enter the exec command and paste the pod name ▸ Get the events and then use the pod name to grep ▸ Or, get the related deployment, statefulset ...

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VIKUBE SOLUTIONS TO THESE REPEATED COMMANDS ▸ kube-shell ▸ kube-prompt ▸ kubesh

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All of them requires you to type subcommands

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I have Vim

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I have Kubernetes

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WHAT'S VIKUBE?

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USE VIM AS THE USER INTERFACE

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vim -c ":Vikube" All you need is VIM ENTERING VIKUBE

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Live Demo

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WHY USE VIM?

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跨平台

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可遠端執⾏

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超快

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超⽅便

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Why can't you Get out of vim?

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Why Is It So Hard?

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嚇你的

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HOW DOES IT WORK?

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VIKUBE VIEWPORTS AND BUFFERS

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VIKUBE TAB VIEWPORTS AND BUFFERS

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LEARN VIM IN 5 MINUTES

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Scope

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b: g: s: w: t: Buﬀer Scope Global Scope Script Scope Window Scope Tab Scope

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b: g: s: w: t: let foo = 1 let let let let foo = 1 foo = 1 foo = 1 foo = 1

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Function

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function! Add(x, y) return a:x + a:y endfunction let y = Add(1,2)

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function! Foo() let x = 0 function! Bar() closure let x += 1 return x endfunction return funcref('Bar') endfunction let F = Foo() echo F()

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:function {arguments} {name} ( ) range abort closure dict :endfunction When the [abort] argument is added, the function will abort as soon as an error is detected. When the [closure] argument is added, the function can access variables and arguments from the outer scope. This is usually called a closure. When the [dict] argument is added, the function must be invoked through an entry in a |Dictionary|. The local variable "self" will then be set to the dictionary. When the [closure] argument is added, the function can access variables and arguments from the outer scope.

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Command

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:w :q :buffers :split :vsplit

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-buffer -range command! {name} {command} -range=% -range=N -bar -count=N -bang -register The first arguments to the command can be an optional register name The command will only be available in the current buffer {options} Range allowed, the default is the current line Range allowed, the default is the whole file A default N which is specified in the line number position A count (default N) which is specified either in the line number position, or as an initial argument The command can be followed by a "|" and another command. A "|" inside the command argument is not allowed then. The command can take a ! modifier (like :q or :w)

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Define The Source

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fun! s:source() let cmd = s:cmdbase() let cmd = cmd . " get " . b:resource_type if b:wide let cmd = cmd . " -o wide" endif if b:all_namespace let cmd = cmd . " --all-namespaces" endif if b:show_all let cmd = cmd . " --show-all" endif redraw | echomsg cmd return system(cmd . "| awk 'NR == 1; NR > 1 {print $0 | \"sort -b -k1\"}'") endf

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Render The Screen

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:tabnew

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:setlocal noswapfile nonumber :setlocal nobuflisted buftype=nofile bufhidden=wipe

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:setlocal updatetime=2000

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cal s:render() Script Scope

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fun! s:render() let save_cursor = getcurpos() if b:source_changed || !exists('b:source_cache') let b:source_cache = s:source() let b:source_changed = 0 endif setlocal modifiable " clear the buffer redraw normal ggdG " draw the result redraw put=out " remove the first empty line redraw normal ggdd endf Data Source Clear the screen and redraw Render the screen Unlock buffer