{"id":38312,"date":"2019-10-31T22:22:55","date_gmt":"2019-10-31T19:22:55","guid":{"rendered":"https:\/\/prohoster.info\/blog\/prostoj-i-bezopasnyj-sposob-avtomatizatsii-kanareechnyh-deploev-s-pomoshhyu-helm\/"},"modified":"2019-10-31T22:22:55","modified_gmt":"2019-10-31T19:22:55","slug":"prostoj-i-bezopasnyj-sposob-avtomatizatsii-kanareechnyh-deploev-s-pomoshhyu-helm","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/administrirovanie\/prostoj-i-bezopasnyj-sposob-avtomatizatsii-kanareechnyh-deploev-s-pomoshhyu-helm","title":{"rendered":"Enkel og sikker m\u00e5de at automatisere kanariefugle-deploys med Helm","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\"Enkel
\n
\nKanarideployering er en meget effektiv metode til at teste ny kode p\u00e5 en delm\u00e6ngde af brugere. Det reducerer betydeligt den trafikbelastning, som kan for\u00e5rsage problemer under udrulningen, da det kun finder sted inden for en bestemt undergruppe. Denne note handler om, hvordan man organiserer en s\u00e5dan deployment ved hj\u00e6lp af Kubernetes og automatisering af deployment. Det antages, at du allerede ved noget om Helm og Kubernetes-ressourcer.<\/i>.
\n<\/a><\/noindex>
\n\"Enkel
\n
\nEn enkel kanarideployering i Kubernetes involverer to n\u00f8gle ressourcer: selve servicen og udrulningsv\u00e6rkt\u00f8jet. Kanarideployeringen fungerer gennem en tjeneste, der interagerer med to forskellige ressourcer, der h\u00e5ndterer opdateringstrafikken. En af disse ressourcer vil arbejde med den 'kanariefarvede' version, mens den anden vil arbejde med den stabile version. I denne situation kan vi regulere antallet af kanariefarvede versioner for at reducere den n\u00f8dvendige m\u00e6ngde trafik, der skal h\u00e5ndteres. Hvis du for eksempel foretr\u00e6kker at bruge Yaml, ser det s\u00e5dan ud i Kubernetes: <\/p>\n

kind: Deployment\nmetadata:\n  name: app-canary\n  labels:\n    app: app\nspec:\n  replicas: 1\n  ...\n    image: myapp:canary\n---\nkind: Deployment\nmetadata:\n  name: app\n  labels:\n    app: app\nspec:\n  replicas: 5\n  ...\n    image: myapp:stable\n---\nkind: Service\nselector:\n  app: app # Selector vil rute trafik til begge udrulninger.<\/code><\/pre>\n
\nEn endnu lettere m\u00e5de at forestille sig denne variant er via kubectl, mens i dokumentationen for Kubernetes<\/a><\/noindex> faktisk findes der en komplet tutorial til dette scenarie. Men det hovedsp\u00f8rgsm\u00e5l, som dette indl\u00e6g handler om, er, hvordan vi planl\u00e6gger at automatisere denne proces ved hj\u00e6lp af Helm. <\/p>\n
Automatisering af kanarideployering <\/h3>\n
\nF\u00f8rst og fremmest har vi brug for et Helm chart, som allerede indeholder de ressourcer, vi har diskuteret ovenfor. Det skal se nogenlunde s\u00e5dan ud:<\/p>\n
~\\\/charts\\\/app\n\u251c\u2500\u2500 Chart.yaml\n\u251c\u2500\u2500 README.md\n\u251c\u2500\u2500 templates\n\u2502   \u251c\u2500\u2500 NOTES.txt\n\u2502   \u251c\u2500\u2500 _helpers.tpl\n\u2502   \u251c\u2500\u2500 deployment.yaml\n\u2502   \u2514\u2500\u2500 service.yaml\n\u2514\u2500\u2500 values.yaml<\/code><\/pre>\n
\nKernen i Helm-koncepterne er h\u00e5ndtering af multi-versioner af releases. Den stabile version er vores prim\u00e6re stabile kodegren for projektet. Men ved hj\u00e6lp af Helm kan vi udrulle en kanarirelease med vores eksperimentelle kode. Det vigtigste er at bevare trafikudvekslingen mellem den stabile version og kanarireleasen. Alt dette vil vi styre med en s\u00e6rlig selector:<\/p>\n
selector:\n  app.kubernetes.io\\\/name: myapp<\/code><\/pre>\n
\nVores b\u00e5de \"kanariefugle\" og stabile deployments vil angive denne label p\u00e5 modulerne. Hvis alt er konfigureret korrekt, vil trafikken under deployment af den kanariefugle version af vores Helm chart blive dirigeret til de nyoprettede moduler. Den stabile version af denne kommando vil se s\u00e5dan ud: <\/p>\n
helm upgrade\n  --install myapp \n  --namespace default \n  --set app.name=myapp       # G\u00e5r ind i app.kubernetes.io\/name\n  --set app.version=v1       # G\u00e5r ind i app.kubernetes.io\/version\n  --set image.tag=stable \n  --set replicaCount=5<\/code><\/pre>\n
\nNu lad os tjekke vores kanariefugle release. For at deployere den kanariefugle version, skal vi huske to ting. Navnet p\u00e5 releasen skal adskille sig, s\u00e5 vi ikke overskriver den nuv\u00e6rende stabile version. Versionen og tagget skal ogs\u00e5 adskille sig, s\u00e5 vi kan deployere anden kode og identificere forskelle baseret p\u00e5 ressource-tags. <\/p>\n
helm upgrade\n  --install myapp-canary \n  --namespace default \n  --set app.name=myapp       # G\u00e5r ind i app.kubernetes.io\/name\n  --set app.version=v2       # G\u00e5r ind i app.kubernetes.io\/version\n  --set image.tag=canary \n  --set replicaCount=1<\/code><\/pre>\n
\nOg det er egentlig det! Hvis man pinger tjenesten, kan man se, at den kanariefugle opdatering kun dirigerer trafikken noget af tiden. <\/p>\n
\nHvis du leder efter automatiseringsv\u00e6rkt\u00f8jer til deployment, der inkluderer den beskrevne logik, s\u00e5 tjek Deliverybot<\/a><\/noindex> og p\u00e5 automatiseringsv\u00e6rkt\u00f8jer til Helm p\u00e5 GitHub<\/a><\/noindex>. Helm charts, der anvendes til implementeringen af den beskrevne metode, ligger p\u00e5 GitHub, her<\/a><\/noindex>. Generelt var dette en teoretisk gennemgang af, hvordan man praktisk implementerer automatisering af kanariefugle deployments med specifikke koncepter og eksempler.
\n
Kilde: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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\u0434\u0435\u043f\u043b\u043e\u044f. \u041f\u0440\u0435\u0434\u043f\u043e\u043b\u0430\u0433\u0430\u0435\u0442\u0441\u044f, \u0447\u0442\u043e \u0432\u044b \u043a\u043e\u0435-\u0447\u0442\u043e \u0437\u043d\u0430\u0435\u0442\u0435 \u043e Helm \u0438 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":28760,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-38312","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47En enkel og sikker metode til at automatisere kanariefugle deployments med Helm | 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