{"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\/cs\/blog\/administrirovanie\/prostoj-i-bezopasnyj-sposob-avtomatizatsii-kanareechnyh-deploev-s-pomoshhyu-helm","title":{"rendered":"Jednoduch\u00fd a bezpe\u010dn\u00fd zp\u016fsob automatizace kan\u00e1rkov\u00fdch nasazen\u00ed pomoc\u00ed Helm","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\"Jednoduch\u00fd
\n
\nCanary deployment je velmi efektivn\u00ed zp\u016fsob testov\u00e1n\u00ed nov\u00e9ho k\u00f3du na ur\u010dit\u00e9 podskupin\u011b u\u017eivatel\u016f. V\u00fdrazn\u011b sni\u017euje zat\u00ed\u017een\u00ed provozu, kter\u00e9 m\u016f\u017ee v\u00e9st k probl\u00e9m\u016fm b\u011bhem nasazen\u00ed, proto\u017ee prob\u00edh\u00e1 pouze v r\u00e1mci vybran\u00e9 podskupiny. Tento \u010dl\u00e1nek je v\u011bnov\u00e1n tomu, jak organizovat takov\u00e9 nasazen\u00ed pomoc\u00ed Kubernetes a automatizace nasazen\u00ed. P\u0159edpokl\u00e1d\u00e1 se, \u017ee v\u00edte n\u011bco o Helmu a zdroj\u00edch Kubernetes.<\/i>.
\n<\/a><\/noindex>
\n\"Jednoduch\u00fd
\n
\nJednoduch\u00e9 kan\u00e1rkov\u00e9 nasazen\u00ed v Kubernetes zahrnuje dva kl\u00ed\u010dov\u00e9 zdroje: samotnou slu\u017ebu a n\u00e1stroj pro nasazen\u00ed. Kan\u00e1rkov\u00e1 nasazen\u00ed funguj\u00ed prost\u0159ednictv\u00edm jedn\u00e9 slu\u017eby, kter\u00e1 interaguje s dv\u011bma r\u016fzn\u00fdmi zdroji obsluhuj\u00edc\u00edmi provoz aktualizace. Jeden z t\u011bchto zdroj\u016f bude pracovat s \u201ekan\u00e1rkovou\u201c verz\u00ed a druh\u00fd se stabiln\u00ed. V t\u00e9to situaci m\u016f\u017eeme regulovat po\u010det kan\u00e1rkov\u00fdch verz\u00ed, abychom sn\u00ed\u017eili objem pot\u0159ebn\u00e9ho provozu k obsluze. Pokud nap\u0159\u00edklad d\u00e1v\u00e1te p\u0159ednost pou\u017eit\u00ed Yaml, vypadalo by to v Kubernetes takto: <\/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 nasm\u011bruje provoz na ob\u011b nasazen\u00ed.<\/code><\/pre>\n
\nJe\u0161t\u011b jednodu\u0161eji si takovou variantu m\u016f\u017eeme p\u0159edstavit na kubectl, a v dokumentaci k Kubernetes<\/a><\/noindex> dokonce existuje \u00fapln\u00fd tutori\u00e1l k tomuto sc\u00e9n\u00e1\u0159i. Ale hlavn\u00ed ot\u00e1zka tohoto p\u0159\u00edsp\u011bvku je, jak hodl\u00e1me automatizovat tento proces pomoc\u00ed Helmu. <\/p>\n
Automatizace kan\u00e1rkov\u00e9ho nasazen\u00ed <\/h3>\n
\nNejprve budeme pot\u0159ebovat Helm chart, do kter\u00e9ho ji\u017e byly zahrnuty v\u00fd\u0161e uveden\u00e9 zdroje. M\u011bl by vypadat p\u0159ibli\u017en\u011b takto:<\/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
\nZ\u00e1kladn\u00ed koncept Helmu spo\u010d\u00edv\u00e1 v \u0159\u00edzen\u00ed v\u00edcero verz\u00ed vyd\u00e1n\u00ed. Stabiln\u00ed verze je na\u0161e hlavn\u00ed stabiln\u00ed v\u011btev k\u00f3du projektu. Ale pomoc\u00ed Helmu m\u016f\u017eeme nasadit kan\u00e1rkovou verzi s na\u0161\u00edm experiment\u00e1ln\u00edm k\u00f3dem. D\u016fle\u017eit\u00e9 je udr\u017eet v\u00fdm\u011bnu provozu mezi stabiln\u00ed verz\u00ed a kan\u00e1rkovou verz\u00ed. \u0158\u00eddit to budeme pomoc\u00ed speci\u00e1ln\u00edho selektoru:<\/p>\n
selector:\n  app.kubernetes.io\\\/name: myapp<\/code><\/pre>\n
\nNa\u0161e jak \"kan\u00e1rkov\u00e9\", tak i stable zdroje nasazen\u00ed budou ozna\u010dovat tuto zna\u010dku na modulech. Pokud v\u0161e spr\u00e1vn\u011b nastav\u00edme, uvid\u00edme b\u011bhem nasazen\u00ed kan\u00e1rkov\u00e9 verze na\u0161\u00ed Helm chart, \u017ee provoz bude sm\u011brov\u00e1n na \u010derstv\u011b nasazen\u00e9 moduly. Stabiln\u00ed verze tohoto p\u0159\u00edkazu bude vypadat takto: <\/p>\n
helm upgrade\n  --install myapp \n  --namespace default \n  --set app.name=myapp       # P\u0159ejde do app.kubernetes.io\/name\n  --set app.version=v1       # P\u0159ejde do app.kubernetes.io\/version\n  --set image.tag=stable \n  --set replicaCount=5<\/code><\/pre>\n
\nNyn\u00ed si zkontrolujme na\u0161e kan\u00e1rkov\u00e9 vyd\u00e1n\u00ed. Abychom nasadili kan\u00e1rkovou verzi, mus\u00edme m\u00edt na pam\u011bti dv\u011b v\u011bci. N\u00e1zev vyd\u00e1n\u00ed mus\u00ed b\u00fdt odli\u0161n\u00fd, abychom neaplikovali aktualizaci na aktu\u00e1ln\u00ed stable verzi. Verze a tag tak\u00e9 mus\u00ed b\u00fdt r\u016fzn\u00e9, abychom mohli nasadit jin\u00fd k\u00f3d a ur\u010dit rozd\u00edly podle zna\u010dek zdroj\u016f. <\/p>\n
helm upgrade\n  --install myapp-canary \n  --namespace default \n  --set app.name=myapp       # P\u0159ejde do app.kubernetes.io\/name\n  --set app.version=v2       # P\u0159ejde do app.kubernetes.io\/version\n  --set image.tag=canary \n  --set replicaCount=1<\/code><\/pre>\n
\nA to je vlastn\u011b v\u0161echno! Pokud pingneme slu\u017ebu, m\u016f\u017eeme vid\u011bt, \u017ee kan\u00e1rkov\u00e1 aktualizace sm\u011bruje provoz jen \u010d\u00e1st \u010dasu. <\/p>\n
\nPokud hled\u00e1te n\u00e1stroje pro automatizaci nasazen\u00ed, kter\u00e9 zahrnuj\u00ed popsanou logiku, pak se pod\u00edvejte na Deliverybot<\/a><\/noindex> a na n\u00e1stroje automatizace Helm na GitHubu<\/a><\/noindex>. Helm chart, pou\u017e\u00edvan\u00e9 pro implementaci v\u00fd\u0161e popsan\u00e9ho zp\u016fsobu, le\u017e\u00ed na GitHubu, tady<\/a><\/noindex>. Celkov\u011b \u0161lo o teoretick\u00fd p\u0159ehled toho, jak implementovat automatizaci nasazen\u00ed kan\u00e1rkov\u00fdch verz\u00ed v praxi, se specifick\u00fdmi koncepty a p\u0159\u00edklady.
\n
Zdroj: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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