{"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\/pt\/blog\/administrirovanie\/prostoj-i-bezopasnyj-sposob-avtomatizatsii-kanareechnyh-deploev-s-pomoshhyu-helm","title":{"rendered":"Uma maneira simples e segura de automatizar implanta\u00e7\u00f5es can\u00e1rias usando Helm","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\"Uma
\n
\nA implanta\u00e7\u00e3o can\u00e1ria \u00e9 uma maneira muito eficaz de testar novo c\u00f3digo em um subconjunto de usu\u00e1rios. Ela reduz significativamente a carga de tr\u00e1fego, que poderia causar problemas durante a implanta\u00e7\u00e3o, j\u00e1 que ocorre apenas dentro de um grupo espec\u00edfico. Esta nota se dedica a como organizar tal implanta\u00e7\u00e3o usando ferramentas do Kubernetes e automa\u00e7\u00e3o de implanta\u00e7\u00f5es. Suponha que voc\u00ea saiba um pouco sobre Helm e recursos do Kubernetes<\/i>.
\n<\/a><\/noindex>
\n\"Uma
\n
\nUma implanta\u00e7\u00e3o can\u00e1ria simples no Kubernetes envolve dois recursos principais: o pr\u00f3prio servi\u00e7o e a ferramenta de implanta\u00e7\u00e3o. A implanta\u00e7\u00e3o can\u00e1ria funciona atrav\u00e9s de um servi\u00e7o que interage com dois recursos diferentes, gerenciando o tr\u00e1fego de atualiza\u00e7\u00e3o. Um desses recursos ir\u00e1 operar com a vers\u00e3o 'can\u00e1ria', enquanto o outro com a vers\u00e3o est\u00e1vel. Nesse cen\u00e1rio, podemos ajustar a quantidade de vers\u00f5es can\u00e1rias para reduzir o tr\u00e1fego necess\u00e1rio. Por exemplo, se voc\u00ea preferir usar Yaml, isso seria configurado no Kubernetes da seguinte forma: <\/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 # O seletor vai direcionar o tr\u00e1fego para ambas as implanta\u00e7\u00f5es.<\/code><\/pre>\n
\nUma maneira ainda mais simples de visualizar isso \u00e9 usando kubectl, e na documenta\u00e7\u00e3o do Kubernetes<\/a><\/noindex> h\u00e1 at\u00e9 um tutorial completo sobre esse cen\u00e1rio. Mas a quest\u00e3o principal deste post \u00e9 como vamos automatizar esse processo usando Helm. <\/p>\n
Automa\u00e7\u00e3o da implanta\u00e7\u00e3o can\u00e1ria <\/h3>\n
\nPrimeiro, precisaremos de um mapa dos gr\u00e1ficos do Helm, que j\u00e1 inclui os recursos discutidos acima. Ele deve ter a seguinte apar\u00eancia:<\/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
\nA base do conceito do Helm \u00e9 a gest\u00e3o de vers\u00f5es m\u00faltiplas de releases. A vers\u00e3o est\u00e1vel \u00e9 nosso ramo principal de c\u00f3digo est\u00e1vel do projeto. Mas, com o Helm, podemos implantar uma vers\u00e3o can\u00e1ria com nosso c\u00f3digo experimental. O importante \u00e9 manter a troca de tr\u00e1fego entre a vers\u00e3o est\u00e1vel e a vers\u00e3o can\u00e1ria. Vamos gerenciar tudo isso com um seletor especial:<\/p>\n
selector:\n  app.kubernetes.io\\\/name: myapp<\/code><\/pre>\n
\nNossos recursos de deployment, tanto os 'can\u00e1rio' quanto os est\u00e1veis, indicar\u00e3o esse r\u00f3tulo nos m\u00f3dulos. Se tudo estiver configurado corretamente, durante o deployment da vers\u00e3o can\u00e1ria do nosso gr\u00e1fico Helm, veremos que o tr\u00e1fego ser\u00e1 direcionado para os m\u00f3dulos rec\u00e9m-implantados. A vers\u00e3o est\u00e1vel deste comando ser\u00e1 assim: <\/p>\n
helm upgrade\n  --install myapp \n  --namespace default \n  --set app.name=myapp       # Vai para app.kubernetes.io\/name\n  --set app.version=v1       # Vai para app.kubernetes.io\/version\n  --set image.tag=stable \n  --set replicaCount=5<\/code><\/pre>\n
\nAgora vamos verificar nosso release can\u00e1rio. Para fazer o deployment da vers\u00e3o can\u00e1ria, precisamos ter em mente duas coisas. O nome do release deve ser diferente, para que n\u00e3o fa\u00e7amos uma atualiza\u00e7\u00e3o na vers\u00e3o est\u00e1vel atual. A vers\u00e3o e a tag tamb\u00e9m devem ser diferentes, para que possamos implantar um c\u00f3digo distinto e identificar as diferen\u00e7as pelos r\u00f3tulos dos recursos. <\/p>\n
helm upgrade\n  --install myapp-canary \n  --namespace default \n  --set app.name=myapp       # Vai para app.kubernetes.io\/name\n  --set app.version=v2       # Vai para app.kubernetes.io\/version\n  --set image.tag=canary \n  --set replicaCount=1<\/code><\/pre>\n
\n\u00c9 isso! Se voc\u00ea pingar o servi\u00e7o, ver\u00e1 que a atualiza\u00e7\u00e3o can\u00e1ria direciona o tr\u00e1fego apenas parte do tempo. <\/p>\n
\nSe voc\u00ea est\u00e1 procurando ferramentas de automa\u00e7\u00e3o de deployment que incluam a l\u00f3gica descrita, considere Deliverybot<\/a><\/noindex> e no ferramentas de automa\u00e7\u00e3o Helm no GitHub<\/a><\/noindex>. Os gr\u00e1ficos Helm usados para implementar o m\u00e9todo descrito acima est\u00e3o no Github, aqui<\/a><\/noindex>. Na verdade, este foi um panorama te\u00f3rico de como implementar a automa\u00e7\u00e3o do deployment de vers\u00f5es can\u00e1rias na pr\u00e1tica, com conceitos e exemplos concretos.
\n
Fonte: 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\udd47Uma maneira simples e segura de automatizar deployments can\u00e1rios com Helm | 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