{"id":3863,"date":"2018-10-30T17:15:42","date_gmt":"2018-10-30T15:15:42","guid":{"rendered":"https:\/\/www.systemcodegeeks.com\/?p=3863"},"modified":"2018-10-30T11:28:32","modified_gmt":"2018-10-30T09:28:32","slug":"helm-chart-deploy-scale-app-image","status":"publish","type":"post","link":"https:\/\/www.systemcodegeeks.com\/devops\/helm-chart-deploy-scale-app-image\/","title":{"rendered":"Helm chart to deploy and scale a generic app image"},"content":{"rendered":"

This is a post about a simple\u00a0helm chart<\/a> that I have worked on to deploy any generic app image to Kubernetes. The chart is available [here<\/a>]<\/p>\n

It tries to solve the issue of having to manage a set of raw Kubernetes resources(deployment<\/a>,secrets<\/a>,hpa<\/a>) and instead letting helm manage these resources. The chart is generic enough that it should be able to handle most\u00a012-factor compliant<\/a> app images.<\/p>\n

Consider a simple app that I have\u00a0here<\/a> – https:\/\/github.com\/bijukunjummen\/sample-boot-knative, an image for this application is publicly available on dockerhub – https:\/\/hub.docker.com\/r\/bijukunjummen\/sample-boot-knative-app\/<\/p>\n

If I wanted to deploy this app in a Kubernetes cluster, a set of specs to create a Kubernetes Deployment and a service is available\u00a0here<\/a> – https:\/\/github.com\/bijukunjummen\/sample-boot-knative\/tree\/master\/kube. This is a simple enough deployment, however, the specs can get complicated once configuration, secrets are layered in and if features like Horizontal scaling is required.<\/p>\n

Usage<\/h2>\n

There is a good documentation in the\u00a0README<\/a> of the chart, I will be mostly repeating that information here. I have hosted a version of the chart as a\u00a0chart repository<\/a> using\u00a0github-pages<\/a>, the first step to using the chart is to add this repo to your list of helm repos:<\/p>\n

helm repo add bk-charts http:\/\/bijukunjummen.github.io\/generic-app-chart\r\nhelm repo update<\/pre>\n
The chart should now show up if searched for:<\/p>\n
helm search generic-app-chart<\/pre>\n
The chart requires the details of the application that is being deployed, which can be provided as a yaml the following way:<\/p>\n
app:\r\n  healthCheckPath: \/actuator\/info\r\n  environment:\r\n    SERVER_PORT: \"8080\"\r\n    ENV_NAME: ENV_VALUE\r\n  secrets:\r\n    SECRET1: SECRET_VALUE1\r\n  autoscaling:\r\n    enabled: true\r\n    maxReplicas: 2\r\n    minReplicas: 1\r\n    targetCPUUtilizationPercentage: 40    \r\n\r\nimage:\r\n  repository: bijukunjummen\/sample-boot-knative-app\r\n  tag: 0.0.3-SNAPSHOT    \r\n\r\ningress:\r\n  enabled: true\r\n  path: \/\r\n  annotations:\r\n    kubernetes.io\/ingress.class: nginx\r\n    nginx.ingress.kubernetes.io\/affinity: \"cookie\"\r\n    nginx.ingress.kubernetes.io\/session-cookie-name: \"route\"\r\n\r\nresources:\r\n  constraints: \r\n    enabled: true\r\n  requests:\r\n    cpu: 500m<\/pre>\n
At a minimum, the only details that are required are the application image and the tag, the rest of the details is just for illustration of what is feasible.<\/p>\n
To deploy the app, run the following command:<\/p>\n
helm install bk-charts\/generic-app-chart  --name my-app --values sample-values.yaml<\/pre>\n
and a bunch of Kubernetes resources should show up supporting this application.<\/p>\n
App upgrades are simple, facilitated by helm:<\/p>\n
helm upgrade my-app bk-charts\/generic-app-chart -f sample-values.yaml<\/pre>\n
Conclusion<\/h2>\n
The chart is fairly minimal at this point and creates a small set of Kubernetes resources – a secrets to hold secrets!, a deployment, a service, an\u00a0hpa<\/a> to scale the app, which suffices the kind of use cases that I have encountered so far.<\/p>\n
\n\n\n\n
Published on System Code Geeks with permission by Biju Kunjummen, partner at our SCG program<\/a>. See the original article here: Helm chart to deploy and scale a generic app image<\/a><\/p>\n
Opinions expressed by System Code Geeks contributors are their own.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
This is a post about a simple\u00a0helm chart that I have worked on to deploy any generic app image to Kubernetes. The chart is available [here] It tries to solve the issue of having to manage a set of raw Kubernetes resources(deployment,secrets,hpa) and instead letting helm manage these resources. The chart is generic enough that …<\/p>\n","protected":false},"author":3223,"featured_media":188,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[39],"tags":[145],"class_list":["post-3863","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-devops","tag-kubernetes"],"yoast_head":"\nHelm chart to deploy and scale a generic app image - System Code Geeks - 2026<\/title>\n<meta name=\"description\" content=\"Interested to learn about Helm chart? 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