- \n
- A Kubernetes cluster with role-based access control (RBAC) enabled.<\/li>\n
- The kubectl command line tool is installed on your local machine and configured to connect to your cluster.<\/li>\n
- You can test your connection with the following command:<\/li>\n
- \n\n
kubectl cluster-info<\/code><\/pre>\n<\/div>\n<\/li>\n- If you don't get any errors, you are connected to the cluster. If you are accessing multiple clusters with kubectl, make sure you have selected the correct cluster context by running the following:<\/li>\n
- \n
\nkubectl config get-contexts<\/code><\/pre>\n<\/div>\n<\/li>\n- The output lists the available settings:<\/li>\n
- \n
\nOutput\r\nCURRENT NAME CLUSTER AUTHINFO NAMESPACE\r\n* do-fra1-helm3-example do-fra1-helm3-example do-fra1-helm3-example-admin<\/code><\/pre>\n<\/div>\n<\/li>\n- Here, the asterisk (*) indicates that we are connected to the do-fra1-helm3-example cluster. To switch clusters, run:<\/li>\n
- \n
\nkubectl config use-context context-name<\/code><\/pre>\n<\/div>\n<\/li>\n- Once you are connected to the correct cluster, continue to Step 1 to begin installing Helm.<\/li>\n<\/ul>\n
Step 1 \u2013 Install Helm 3<\/h2>\n
In this section, you will install Helm 3 using the officially provided shell script.<\/p>\n
Start by going to \/tmp, where you can find the installation script by running:<\/p>\n
\ncd \/tmp<\/code><\/pre>\n<\/div>\nDownload the script with the following command:<\/p>\n
\ncurl -fsSL -o get_helm.sh https:\/\/raw.githubusercontent.com\/helm\/helm\/master\/scripts\/get-helm-3<\/code><\/pre>\n<\/div>\nYou can check get_helm.sh in your text editor to make sure it is safe.<\/p>\n
Make it executable by setting its permissions to the following:<\/p>\n
\nchmod u+x get_helm.sh<\/code><\/pre>\n<\/div>\nFinally, run it to install Helm 3:<\/p>\n
\n.\/get_helm.sh<\/code><\/pre>\n<\/div>\nYou will get output similar to the following:<\/p>\n
\nOutput\r\nDownloading https:\/\/get.helm.sh\/helm-v3.5.2-linux-amd64.tar.gz\r\nVerifying checksum... Done.\r\nPreparing to install helm into \/usr\/local\/bin\r\nhelm installed into \/usr\/local\/bin\/helm<\/code><\/pre>\n<\/div>\nYou have installed Helm 3 on your machine. Now you will be introduced to chart repositories and how to use them.<\/p>\n
Step 2 \u2013 Setting up chart repositories<\/h2>\n
Helm charts are stored in chart repositories that can be hosted by anyone. By default, Helm 3 is not preconfigured with any repositories. Previous versions of Helm included a central chart repository. However, the design of Helm 3 was intentionally geared toward chart developers managing their own repository, allowing for greater freedom and faster releases. This means that for every chart you want to use, you need to make sure you add the hosting repository to your Helm installation.<\/p>\n
To help you find the right repository, you can use ArtifactHub.io, an open source website managed by CNCF that catalogs Helm charts and their repositories. It also tracks popular and useful charts that other CNCF projects use, so it's different from the stable repository that previous versions of Helm worked from. It's a great resource for common projects, like Nginx logs or monitoring tools.<\/p>\n
You can search for the chart you want to install from the main page. Nginx search will show all the indexed charts related to it.<\/p>\n
\nYou will install the community version managed by the Kubernetes team. Search for ingress-nginx to find it in your results. Select it to access the page.<\/p>\n
\nEach chart should have a description detailing the task, along with instructions for adding its repository to the chart installation and installation. Otherwise, you can still get the necessary instructions by pressing the INSTALL button on the right side of the page.<\/p>\n
\nYou can click the blue button next to the command to copy it. For the first command, do this and run it:<\/p>\n\nhelm repo add ingress-nginx https:\/\/kubernetes.github.io\/ingress-nginx<\/code><\/pre>\n<\/div>\nTo add a repository to Helm, you run helm repo add . The parameters it accepts are the name of the repository and its location.<\/p>\n
The output will be:<\/p>\n
\nOutput\r\n\"ingress-nginx\" has been added to your repositories<\/code><\/pre>\n<\/div>\nWhen you add a new repository, you need to tell Helm what it contains by running:<\/p>\n
\nhelm repo update<\/code><\/pre>\n<\/div>\nYou will receive the following output indicating that the update was successful:<\/p>\n
\nOutput\r\nHang tight while we grab the latest from your chart repositories...\r\n...Successfully got an update from the \"ingress-nginx\" chart repository\r\nUpdate Complete. \u2388Happy Helming!\u2388<\/code><\/pre>\n<\/div>\nAt this point, you've become familiar with ArtifactHub and what it offers. You've also added a new repository to your Helm installation. Next, you'll install the Helm chart.<\/p>\n
Step 3 \u2013 Installing Helm Chart<\/h2>\n
In the previous section, you added the ingress-nginx graph repository. Now you will install it on your cluster.<\/p>\n
Each chart has configuration variables that you can set to change its behavior. These variables are stored in a file called values.yaml that is part of the chart. Unless you have downloaded the chart to your device, you will need to run the following command to view it:<\/p>\n
\nhelm show values chart_name<\/code><\/pre>\n<\/div>\nTo display the available variables for ingress-nginx, replace chart_name:<\/p>\n
\nhelm show values ingress-nginx\/ingress-nginx<\/code><\/pre>\n<\/div>\nThe output will be long and will show the contents of values.yaml for ingress-nginx.<\/p>\n
To install the chart, you can use the install command:<\/p>\n
\nhelm install release_name repository\/chart_name<\/code><\/pre>\n<\/div>\nA release is a deployed instance of the graph and here you call it ingress-nginx.<\/p>\n
This command installs the chart with default values for the variables on your cluster. If you want to change some of them, you can pass new variable values using \u2013set:<\/p>\n
\nhelm install ingress-nginx\/ingress-nginx --set variable_name=variable_value<\/pre>\n<\/div>\n
You can repeat \u2013set for as many variables as you need. Since we won't customize it now, install it as is by running:<\/p>\n
\nhelm install ingress-nginx ingress-nginx\/ingress-nginx<\/code><\/pre>\n<\/div>\nThe output will be similar to the following:<\/p>\n
\nOutput\r\nNAME: ingress-nginx\r\nLAST DEPLOYED: Wed Feb 24 10:12:37 2021\r\nNAMESPACE: default\r\nSTATUS: deployed\r\nREVISION: 1\r\nTEST SUITE: None\r\nNOTES:\r\nThe ingress-nginx controller has been installed.\r\nIt may take a few minutes for the LoadBalancer IP to be available.\r\nYou can watch the status by running 'kubectl --namespace default get services -o wide -w ingress-nginx-controller'\r\n...<\/code><\/pre>\n<\/div>\nNote that NAME matches the version name you specified. Helm also lists common information, such as the release status and the namespace it is deployed to. The NOTES section varies between charts and usually contains quick start tips or warns about some common issues when using the chart's resources. Here, it mentions that the Load Balancer is being created and may take some time to complete.<\/p>\n
To check the deployed charts, use the command list:<\/p>\n
\n\nhelm list<\/code><\/pre>\n<\/div>\n<\/div>\nYou will notice that ingress-nginx is the only deployed graph currently:<\/p>\n
\nOutput\r\nNAME NAMESPACE REVISION UPDATED STATUS CHART APP VERSION\r\ningress-nginx default 1 2021-02-24 10:12:37.281049711 +0000 UTC deployed ingress-nginx-3.23.0 0.44.0<\/code><\/pre>\n<\/div>\nYou can find the services it has in its cluster by running the following:<\/p>\n
\nkubectl get services<\/code><\/pre>\n<\/div>\nThe output will be similar to this:<\/p>\n
\nOutput\r\nNAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE\r\ningress-nginx-controller LoadBalancer 10.245.211.81 46.101.68.67 80:30704\/TCP,443:30700\/TCP 7m19s\r\ningress-nginx-controller-admission ClusterIP 10.245.50.17 <none> 443\/TCP 7m19s\r\nkubernetes ClusterIP 10.245.0.1 <none> 443\/TCP 83m<\/code><\/pre>\n<\/div>\nNow that you have deployed a version to your cluster, you will change its configuration during deployment.<\/p>\n
Step 4 \u2013 Upgrade a version<\/h2>\n
Once a version is running, you don't have to destroy it and re-create it again when you need to change its configuration. You can use the upgrade command to upgrade the version with a new version of the chart or to set new settings.<\/p>\n
The ingress-nginx diagram shows the controller.replicaCount variable, which controls the number of deployed controller pods. By default, it is set to one, which you can verify by listing the available pods:<\/p>\n
\nkubectl get pods<\/code><\/pre>\n<\/div>\nYou will notice that there is only one:<\/p>\n
\nOutput\r\nNAME READY STATUS RESTARTS AGE\r\ningress-nginx-controller-7fc74cf778-kjtst 1\/1 Running 0 12m<\/code><\/pre>\n<\/div>\nIf you want more to be deployed for redundancy (for example, three), you can upgrade the version and set the variable to 3 by running:<\/p>\n
\nhelm upgrade ingress-nginx ingress-nginx\/ingress-nginx --set controller.replicaCount=3 --reuse-values<\/code><\/pre>\n<\/div>\nYou also pass --reuse-values , which instructs Helm to place your changes on top of the deployed version and preserve the previous configuration.<\/p>\n
In the output, Helm makes corrections to indicate that the version has been upgraded:<\/p>\n
\nOutput\r\nNAME: ingress-nginx\r\nLAST DEPLOYED: Wed Feb 24 12:07:54 2021\r\nNAMESPACE: default\r\nSTATUS: deployed\r\nREVISION: 2\r\nTEST SUITE: None\r\nNOTES:\r\n...<\/code><\/pre>\n<\/div>\nYou can list the available pods by running the following:<\/p>\n
\nkubectl get pods<\/code><\/pre>\n<\/div>\nInstead of one, you will find three pods listed:<\/p>\n
\nOutput\r\nNAME READY STATUS RESTARTS AGE\r\ningress-nginx-controller-7fc74cf778-4hk9g 1\/1 Running 0 18s\r\ningress-nginx-controller-7fc74cf778-kjtst 1\/1 Running 0 22m\r\ningress-nginx-controller-7fc74cf778-wz595 1\/1 Running 0 18s<\/code><\/pre>\n<\/div>\nNext, you will revert the changes and delete the publication altogether.<\/p>\n
Step 5 \u2013 Restore and delete a copy<\/h2>\n
When you upgrade a version, its revision number increases. Internally, Helm stores all versions of a version, allowing you to revert to a previous version if needed.<\/p>\n
To revert the number of pods back to just one, you can rerun the upgrade command and manually adjust the number as this is a small change. However, when working with larger graphs with many variables, manual reverting is not possible and should be automatic.<\/p>\n
To restore a version, use the restore command:<\/p>\n
\nhelm rollback release_name release_revision<\/code><\/pre>\n<\/div>\nYou can use it to revert changes you made to ingress-nginx, going back to version 1:<\/p>\n
\nhelm rollback ingress-nginx 1<\/code><\/pre>\n<\/div>\nYou will receive the following output indicating that the operation was successful:<\/p>\n
\nOutput\r\nRollback was a success! Happy Helming!<\/code><\/pre>\n<\/div>\nYou can check the current version by listing the versions:<\/p>\n
\nhelm list<\/code><\/pre>\n<\/div>\nYou will notice that the revision is now 3 and not 1:<\/p>\n
\nOutput\r\nNAME NAMESPACE REVISION UPDATED STATUS CHART APP VERSION\r\ningress-nginx default 3 2021-02-24 12:43:21.523664768 +0000 UTC deployed ingress-nginx-3.23.0 0.44.0<\/code><\/pre>\n<\/div>\nHelm considers every change, including a rollback, as a new revision in a release. By checking the number of deployed pods by running:<\/p>\n
\nkubectl get pods<\/code><\/pre>\n<\/div>\nYou will notice that there is only one:<\/p>\n
\nOutput\r\nNAME READY STATUS RESTARTS AGE\r\ningress-nginx-controller-7fc74cf778-kjtst 1\/1 Running 0 41m<\/code><\/pre>\n<\/div>\nTo delete a version and all its revisions, you can use helm delete:<\/p>\n
\nhelm delete release_name<\/code><\/pre>\n<\/div>\nSince you will no longer need it, remove ingress-nginx by running the following command:<\/p>\n
\nhelm delete ingress-nginx<\/code><\/pre>\n<\/div>\nThe output will be:<\/p>\n
\nOutput\r\nrelease \"ingress-nginx\" uninstalled<\/code><\/pre>\n<\/div>\nYou can list the versions to check that none exist:<\/p>\n
\nhelm list<\/code><\/pre>\n<\/div>\nThe output table will have no rows:<\/p>\n
\nOutput\r\nNAME NAMESPACE REVISION UPDATED STATUS CHART APP VERSION\r\n<\/code><\/pre>\n<\/div>\nNow that the version has been deleted, you can reuse its name for future deployments.<\/p>\n
Step 6 \u2013 (Optional) Create Custom Charts<\/h2>\n
In this optional step, you will learn how to create a custom chart, where to place resource definitions, and how to package it for further distribution.<\/p>\n
You will create a new chart called sample-chart. To create it, run the following command:<\/p>\n
\nhelm create example-chart<\/code><\/pre>\n<\/div>\nThis will create a new directory called example-chart with the following files and structure:<\/p>\n
\ncharts\/\r\ntemplates\/\r\n\u251c\u2500 tests\/\r\n\u2502 \u251c\u2500 test-connection.yaml\r\n\u251c\u2500 deployment.yaml\r\n\u251c\u2500 hpa.yaml\r\n\u251c\u2500 ingress.yaml\r\n\u251c\u2500 NOTES.txt\r\n\u251c\u2500 service.yaml\r\n\u251c\u2500 serviceaccount.yaml\r\n\u251c\u2500 _helpers.tpl\r\nChart.yaml\r\nvalues.yaml<\/code><\/pre>\n<\/div>\nThe resource definitions that your graph installs on the target clusters are in the template directory. The default ones that Helm created as a starting point deploy an Nginx ingress controller. Even though their file extension is YAML, they use Go's formatting syntax to remain configurable through exposed variables that you can pass. You can view the contents of service.yaml by running:<\/p>\n
\ncat example-chart\/templates\/service.yaml<\/code><\/pre>\n<\/div>\nYou will notice that it has formatting instructions for producing values surrounded by double parentheses:<\/p>\n
\nOutputapiVersion: v1\r\nkind: Service\r\nmetadata:\r\nname: {{ include \"mychart.fullname\" . }}\r\nlabels:\r\n{{- include \"mychart.labels\" . | nindent 4 }}\r\nspec:\r\ntype: {{ .Values.service.type }}\r\nports:\r\n- port: {{ .Values.service.port }}\r\ntargetPort: http\r\nprotocol: TCP\r\nname: http\r\nselector:\r\n{{- include \"mychart.selectorLabels\" . | nindent 4 }}<\/code><\/pre>\n<\/div>\nReferenced variables are exposed to the user and defined in values.yaml. Helm NOTES text is stored in NOTES.txt after deployment and is also formatted. Chart metadata, such as the name, version, and version of the software being deployed, is specified in Chart.yaml:<\/p>\n
\napiVersion: v2\r\nname: mychart\r\ndescription: A Helm chart for Kubernetes\r\n...\r\ntype: application\r\n...\r\nversion: 0.1.0\r\n...\r\nappVersion: \"1.16.0\"<\/code><\/pre>\n<\/div>\nTo check what Helm is deploying, you can pass \u2013dry-run and \u2013debug to helm install by pointing to the chart directory:<\/p>\n
\nhelm install example-chart --dry-run --debug .\/example-chart<\/code><\/pre>\n<\/div>\nThe output will be long and will include all the final resource definitions that will be applied to your cluster. While you are working on your graph, you can use the upgrade command to push new versions to Kubernetes.<\/p>\n
When the time is up for sharing the chart, you can make it available for distribution by running:<\/p>\n
\nhelm package .\/example-chart<\/code><\/pre>\n<\/div>\nThe output will be:<\/p>\n
\nOutput\r\nSuccessfully packaged chart and saved it to: ...\/example-chart-0.1.0.tgz<\/code><\/pre>\n<\/div>\nThe packaged chart can be installed just like the ones in the added repositories:<\/p>\n
\nhelm install example-chart example-chart-0.1.0.tgz<\/code><\/pre>\n<\/div>\nAt this point, you have created and deployed a custom chart. You have also packaged it and become familiar with its structure.<\/p>\n
Result<\/h2>\n
You now know how to use Helm to install and upgrade software deployed to your Kubernetes cluster. You've added chart repositories and learned why they're important and how ArtifactHub can help you find them. You've also created a new custom chart and learned about release revisions and how to revert if necessary.<\/p>","protected":false},"excerpt":{"rendered":"Introduction Helm is a package manager for Kubernetes that allows developers and operators to\u2026","protected":false},"author":1,"featured_media":15355,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"\u0646\u062d\u0648\u0647 \u0646\u0635\u0628 \u0646\u0631\u0645 \u0627\u0641\u0632\u0627\u0631 \u0631\u0648\u06cc \u062e\u0648\u0634\u0647 \u0647\u0627\u06cc Kubernetes","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_yoast_wpseo_canonical":"","_yoast_wpseo_opengraph-description":"","_yoast_wpseo_opengraph-image":"","_yoast_wpseo_twitter-description":"","_yoast_wpseo_twitter-image":"","_yoast_wpseo_focuskeywords":"","_yoast_wpseo_primary_category":"193","footnotes":""},"categories":[193,363],"tags":[419],"class_list":{"0":"post-15350","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-tutorials","8":"category-programming","9":"tag-kubernetes"},"yoast_head":"\n
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