Deploying and Managing a Cluster on Linode Kubernetes Engine (LKE) with the Linode API

The Linode Kubernetes Engine (LKE) is a fully-managed container orchestration engine for deploying and managing containerized applications and workloads. LKE combines Linode’s ease of use and simple pricing with the infrastructure efficiency of Kubernetes. When you deploy a LKE cluster, you receive a Kubernetes Master at no additional cost; you only pay for the Linodes (worker nodes), NodeBalancers (load balancers), and Block Storage Volumes. Your LKE Cluster’s Master node runs the Kubernetes control plane processes – including the API, scheduler, and resource controllers.

Additional LKE features:

• etcd Backups: A snapshot of your cluster’s metadata is backed up continuously, so your cluster is automatically restored in the event of a failure.
• High Availability: All of your control plane components are monitored and automatically recover if they fail.

You can easily deploy an LKE cluster in several ways:

• Via the Linode Cloud Manager

• With the Linode API (as presented in this guide)

  Note

  The Linode API and the Kubernetes API are two separate interfaces, and both are mentioned in this article. The Linode API allows you to manipulate your Linode infrastructure, while the Kubernetes API allows you to manage the software objects running in your cluster.

• With the Linode CLI

These Linode-provided interfaces can be used to create, delete, and update the structural elements of your cluster, including:

• The number of nodes that make up a cluster’s node pools.
• The region where your node pools are deployed.
• The hardware resources for each node in your node pools.
• The Kubernetes version deployed to your cluster’s Master node and worker nodes.

The Kubernetes API and kubectl are the primary ways you interact with your LKE cluster once it’s been created. These tools can be used to configure, deploy, inspect, and secure your Kubernetes workloads, deploy applications, create services, configure storage and networking, and define controllers.

In this Guide

This guide covers how to use the Linode API to:

• Create an LKE cluster
• Connect kubectl to your LKE cluster
• Inspect your LKE cluster
• Modify an existing LKE cluster
• Delete an LKE cluster

Before You Begin

1. Familiarize yourself with the Linode Kubernetes Engine service. This information helps you understand the benefits and limitations of LKE.

2. Create an API Token. You need this to access the LKE service.

3. Install kubectl on your computer. You use kubectl to interact with your cluster once it’s deployed.

4. If you are new to Kubernetes, refer to our A Beginner’s Guide to Kubernetes series to learn about general Kubernetes concepts. This guide assumes a general understanding of core Kubernetes concepts.

Install kubectl

macOS:

Install via Homebrew:

brew install kubernetes-cli

If you don’t have Homebrew installed, visit the Homebrew home page for instructions. Alternatively, you can manually install the binary; visit the Kubernetes documentation for instructions.

Linux:

1. Download the latest kubectl release:

   curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl
   

2. Make the downloaded file executable:

   chmod +x ./kubectl
   

3. Move the command into your PATH:

   sudo mv ./kubectl /usr/local/bin/kubectl
   

Note

You can also install kubectl via your package manager; visit the Kubernetes documentation for instructions.

Windows:

Visit the Kubernetes documentation for a link to the most recent Windows release.

Create an LKE Cluster

Note

The available plan types for LKE worker nodes are Shared, Dedicated CPU, and High Memory plans.

1. To create an LKE Cluster, send a POST request to the /lke/clusters endpoint. The example below displays all possible request body parameters. Note that tags is an optional parameter.

    curl -H "Content-Type: application/json" \
         -H "Authorization: Bearer $TOKEN" \
         -X POST -d '{
            "label": "cluster12345",
            "region": "us-central",
            "k8s_version": "1.16",
            "tags": ["ecomm", "blogs"],
            "node_pools": [
              { "type": "g6-standard-2", "count": 2},
              { "type": "g6-standard-4", "count": 3}
            ]
         }' https://api.linode.com/v4/lke/clusters
   

   You receive a response similar to:

   {"k8s_version": "1.16", "updated": "2019-08-02T17:17:49", "region": "us-central", "tags": ["ecomm", "blogs"], "label": "cluster12345", "id": 456, "created": "2019-22-02T17:17:49"}%

2. Make note of your cluster’s ID, as you need it to continue to interact with your cluster in the next sections. In the example above, the cluster’s ID is "id": 456. You can also access your cluster’s ID by listing all LKE Clusters on your account.

   Note

   Each Linode account has a limit to the number of Linode resources they can deploy. This includes services, like Linodes, NodeBalancers, Block Storage, etc. If you run into issues deploying the number of nodes you designate for a given cluster’s node pool, you may have run into a limit on the number of resources allowed on your account. Contact Linode Support if you believe this may be the case.

Connect to your LKE Cluster

Now that your LKE cluster is created, you can access and manage your cluster using kubectl on your computer. This gives you the ability to interact with the Kubernetes API, and to create and manage Kubernetes objects in your cluster.

To communicate with your LKE cluster, kubectl requires a copy of your cluster’s kubeconfig. In this section, you access the contents of your kubeconfig using the Linode API and then set up kubectl to communicate with your LKE cluster.

1. Access your LKE cluster’s kubeconfig file by sending a GET request to the /lke/clusters/{clusterId}/kubeconfig endpoint. Ensure you replace 12345 with your cluster’s ID that you recorded in the previous section:

    curl -H "Authorization: Bearer $TOKEN" \
      https://api.linode.com/v4/lke/clusters/12345/kubeconfig
   

   The API returns a base64 encoded string (a useful format for automated pipelines) representing your kubeconfig. Your output resembles the following:

   {"kubeconfig": "YXBpVmVyc2lvbjogdjEKY2x1c3RlcnM6Ci0gY2x1c3RlcjoKICAgIGNlcnRpZmljYXRlLWF1dGhvcml0eS1kYXRhOiBMUzB0TFMxQ1JVZEpUaUJEUlZKVVNVWkpRMEZVUlMwdExTMHRDazFKU1VONVJFTkRRV0pEWjBGM1NVSkJaMGxDUVVSQlRrSm5hM0ZvYTJsSE9YY3dRa0ZSYzBaQlJFRldUVkpOZDBWUldVUldVVkZFUlhkd2NtUlhTbXdLWTIwMWJHUkhWbnBOUWpSWVJGUkZOVTFFWjNkTmFrVXpUVlJqTVUxV2IxaEVWRWsx ... 0TFMwdExRbz0K"}%

2. Copy the kubeconfig field’s value from the response body, since you need it in the next step.

   Note

   Make sure you only copy the long string inside the quotes following "kubeconfig": in your output. Do not copy the curly braces or anything outside of them. You receive an error if you use the full output in later steps.

3. Save the base64 kubeconfig to an environment variable:

    KUBE_VAR='YXBpVmVyc2lvbjogdjEK ... 0TFMwdExRbz0K'
   

4. Navigate to your computer’s ~/.kube directory. This is where kubectl looks for kubeconfig files, by default.

    cd ~/.kube
   

5. Create a directory called configs within ~/.kube. You can use this directory to store your kubeconfig files.

   mkdir configs
   cd configs
   

6. Decode the contents of $KUBE_VAR and save it to a new YAML file:

    echo $KUBE_VAR | base64 -D > cluster12345-config.yaml
   

   Note

   The YAML file that you decode to (cluster12345-config.yaml here) can have any name of your choosing.

7. Add the kubeconfig file to your $KUBECONFIG environment variable.

    export KUBECONFIG=cluster12345-config.yaml
   

8. Verify that your cluster is selected as kubectl’s current context:

    kubectl config get-contexts
   

9. View the contents of the configuration:

    kubectl config view
   

   Note

   You can also access a decoded version of your kubeconfig file in the Linode Cloud Manager.

10. View all nodes in your LKE cluster using kubectl:

     kubectl get nodes
    

    Your output resembles the following example, but varies depending on your own cluster’s configurations.

    NAME                      STATUS   ROLES  AGE     VERSION
    lke166-193-5d44703cd092   Ready    none   2d22h   v1.14.0
    lke166-194-5d44703cd780   Ready    none   2d22h   v1.14.0
    lke166-195-5d44703cd691   Ready    none   2d22h   v1.14.0
    lke166-196-5d44703cd432   Ready    none   2d22h   v1.14.0
    lke166-197-5d44703cd211   Ready    none   2d22h   v1.14.0

    Now that you are connected to your LKE cluster, you can begin using kubectl to deploy applications, inspect and manage cluster resources, and view logs.

Persist the Kubeconfig Context

If you create a new terminal window, it does not have access to the context that you specified using the previous instructions. This context information can be made persistent between new terminals by setting the KUBECONFIG environment variable in your shell’s configuration file.

Note

If you are using Windows, review the official Kubernetes documentation for how to persist your context.

These instructions persist the context for users of the Bash terminal. They are similar for users of other terminals:

1. Open up your Bash profile (e.g. ~/.bash_profile) in the text editor of your choice and add your configuration file to the $KUBECONFIG PATH variable.

   If an export KUBECONFIG line is already present in the file, append to the end of this line as follows; if it is not present, add this line to the end of your file:

   export KUBECONFIG=$KUBECONFIG:$HOME/.kube/config:$HOME/.kube/configs/cluster12345-config.yaml
   

   Note

   Alter the $HOME/.kube/configs/cluster12345-config.yaml path in the above line with the name of the file you decoded to in the previous section.

2. Close your terminal window and open a new window to receive the changes to the $KUBECONFIG variable.

3. Use the config get-contexts command for kubectl to view the available cluster contexts:

   kubectl config get-contexts
   

   You should see output similar to the following:

   CURRENT  NAME                         CLUSTER     AUTHINFO          NAMESPACE
   *        kubernetes-admin@kubernetes  kubernetes  kubernetes-admin

4. If your context is not already selected, (denoted by an asterisk in the current column), switch to this context using the config use-context command. Supply the full name of the cluster (including the authorized user and the cluster):

   kubectl config use-context kubernetes-admin@kubernetes
   

   You should see output like the following:

   Switched to context "kubernetes-admin@kubernetes".

5. You are now ready to interact with your cluster using kubectl. You can test the ability to interact with the cluster by retrieving a list of Pods in the kube-system namespace:

   kubectl get pods -n kube-system
   

Inspect your LKE Cluster

Once you have created an LKE Cluster, you can access information about its structural configuration using the Linode API.

List LKE Clusters

To view a list of all your LKE clusters, send a GET request to the /lke/clusters endpoint.

curl -H "Authorization: Bearer $TOKEN" \
    https://api.linode.com/v4/lke/clusters

The returned response body displays the number of clusters deployed to your account and general details about your LKE clusters:

{"results": 2, "data": [{"updated": "2019-08-02T17:17:49", "region": "us-central", "id": 456, "k8s_version": "1.16", "label": "cluster-12345", "created": "2019-08-02T17:17:49", "tags": ["ecomm", "blogs"]}, {"updated": "2019-08-05T17:00:04", "region": "us-central", "id": 789, "k8s_version": "1.16", "label": "cluster-56789", "created": "2019-08-05T17:00:04", "tags": ["ecomm", "marketing"]}], "pages": 1, "page": 1}%

View an LKE Cluster

You can use the Linode API to access details about an individual LKE cluster. You need your cluster’s ID to access information about this resource. If you don’t know your cluster’s ID, see the List LKE Clusters section.

To view your LKE cluster, send a GET request to the /lke/clusters/{clusterId} endpoint. In this example, ensure you replace 12345 with your cluster’s ID:

curl -H "Authorization: Bearer $TOKEN" \
        https://api.linode.com/v4/lke/clusters/12345

Your output resembles the following:

{"created": "2019-08-02T17:17:49", "updated": "2019-08-02T17:17:49", "k8s_version": "1.16", "tags": ["ecomm", "blogs"], "label": "cluster-12345", "id": 456, "region": "us-central"}%

List a Cluster’s Node Pools

A node pool consists of one or more Linodes (worker nodes). Each node in the pool has the same plan type. Your LKE cluster can have several node pools. Each pool is assigned its own plan type and number of nodes. To view a list of an LKE cluster’s node pools, you need your cluster’s ID. If you don’t know your cluster’s ID, see the List LKE Clusters section.

To list your cluster’s node pools, send a GET request to the /lke/clusters/{clusterId}/pools endpoint. In this example, replace 12345 with your cluster’s ID:

curl -H "Authorization: Bearer $TOKEN" \
    https://api.linode.com/v4/lke/clusters/12345/pools

The response body includes information on each node pool’s pool ID, Linode type, and node count; and each node’s individual ID and status.

{"pages": 1, "page": 1, "data": [{"count": 2, "id": 193, "type": "g6-standard-2", "linodes": [{"id": "13841932", "status": "ready "}, {"id": "13841933", "status": "ready"}]}, {"count": 3, "id": 194, "type": "g6-standard-4", "linodes": [{"id": "13841934", "status": "ready"}, {"id": "13841935", "status": "ready"}, {"id": "13841932", "status": "ready"}]}], "results": 2}%

View a Node Pool

You can use the Linode API to access details about a specific node pool in an LKE cluster. You need your cluster’s ID and node pool ID to access information about this resource. To retrieve your cluster’s ID, see the List LKE Clusters section. To find a node pool’s ID, see the List a Cluster’s Node Pools section.

To view a specific node pool, send a GET request to the /lke/clusters/{clusterId}/pools/{poolId} endpoint. In this example, replace 12345 with your cluster’s ID and 456 with the node pool’s ID:

curl -H "Authorization: Bearer $TOKEN" \
    https://api.linode.com/v4/lke/clusters/12345/pools/456

The response body provides information about the number of nodes in the node pool, the node pool’s ID, and type. You also retrieve information about each individual node in the node pool, including the Linode’s ID and status.

{"count": 2, "id": 193, "type": "g6-standard-2", "linodes": [{"id": "13841932", "status": "ready"}, {"id": "13841933", "status": "ready"}]}%

Note

If desired, you can use your node pool’s Linode ID(s) to get more details about each node in the pool. Send a GET request to the /linode/indstances/{linodeId} endpoint. In this example, ensure you replace 13841932 with your Linode’s ID.

curl -H "Authorization: Bearer $TOKEN" \
    https://api.linode.com/v4/linode/instances/13841932

Although you have access to your cluster’s nodes, it is recommended that you only interact with your nodes via the Linode’s LKE interfaces (like the LKE endpoints in Linode’s API, or the Kubernetes section in the Linode Cloud Manager), or via the Kubernetes API and kubectl.

Modify your LKE Cluster

Once an LKE cluster is created, you can modify the cluster’s label, node pools, and tags. In this section you learn how to modify each of these parts of your cluster.

Update your LKE Cluster Label

To update your LKE cluster’s label, send a PUT request to the /lke/clusters/{clusterId} endpoint. In this example, ensure you replace 12345 with your cluster’s ID:

curl -H "Content-Type: application/json" \
        -H "Authorization: Bearer $TOKEN" \
        -X PUT -d '{
        "label": "updated-cluster-name"
        }' https://api.linode.com/v4/lke/clusters/12345

The response body displays the updated cluster label:

{"created": "2019-08-02T17:17:49", "updated": "2019-08-05T19:11:19", "k8s_version": "1.16", "tags": ["ecomm", "blogs"], "label": "updated-cluster-name", "id": 456, "region": "us-central"}%

Add a Node Pool to your LKE Cluster

A node pool consists of one or more Linodes (worker nodes). Each node in the pool has the same plan type and is identical to each other. Your LKE cluster can have several node pools, each pool with its own plan type and number of nodes.

You need your cluster’s ID in order to add a node pool to it. If you don’t know your cluster’s ID, see the List LKE Clusters section.

To add a node pool to an existing LKE cluster, send a POST request to the /lke/clusters/{clusterId}/pools endpoint. The request body must include the type and count parameters. In the URL of this example, ensure you replace 12345 with your own cluster’s ID:

curl -H "Content-Type: application/json" \
        -H "Authorization: Bearer $TOKEN" \
        -X POST -d '{
        "type": "g6-standard-1",
        "count": 5
        }' https://api.linode.com/v4/lke/clusters/12345/pools

The response body resembles the following:

{"count": 5, "id": 196, "type": "g6-standard-1", "linodes": [{"id": "13841945", "status": "ready"}, {"id": "13841946", "status": "ready"}, {"id": "13841947", "status": "ready"}, {"id": "13841948", "status": "ready"}, {"id": "13841949", "status": "ready"}]}%

Note

Each Linode account has a limit to the number of Linode resources they can deploy. This includes services, like Linodes, NodeBalancers, Block Storage, etc. If you run into issues deploying the number of nodes you designate for a given cluster’s node pool, you may have run into a limit on the number of resources allowed on your account. Contact Linode Support if you believe this may be the case.

Resize your LKE Node Pool

You can resize an LKE cluster’s node pool to add or decrease its number of nodes. You need your cluster’s ID and the node pool’s ID in order to resize it. If you don’t know your cluster’s ID, see the List LKE Clusters section. If you don’t know your node pool’s ID, see the List a Cluster’s Node Pools section.

Caution

Shrinking a node pool results in deletion of Linodes. Any local storage on deleted Linodes (such as “hostPath” and “emptyDir” volumes, or “local” PersistentVolumes) is erased.

Note

You cannot modify an existing node pool’s plan type. If you would like your LKE cluster to use a different node pool plan type, you can add a new node pool to your cluster with the same number of nodes to replace the current node pool. You can then delete the node pool that is no longer needed.

To update your node pool’s node count, send a PUT request to the /lke/clusters/{clusterId}/pools/{poolId} endpoint. In the URL of this example, replace 12345 with your cluster’s ID and 196 with your node pool’s ID:

curl -H "Content-Type: application/json" \
    -H "Authorization: Bearer $TOKEN" \
    -X PUT -d '{
        "type": "g6-standard-4",
        "count": 6
    }' https://api.linode.com/v4/lke/clusters/12345/pools/196

Note

Each Linode account has a limit to the number of Linode resources they can deploy. This includes services, like Linodes, NodeBalancers, Block Storage, etc. If you run into issues deploying the number of nodes you designate for a given cluster’s node pool, you may have run into a limit on the number of resources allowed on your account. Contact Linode Support if you believe this may be the case.

Recycle All Nodes Within a Cluster

You can recycle all nodes within an LKE cluster to upgrade the nodes to the most recent patch of the cluster’s Kubernetes version and to otherwise replace the physical Linodes that comprise the cluster. Nodes are recycled on a rolling basis, meaning that only one node is down at a time throughout the recycling process. You need your cluster’s ID in order to recycle it’s nodes. If you don’t know your cluster’s ID, see the List LKE Clusters section.

Caution

Recycling your cluster involves deleting each of the Linodes in the node pool and replacing them with new Linodes. Any local storage on deleted Linodes (such as “hostPath” and “emptyDir” volumes, or “local” PersistentVolumes) is erased.

To recycle all nodes within a cluster, send a POST request to the /lke/clusters/{clusterId}/pools/{poolId}/recycle endpoint. In the URL of this example, replace 12345 with your cluster’s ID:

curl -H "Content-Type: application/json" \
    -H "Authorization: Bearer $TOKEN" \
    -X POST \
    https://api.linode.com/v4/lke/clusters/12345/recycle

Recycle your LKE Node Pool

You can recycle an LKE cluster’s node pool to upgrade its nodes to the most recent patch of the cluster’s Kubernetes version. Nodes are recycled on a rolling basis, meaning that only one node is down at a time throughout the recycling process. You need your cluster’s ID and the node pool’s ID in order to recycle it. If you don’t know your cluster’s ID, see the List LKE Clusters section. If you don’t know your node pool’s ID, see the List a Cluster’s Node Pools section.

Caution

Recycling your node pool involves deleting each of the Linodes in the node pool and replacing them with new Linodes. Any local storage on deleted Linodes (such as “hostPath” and “emptyDir” volumes, or “local” PersistentVolumes) is erased.

To recycle your node pool, send a POST request to the /lke/clusters/{clusterId}/pools/{poolId}/recycle endpoint. In the URL of this example, replace 12345 with your cluster’s ID and 196 with your node pool’s ID:

curl -H "Content-Type: application/json" \
    -H "Authorization: Bearer $TOKEN" \
    -X POST \
    https://api.linode.com/v4/lke/clusters/12345/pools/196/recycle

Recycle a Single Node within a Node Pool

You can recycle an individual node within a LKE Cluster’s Node Pool. You need your cluster’s ID and the node ID in order to recycle it. If you don’t know your cluster’s ID, see the List LKE Clusters section. If you don’t know your node ID, see the List a Cluster’s Node Pools section.

Caution

Recycling your node pool involves deleting each of the Linodes in the node pool and replacing them with new Linodes. Any local storage on deleted Linodes (such as “hostPath” and “emptyDir” volumes, or “local” PersistentVolumes) is erased.

To recycle your node, send a POST request to the /lke/clusters/{clusterId}/nodes/{nodeId}/recycle endpoint. In the URL of this example, replace 12345 with your cluster’s ID and 12345-6aa78910bc with your node ID:

curl -H "Authorization: Bearer $TOKEN" \
    https://api.linode.com/v4/lke/clusters/12345/nodes/12345-6aa78910bc

Upgrade your LKE Cluster to the Next Minor Version

To upgrade your LKE cluster’s version, send a PUT request to the /lke/clusters/{clusterId} endpoint. In this example, ensure you replace 12345 with your cluster’s ID, and 1.17 with whichever Kubernetes version is the next currently available:

curl -H "Content-Type: application/json" \
        -H "Authorization: Bearer $TOKEN" \
        -X PUT -d '{
        "k8s_version": "1.17"
        }' https://api.linode.com/v4/lke/clusters/12345

The response body displays the cluster version that will be applied following a recycle:

{"created": "2019-08-02T17:17:49", "updated": "2019-08-05T19:11:19", "k8s_version": "1.17", "tags": ["ecomm", "blogs"], "label": "updated-cluster-name", "id": 456, "region": "us-central"}%

Caution

Nodes within the LKE cluster must be recycled before the cluster version will be successfully upgraded.

Add New Tags to your LKE Cluster

Like many Linode resources, you can add tags to your LKE Cluster for organizational purposes. This section shows you how to add new tags to an existing LKE Cluster.

View all of your account's tags

To view all of the tags existing on your account, issue the following request against the API:

curl -H "Authorization: Bearer $TOKEN" \
    https://api.linode.com/v4/tags

Your response resembles the example:

{"data": [{"label": "blogs"}, {"label": "ecomm"}, {"label": "prod"}, {"label": "monitoring"}], "page": 1, "pages": 1, "results": 4}%

To view all of the tags existing on your account, issue the following request against the API:

curl …

1. View the tags currently assigned to your cluster:

    curl -H "Authorization: Bearer $TOKEN" \
      https://api.linode.com/v4/lke/clusters/12345
   

   The response body contains an array of your cluster’s tags. In the example response, the cluster’s tags are blog, and ecomm.

   {"id": 12345, "status": "ready", "created": "2020-04-13T20:17:22", "updated": "2020-04-13T20:17:22", "label": "cluster-12345", "region": "us-central", "k8s_version": "1.17", "tags": ["blog", "ecomm"]}%

2. To add new tags to your cluster’s existing tags, your request must include a tags array with all previous and new tags. The example request adds the new tags prod and monitoring to the cluster.

    curl -H "Content-Type: application/json" \
          -H "Authorization: Bearer $TOKEN" \
          -X PUT -d '{
            "tags" : ["ecomm", "blog", "prod", "monitoring"]
          }' \
          https://api.linode.com/v4/lke/clusters/12345
   

   The response displays all of your cluster’s tags. In the example response, the cluster’s tags are now blog, ecomm, prod, and monitoring.

   {"id": 12345, "status": "ready", "created": "2020-04-13T20:17:22", "updated": "2020-04-13T20:17:22", "label": "cluster-12345", "region": "us-central", "k8s_version": "1.17", "tags": ["blog", "ecomm", "monitoring", "prod"]}%

Delete Tags from your LKE Cluster

This section shows you how to delete tags from your LKE Cluster.

1. View the tags currently assigned to your cluster:

    curl -H "Authorization: Bearer $TOKEN" \
      https://api.linode.com/v4/lke/clusters/12345
   

   The response body contains an array of your cluster’s tags. In the example response, the cluster’s tags are blog, ecomm, prod, and monitoring.

   {"id": 12345, "status": "ready", "created": "2020-04-13T20:17:22", "updated": "2020-04-13T20:17:22", "label": "cluster-12345", "region": "us-central", "k8s_version": "1.17", "tags": [["blog", "ecomm", "monitoring", "prod"]}%

2. To delete a tag from your cluster, issue a request with only the tags you would like to keep assigned to your cluster. In the example request, the tags monitoring and prod are excluded from the tags array and so are deleted from your cluster.

    curl -H "Content-Type: application/json" \
          -H "Authorization: Bearer $TOKEN" \
          -X PUT -d '{
            "tags" : ["ecomm", "blog"]
          }' \
          https://api.linode.com/v4/lke/clusters/12345
   

   The response displays all of your cluster’s current tags. In the example response, the cluster’s tags are now blog, and ecomm.

   {"id": 12345, "status": "ready", "created": "2020-04-13T20:17:22", "updated": "2020-04-13T20:17:22", "label": "cluster-12345", "region": "us-central", "k8s_version": "1.17", "tags": ["blog", "ecomm"]}%

Delete a Node Pool from an LKE Cluster

When you delete a node pool you also delete the Linodes (nodes) and routes to them. The Pods running on those nodes are evicted and rescheduled. If you have assigned Pods to the deleted Nodes, the Pods might remain in an unschedulable condition if no other node in the cluster satisfies the node selector.

To delete a node pool from a LKE cluster, send a DELETE request to the /lke/clusters/{clusterId}/pools/{poolId} end point. In the URL of this example, replace 12345 with your cluster’s ID and 196 with your cluster’s node pool ID:

Caution

This step is permanent and results in the loss of data.

curl -H "Authorization: Bearer $TOKEN" \
    -X DELETE \
    https://api.linode.com/v4/lke/clusters/12345/pools/196

Delete an LKE Cluster

Deleting an LKE cluster deletes the Master node, all worker nodes, and all NodeBalancers created by the cluster. However, it does not delete any Volumes created by the LKE cluster.

To delete an LKE Cluster, send a DELETE request to the /lke/clusters/{clusterId} endpoint. In the URL of this example, replace 12345 with your cluster’s ID:

Caution

This step is permanent and results in the loss of data.

curl -H "Authorization: Bearer $TOKEN" \
    -X DELETE \
    https://api.linode.com/v4/lke/clusters/12345

General Network and Firewall Information

In an LKE cluster, both of the following types of workload endpoints cannot be reached from the Internet:

• Pod IPs, which use a per-cluster virtual network in the range 10.2.0.0/16

• ClusterIP Services, which use a per-cluster virtual network in the range 10.128.0.0/16

All of the following types of workloads can be reached from the Internet:

• NodePort Services, which listen on all Nodes with ports in the range 30000-32768.

• LoadBalancer Services, which automatically deploy and configure a NodeBalancer.

• Any manifest which uses hostNetwork: true and specifies a port.

• Most manifests which use hostPort and specify a port.

Exposing workloads to the public Internet through the above methods can be convenient, but they can also carry a security risk. You may wish to manually install firewall rules on your cluster nodes; to do so, please see this community post. Linode is developing services which will allow for greater flexibility for the network endpoints of these types of workloads in the future.

Where to Go From Here?

Now that you have created an LKE cluster, you can start deploying workloads to it. Review these guides for further help:

• How to Install Apps on Kubernetes with Helm 3
• Create and Deploy a Docker Container Image to a Kubernetes Cluster
• Troubleshooting Kubernetes