Connecting to a Cluster

Scenario

This document describes how to connect a local client to an edge cluster through kubectl, which is the Kubernetes command-line tool.

Prerequisites

• The cURL software program has been installed.
• Select the appropriate way to obtain kubectl based on the operating system:

  Replace v1.8.13 in the command with the kubectl version required by your business.

  • MacOS X
    Run the following command to obtain kubectl:

    curl -LO https://storage.googleapis.com/kubernetes-release/release/v1.8.13/bin/darwin/amd64/kubectl

  • Linux
    Run the following command to obtain kubectl:

    curl -LO https://storage.googleapis.com/kubernetes-release/release/v1.8.13/bin/linux/amd64/kubectl

  • Windows
    Run the following command to obtain kubectl:

    curl -LO https://storage.googleapis.com/kubernetes-release/release/v1.8.13/bin/windows/amd64/kubectl.exe

Directions

Installing kubectl

1. Install kubectl as instructed in Installing and Setting Up kubectl.

   • If you have already installed kubectl, skip this step.
   • This step uses the Linux operating system as an example.

2. Run the following commands to grant permissions to use kubectl.

   chmod +x ./kubectl

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

3. Run the following command to check the installation result.

   kubectl version

   If the output is similar to the following version information, the installation was successful.

   Client Version: version.Info{Major:"1", Minor:"5", GitVersion:"v1.5.2", GitCommit:"08e099554f3c31f6e6f07b448ab3ed78d0520507", GitTreeState:"clean", BuildDate:"2017-01-12T04:57:25Z", GoVersion:"go1.7.4", Compiler:"gc", Platform:"linux/amd64"}

Obtaining cluster certificate information

1. Log in to the Tencent Cloud TKE console and click Edge Clusters in the left sidebar.
2. On the Edge Clusters page, click View the cluster credential for the cluster to be connected.
3. In the Cluster Credential window that appears, you can view, copy, and download the credential.

   You can save the cluster access credential locally by clicking Copy or Download as needed.

4. In Internet access, click to enable internet access for the cluster. You can also see Configuring kubectl autocomplete for accessing with the cluster access credential.

Using kubectl to manipulate a cluster through certificate information

Request method

The kubectl command format is as follows:

--kubeconfig=<Local cluster access credential>

Example

Run the following command to view existing namespaces under the cluster.

kubectl get namespace --kubeconfig=cls-8ipgf8u4.kubeconfig

The cluster credential used in this example is cls-8ipgf8u4.kubeconfig. In real-life cases, replace it with the actual credential.
If a message similar to the following is returned, the request was successful.

NAME         STATUS    AGE
default      Active    11d
kube-system  Active    11d

Configuring kubectl autocomplete

You can configure kubectl autocomplete to improve usability by running the following command.

source <(kubectl completion bash)