Pod IP Pools

A Pod IP pool is used to manage the Pod network address space, and the address space between each Pod IP pool cannot overlap. When you create a workload, you can select a specific Pod IP pool, so that created Pods will be assigned IP addresses from this Pod IP pool.

Enable Pod IP Pools Before Installation

Installing on Linux

When you implement multi-node installation of KubeSphere on Linux, you need to create a configuration file, which lists all KubeSphere components.

1. In the tutorial of Installing KubeSphere on Linux, you create a default file config-sample.yaml. Modify the file by executing the following command:

   vi config-sample.yaml
   

   Note

   If you adopt All-in-One Installation, you do not need to create a config-sample.yaml file as you can create a cluster directly. Generally, the all-in-one mode is for users who are new to KubeSphere and look to get familiar with the system. If you want to enable Pod IP Pools in this mode (for example, for testing purposes), refer to the following section to see how Pod IP pools can be installed after installation.

2. In this file, navigate to network.ippool.type and change none to calico. Save the file after you finish.

   network:
     ippool:
       type: calico # Change "none" to "calico".
   

3. Create a cluster using the configuration file:

   ./kk create cluster -f config-sample.yaml
   

Installing on Kubernetes

As you install KubeSphere on Kubernetes, you can enable Pod IP Pools first in the cluster-configuration.yaml file.

1. Download the file cluster-configuration.yaml and edit it.

   vi cluster-configuration.yaml
   

2. In this local cluster-configuration.yaml file, navigate to network.ippool.type and enable it by changing none to calico. Save the file after you finish.

   network:
     ippool:
       type: calico # Change "none" to "calico".
   

3. Execute the following commands to start installation:

   kubectl apply -f https://github.com/kubesphere/ks-installer/releases/download/v3.4.1/kubesphere-installer.yaml
   
   kubectl apply -f cluster-configuration.yaml
   

Enable Pod IP Pools After Installation

1. Log in to the console as admin. Click Platform in the upper-left corner and select Cluster Management.

2. Click CRDs and enter clusterconfiguration in the search bar. Click the result to view its detail page.

   Info

   A Custom Resource Definition (CRD) allows users to create a new type of resources without adding another API server. They can use these resources like any other native Kubernetes objects.

3. In Custom Resources, click on the right of ks-installer and select Edit YAML.

4. In this YAML file, navigate to network and change network.ippool.type to calico. After you finish, click OK in the lower-right corner to save the configuration.

   network:
     ippool:
       type: calico # Change "none" to "calico".
   

5. You can use the web kubectl to check the installation process by executing the following command:

   kubectl logs -n kubesphere-system $(kubectl get pod -n kubesphere-system -l 'app in (ks-install, ks-installer)' -o jsonpath='{.items[0].metadata.name}') -f
   

   Note

   You can find the web kubectl tool by clicking in the lower-right corner of the console.

Verify the Installation of the Component

On the Cluster Management page, verify that you can see the Pod IP Pools module under Network.

Thanks for the feedback. If you have a specific question about how to use KubeSphere, ask it on Slack. Open an issue in the GitHub repo if you want to report a problem or suggest an improvement.