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Air-Gapped Upgrade with ks-installer

ks-installer is recommended for users whose Kubernetes clusters were not set up by KubeKey, but hosted by cloud vendors or created by themselves. This tutorial is for upgrading KubeSphere only. Cluster operators are responsible for upgrading Kubernetes beforehand.

Prerequisites

You need to have a KubeSphere cluster running v3.1.x. If your KubeSphere version is v3.0.0 or earlier, upgrade to v3.1.x first.
Read Release Notes for 3.2.1 carefully.
Back up any important component beforehand.
A Docker registry. You need to have a Harbor or other Docker registries. For more information, see Prepare a Private Image Registry.
Supported Kubernetes versions of KubeSphere 3.2.1: v1.19.x, v1.20.x, v1.21.x, and v1.22.x (experimental).

Step 1: Prepare Installation Images

As you install KubeSphere in an air-gapped environment, you need to prepare an image package containing all the necessary images in advance.

Download the image list file images-list.txt from a machine that has access to Internet through the following command:
```
curl -L -O https://github.com/kubesphere/ks-installer/releases/download/v3.2.1/images-list.txt
```
Note

This file lists images under ##+modulename based on different modules. You can add your own images to this file following the same rule. To view the complete file, see Appendix.

Download offline-installation-tool.sh.

curl -L -O https://github.com/kubesphere/ks-installer/releases/download/v3.2.1/offline-installation-tool.sh

Make the .sh file executable.
```
chmod +x offline-installation-tool.sh
```

You can execute the command ./offline-installation-tool.sh -h to see how to use the script:

root@master:/home/ubuntu# ./offline-installation-tool.sh -h
Usage:

  ./offline-installation-tool.sh [-l IMAGES-LIST] [-d IMAGES-DIR] [-r PRIVATE-REGISTRY] [-v KUBERNETES-VERSION ]

Description:
  -b                     : save kubernetes' binaries.
  -d IMAGES-DIR          : the dir of files (tar.gz) which generated by `docker save`. default: ./kubesphere-images
  -l IMAGES-LIST         : text file with list of images.
  -r PRIVATE-REGISTRY    : target private registry:port.
  -s                     : save model will be applied. Pull the images in the IMAGES-LIST and save images as a tar.gz file.
  -v KUBERNETES-VERSION  : download kubernetes' binaries. default: v1.17.9
  -h                     : usage message

Pull images in offline-installation-tool.sh.
```
./offline-installation-tool.sh -s -l images-list.txt -d ./kubesphere-images
```
Note

You can choose to pull images as needed. For example, you can delete ##k8s-images and related images under it in images-list.text if you already have a Kubernetes cluster.

Step 2: Push Images to Your Private Registry

Transfer your packaged image file to your local machine and execute the following command to push it to the registry.

./offline-installation-tool.sh -l images-list.txt -d ./kubesphere-images -r dockerhub.kubekey.local

Note

The domain name is dockerhub.kubekey.local in the command. Make sure you use your own registry address.

Step 3: Download ks-installer

Similar to installing KubeSphere on an existing Kubernetes cluster in an online environment, you also need to download kubesphere-installer.yaml.

Execute the following command to download ks-installer and transfer it to your machine that serves as the taskbox for installation.
```
curl -L -O https://github.com/kubesphere/ks-installer/releases/download/v3.2.1/kubesphere-installer.yaml
```
Verify that you have specified your private image registry in spec.local_registry in cluster-configuration.yaml. Note that if your existing cluster was installed in an air-gapped environment, you may already have this field specified. Otherwise, run the following command to edit cluster-configuration.yaml of your existing KubeSphere v3.1.x cluster and add the private image registry:
```
kubectl edit cc -n kubesphere-system
```
For example, dockerhub.kubekey.local is the registry address in this tutorial, then use it as the value of .spec.local_registry as below:
```
spec:
  persistence:
    storageClass: ""
  authentication:
    jwtSecret: ""
  local_registry: dockerhub.kubekey.local # Add this line manually; make sure you use your own registry address.
```
Save cluster-configuration.yaml after you finish editing it. Replace ks-installer with your own registry address with the following command:
```
sed -i "s#^\s*image: kubesphere.*/ks-installer:.*#        image: dockerhub.kubekey.local/kubesphere/ks-installer:v3.1.0#" kubesphere-installer.yaml
```
Warning

dockerhub.kubekey.local is the registry address in the command. Make sure you use your own registry address.

Step 4: Upgrade KubeSphere

Execute the following command after you make sure that all steps above are completed.

kubectl apply -f kubesphere-installer.yaml

Step 5: Verify Installation

When the installation finishes, you can see the content as follows:

#####################################################
###              Welcome to KubeSphere!           ###
#####################################################

Console: http://192.168.0.2:30880
Account: admin
Password: P@88w0rd

NOTES：
  1. After you log into the console, please check the
     monitoring status of service components in
     the "Cluster Management". If any service is not
     ready, please wait patiently until all components
     are up and running.
  2. Please change the default password after login.

#####################################################
https://kubesphere.io             20xx-xx-xx xx:xx:xx
#####################################################

Now, you will be able to access the web console of KubeSphere through http://{IP}:30880 with the default account and password admin/P@88w0rd.

Note

To access the console, make sure port 30880 is opened in your security group.

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