add keadm offline installation

[magichan]

• Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Which issue(s) this PR fixes:

Fixes #

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

feature

• What is the current behavior? (You can also link to an open issue here)

keadm add offline install doc.

• What is the new behavior (if this is a feature change)?

update keadm install chinese part and add offline install

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

no

• Other information:

two commit , one for updating keadm install chinese part, one for adding offline install doc.

[kubeedge-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
To complete the pull request process, please assign fisherxu after the PR has been reviewed.
You can assign the PR to them by writing /assign @fisherxu in a comment when ready.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[magichan]

related kubeedge/kubeedge#5852

[Piwriw]

I remember if it needed a kubeedge/pause image, and I found out via the keadm config images list that it needed a kubeedge/admission image

[magichan]

@Piwriw

After reviewing the code, I found that kubeedge/admission is a KubeEdge image, but it is not installed by keadm.

the kubeedge/admission can only be installed manually by https://github.com/kubeedge/kubeedge/tree/master/build/admission

I add a issue for the problem kubeedge/kubeedge#5904

the doc is about the keadm function. At this moment, kubeedge/admission, which cannot be installed by keadm , can be omitted from the documentation.However, I will also modify the document to explain the situation with kubeedge/admission.

As for the issue with kubeedge/pause, I will respond after completing my research.

[magichan]

@Piwriw the puase image for join operation isn't what must do, based on kubeedge/kubeedge#5309.

Only when the user modifies the configuration parameters of containerd, the keadm join require a pause image.

[kubeedge-bot]

@magichan: PR needs rebase.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[wbc6080]

Is this PR still in working progress? Seemd DCO need to be fixed and also need to rebase the code.