[doc][flexible-ipam] Add Flexible IPAM design section #5339
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docs/antrea-ipam.md
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| A StatefulSet Pod's IP will be kept after Pod restarts, when the IP is allocated from the | |||
| annotated IPPool. | |||
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| ### IPAM behaviors | |||
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What is the main purpose and who are the target readers of this section? It looks like design and internal implementation? If so, I would suggest to move it to the last sub-section and name it IPAM design.
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This is to explain how antrea manages IP when FlexibleIPAM feature is enabled.
Moved it to the last sub-section and name it Flexible IPAM design.
docs/antrea-ipam.md
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| #### On Pod create | ||
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| `antrea-agent` will receive a CNI add request, it will check annotations and allocate an IP from | ||
| an IPPool. The IP is a pre-allocated StatefulSet IP, a specified IP or the next available IP in |
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"the corresponding IPPool"
Or, probably we should remove "from an IPPool", given you have another sentence to explain the IP, which seems can be pre-allocated too.
Consider "and allocate an IP for the Pod, which can be a pre-allocated IP StatefulSet IP, a user-specified IP, or the next available IP in the specified IPPool."
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Refactored this section to
`antrea-agent` will receive a CNI add request, and it will check the Antrea IPAM annotations and
allocate an IP for the Pod, which can be a pre-allocated IP StatefulSet IP, a user-specified IP,
or the next available IP in the specified IPPool.
docs/antrea-ipam.md
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| #### On Pod delete | ||
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| `antrea-agent` will receive a CNI del request and release the IP allocation from the IPPool. | ||
| The pre-allocation status won't be changed. |
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Do not understand this sentence. You probably should add more information.
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Changed to:
If the IP is a pre-allocated StatefulSet IP, it will remain pre-allocated status thus the Pod will
get same IP after recreated.
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docs/antrea-ipam.md
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| ### Flexible IPAM design | ||
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| When the `AntreaIPAM` feature gate is enabled, `antrea-controller` will watch IPPool CRs and | ||
| StatefulSets from kube-apiserver, and `antrea-agent` will register the IPAM driver to CNI server. |
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Wrapp kube-apiserver with ''.
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Consider: "activate the Antrea IPAM driver". "register to CNI server" is too much internal details.
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Added `` for kube-apiserver.
Removed
and `antrea-agent` will register the IPAM driver to CNI server
docs/antrea-ipam.md
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| #### On Pod create | ||
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| `antrea-agent` will receive a CNI add request, and it will check the Antrea IPAM annotations and |
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Consider: "it will" -> "it will then"
docs/antrea-ipam.md
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| #### On Pod delete | ||
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| `antrea-agent` will receive a CNI del request and release the IP allocation from the IPPool. | ||
| If the IP is a pre-allocated StatefulSet IP, it will remain pre-allocated status thus the Pod will |
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"it will stay in the pre-allocated status"
Co-authored-by: Lan <luola@vmware.com> Signed-off-by: gran <gran@vmware.com>
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