Use temporary name for netdevice when moving in/out of NS #1002
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adrianchiris
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s1061123
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Mar 11, 2024
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@adrianchiris sorry to review this. It looks good to me almost code. Regarding error handling, I added one comment. could you please take a look into it? Thanks!
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| tempDev, err := setTempName(hostDev) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to rename device %q to temporary name: %v", hostDevName, err) |
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If moveLinkIn() is called with interface Up and failed at here (or later), then the interface goes down and not up. I suppose to add the code to revert (i.e. LinkSetUp()) at error-return case.
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added logic to restore netdev:
- bring back to host namespace
- retore netdev name
- restore link status
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Today, it is not possible to use host-device CNI to move a host device to container namespace if a device already exists in that namespace. e.g when a delegate plugin (such as multus) is used to provide multiple networks to a container, CNI Add call will fail if the targeted host device name already exists in container network namespace. to overcome this, we use a temporary name for the interface before moving it in/out of container network namespace. Signed-off-by: adrianc <[email protected]>
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@s1061123 thx for reviewing. comment addressed. |
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Today, it is not possible to use host-device CNI to move a
host device to container namespace if a device with the same
netdev name already exists in that namespace.
e.g when a delegate plugin (such as multus) is used to provide
multiple networks to a container, CNI Add call will fail if
the targeted host device name already exists in container network
namespace.
to overcome this, we use a temporary name for the interface before
moving it in/out of container network namespace.