docs: ENIs should not be managed by the OS #16186
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When ENIs are managed by services such as NetworkManager or systemd-networkd, it can happen that they interfere with Cilium's configuration. For example, systemd-networkd can remove the ENI IP assigned by Cilium if the carrier is temporarily down, thus breaking SNAT. We previously had a similar section regarding NetworkManager and DHCP in the EKS installation guide, but the EKS guide has since been replaced by the Cilium CLI installation guide. This section here therefore acts as a replacement and states that the devices need to be unmanaged (e.g. disabling DHCP is not enough for systemd-networkd). Signed-off-by: Sebastian Wicki <sebastian@isovalent.com>
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| .. group-tab:: Network Manager |
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For future reference these tabs don't need to be grouped, I think basic tabs would work too. But not an issue and it's not as if we paid a lot of attention to it in the rest of the documentation anyway.
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I actually didn't know that basic tabs existed, thanks for pointing this out! If we ever add an additional tabs section to expand on the required network config on this page, they most likely would be grouped together with the above. So I'll leave them as they are for now.
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When ENIs are managed by services such as NetworkManager or
systemd-networkd, it can happen that they interfere with Cilium's
configuration. For example, systemd-networkd can remove the ENI IP
assigned by Cilium if the carrier is temporarily down, thus breaking
SNAT.
We previously had a similar section regarding NetworkManager and DHCP in
the EKS installation guide, but the EKS guide has since been replaced by
the Cilium CLI installation guide.
This section here therefore acts as a replacement and states that the
devices need to be unmanaged (e.g. disabling DHCP is not enough for
systemd-networkd).