Disable local traffic policy for remote discovery #11257
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Signed-off-by: Alex Leong <[email protected]>
alpeb
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Aug 16, 2023
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When doing remote discovery, filterAddresses() will skip the first section filtering for local addresses. Then if there happens to be a match between the client zone and a target zone then it'll just return those targets. But these are zones from different clusters where, like you said, the resource calculation that determined those hints no longer applies. Should we just return all addresses in this case?
Signed-off-by: Alex Leong <[email protected]>
olix0r
reviewed
Aug 16, 2023
Signed-off-by: Alex Leong <[email protected]>
olix0r
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Aug 16, 2023
alpeb
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This is a release candidate for stable-2.14.0; we encourage you to help trying it out! This edge release contains a number of improvements over the multi-cluster features introduced in the last edge release supporting flat networks. It also hardens the containers security stance by removing write access to the root filesystem. * Enhanced `linkerd multicluster link` to allow clusters to be linked without a gateway ([#11226]) * Added cluster store size gauge metric ([#11256]) * Disabled local traffic policy for remote discovery ([#11257]) * Fixed various innocuous multi-cluster warnings ([#11251], [#11246], [#11253]) * Set `readOnlyRootFilesystem: true` in all the containers, as they don't require write permissions ([#11221]; fixes [#11142]) (thanks @mikutas!)
alpeb
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Aug 16, 2023
This is a release candidate for stable-2.14.0; we encourage you to help trying it out! This edge release contains a number of improvements over the multi-cluster features introduced in the last edge release supporting flat networks. It also hardens the containers security stance by removing write access to the root filesystem. * Enhanced `linkerd multicluster link` to allow clusters to be linked without a gateway ([#11226]) * Added cluster store size gauge metric ([#11256]) * Disabled local traffic policy for remote discovery ([#11257]) * Fixed various innocuous multi-cluster warnings ([#11251], [#11246], [#11253]) * Set `readOnlyRootFilesystem: true` in all the containers, as they don't require write permissions ([#11221]; fixes [#11142]) (thanks @mikutas!)
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When a service has it's internal traffic policy set to "local", we will perform filtering to only return local endpoints, as-per the ForZone hints in the endpoints. However, ForZone calculations do not take resources from remote clusters into account, therefore this type of filtering is not appropriate for remote discovery services.
We explicitly ignore any internal traffic policy when doing remote discovery.