OCPBUGS-30233: Filter IPs in majority group validation #6094
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@zaneb would this change cover the issue? If not, may I request your advice? |
internal/cluster/cluster.go
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| primaryMachineCIDR := "" | ||
| if network.IsMachineCidrAvailable(cluster) { | ||
| primaryMachineCIDR = network.GetMachineCidrById(cluster, 0) | ||
| } |
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Is there any reason to limit to a single MachineNetwork CIDR here?
This already will not work for dual stack clusters, because CreateL3MajorityGroup() is called for both IPv4 and IPv6, but this only passes the IPv4 MachineNetwork.
#6071 will allow multiple machine networks of each address family as well.
I would prefer to pass all of the MachineNetworks and check if each IP is in any of them.
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Gotcha, I modified it to check IPs across multiple machine networks. I think the function I use to get all of the cluster's machine network CIDRs should encompass both address families?
I have difficulty following the connectivity groups code, but it seems plausible. If we ignore the extra IP addresses at the point where we're reading the inventory then it should work as if those interfaces did not exist, which is what I think we want. |
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This change is incorrect since we don't have machine-networks in multi-node UMN. So there is no reason to limit the connectivity to machine-networks. |
| @@ -482,7 +482,13 @@ func newL3QueryFactory(hosts []*models.Host, family AddressFamily) (hostQueryFac | |||
| if err != nil { | |||
| return nil, err | |||
| } | |||
| value[ip.String()] = true | |||
| ipInCidr, err := IpInCidr(ip.String(), primaryMachineCIDR) | |||
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This misses the whole point of creating connectivity-groups. The connectivity-groups should provide all connectivity information. Then the validation should filter weather it needs L2, L3 or specific networks.
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I see...I couldn't find another place to filter ip addresses 😅 do you know of another place where we can filter them?
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Actually you are right. If we want to limit the addresses this is probably the place.
In general, in UMN any IP from any network can be part of the cluster. Therefore, no machine-networks are required for multi-node UMN.
Since no machine-network should be provided in the install-config, OCP doesn't expect them either.
So even if we limit the addresses we use in connectivity-check, does OCP limit its activity to these addresses?
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Hmm not too sure, @zaneb do you know if OCP will use these addresses? Also if no machine networks are required for UMN then how do we filter them?
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OCP doesn't really seem to use the machine-networks except for validations in the installer.
In UMN hosts are allowed to be in different networks. Because assisted has a limitation of only 1 machine-network, I guess we just allow none to be specified. #6071 removes that limitation. We still don't want any of the machine networks to overlap with e.g. the clusterNetwork or serviceNetwork, so this enables us to do all of the validations.
In any event, the agent installer always passes the machineNetwork(s), even with UMN.
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So this change would work well for both cases where either multiple machine networks are specified or none are specified.
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/test? |
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/test edge-e2e-metal-assisted-none |
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It seems that the test passed, So I wonder where did the machine-networks come from? Needs to be checked. |
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It seems there is something wrong with the connectivity-groups. So there is IPv6 connectivity but there are no IPv6 addresses. |
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/test edge-unit-test |
Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## master #6094 +/- ##
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+ Coverage 68.35% 68.36% +0.01%
==========================================
Files 239 239
Lines 35524 35584 +60
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+ Hits 24283 24328 +45
- Misses 9132 9144 +12
- Partials 2109 2112 +3
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Oh I think it's because of the original condition here https://github.com/openshift/assisted-service/pull/6094/files#diff-e0b0e8e6b4de6465aa429384eadda9ed02b2ceb1300e6b95a2f89b8a0858f658R442 |
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/test edge-unit-test |
https://issues.redhat.com/browse/OCPBUGS-30233 Filter the IP addresses when creating connectivity groups to hosts that belong within the machine network CIDRs (if they exist) to prevent failing "belongs-to-majority" validation. Previously, if the IPs were not filtered, the validation would fail if hosts had IPs on different NICs that couldn't connect to other hosts. These IPs were not used and caused the "belongs-to-majority" validation to fail.
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Modified the filter to only be used if there are machine networks! |
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/retest |
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Right now it actually checks that there are no impossible connections between hosts. That's a very high bar.
Failures could occur if the actual routes set up don't result in traffic going over the network explicitly specified as the machine network, and also don't result in a successful connection over the networks the traffic is actually sent over. But as you said, in standard assisted installations the machine network is not provided anyway. So this change will only affect ABI. |
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It appears that when UMN is enabled (so no VIPs) the interface used for the Node IP is the one that has the default route. |
I believe it needs to be tested |
It is all a matter of what OCP dictates.
There might be other reasons for connectivity failures. Besides, the edge cases need to be tested in order to verify that this change doesn't lead to installation failures.
We currently do not limit adding machine-networks in UMN. We are not aware if the invoker is ABI. |
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/hold |
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Also there's currently a validation that would fail this scenario (UMN, multiple machine nets) assisted-service/internal/cluster/validations/validations.go Lines 825 to 828 in 1795995 No more than one machine network can be defined if it's not dual-stack |
If the nodes can talk to each other on their kubelet IPs then OCP will be happy. |
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@CrystalChun: This pull request references Jira Issue OCPBUGS-30233. The bug has been updated to no longer refer to the pull request using the external bug tracker. In response to this:
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https://issues.redhat.com/browse/OCPBUGS-30233
Filter the IP addresses when creating connectivity groups to
hosts that belong within the machine network CIDRs
(if they exist) to prevent failing "belongs-to-majority"
validation. Previously, if the IPs were not filtered,
the validation would fail if hosts had IPs on different
NICs that couldn't connect to other hosts. These IPs
were not used and caused the "belongs-to-majority"
validation to fail.
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/cc @zaneb