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Add missing error handling in schema-related code
**What this PR does / why we need it**:
Adds missing error handling to a few places.
**Which issue(s) this PR fixes**
Updates #51457. Still more work to do to fix the issue - client generation code needs to be updated (addressed in https://github.com/kubernetes/kubernetes/pull/64664).
**Release note**:
```release-note
NONE
```
/kind bug
/sig api-machinery
Duplicated masq rules are created by current implementation:
-A KUBE-NODE-PORT -m comment --comment "mark MASQ for
externaltrafficpolicy=cluster" -j KUBE-MARK-MASQ
-A KUBE-NODE-PORT -j KUBE-MARK-MASQ
The last one is always there. So the one inside if statement could
just be removed.
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Always create kubeClusterIPSet in ipvs proxier
**What this PR does / why we need it**:
This PR creates the kubeClusterIPSet ipset even if kube-proxy is started without masqueradeAll and clusterCIDR.
This is necessary to masquerade traffic sent to a clusterIP from the host network namespace. The code to do so is actually already present here: https://github.com/kubernetes/kubernetes/blob/master/pkg/proxy/ipvs/proxier.go#L1220-L1244
However the second else (neither masqueradeAll nor clusterCIDR are set) cannot be used because, before this PR, the initial test `if !proxier.ipsetList[kubeClusterIPSet].isEmpty()` can never return true when masqueradeAll and clusterCIDR are not set because kubeClusterIPSet is empty.
**Which issue(s) this PR fixes**
Fixes#65158
```release-note
Allow access to ClusterIP from the host network namespace when kube-proxy is started in IPVS mode without either masqueradeAll or clusterCIDR flags
```
**Additional comment**
Issue #65158 is closed because ClusterIP access from the host has already fixed in master, except for the case described here (no masquerade flag). More detail in the issue.
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complete ipvs proxier ut
**What this PR does / why we need it**:
Complete ipvs proxier ut:
1. Finish loadbalancer type service test.
2. Add external ip local case.
3. Add UDP type nodeport test.
4. Add TestCleanupLeftovers test.
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes#61390
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
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update ipvs readme file
**What this PR does / why we need it**:
Since some iptables rules that ipvs proxier installed have changed, we need update ipvs readme file.
**Special notes for your reviewer**:
1. fix some error, like nodePort realization.
2. Update iptables rules.
3. Add externalIP
4. Add ipset sets introduction
**Release note**:
```release-note
NONE
```
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Do not need to set SupportIPVSProxyMode after 1.10.
**What this PR does / why we need it**:
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
`SupportIPVSProxyMode` is `true` by default since 1.10, there is no need to set it explicitly any more.
/area ipvs
/cc @m1093782566
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iptables proxier_test typo
**What this PR does / why we need it**:
The definition of `makeTestService` is
```
func makeTestService(namespace, name string, svcFunc func(*api.Service)) api.Service {
...
}
```
but in function `TestClusterIPReject`, use
makeTestService(svcPortName.Namespace, svcPortName.`Namespace`, func(svc *api.Service)
should be
makeTestService(svcPortName.Namespace, svcPortName.`Name`, func(svc *api.Service)
I think it's a typo
/area kube-proxy
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
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fix bug excludeCIDRs was not assign in func NewProxier
**What this PR does / why we need it**:
fix bug excludeCIDRs was not assign in func NewProxier
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
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Init ipvsInterface only when ipvs modules are present
**What this PR does / why we need it**:
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes#61074
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
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Update ipvs docs --- check the prerequisite
**What this PR does / why we need it**:
As #63850 have been merged, the `Prerequisite` should be updated.
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
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fix session affinity for LoadBalancer service with ESIPP
**What this PR does / why we need it**:
fix session affinity for LoadBalancer service with ESIPP
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes#63351
**Special notes for your reviewer**:
In cases that loadbalancer type service with externaltrafficpolicy=local and session-affinity specified, traffic to loadbalancer should only route to backends that in the same node with kube-proxy.
**Release note**:
```release-note
NONE
```
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Enable checking whether ipvs modules are built-in or not
**What this PR does / why we need it**:
Enable checking whether ipvs modules are built-in or not.
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes#63801
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
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Fix localport open with --nodeport-addresses specified
**What this PR does / why we need it**:
Fix localport open with --nodeport-addresses specified.
**Which issue(s) this PR fixes**:
Fixes#61953
**Special notes for your reviewer**:
@ephur
**Release note**:
```release-note
Services can listen on same host ports on different interfaces with --nodeport-addresses specified
```
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Add comments for ipset entries in kube-proxy
**What this PR does / why we need it**:
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes#63584
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
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should use time.Since instead of time.Now().Sub
**What this PR does / why we need it**:
should use time.Since instead of time.Now().Sub
**Special notes for your reviewer**:
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Fix duplicate comment in iptables rule for non-local public-port rule
**What this PR does / why we need it**:
When kubernetes creates an iptable rule for "from-non-local public-port"
rule the rule gets created with two identical comment section.
The function `iptablesNonLocalNodePortArgs` creates a list of arguments
for the rule from iptablesCommonPortalArgs function. This function
already appends the arguments for the rules comments and therefore does
not require appending the comment again.
**Special notes for your reviewer**:
I'm actually not a go programmer at all and have no idea how your tests work.
I doubt that my fix will require adjustements on tests but I'm not 100% sure.
If additional work is needed, I would be glad if someone could point it out to me so I can take care of it.
**Release note**:
```release-note
NONE
```
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Fix problem that ipvs can't work with hostPort
**What this PR does / why we need it**:
Make ipvs proxy mode can work with pods that have hostPort.
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes#61938#60688 and #60305 are related too.
**Special notes for your reviewer**:
IPVS proxier will create dummy device named `kube-ipvs0`, which will maintain all ipvs virtual service address. That means all ipvs maintained clusterIP/externalIP/ingress will be treat as local address.
Then if we have a pod with hostPort, cni will attach this rule to `PREROUTING` chain:
```
KUBE-HOSTPORTS all -- 0.0.0.0/0 0.0.0.0/0 /* kube hostport portals */ ADDRTYPE match dst-type LOCAL
```
so if a service have same port with pod's hostport, then this service can't be access.
In this pr, we added `ACCESS` rule for traffic that aim to ipvs virtual service, to prevent those traffic from be blocked by other rules.
**Release note**:
```release-note
NONE
```
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ipvs proxy bind externalIP and lb ingress.IP to dummy interface
**What this PR does / why we need it**:
IPVS proxy bind externalIP and lb ingress.IP to dummy interface.
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes#59976
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
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Add --ipvs-exclude-cidrs flag to kube-proxy.
**What this PR does / why we need it**:
Add a flag to kube-proxy called --ipvs-exclude-cidrs. This flag allows a user to specify a list of CIDR ranges that should not be included in the cleanup of IPVS rules.
Fixes: #59507
**Release note**:
```
Use --ipvs-exclude-cidrs to specify a list of CIDR's which the IPVS proxier should not touch when cleaning up IPVS rules.
```
/assign @m1093782566
