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kubernetes/pkg
Kubernetes Submit Queue 9587272e1e Merge pull request #63319 from soundcloud/always-masquerade-service-vips
Automatic merge from submit-queue (batch tested with PRs 63319, 64248, 64250, 63890, 64233). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Always masquerade node-originating traffic with a service VIP source ip

**What this PR does / why we need it**:
This is a follow up to make IPVS work on systems without cluster-cidr or masquerade-all.
On these systems the best matching network / source IP to reach the service VIP is the service VIP itself - at least for the host network.
The workaround is simple: Everything originating on the host (OUTPUT nat chain) with a source IP that is the VIP should be masqueraded.

The relevant rule change is the first rule in `KUBE-SERVICES`:
```
Chain KUBE-SERVICES (2 references)
 pkts bytes target     prot opt in     out     source               destination         
    0     0 KUBE-MARK-MASQ  all  --  *      *       0.0.0.0/0            0.0.0.0/0            match-set KUBE-CLUSTER-IP src,dst
  104  6240 KUBE-MARK-MASQ  tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcp match-set KUBE-NODE-PORT-TCP dst
```

The matching rule could be stricter by matching src(ip),dst(ip),dst(port) but the src ip will only be selected if the VIP should be reached.

**Which issue(s) this PR fixes**
Fixes #63241

**Special notes for your reviewer**:

**Release note**:
```release-note
NONE
```
2018-05-24 19:46:10 -07:00
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