Kubernetes Submit Queue 3ccc755f07 Merge pull request #55945 from x13n/master-startup
Automatic merge from submit-queue (batch tested with PRs 55841, 55948, 55945). 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>.

Set -w flag on all iptables calls during master startup

Lack of this flag sometimes causes iptables to return error code 4 (if
other process holds xtables lock). As a result, because of  `set -o errexit`,
whole startup script fails, leaving master in an incorrect state.

This is another occurence of (already closed) https://github.com/kubernetes/kubernetes/issues/7370

**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)*:

**Special notes for your reviewer**:

**Release note**:

```release-note
Bugfix: master startup script on GCP no longer fails randomly due to concurrent iptables invocations.
```
2017-11-18 14:10:17 -08:00
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Kubernetes

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Kubernetes is an open source system for managing containerized applications across multiple hosts, providing basic mechanisms for deployment, maintenance, and scaling of applications.

Kubernetes builds upon a decade and a half of experience at Google running production workloads at scale using a system called Borg, combined with best-of-breed ideas and practices from the community.

Kubernetes is hosted by the Cloud Native Computing Foundation (CNCF). If you are a company that wants to help shape the evolution of technologies that are container-packaged, dynamically-scheduled and microservices-oriented, consider joining the CNCF. For details about who's involved and how Kubernetes plays a role, read the CNCF announcement.


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