Use net.Listen func to ensure the port is free #6990

boxjan · 2021-03-25T13:53:56Z

What this PR does / why we need it:

Fro the issue, I meet the problem here #6988 ; and I fixed it after I change the judgment method.

Types of changes

Bug fix (non-breaking change which fixes an issue)
New feature (non-breaking change which adds functionality)
Breaking change (fix or feature that would cause existing functionality to change)

Which issue/s this PR fixes

How Has This Been Tested?

I make a image and deploy it in my cluster which I meet the problem in the issue, then the problem disappeared. I reboot some node, and the problem no happen again.
My image link (docker hub)

Checklist:

My change requires a change to the documentation.
I have updated the documentation accordingly.
I've read the CONTRIBUTION guide
I have added tests to cover my changes.
All new and existing tests passed.

k8s-ci-robot · 2021-03-25T13:53:59Z

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k8s-ci-robot · 2021-03-25T13:54:04Z

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k8s-ci-robot · 2021-03-25T13:54:04Z

Hi @boxjan. Thanks for your PR.

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boxjan · 2021-04-07T16:32:30Z

/assign @ElvinEfendi

boxjan · 2021-04-09T18:15:39Z

/assign @cmluciano

rikatz · 2021-06-27T22:20:18Z

/ok-to-test

rikatz · 2021-06-27T22:23:10Z

internal/net/net.go

@@ -29,12 +29,12 @@ func IsIPV6(ip _net.IP) bool {

 // IsPortAvailable checks if a TCP port is available or not
 func IsPortAvailable(p int) bool {
-	conn, err := _net.Dial("tcp", fmt.Sprintf(":%v", p))
+	ln, err := _net.Listen("tcp", fmt.Sprintf(":%v", p))


Cant it be a problem if we try to bind nginx to a specific IP, but here you check all the interfaces?

https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/configmap/#bind-address <- we should probably check against this address specifically:

If it does not exists, we may try binding to every address

If this exists, then we should try to bind specifically to this address

Yes, you are right, I just did a workaround let it can run in my cluster. I will try to change it under your suggested.

@rikatz but the function was use in init check, so it will change so many things.

hum indeed, this value is in ConfigMap and it's not a flag...

OK, so overall this problem would still happen if we have something listening in the port, I think we can go forward with this one.

rikatz · 2021-07-04T22:19:33Z

/lgtm
/approve
Let's keep an eye in the future if this change brings other problems as I described in the PR review. While that, thanks for the contribution :)

k8s-ci-robot · 2021-07-04T22:19:41Z

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: boxjan, rikatz

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chessman · 2021-08-03T07:20:12Z

Is it possible to backport this PR to 0.48.x?

Co-authored-by: boxjan <[email protected]>

) Co-authored-by: boxjan <[email protected]>

k8s-ci-robot added the cncf-cla: no Indicates the PR's author has not signed the CNCF CLA. label Mar 25, 2021

k8s-ci-robot added needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. size/XS Denotes a PR that changes 0-9 lines, ignoring generated files. labels Mar 25, 2021

k8s-ci-robot requested review from cmluciano and ElvinEfendi March 25, 2021 13:54

use listen to ensure the port is free

bdaf3e5

boxjan force-pushed the master branch from 0c6e69c to bdaf3e5 Compare March 25, 2021 14:08

k8s-ci-robot added cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. and removed cncf-cla: no Indicates the PR's author has not signed the CNCF CLA. labels Mar 25, 2021

boxjan changed the title ~~Use listen to ensure the port is free~~ Use net.Listen func to ensure the port is free Mar 28, 2021

k8s-ci-robot assigned ElvinEfendi Apr 7, 2021

k8s-ci-robot assigned cmluciano Apr 9, 2021

k8s-ci-robot added ok-to-test Indicates a non-member PR verified by an org member that is safe to test. and removed needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. labels Jun 27, 2021

rikatz reviewed Jun 27, 2021

View reviewed changes

k8s-ci-robot assigned rikatz Jul 4, 2021

k8s-ci-robot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Jul 4, 2021

k8s-ci-robot added the approved Indicates a PR has been approved by an approver from all required OWNERS files. label Jul 4, 2021

k8s-ci-robot merged commit 0c685c1 into kubernetes:master Jul 4, 2021

tao12345666333 mentioned this pull request Jul 27, 2021

port 80 is free, but nginx-ingress-controller say already in use #6988

Closed

chessman mentioned this pull request Aug 9, 2021

use listen to ensure the port is free (#6990) #7467

Merged

8 tasks

k8s-ci-robot pushed a commit that referenced this pull request Aug 9, 2021

use listen to ensure the port is free (#6990) (#7467)

af745bd

Co-authored-by: boxjan <[email protected]>

aureq mentioned this pull request Oct 30, 2021

Chart Option bind-address is not honored at startup and causes nginx to fail #7859

Closed

rchshld pushed a commit to joomcode/ingress-nginx that referenced this pull request May 19, 2023

use listen to ensure the port is free (kubernetes#6990) (kubernetes#7467

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) Co-authored-by: boxjan <[email protected]>

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Use net.Listen func to ensure the port is free #6990

Use net.Listen func to ensure the port is free #6990

boxjan commented Mar 25, 2021

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boxjan commented Apr 9, 2021

rikatz commented Jun 27, 2021

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boxjan Jun 28, 2021

boxjan Jun 28, 2021

rikatz Jul 4, 2021

rikatz commented Jul 4, 2021

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chessman commented Aug 3, 2021

Use net.Listen func to ensure the port is free #6990

Use net.Listen func to ensure the port is free #6990

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boxjan commented Mar 25, 2021

What this PR does / why we need it:

Types of changes

Which issue/s this PR fixes

How Has This Been Tested?

Checklist:

k8s-ci-robot commented Mar 25, 2021

k8s-ci-robot commented Mar 25, 2021

k8s-ci-robot commented Mar 25, 2021

boxjan commented Apr 7, 2021

boxjan commented Apr 9, 2021

rikatz commented Jun 27, 2021

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chessman commented Aug 3, 2021