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Published 20 hours ago • verified publisher icon istio

use correct order of operations in termination_drain_duration description

Open alam0rt opened this issue 3 years ago • 7 comments

Description of problem

While we were testing the terminationDrainDuration config (by way of pod annotation), we realised the observed behaviour was different than what is described in the documentation.

For example we set the pod's termination grace period to 30s and also the terminationDrainDuration to 30s. We observe that the proxy allows curl to continue establishing connections up until SIGKILL is sent.

➜ kubectl run curl --image=radial/busyboxplus:curl -i --tty --rm
If you don't see a command prompt, try pressing enter.
[ root@curl:/ ]$ while true; do curl google.com; sleep 1; done
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Session ended, resume using 'kubectl attach curl -c curl -i -t' command when the pod is running
pod "curl" deleted

Here we have set the terminationDrainDuration to 15s, while keeping the pod's at 30s:

# while true; do curl google.com; sleep 1; done
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curl: (7) Failed to connect to google.com port 80: Connection refused
curl: (7) Failed to connect to google.com port 80: Connection refused
curl: (7) Failed to connect to google.com port 80: Connection refused
curl: (7) Failed to connect to google.com port 80: Connection refused
curl: (7) Failed to connect to google.com port 80: Connection refused
curl: (7) Failed to connect to google.com port 80: Connection refused
curl: (7) Failed to connect to google.com port 80: Connection refused
curl: (7) Failed to connect to google.com port 80: Connection refused
curl: (7) Failed to connect to google.com port 80: Connection refused
curl: (7) Failed to connect to google.com port 80: Connection refused
curl: (7) Failed to connect to google.com port 80: Connection refused
curl: (7) Failed to connect to google.com port 80: Connection refused
curl: (7) Failed to connect to google.com port 80: Connection refused
curl: (7) Failed to connect to google.com port 80: Connection refused
curl: (7) Failed to connect to google.com port 80: Connection refused
command terminated with exit code 137

With a curl running every 1s, we can observe that for 15s we experience connection refused. Based off of this, I think it is safe to assume that the terminationDrainDuration increases the amount of time before envoy blocks the application from making requests.

Thanks to @senior88oqz for doing most of the debugging!

alam0rt avatar Jul 07 '21 07:07 alam0rt

Hi @alam0rt. Thanks for your PR.

I'm waiting for a istio member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

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istio-testing avatar Jul 07 '21 07:07 istio-testing

Thanks for the comprehensive debugging!

/ok-to-test

craigbox avatar Jul 07 '21 09:07 craigbox

By the way, in the future, the html file are auto generated from the corresponding .proto file. You should modify that file then run make gen. Thanks for the PR!

howardjohn avatar Jul 07 '21 14:07 howardjohn

/retest

alam0rt avatar Jul 08 '21 00:07 alam0rt

Thanks for getting back to me and clarifiying @howardjohn and @craigbox.

I've tweaked the wording a bit to include envoy's language.

As an aside, I had trouble running make gen and had to manually download buf and hack ./common/scripts/setup_env.sh by adding CONDITIONAL_HOST_MOUNTS+="--mount type=bind,source=${HOME}/buf,destination=/usr/bin/buf,readonly " as without:

./clean.sh
./gen.sh
Syncing ./networking/v1beta1/destination_rule.proto from networking/v1alpha3/destination_rule.proto
Syncing ./networking/v1beta1/gateway.proto from networking/v1alpha3/gateway.proto
Syncing ./networking/v1beta1/service_entry.proto from networking/v1alpha3/service_entry.proto
Syncing ./networking/v1beta1/sidecar.proto from networking/v1alpha3/sidecar.proto
Syncing ./networking/v1beta1/virtual_service.proto from networking/v1alpha3/virtual_service.proto
Syncing ./networking/v1beta1/workload_entry.proto from networking/v1alpha3/workload_entry.proto
./gen.sh: line 23: buf: command not found
make[1]: *** [Makefile.core.mk:37: gen-proto] Error 127
make: *** [gen] Error 2

thanks :)

alam0rt avatar Jul 08 '21 00:07 alam0rt

/retest

howardjohn avatar Jul 08 '21 00:07 howardjohn

@alam0rt: PR needs rebase.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

istio-testing avatar Dec 16 '22 22:12 istio-testing

CLA Missing ID CLA Not Signed

  • :x: The email address for the commit (3a4511ac90edc5e1386f8b9599746598adb9c413, 21e90f4129aaa31a438fffa44a423e57fd727b99, ab43ab1723d1fc6de809127b52e2e5c146bd0936, 4d1d47015de1a850eca120e2c5166c7e5d222a7a) is not linked to the GitHub account, preventing the EasyCLA check. Consult this Help Article and GitHub Help to resolve. (To view the commit's email address, add .patch at the end of this PR page's URL.) For further assistance with EasyCLA, please submit a support request ticket.

linux-foundation-easycla[bot] avatar May 15 '24 23:05 linux-foundation-easycla[bot]

@alam0rt: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name Commit Details Required Rerun command
gencheck_api 4d1d47015de1a850eca120e2c5166c7e5d222a7a link true /test gencheck
build_api 4d1d47015de1a850eca120e2c5166c7e5d222a7a link true /test build
release-notes_api 4d1d47015de1a850eca120e2c5166c7e5d222a7a link false /test release-notes

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istio-testing avatar May 15 '24 23:05 istio-testing

/close

craigbox avatar May 15 '24 23:05 craigbox