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Advertise Conmon PID via MAINPID #6689

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Advertise Conmon PID via MAINPID #6689

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goochjj
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@goochjj goochjj commented Jun 19, 2020

When NOTIFY_SOCKET is passed from systemd, we
send MAINPID= so systemd monitors the correct PID.

Imported daemon/ from go-systemd dependency.

Signed-off-by: Joseph Gooch mrwizard@dok.org

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: goochjj
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@openshift-ci-robot openshift-ci-robot added the needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. label Jun 19, 2020
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Hi @goochjj. Thanks for your PR.

I'm waiting for a containers 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.

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/ok-to-test

@openshift-ci-robot openshift-ci-robot added ok-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 19, 2020
@goochjj goochjj mentioned this pull request Jun 19, 2020
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TomSweeneyRedHat
TomSweeneyRedHat reviewed Jun 19, 2020
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libpod/oci_conmon_linux.go Outdated
@@ -37,6 +37,7 @@ import (
"github.com/sirupsen/logrus"
"golang.org/x/sys/unix"
"k8s.io/client-go/tools/remotecommand"
"github.com/coreos/go-systemd/v22/daemon"
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@goochjj gating doesn't like the location of this line, it needs to move up in alpha order. I think to line 32.5

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fixed

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mheon commented Jun 19, 2020

Gating is complaining about gofmt.

@giuseppe PTAL

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Once gating and happy tests are complete
LGTM

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vrothberg reviewed Jun 19, 2020
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This could break existing users. Until now, we deferred all sd notify communication to the container.

The main pid, however, would make sense to communicate as that's not something any process in the container could know.

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vrothberg commented Jun 19, 2020 •
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I'll pass it to @giuseppe :^)

@goochjj goochjj force-pushed the libpod-sd-notify branch 2 times, most recently from 491e018 to f4a93ec Compare June 19, 2020 13:58
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goochjj commented Jun 19, 2020

I'm not sure how to fix the vendor check. When I run the go mod commands locally it deletes many many things.

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goochjj commented Jun 19, 2020

I think I figured it out

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I'm not sure how to fix the vendor check. When I run the go mod commands locally it deletes many many things.

We require go >= 1.1.3. If you're below that, you can run make vendor-in-container

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runc already sends a MAINPID=$PID-CONTAINER, crun doesn't. More in general we are already delegating the sd-notify logic to the OCI runtime.

The safest is probably to override it from Podman once the container is already started (after "start" terminates). Does systemd work fine if you use MAINPID= multiple times?

libpod/oci_conmon_linux.go Outdated Show resolved Hide resolved
@goochjj goochjj force-pushed the libpod-sd-notify branch 2 times, most recently from 23bb7b9 to 03666d3 Compare June 19, 2020 17:02
@goochjj @giuseppe
Advertise Conmon PID via MAINPID
2600763 
When NOTIFY_SOCKET is passed from systemd, we
send MAINPID=<pid of conmon> so systemd monitors the correct PID.
We do this both Before and After the OCI runtime engine start is called.

Imported daemon/ from go-systemd dependency.

Signed-off-by: Joseph Gooch <mrwizard@dok.org>
Co-authored-by: Giuseppe Scrivano <giuseppe@scrivano.org>
@goochjj goochjj mentioned this pull request Jun 19, 2020
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I think we only need to send the MAINPID once in start. It's redundant in create.

Other than that LGTM. @giuseppe WDYT?

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yes I agree. We need only for start, then LGTM

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goochjj commented Jun 22, 2020

yes I agree. We need only for start, then LGTM

I sent it twice, in case runc or crun passes a different MAINPID. conmon happens before OCI runtime, start happens after.

Note also this PR is superceded by #6693

@goochjj goochjj closed this Jun 22, 2020
@edsantiago edsantiago mentioned this pull request Jun 24, 2020
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