Kind: Helm install prometheus on kind fails to start prometheus-server container

[jpmcb]

What happened:
We've installed kind and want to set up some local end to end testing with prometheus, grafana, and a controller we are working on.

Unfortunately, when installing prometheus with helm 3, the prometheus-server container fails to start.

We used the following command to get the logs from prometheus-server container

kubectl logs prometheus-server-58dbcfd88c-9ncjh -c prometheus-server

And it appears that it is failing to start due to a permission error.

level=info ts=2020-01-10T21:06:41.640Z caller=main.go:330 msg="Starting Prometheus" version="(version=2.15.2, branch=HEAD, revision=d9613e5c466c6e9de548c4dae1b9aabf9aaf7c57)"
level=info ts=2020-01-10T21:06:41.640Z caller=main.go:331 build_context="(go=go1.13.5, user=root@688433cf4ff7, date=20200106-14:50:51)"
level=info ts=2020-01-10T21:06:41.640Z caller=main.go:332 host_details="(Linux 4.9.184-linuxkit #1 SMP Tue Jul 2 22:58:16 UTC 2019 x86_64 prometheus-server-58dbcfd88c-9ncjh (none))"
level=info ts=2020-01-10T21:06:41.640Z caller=main.go:333 fd_limits="(soft=1048576, hard=1048576)"
level=info ts=2020-01-10T21:06:41.641Z caller=main.go:334 vm_limits="(soft=unlimited, hard=unlimited)"
level=error ts=2020-01-10T21:06:41.641Z caller=query_logger.go:85 component=activeQueryTracker msg="Error opening query log file" file=/data/queries.active err="open /data/queries.active: permission denied"
panic: Unable to create mmap-ed active query log

goroutine 1 [running]:
github.com/prometheus/prometheus/promql.NewActiveQueryTracker(0x7fffce4fe95f, 0x5, 0x14, 0x2c635a0, 0xc0006fb500, 0x2c635a0)
        /app/promql/query_logger.go:115 +0x48c
main.main()
        /app/cmd/prometheus/main.go:362 +0x5229

We found this discussion related to the problem https://github.com/prometheus/prometheus/issues/5976
However, the work arounds appear to require changing ownership of various docker host machine files and users.

What you expected to happen:
I expect prometheus-server to start with the kind cluster using helm to install without require configuration of the host machine's docker engine / runtime.

How to reproduce it (as minimally and precisely as possible):

kind create cluster
helm repo update
helm install prometheus stable/prometheus

After the containers come up we run:

kubectl get pods -A

And that yields the following

NAMESPACE     NAME                                             READY   STATUS             RESTARTS   AGE
default       prometheus-alertmanager-5588ffbd-8tvrr           2/2     Running            0          4m3s
default       prometheus-kube-state-metrics-55df7bc849-x9jzk   1/1     Running            0          4m3s
default       prometheus-node-exporter-6c7lj                   1/1     Running            0          4m3s
default       prometheus-pushgateway-84745756cd-pfknh          1/1     Running            0          4m2s
default       prometheus-server-58dbcfd88c-9ncjh               1/2     CrashLoopBackOff   5          4m3s
...

Note that the prometheus-server pod has 1/2 containers ready. The prometheus-server-config-map-reload container is fine but the server container itself is in a crash loop and refuses to start and thus, we are blocked on using the kind cluster for our testing without prometheus.

Environment:

• kind version: v0.6.1 go1.13.4 darwin/amd64
• Kubernetes version: v1.16.3
• Helm version: v3.0.2
• Docker engine version: 19.03.5
• Docker desktop version: 2.1.0.5
• OS: MacOS Catalina 10.15.2

[BenTheElder]

On mobile atm but this is almost definitely due to k8s.io/hostPath backing the volume which doesn't support non-uid-0 writers.
The next kind release will fix this, the fix is already merged but we haven't yet released it

[BenTheElder]

There are some related (closed) issues with more detail.

[jpmcb]

No worries! Thanks for the quick response. We are fine holding off until the next release. I'd be happy to test this out once the next release is out 🚀

[BenTheElder]

should be fixed in https://github.com/kubernetes-sigs/kind/releases/tag/v0.7.0

dupe of https://github.com/kubernetes-sigs/kind/issues/830 https://github.com/kubernetes-sigs/kind/issues/1151 https://github.com/kubernetes-sigs/kind/issues/118

[jpmcb]

Awesome! I've confirmed this works with helm prometheus in the above scenario. Thanks so much for the speedy release

[BenTheElder]

Great!

On Tue, Jan 14, 2020 at 9:01 AM John McBride [e-mail]
wrote:

Awesome! I've confirmed this works with helm prometheus in the above
scenario. Thanks so much for the speedy release

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[AlexsJones]

You guys are the best, I was struggling with this also.

THANK YOU!