search

kubernetes / examples

Kubernetes application example tutorials
Apache License 2.0
6.21k stars 4.54k forks source link

Following guestbook-go setup - PANIC: dial tcp: lookup redis-slave on 172.21.0.10:53: no such host #447

Closed davidhadas closed 1 year ago

davidhadas commented 2 years ago

Following the instructions of guestbook-go setup, the go app failed since it tried to resolve "redis-slave" See https://github.com/kubernetes/examples/issues/437

The image uses https://github.com/kubernetes/kubernetes/blob/e8c167a115ec662726904265d17f75a6d79d78d8/examples/guestbook-go/_src/main.go#L79 resulting in an attempt to resolve "redis-slave"

This is reflected in the log (see below) And results in the message "Waiting for database connection..." on the browser page

Details

Following the instructions, all pods are running:

$ kubectl get pods NAME READY STATUS RESTARTS AGE guestbook-2sfpn 1/1 Running 0 29m guestbook-4l7cr 1/1 Running 0 29m guestbook-czf7n 1/1 Running 0 29m redis-master-wxt7w 1/1 Running 0 32m redis-replica-7tvv5 1/1 Running 0 32m redis-replica-c6qtb 1/1 Running 0 32m

$ kubectl get services NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE guestbook LoadBalancer 172.21.14.199 ** 3000:30122/TCP 28m redis-master ClusterIP 172.21.157.148 6379/TCP 32m redis-replica ClusterIP 172.21.173.21 6379/TCP 32m

connecting via browser shows "Waiting for database connection..."

kubectl logs guestbook-2sfpn

[negroni] listening on :3000 [negroni] Started GET / [negroni] Completed 200 OK in 891.696µs [negroni] Started GET /style.css [negroni] Completed 200 OK in 847.749µs [negroni] Started GET /favicon.ico [negroni] Completed 404 Not Found in 214.807µs [negroni] Started GET /lrange/guestbook [negroni] PANIC: dial tcp: lookup redis-slave on 172.21.0.10:53: no such host goroutine 20 [running]: github.com/codegangsta/negroni.(Recovery).ServeHTTP.func1(0x7fe02a89aa68, 0xc82006cb80, 0xc8200dad20) /go/src/github.com/codegangsta/negroni/recovery.go:34 +0xe9 panic(0x7a8c60, 0xc820094dc0) /usr/local/go/src/runtime/panic.go:426 +0x4e9 main.HandleError(0x6e2780, 0xc8200dbe80, 0x7fe02a89af58, 0xc820094dc0, 0x0, 0x0) /go/src/github.com/GoogleCloudPlatform/kubernetes/examples/guestbook-go/_src/main.go:71 +0x59 main.ListRangeHandler(0x7fe02a89aa68, 0xc82006cb80, 0xc8200ea540) /go/src/github.com/GoogleCloudPlatform/kubernetes/examples/guestbook-go/_src/main.go:38 +0x187 net/http.HandlerFunc.ServeHTTP(0x8a8278, 0x7fe02a89aa68, 0xc82006cb80, 0xc8200ea540) /usr/local/go/src/net/http/server.go:1618 +0x3a github.com/gorilla/mux.(Router).ServeHTTP(0xc820094460, 0x7fe02a89aa68, 0xc82006cb80, 0xc8200ea540) /go/src/github.com/gorilla/mux/mux.go:103 +0x270 github.com/codegangsta/negroni.Wrap.func1(0x7fe02a89aa68, 0xc82006cb80, 0xc8200ea540, 0xc8200db8a0) /go/src/github.com/codegangsta/negroni/negroni.go:41 +0x50 github.com/codegangsta/negroni.HandlerFunc.ServeHTTP(0xc8200dadc0, 0x7fe02a89aa68, 0xc82006cb80, 0xc8200ea540, 0xc8200db8a0) /go/src/github.com/codegangsta/negroni/negroni.go:24 +0x44 github.com/codegangsta/negroni.middleware.ServeHTTP(0x7fe02a899758, 0xc8200dadc0, 0xc8200dae40, 0x7fe02a89aa68, 0xc82006cb80, 0xc8200ea540) /go/src/github.com/codegangsta/negroni/negroni.go:33 +0xaa github.com/codegangsta/negroni.(middleware).ServeHTTP-fm(0x7fe02a89aa68, 0xc82006cb80, 0xc8200ea540) /go/src/github.com/codegangsta/negroni/negroni.go:33 +0x53 github.com/codegangsta/negroni.(Static).ServeHTTP(0xc820073770, 0x7fe02a89aa68, 0xc82006cb80, 0xc8200ea540, 0xc8200db780) /go/src/github.com/codegangsta/negroni/static.go:49 +0x2e0 github.com/codegangsta/negroni.middleware.ServeHTTP(0x7fe02a899730, 0xc820073770, 0xc8200dae20, 0x7fe02a89aa68, 0xc82006cb80, 0xc8200ea540) /go/src/github.com/codegangsta/negroni/negroni.go:33 +0xaa github.com/codegangsta/negroni.(middleware).ServeHTTP-fm(0x7fe02a89aa68, 0xc82006cb80, 0xc8200ea540) /go/src/github.com/codegangsta/negroni/negroni.go:33 +0x53 github.com/codegangsta/negroni.(Logger).ServeHTTP(0xc820090078, 0x7fe02a89aa68, 0xc82006cb80, 0xc8200ea540, 0xc8200db740) /go/src/github.com/codegangsta/negroni/logger.go:25 +0x1f4 github.com/codegangsta/negroni.middleware.ServeHTTP(0x7fe02a899708, 0xc820090078, 0xc8200dae00, 0x7fe02a89aa68, 0xc82006cb80, 0xc8200ea540) /go/src/github.com/codegangsta/negroni/negroni.go:33 +0xaa github.com/codegangsta/negroni.(middleware).ServeHTTP-fm(0x7fe02a89aa68, 0xc82006cb80, 0xc8200ea540) /go/src/github.com/codegangsta/negroni/negroni.go:33 +0x53 github.com/codegangsta/negroni.(Recovery).ServeHTTP(0xc8200dad20, 0x7fe02a89aa68, 0xc82006cb80, 0xc8200ea540, 0xc8200db720) /go/src/github.com/codegangsta/negroni/recovery.go:45 +0x75 github.com/codegangsta/negroni.middleware.ServeHTTP(0x7fe02a8996e0, 0xc8200dad20, 0xc8200dade0, 0x7fe02a89aa68, 0xc82006cb80, 0xc8200ea540) /go/src/github.com/codegangsta/negroni/negroni.go:33 +0xaa github.com/codegangsta/negroni.(Negroni).ServeHTTP(0xc8200737d0, 0x7fe02a89a9d0, 0xc820075e10, 0xc8200ea540) /go/src/github.com/codegangsta/negroni/negroni.go:73 +0x122 net/http.serverHandler.ServeHTTP(0xc820096500, 0x7fe02a89a9d0, 0xc820075e10, 0xc8200ea540) /usr/local/go/src/net/http/server.go:2081 +0x19e net/http.(conn).serve(0xc820096580) /usr/local/go/src/net/http/server.go:1472 +0xf2e created by net/http.(Server).Serve /usr/local/go/src/net/http/server.go:2137 +0x44e

musaprg commented 2 years ago

I faced the same issue and it is because the build/push of the latest image to GCR isn't kicked somehow, I guess.

There is only one image tagged with v3 which is outdated. ref

bgautrea commented 2 years ago

Ran into this too. As a workaround, you can create a redis-slave service that points to the redis replicas.

{ "kind":"Service", "apiVersion":"v1", "metadata":{ "name":"redis-slave", "labels":{ "app":"redis", "role":"replica" } }, "spec":{ "ports": [ { "port":6379, "targetPort":"redis-server" } ], "selector":{ "app":"redis", "role":"replica" } } }

k8s-triage-robot commented 1 year ago

The Kubernetes project currently lacks enough contributors to adequately respond to all issues and PRs.

This bot triages issues and PRs according to the following rules:

You can:

Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle stale

k8s-triage-robot commented 1 year ago

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues and PRs according to the following rules:

You can:

Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle rotten

k8s-triage-robot commented 1 year ago

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues according to the following rules:

You can:

Please send feedback to sig-contributor-experience at kubernetes/community.

/close not-planned

k8s-ci-robot commented 1 year ago

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

In response to [this](https://github.com/kubernetes/examples/issues/447#issuecomment-1443874823): >The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs. > >This bot triages issues according to the following rules: >- After 90d of inactivity, `lifecycle/stale` is applied >- After 30d of inactivity since `lifecycle/stale` was applied, `lifecycle/rotten` is applied >- After 30d of inactivity since `lifecycle/rotten` was applied, the issue is closed > >You can: >- Reopen this issue with `/reopen` >- Mark this issue as fresh with `/remove-lifecycle rotten` >- Offer to help out with [Issue Triage][1] > >Please send feedback to sig-contributor-experience at [kubernetes/community](https://github.com/kubernetes/community). > >/close not-planned > >[1]: https://www.kubernetes.dev/docs/guide/issue-triage/ Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.