Traefik crashes when calling Rancher's APIs.

[patriziotufarolo]

What version of Traefik are you using?

Version:      v1.2.3
Codename:     morbier
Go version:   go1.7.5
Built:        2017-04-13_07:21:10PM
OS/Arch:      linux/amd64

What is your environment & configuration (arguments, toml...)?

{
 "GraceTimeOut": 10,
 "Debug": false,
 "CheckNewVersion": true,
 "AccessLogsFile": "",
 "TraefikLogsFile": "",
 "LogLevel": "ERROR",
 "EntryPoints": {
  "http": {
   "Network": "",
   "Address": ":80",
   "TLS": null,
   "Redirect": null,
   "Auth": null,
   "Compress": false
  }
 },
 "Cluster": null,
 "Constraints": [],
 "ACME": null,
 "DefaultEntryPoints": [
  "http"
 ],
 "ProvidersThrottleDuration": 2000000000,
 "MaxIdleConnsPerHost": 200,
 "InsecureSkipVerify": false,
 "Retry": null,
 "Docker": null,
 "File": null,
 "Web": {
  "Address": ":8080",
  "CertFile": "",
  "KeyFile": "",
  "ReadOnly": false,
  "Statistics": null,
  "Metrics": null,
  "Auth": null
 },
 "Marathon": null,
 "Consul": null,
 "ConsulCatalog": null,
 "Etcd": null,
 "Zookeeper": null,
 "Boltdb": null,
 "Kubernetes": null,
 "Mesos": null,
 "Eureka": null,
 "ECS": null,
 "Rancher": {
  "Watch": true,
  "Filename": "",
  "Constraints": null,
  "Endpoint": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
  "AccessKey": "XXXXXXXXXXXXXXXXXXXXXXXXXX",
  "SecretKey": "XXXXXXXXXXXXXXXXXXXXXXXXXX",
  "ExposedByDefault": true,
  "Domain": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
 },
 "ConfigFile": "/etc/traefik/traefik.toml"
}

What did you do?

I am trying to integrate Traefik with Rancher using the configuration file to proxy containers. As you can see I kept my configuration as simple as possibile, basing on the one provided in the documentation.
This issue is related to #1218
but for everyone of them seems to have solved; of course this is not my case :D

The Rancher version i'm currently using is 1.5.9 (stable).

defaultEntryPoints = ["http"]
[entryPoints]
  [entryPoints.http]
  address = ":80"
[web]
address = ":8080"
[rancher]
domain = "XXX"
ExposedByDefault = true
Endpoint = "http://XXX/v1"
AccessKey = "XXX"
SecretKey = "XXX"

What did you expect to see?

I expect to see traefik working

What did you see instead?

ERRO[2017-05-16T16:54:16Z] Error in Go routine: runtime error: invalid memory address or nil pointer dereference
goroutine 57 [running]:
runtime/debug.Stack(0x4e837f, 0xc42000c2c0, 0x1db66d3)
        /usr/local/go/src/runtime/debug/stack.go:24 +0x79
runtime/debug.PrintStack()
        /usr/local/go/src/runtime/debug/stack.go:16 +0x22
github.com/containous/traefik/safe.defaultRecoverGoroutine(0x1af0560, 0xc42000a040)
        /go/src/github.com/containous/traefik/safe/routine.go:147 +0x7d
github.com/containous/traefik/safe.GoWithRecover.func1.1(0x1eb3a50)
        /go/src/github.com/containous/traefik/safe/routine.go:138 +0x57
panic(0x1af0560, 0xc42000a040)
        /usr/local/go/src/runtime/panic.go:458 +0x243
github.com/containous/traefik/provider.parseRancherData(0xc42034e300, 0x14, 0x20, 0xc42046ea00, 0x2f, 0x40, 0xc42034ee00, 0x14, 0x20, 0x2bc8032d, ...)
        /go/src/github.com/containous/traefik/provider/rancher.go:373 +0x298
github.com/containous/traefik/provider.(*Rancher).Provide.func1.1(0xc4203546c0, 0x42b488)
        /go/src/github.com/containous/traefik/provider/rancher.go:236 +0x217
github.com/containous/traefik/vendor/github.com/cenk/backoff.RetryNotify(0xc4203e2e60, 0x2a9cb00, 0xc4201895e0, 0x1eb39f0, 0xc420490f48, 0x65f19f)
        /go/src/github.com/containous/traefik/vendor/github.com/cenk/backoff/retry.go:32 +0x3f
github.com/containous/traefik/provider.(*Rancher).Provide.func1()
        /go/src/github.com/containous/traefik/provider/rancher.go:280 +0x132
github.com/containous/traefik/safe.GoWithRecover.func1(0x1eb3a50, 0xc4203e2e40)
        /go/src/github.com/containous/traefik/safe/routine.go:141 +0x4d
created by github.com/containous/traefik/safe.GoWithRecover
        /go/src/github.com/containous/traefik/safe/routine.go:142 +0x49

Thank you

[ldez]

could you try with 1.3.0-rc2?

[patriziotufarolo]

Same result with

Version:      v1.3.0-rc2
Codename:     raclette
Go version:   go1.8.1
Built:        2017-05-16_04:19:54PM
OS/Arch:      linux/amd64

[SantoDE]

Could you verify that you not set the Service Labels to the traefik Service in Rancher? If they are set, try removing them please :)

[patriziotufarolo]

@SantoDE I am currently running traefik with "docker run" without labels on my own laptop, pointing to my remote rancher setup.
The command I'm issuing is
docker run --rm -p 8080:8080 -p 80:80 -t -i -v $(pwd)/traefik-rancher.toml:/etc/traefik/traefik.toml traefik:1.3.0-rc2
where traefik-rancher.toml is the file provided above

[SantoDE]

Could you try with the debug log Level and paste the log please? :)

[patriziotufarolo]

Here is the output of
docker run --rm -p 8080:8080 -p 80:80 -t -i -v (pwd)/traefik-rancher.toml:/etc/traefik/traefik.toml traefik:1.3.0-rc2 --logLevel=debug

INFO[2017-05-16T19:01:07Z] Traefik version v1.3.0-rc2 built on 2017-05-16_04:19:54PM
INFO[2017-05-16T19:01:07Z] Using TOML configuration file /etc/traefik/traefik.toml
DEBU[2017-05-16T19:01:07Z] Global configuration loaded {"GraceTimeOut":10000000000,"Debug":false,"CheckNewVersion":true,"AccessLogsFile":"","TraefikLogsFile":"","LogLevel":"debug","EntryPoints":{"http":{"Network":"","Address":":80","TLS":null,"Redirect":null,"Auth":null,"Compress":false}},"Cluster":null,"Constraints":[],"ACME":null,"DefaultEntryPoints":["http"],"ProvidersThrottleDuration":2000000000,"MaxIdleConnsPerHost":200,"IdleTimeout":180000000000,"InsecureSkipVerify":false,"Retry":null,"HealthCheck":{"Interval":30000000000},"Docker":null,"File":null,"Web":{"Address":":8080","CertFile":"","KeyFile":"","ReadOnly":false,"Statistics":null,"Metrics":null,"Path":"","Auth":null},"Marathon":null,"Consul":null,"ConsulCatalog":null,"Etcd":null,"Zookeeper":null,"Boltdb":null,"Kubernetes":null,"Mesos":null,"Eureka":null,"ECS":null,"Rancher":{"Watch":true,"Filename":"","Constraints":null,"Endpoint":"XXX","AccessKey":"XXX","SecretKey":"XXX","ExposedByDefault":true,"Domain":"XXX","RefreshSeconds":15,"EnableServiceHealthFilter":false},"DynamoDB":null}
INFO[2017-05-16T19:01:07Z] Preparing server http &{Network: Address::80 TLS:<nil> Redirect:<nil> Auth:<nil> Compress:false}
INFO[2017-05-16T19:01:07Z] Starting provider *server.WebProvider {"Address":":8080","CertFile":"","KeyFile":"","ReadOnly":false,"Statistics":null,"Metrics":null,"Path":"","Auth":null}
INFO[2017-05-16T19:01:07Z] Starting provider *rancher.Provider {"Watch":true,"Filename":"","Constraints":null,"Endpoint":"XXX","AccessKey":"XXXX","SecretKey":"XXX","ExposedByDefault":true,"Domain":"XXX","RefreshSeconds":15,"EnableServiceHealthFilter":false}
INFO[2017-05-16T19:01:07Z] Starting server on :80
DEBU[2017-05-16T19:01:09Z] first container len: %!i(int=20)
ERRO[2017-05-16T19:01:09Z] Error in Go routine: runtime error: invalid memory address or nil pointer dereference
goroutine 65 [running]:
runtime/debug.Stack(0x76303f, 0xc4200103c0, 0x1fb48d6)
        /usr/local/go/src/runtime/debug/stack.go:24 +0x79
runtime/debug.PrintStack()
        /usr/local/go/src/runtime/debug/stack.go:16 +0x22
github.com/containous/traefik/safe.defaultRecoverGoroutine(0x1ca5580, 0x2e97010)
        /go/src/github.com/containous/traefik/safe/routine.go:148 +0x7d
github.com/containous/traefik/safe.GoWithRecover.func1.1(0x2028be0)
        /go/src/github.com/containous/traefik/safe/routine.go:139 +0x57
panic(0x1ca5580, 0x2e97010)
        /usr/local/go/src/runtime/panic.go:489 +0x2cf
github.com/containous/traefik/provider/rancher.parseRancherData(0xc4201f6800, 0x14, 0x20, 0xc4205cc000, 0x2f, 0x40, 0xc420742d00, 0x14, 0x20, 0x3a4cccfa, ...)
        /go/src/github.com/containous/traefik/provider/rancher/rancher.go:391 +0x2a1
github.com/containous/traefik/provider/rancher.(*Provider).Provide.func1.1(0xc4202da000, 0xc4202e4000)
        /go/src/github.com/containous/traefik/provider/rancher/rancher.go:253 +0x211
github.com/containous/traefik/vendor/github.com/cenk/backoff.RetryNotify(0xc420242020, 0x2d907c0, 0xc4202e4000, 0x2028bc0, 0x0, 0xc420660f98)
        /go/src/github.com/containous/traefik/vendor/github.com/cenk/backoff/retry.go:37 +0x88
github.com/containous/traefik/provider/rancher.(*Provider).Provide.func1()
        /go/src/github.com/containous/traefik/provider/rancher/rancher.go:297 +0x132
github.com/containous/traefik/safe.GoWithRecover.func1(0x2028be0, 0xc420242000)
        /go/src/github.com/containous/traefik/safe/routine.go:142 +0x4d
created by github.com/containous/traefik/safe.GoWithRecover
        /go/src/github.com/containous/traefik/safe/routine.go:143 +0x49

^CINFO[2017-05-16T19:01:11Z] I have to go... interrupt
INFO[2017-05-16T19:01:11Z] Stopping server
DEBU[2017-05-16T19:01:11Z] Waiting 10s seconds before killing connections on entrypoint http...
DEBU[2017-05-16T19:01:11Z] Entrypoint http closed
INFO[2017-05-16T19:01:11Z] Server stopped
INFO[2017-05-16T19:01:11Z] Shutting down
ERRO[2017-05-16T19:01:11Z] Error creating server: http: Server closed

[emilevauge]

The panic occurs at line for key, value := range service.LaunchConfig.Labels {, @SantoDE it seems either service.LaunchConfig or service.LaunchConfig.Labels is nil. Any idea if the fix is easy?

[ldez]

Closed by #1654.