Troubleshoot Fission Setup
In this section, we will cover how to troubleshoot your functions and collect information to troubleshoot problems related to Fission.
Check Pods Status and Logs
If the Fission installation doesn’t work for you, you can follow guides below to troubleshoot.
Core Components
All core component should stay in RUNNING state.
If the pod is not in RUNNING state or the RESTARTS counts keep increasing, you can get some useful information with commands.
In most cases, Events shows common errors like wrong image name, and can help you to locate common problems.
$ kubectl -n fission describe pod -f <pod>
If Events doesn’t provide any information, you then need to dump component logs
$ kubectl -n fission logs -f <pod>
For example, here is log from executor which shows that in-Cluster DNS problem (port 53).
error posting to getting service for function: Post http://executor.fission/v2/getServiceForFunction:
dial tcp: lookup executor.fission on 127.0.0.53:53: read udp 127.0.0.1:59676->127.0.0.53:53: read: connection refused
Function Pods
A function pod consists with two containers: Fetcher and Runtime.
Fetcher fetches user function into function pod during specialization stage.
Runtime is a container contains necessary language environment to run user function.
You can filter out function pods you’re interesting in and dump logs as follows.
$ kubectl -n fission-function get pod -l functionName=<fn-name>
You can also add additional labels to filter out pods. Here are some labels you can use.
| Label | Possible Value | Example |
|---|---|---|
| environmentName | environment name | environmentName=go |
| functionName | function name | functionName=hello |
| executorType | poolmgr/newdeploy | executorType=newdeploy |
If you also want to filter out function pod in specific state like RUNNING, try:
$ kubectl -n fission-function get pod -l functionName=<fn-name> \
--field-selector status.phase=Running
Dump logs from containers:
$ kubectl -n fission-function describe pod -f <pod>
$ kubectl -n fission-function logs -f <pod> -c <container>
Builder Pods
The builder pods is similar to function pod but for building user function source code into a deployable package.
$ fission pkg create --env go --src go.zip
Package 'go-zip-5obh' created
$ fission pkg list
NAME BUILD_STATUS ENV
go-zip-5obh running go
Your function won’t work until the package function used turns into succeeded state.
If a package shows state other than succeeded you can retrieve build logs with commands as follows.
$ fission pkg list
NAME BUILD_STATUS ENV
go-zip-a7ns failed go
$ fission pkg info --name go-zip-a7ns
Name: go-zip-a7ns
Environment: go
Status: failed
Build Logs:
Error building deployment package: Internal error - {"artifactFilename":"go-zip-a7ns-tu8wfl-bkkmcd",
"buildLogs":"Building in directory /usr/src/go-zip-a7ns-tu8wfl\n++ basename /packages/go-zip-a7ns-tu8wfl\n+
srcDir=/usr/src/go-zip-a7ns-tu8wfl\n+ trap 'rm -rf /usr/src/go-zip-a7ns-tu8wfl' EXIT\n+ '[' -d /packages/go-zip-a7ns-tu8wfl ']'
\n+ echo 'Building in directory /usr/src/go-zip-a7ns-tu8wfl'\n+ ln -sf /packages/go-zip-a7ns-tu8wfl
/usr/src/go-zip-a7ns-tu8wfl\n+ cd /usr/src/go-zip-a7ns-tu8wfl\n+ '[' -f go.mod ']'\n+ '[' '!' -z 1.12.7 ']'\n+
version_ge 1.12.7 1.12\n++ head -n 1\n++ sort -rV\n++ tr ' ' '\\n'\n++ echo 1.12.7 1.12\n+ test 1.12.7 == 1.12.7\n+
go mod download\n+ go build -buildmode=plugin -i -o /packages/go-zip-a7ns-tu8wfl-bkkmcd .\n#
github.com/fission/fission/examples/go/go-module-example\n./main.go:4:2: imported and not used:
\"fmt\"\n+ rm -rf /usr/src/go-zip-a7ns-tu8wfl\nerror building source package: error waiting for cmd \"build\": exit status 2\n"}
To dump builder logs, you can do:
$ kubectl -n fission-builder get pod -l envName=<env-name>
$ kubectl -n fission-builder describe pod -f <pod>
$ kubectl -n fission-builder logs -f <pod> -c <container>
Dump Logs for Further Help
If steps above cannot help you to solve the problem, you can run support command to dump logs.
$ fission support dump
Then, you can open issue on GitHub and upload the dump file for others to help.