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feat: add CROC_PORT and CROC_PORTS env vars #1099

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feat: add CROC_PORT and CROC_PORTS env vars #1099

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34bd906
feat: add CROC_PORT and CROC_PORTS env vars
hangone May 7, 2026
48db550
Potential fix for pull request finding
hangone May 7, 2026
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7 changes: 6 additions & 1 deletion Dockerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,12 @@ USER nobody

# Simple TCP health check with nc!
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
CMD nc -z localhost 9009 || exit 1
CMD sh -c ' \
P="${CROC_PORTS:-${CROC_PORT:-9009}}"; \
IFS=,; set -- $P; \
for p in "$@"; do \
nc -z -w 3 localhost "$p" || exit 1; \
done'

ENTRYPOINT ["/croc-entrypoint.sh"]
CMD ["relay"]
6 changes: 6 additions & 0 deletions README.md
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Expand Up @@ -342,6 +342,12 @@ To send files using your custom relay:
croc --pass YOURPASSWORD --relay "myreal.example.com:9009" send [filename]
```

To use custom ports, set `CROC_PORTS` (comma-separated) or `CROC_PORT` (base port):

```bash
docker run -d -p 9010-9011:9010-9011 -e CROC_PORTS='9010,9011' -e CROC_PASS='YOURPASSWORD' docker.io/schollz/croc
```

## Acknowledgements

`croc` has evolved through many iterations, and I am thankful for the contributions! Special thanks to:
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4 changes: 2 additions & 2 deletions src/cli/cli.go
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Expand Up @@ -93,8 +93,8 @@ func Run() (err error) {
Action: relay,
Flags: []cli.Flag{
&cli.StringFlag{Name: "host", Usage: "host of the relay"},
&cli.StringFlag{Name: "ports", Value: "9009,9010,9011,9012,9013", Usage: "ports of the relay"},
&cli.IntFlag{Name: "port", Value: 9009, Usage: "base port for the relay"},
&cli.StringFlag{Name: "ports", Value: "9009,9010,9011,9012,9013", Usage: "ports of the relay", EnvVars: []string{"CROC_PORTS"}},
&cli.IntFlag{Name: "port", Value: 9009, Usage: "base port for the relay", EnvVars: []string{"CROC_PORT"}},
&cli.IntFlag{Name: "transfers", Value: 5, Usage: "number of ports to use for relay"},
},
},
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