Verify all ports are free #983
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Found out I had some in use ports, this might be helpful to others starting out as well. Extracted the needed ports from docker-compose.yml using: ``` yq -r '.services[]?.ports[]? // empty' docker-compose.yml | \ grep ':' | \ sed -E 's/^"?([0-9]+):[0-9]+.*"?$/\1/' | \ sort -n | uniq ```
| The environment requires several ports to be free. | ||
| Use `ss` to check if any are in use—no output means they're available: | ||
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| ``` | ||
| ss -tulnp|grep -E ':80|:3000|:4000|:5432|:5678|:8000|:8001|:8080' | ||
| ``` |
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What is ss? It doesn't seem to be a default tool on macos, ubuntu or alpine.
It is a good idea to inform people to check that the ports are free, but the actual numbers written out here are bound to go stale over time. What do you think about rephrasing this to something along the lines off "Make sure you aren't running any software on the ports required by docker-compose.yml" ?
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ss is one of the tools in https://en.wikipedia.org/wiki/Iproute2. I reasoned that's a pretty standard tool. I couldn't find something similar that's available on both macos and ubuntu. Anything older you'd prefer, like netstat or lsof maybe?
I thought about including the script mentioned in the commit message, but for an onboarding tutorial, a bit too verbose, although then always current.
I'll apply your rephrase if we can settle on a tool.
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Ah, didn't know netstat was considered legacy :) I typically use netstat on OSX, but fine to keep ss in this text, maybe with a link to that iproute2 page
Found out I had some in use ports, this might be helpful to others starting out as well.
Extracted the needed ports from docker-compose.yml using: