Sometimes, I get errors like “address is already in use” but struggle to find out what’s using that port. This happens especially with loads of stuff running in background like docker, vagrant vms, local server instances, ssh tunnels etc.
Here’s an easy way to figure out whats running on a certain port:
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netstat -vanp tcp | grep 8080 |
The second last column refers to the process using that port.
For example, running that on my mac:
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➜ ~ netstat -vanp tcp | grep 8080 tcp4 0 0 *.8080 *.* LISTEN 65536 65536 5500 0 |
Indicates that process ID 5500 is using port 8080. Doing a process check on that tells me:
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➜ ~ ps -ef | grep 5500 394661014 5500 5443 0 7:15am ?? 0:42.61 /Applications/VirtualBox.app/Contents/MacOS/VBoxHeadless --comment kitchen-awesomevm --startvm b459e3ea-566b-4184-a109-cf97338958aa --vrde config |
Hope this helps!