Blog ยท Bosun https://bosun.dev/en/blog/ Guides on ports, tunnels, VPN, and Docker networking on macOS. From the team behind Bosun. en-us Docker Desktop eating CPU on your Mac? How to find (and kill) the culprit https://bosun.dev/en/blog/docker-desktop-high-cpu-mac/ https://bosun.dev/en/blog/docker-desktop-high-cpu-mac/ Wed, 15 Jul 2026 00:00:00 GMT Fan spinning and Mac sluggish because of Docker Desktop? Find out if it's Docker overall or one container, and what actually fixes the CPU spike. Docker: "bind: address already in use" on Mac (lsof won't tell you which container) https://bosun.dev/en/blog/docker-port-already-allocated-mac/ https://bosun.dev/en/blog/docker-port-already-allocated-mac/ Wed, 15 Jul 2026 00:00:00 GMT Docker port conflicts on Mac don't show up in lsof the way you'd expect. Find the real container with docker ps, stop it the right way, and stop guessing. ngrok says tunnel already running (ERR_NGROK_108 / ERR_NGROK_334)? Here's the fix https://bosun.dev/en/blog/ngrok-tunnel-already-running-mac/ https://bosun.dev/en/blog/ngrok-tunnel-already-running-mac/ Wed, 15 Jul 2026 00:00:00 GMT Fix ngrok's ERR_NGROK_108 and ERR_NGROK_334 tunnel-already-running errors on Mac: find the orphaned process, kill it, and check what's actually tunneling. Port 3000 already in use on your Mac? Here's how to actually fix it https://bosun.dev/en/blog/port-3000-already-in-use-mac/ https://bosun.dev/en/blog/port-3000-already-in-use-mac/ Wed, 15 Jul 2026 00:00:00 GMT Fix EADDRINUSE and "port already in use" errors on macOS: find the process with lsof, kill it the right way, and stop it from happening again.