Expo + linux mint 18.2


I downloaded the .AppImage, ran it and I get the front end, open the project and in the log it says “Project opened… Use Share device”. So it all looks good.

However, when I try to open it just fails straight away, not even the app loading screen.

With the tunnel it just goes red saying cant create a tunnel back to localhost:19001. With LAN it says “Uncaught Error: Packager is not running at http:/…:19001”

Whats confusing me a little is in the expo URL its saying 19000 not 19001. I hazard a guess expo runs 2 servers? one for the logs / connection (19000) at the react native packager on 19001?

If I netstat I can see a running process listening on 19000, but nothing on 19001. If I switch protocol to http in my browser I get a json blob from 19000 in my browser.

Any ideas? The switch to linux solved my adb problems / I get the same errors on my virtual devices as I do on my phone which is nice.

Are there any more logs? I’m thinking /guessing here the package manager is dying / not starting up on 19001 but I cant see any logs.

Thanks for any help.

ah, found a ~/.expo directory with some more logs in, tailing it I see “packager process exited with code 11”

Well that was fun, fathomed out how to run via NPM and it hung when starting react package manager, googled that and found this:


So yeah, “sudo sysctl -w fs.inotify.max_user_watches=10000” fixed the issue, albeit until I reboot. To make it permanent it needs to be set in /etc/sysctl.d directory or /etc/sysctl.conf. Rather than rebooting to apply, “sudo sysctl -p --system” can apply it and then you just need to restart expo / terminal after.

Its also seems a common issue with intellij which is obviously doing alot with files / directory too https://confluence.jetbrains.com/display/IDEADEV/Inotify+Watches+Limit, there’s a bit more info about what the problem is there / how inotify works.

Seems expo tries to either open this all in parallel / doesnt check the package manager actually starts, which suppresses the issue.

But yeah, now it works :slight_smile:

1 Like

nice sleuthing, this is good to know

1 Like