From here:
hdiutil convert /path/imagefile.dmg -format UDTO -o /path/convertedimage.iso
Enabling ssh, sftp and ftp servers on MacOS
From here, you can enable ssh and sftp servers on MacOS from System Preferences/Sharing, and enabling the ‘Remote Login’ option.
To enable an ftpd server, run:
sudo -s launchctl load -w /System/Library/LaunchDaemons/ftp.plist
MacOS 10.15 Catalina fails to burn bootable cdroms from ISOs
Not likely to impact most people, but occasionally I use an external USB dvd burner to make bootable disks for installing various OSes on older computers.
Previously before Catalina I would right click an ISO and select “Burn Image to…’ and this would work as it has for the past several MacOS releases. Now though when I click this option the menu disappears and nothing happens. A tip here suggested to double click this iso to mount it, and then right click the mounted disk and select “Burn Image’. While this does work to burn to a blank cdrom, the disk is not bootable, it appears to only copy the files to the cdrom and not burn it as a bootable disk, even if the iso is from a bootable disk.
Reading through the above post on the Apple site, this sounds like a bug in Catalina and has been logged.
MongoDB on MacOS Catalina 10.15: “exception in initAndListen: 29 Data directory /data/db not found”
By default, MongoDB usually stores it’s data files when running on MacOS under /data/db. After upgrading to Catalina 10.15, when starting MongoDB I get this error:
STORAGE [initandlisten] exception in initAndListen: 29 Data directory /data/db not found., terminating
According to this question and answer here, Catalina no longer allows apps to read or write to non-standard folders beneath / so you need to move the data files elsewhere. After my upgrade, the files were moved to a ‘Relocated Items/Security’ folder. Moving them into my user dir and then starting up with the suggested:
mongod --dbpath ~/data/db
fixes the issue.