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I have installed and updated Debian testing yesterday, and now I see several files on tmpfs:

df -h Sist. Arq. Tam. Usado Disp. Uso% Montado em udev 16G 0 16G 0% /dev tmpfs 128M 4,4M 124M 4% /run /dev/sdc2 456G 149G 285G 35% / tmpfs 16G 0 16G 0% /dev/shm tmpfs 5,0M 8,0K 5,0M 1% /run/lock efivarfs 192K 34K 154K 19% /sys/firmware/efi/efivars tmpfs 1,0M 0 1,0M 0% /run/credentials/systemd-journald.service tmpfs 1,0M 0 1,0M 0% /run/credentials/systemd-udev-load-credentials.service tmpfs 1,0M 0 1,0M 0% /run/credentials/systemd-tmpfiles-setup-dev-early.service tmpfs 1,0M 0 1,0M 0% /run/credentials/systemd-sysctl.service tmpfs 1,0M 0 1,0M 0% /run/credentials/systemd-tmpfiles-setup-dev.service /dev/nvme0n1 233G 20G 214G 9% /mnt/some /dev/sdd2 92G 1,8G 91G 2% /mnt/some2 /dev/sde 3,7T 1,3T 2,4T 35% /mnt/some3 /dev/sda 2,8T 703G 2,1T 26% /mnt/some4 /dev/sdb 17T 1,4T 16T 9% /mnt/some5 /dev/sdc1 511M 4,4M 507M 1% /boot/efi tmpfs 1,0M 0 1,0M 0% /run/credentials/systemd-tmpfiles-setup.service tmpfs 1,0M 0 1,0M 0% /run/credentials/[email protected] tmpfs 3,2G 28K 3,2G 1% /run/user/0`

I already mount /run on a tmpfs using fstab:

# <file system> <mount point> <type> <options> <dump> <pass> tmpfs /run tmpfs defaults,size=128M 0 0

My question is: WHY systemd insists on creating another tmpfs and consuming RAM?  I already mount a /run on a tmpfs!  Why need to mount these /run/credentials mountpoints?  On this specific device, I have 32 GB of RAM, but I have some other old devices that have 512 MB of memory.  And, if possible, a way to disable these auto tmpfs filesystem creations on systemd (/run/credentials/*, especially except /run/user/someone systemd-pam that I already disabled and system have some fails because of that).

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    @ArtemS.Tashkinov it's not ranting, it's a legitimate question. Commented May 28, 2024 at 21:05
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    @ArtemS.Tashkinov "rant" implies rudeness and aggression. The OP is being perfectly calm and civil, calling this a rant is completely out of line. You could simply explain and post an answer instead of throwing names around. There is no expression of opinion either for or against systemd in this post as far as I can tell, just a question about it and how it works. Commented May 29, 2024 at 11:43
  • How much RAM is consumed by those filesystems? Your df output shows that they're all empty. Commented May 30, 2024 at 8:31
  • As I sayed, these server is an example. In other systems that I won't have great amount of RAM I have problem with these approach. Friends, my objective is only discover how to disable these feature and back to old style. If won't have any way to do these I will find another way. Thanks for your help. Commented Jun 3, 2024 at 11:38
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    The question remains: How much RAM is consumed by those filesystems? On any normal system, the total memory in use by all those tmpfs instances should be below 10-20 MB. If you have any tmpfs instances that have more than 50+ MB, then your objective should be to 1) figure out how that amount of data ended up there and 2) maybe disable that specific tmpfs instance – not literally all of them. Commented Jun 8, 2024 at 17:43

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