human
How can I modify the size of a tmpfs filesystem?
gpt
To modify the size of a tmpfs filesystem on Linux, you can use the mount command with the -o (options) flag to adjust the 'size' option. Here are the steps to do that:

1. First, find out the current mounting point of your tmpfs filesystem using the df or mount command:
df -h

or
mount | grep tmpfs


Look for the line with 'tmpfs' in the output, and note down the mount point, such as /dev/shm or /tmp.

2. Unmount the tmpfs filesystem you want to resize, for example:
sudo umount /dev/shm


3. Mount the tmpfs filesystem with the new size. For instance, to set the size to 512MB, use:
sudo mount -t tmpfs -o size=512M tmpfs /dev/shm


Replace /dev/shm with the appropriate mount point and 512M with the desired size.

4. To make the change permanent, update the /etc/fstab file by adding or modifying the tmpfs entry with the new size:
tmpfs /dev/shm tmpfs defaults,size=512M 0 0


Ensure you replace /dev/shm and 512M with the relevant mount point and desired size, respectively. Save the changes and close the file.

5. Verify that the changes are successful with df -h:
df -h


The output should display the updated size for the specified tmpfs filesystem.
human
Thank you. Could you please provide a similar explanation for OpenBSD and FreeBSD?
gpt
Sure! The process of modifying the size of a tmpfs filesystem is slightly different in OpenBSD and FreeBSD.

In OpenBSD, you can modify the size of a tmpfs filesystem by using the mount_tmpfs command with the -s option to specify the new size.

Here's an example command to increase the size of a tmpfs filesystem to 1GB in OpenBSD:

sudo mount_tmpfs -s 1g /tmp

In this command, the "-s" option is used to specify the new size in gigabytes. You can replace "/tmp" with the mount point of the tmpfs filesystem that you want to resize.

In FreeBSD, you can modify the size of a tmpfs filesystem by using the mount command with the -o option to specify the new size.

Here's an example command to increase the size of a tmpfs filesystem to 1GB in FreeBSD:

sudo mount -o size=1g tmpfs /tmp

In this command, the "-o" option is used to specify the new size in gigabytes. You can replace "/tmp" with the mount point of the tmpfs filesystem that you want to resize.

Note that in FreeBSD, the "tmpfs" filesystem type is used instead of "tmp". Also, in both OpenBSD and FreeBSD, you may need to adjust the command or options based on your specific system configuration.