Resizing the /tmp folder sometimes is a thing that needs to be done in a particular situation. For instance when you run applications that require more space to process in the temporary folder or when Not enough space on /tmp error message appears.
By default, the operating system set the /tmp size half of RAM size. But we can override it for a temporary (until reboot) and permanently.
Temporary Resize /tmp Folder
We can set the /tmp folder size with following command: mount -o remout,size=NEW_SIZE /tmp. For example, we need to increase /tmp folder to 10 gigabytes, then we can do with command below
$sudo mount -o remount,size=10G /tmp
Run df -h to verify
$df -h Filesystem Size Used Avail Use% Mounted on dev 3.9G 0 3.9G 0% /dev run 3.9G 1.4M 3.9G 1% /run /dev/sda1 120G 95G 25G 80% / tmpfs 3.9G 128M 3.8G 4% /dev/shm tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup tmpfs 10G 23M 10G 1% /tmp tmpfs 786M 16K 786M 1% /run/user/1000
If you need to change the /tmp folder very often, consider to add alias to your ~/.bashrc (for bash user) or .zshrc (for ZSH shell).
To do that, open .zshrc or .bashrc and add this alias code. Customize it according to your style / need.
alias resizetmp="sudo mount -o remount,size=10G /tmp"
Save and reopen your terminal, Now, you can resize tmp folder to 10GB just with this command
If you are not sure which shell you are working on, run echo $0, it will display current shell.
Change /tmp Folder Size Permanently
Of course we can customize the /tmp folder size permanently, that means the size stay the same after reboot. To do so, open /etc/fstab and add this entry
tmpfs /tmp tmpfs rw,nodev,nosuid,size=10G 0 0