How to resize tmp / increase tmp partition in cpanel server

systemctl stop cpanel
systemctl stop httpd
systemctl stop lsws  [If you have LiteSpeed Web Server, only then execute this command]
systemctl stop mysql

2. Umount /tmp and /var/tmp:

umount -l /tmp
umount -l /var/tmp

3. Move /usr/tmpDSK file to another location (just in case you’ll need to mount it somewhere else to preserve data):

mv /usr/tmpDSK /usr/tmpDSK_back

4. Modify /scripts/securetmp to set tmpdsksize to desired size:

vi /scripts/securetmp

Now put your tmp size,find bellow variable.

my $tmpdsksize = 3000000

5. Run:

/scripts/securetmp

6. Start cpanel, apache , mysql services:

systemctl start cpanel
systemctl start httpd
systemctl start lsws  [If you have LiteSpeed Web Server, only then execute this command]
systemctl start mysql

Now your server have more size in tmp.