How to increase the size of the cPanel-generated /tmp filesystem – cPanel

Introduction

By default, the size of the cPanel-generated /tmp filesystem is 4GB, or 5% of the /usr filesystem size, whichever is smaller. You may wish to increase the size of this filesystem so it can hold more data.

Procedure

cPanel v130 and newer:

In cPanel v130, we have added a setting under Tweak Settings within the WHM interface.

Warnings

You must reboot your server for this setting to take effect.
Changing this setting will delete the contents of your /tmp partition.

Log into WHM
Navigate to "Home / Server Configuration / Tweak Settings" and select the "System" tab
Locate the setting "Size, in MB, for the /tmp partition secured by securetmp"
Adjust the value from the default of "Use algorithm to determine size" to your desired size
- Please note that this setting is using MB
Click on "Save" at the bottom of the page
Reboot the server for the changes to be applied

cPanel 128 and older:

Warnings

We recommend this procedure only be performed by an advanced system administrator and only during a scheduled dedicated time since it requires temporarily stopping the services that write to /tmp.
This procedure only works on servers on which cPanel has generated /tmp. cPanel-generated /tmp filesystems have /dev/loop in their names, for example:
```
[root@server]# df -h /tmp
Filesystem      Size  Used Avail Use% Mounted on
/dev/loop0      477M  2.4M  449M   1% /tmp
```
If your server's current /tmp filesystem does not contain /dev/loop in its name, the filesystem was created outside by cPanel by the server's operating system or data center, and you will need to seek assistance from your data center with increasing the size of /tmp.
This procedure does not work on servers running in Virtuozzo or VZ environments.

Log in as root, either via SSH, or WHM's Terminal.
Open "/scripts/securetmp" in a text editor
- ```
nano /scripts/securetmp
```
Find and modify the 'tmpdsksize' value to the desired size. For example, this sets the value to 10GB:
- ```
my $tmpdsksize = 10485760
```

Use "#" characters to disable this section of the script:

my $five_percent_of_available = ( $available * 0.05 );
    if ( $five_percent_of_available > $tmpdsksize ) {
        $tmpdsksize = $five_percent_of_available;
    }

my $FOUR_GIG_k = ( 1024 * 1024 * 4 );
    if ( $tmpdsksize > $FOUR_GIG_k ) {
        $tmpdsksize = $FOUR_GIG_k;
  }

After you're complete, the section should look like:

# my $five_percent_of_available = ( $available * 0.05 );
#     if ( $five_percent_of_available > $tmpdsksize ) {
#         $tmpdsksize = $five_percent_of_available;
#     }

# my $FOUR_GIG_k = ( 1024 * 1024 * 4 );
#     if ( $tmpdsksize > $FOUR_GIG_k ) {
#         $tmpdsksize = $FOUR_GIG_k;
#   }

Check which services are currently using /tmp:
- ```
lsof | grep /tmp | grep -v deleted
```

Using the output from lsof, temporarily disable monitoring for the services using /tmp. For example:

whmapi1 configureservice service=cpsrvd enabled=1 monitored=0

whmapi1 configureservice service=mysql enabled=1 monitored=0

whmapi1 configureservice service=httpd enabled=1 monitored=0

Using the output from lsof, stop the services that use /tmp. For example:

```
/scripts/restartsrv_cpsrvd --stop
```
```
/scripts/restartsrv_mysql --stop
```
```
/scripts/restartsrv_httpd --stop
```

Unmount /tmp and /var/tmp:
- ```
umount -l /tmp
```
- ```
umount -l /var/tmp
```
Move /usr/tmpDSK file to another location (in case you need to mount it elsewhere to preserve data):
- ```
mv /usr/tmpDSK{,.$(date +%s)}
```
Run this script to create the larger /tmp filesystem:
- ```
/scripts/securetmp
```

Restart the services you stopped previously. For example:

```
/scripts/restartsrv_cpsrvd --start
```
```
/scripts/restartsrv_mysql --start
```
```
/scripts/restartsrv_httpd --start
```

Re-enable monitoring for the services. For example:

whmapi1 configureservice service=cpsrvd enabled=1 monitored=1

whmapi1 configureservice service=mysql enabled=1 monitored=1

whmapi1 configureservice service=httpd enabled=1 monitored=1

Introduction

Procedure

cPanel v130 and newer:

Warnings

cPanel 128 and older:

Warnings

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