Changing /tmp Partition Size on CPanel Server
Today one of my server have its /tmp partition is full and causing problems such as failed MySQL database query or Fantastico stop working because they can't write temporary file. Here is the solution I found on CPanel's forum:
lsof /tmpThen umount /tmp and /var/tmp:
umount -l /tmp umount -l /var/tmp
Then remove the old partition file:
rm -fv /usr/tmpDSK
Then create a new one:
/scripts/securetmp
Recursive chmod for files or directories only
To do a recursive chmod to directories only you can run:
find . -type d -exec chmod 755 {} \;
And for files only:
find . -type f -exec chmod 644 {} \;
Delete Files Older Than n Days
In Linux system you can delete old unused files (usually the session files in /tmp) all at once by running this command:
find /path/to/files* -mtime +5 -exec rm {} \;
this command will delete files which is 5 days old, if you want to change the number of days to 3 days old, then you have to change +5 to +3 and run the command again.
error: kernel image does not exist: /boot/hypervm-xen-vmlinuz
If you have a CentOS Xen Dom0 and experiencing this problem "error: kernel image does not exist: /boot/hypervm-xen-vmlinuz" after upgrading Xen kernel on HyperVM based VPS, here is how to fix it:
Changing Windows Server 2003 Administrator Password
It’s very easy to change Windows Server 2003 Administrator password if you have physical access to the server, you’ll need to press ctrl + alt + del and you’ll get some option buttons such as Lock Computer, Log Off, Shut Down, etc. on that window, click on Change Password to change your Administrator password (user that currently logged in, so you must log in as Administrator before you can change its password).
Xen VPS modprobe: QM_MODULES: Function not implemented
I got this problem on one of Debian VPS when tried to run iptables command
modprobe: QM_MODULES: Function not implemented modprobe: QM_MODULES: Function not implemented modprobe: Can't locate module ip_tables iptables v1.3.6: can't initialize iptables table `filter': iptables who? (do you need to insmod?) Perhaps iptables or your kernel needs to be upgraded.
To fix this you'll need to run these commands:
Meaning of /dev/null 2>&1 in Crontab’s Cron Job
If you use cron job on Linux, some times you want to ignore the output of the command you executed. This can be done by adding “> /dev/null 2>&1” behind the cron job command.
The command is just work want it should be, but I always curious with what does 2>&1 means. The “> /dev/null” is pretty obvious of what it does without much more explanation, it just redirect all the output to /dev/null which in Linux means we don’t care with the output (or sort of, it’s my own definition).
Xen Debian VPS Problem With nash-hotplug Using 100% CPU Resource
Recently I setup a Debian 4.0 VPS using xen image from jailtime.org, once the VM running I noticed that the load goes 1.0 all the time which make the VM very slow. From top command you’ll see the nash-hotplug process is the cause.
First you can kill it by execute the ‘kill -9 <process id>’ command (without the quotes), where <process id> is the process id of nash-hotplug. Then to automate killing the nash process every time you reboot the VPS run these commands: