Difference between the EasyApache interfaces in the browser and the command line.
The only difference is that the command line provides more flexible, powerful functionality.
For example, by running.
/usr/local/cpanel/scripts/easyapache –build
You can skip the configuration steps and build Apache immediately.
For a full list of command line arguments, run
/usr/local/cpanel/scripts/easyapache –help
What is the difference between Domain disk space and Hard disk quota?
Domain disk space - a calculation of everything the domain uses disk space for i.e. web, mail, databases, etc.
Hard disk quota - a calculation of disk space used by a domains ftp user account i.e. web files.
Domain disk space
This is how much disk space is used by the entire domain. It is made up of Plesk statistics and includes the amount of disk space taken by web pages, mail accounts, databases and other domain data including options specified in the statistic settings on Server -> Server preferences page in the Plesk CP.
Hard disk quota
Is a file system feature that limits how much disk space can be taken by the files which are owned by a specific system account (either domain FTP user or webuser or subdomain FTP user).
This file system quota cannot be exceeded. If the limit is reached, the system user will not be able to create new files and will receive the error “no more space left on device”.
Reference : http://parallels.com
Difference between ‘mount’ and ‘mount -a’
There is a slight difference between the commands - “mount” and “mount -a”.
1. When you type “mount”, it will display the output of the file “/etc/mtab”.
For example,
# mount
/dev/sda5 on / type ext3 (rw,usrquota)
none on /proc type proc (rw)
none on /sys type sysfs (rw)
none on /dev/pts type devpts (rw,gid=5,mode=620)
usbfs on /proc/bus/usb type usbfs (rw)
/dev/sda1 on /boot type ext3 (rw)
none on /dev/shm type tmpfs (rw)
/dev/sda7 on /home type ext3 (rw,usrquota)
/dev/sda8 on /tmp type ext3 (rw,noexec,nosuid)
/dev/sda3 on /usr type ext3 (rw,usrquota)
/dev/sda2 on /var type ext3 (rw,usrquota)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
/tmp on /var/tmp type none (rw,noexec,nosuid,bind)
The content of the file “/etc/mtab” is:
# cat /etc/mtab
/dev/sda5 / ext3 rw,usrquota 0 0
none /proc proc rw 0 0
none /sys sysfs rw 0 0
none /dev/pts devpts rw,gid=5,mode=620 0 0
usbfs /proc/bus/usb usbfs rw 0 0
/dev/sda1 /boot ext3 rw 0 0
none /dev/shm tmpfs rw 0 0
/dev/sda7 /home ext3 rw,usrquota 0 0
/dev/sda8 /tmp ext3 rw,noexec,nosuid 0 0
/dev/sda3 /usr ext3 rw,usrquota 0 0
/dev/sda2 /var ext3 rw,usrquota 0 0
none /proc/sys/fs/binfmt_misc binfmt_misc rw 0 0
sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw 0 0
/tmp /var/tmp none rw,noexec,nosuid,bind 0 0
2. When you type the command “mount -a”, it will take the output of the file “/etc/fstab”.
# cat /etc/fstab
# This file is edited by fstab-sync - see ‘man fstab-sync’ for details
LABEL=/ / ext3 defaults,usrquota 1 1
LABEL=/boot /boot ext3 defaults 1 2
none /dev/pts devpts gid=5,mode=620 0 0
none /dev/shm tmpfs defaults 0 0
LABEL=/home /home ext3 defaults,usrquota 1 2
none /proc proc defaults 0 0
none /sys sysfs defaults 0 0
LABEL=/tmp /tmp ext3 defaults 1 2
LABEL=/usr /usr ext3 defaults,usrquota 1 2
LABEL=/var /var ext3 defaults,usrquota 1 2
LABEL=SWAP-sda6 swap swap pri=0,defaults 0 0
Note: The file “/etc/mtab” has the entries of temporary partitions such as USB drive. But, the file “/etc/fstab” has the entries of mounted partitions in the server.
Difference in du and df results
We normally see issues where the “du” and “df” outputs different disk space usage.
A common scenario is filling up of /var partition due to log files.
We usually clear the logs and the “du” outputs the expected result whereas “df” still shows the earlier reading.
This is due to the fact that, some user processes keeps the deleted files open. “du” doesn’t show that since the file (if it is removed), or the file contents (if it is cleared) is not there in the current working directory.
“df” will continue to display the previous disk space, until the space is de-allocated. To de-allocate this space either the file descriptor of the file should close or the process should exit.
Therefore you can try restarting the daemons used by these files or reboot the server.
