Linux Ask! is a Q & A web site specific for Linux related questions. Questions are collected, answered and audited by experienced Linux users.
Remove packages and config files in Ubuntu
Answer:
If you want to remove a package in Ubuntu, you can use apt-get remove, e.g.
# sudo apt-get remove php5
However, the config files will NOT be removed.
To remove the config files also, you can use apt-get purge, e.g.
# sudo apt-get purge php5
Check which Apache modules are loaded
Answer:
To check which Apache modules are loaded, in RHEL/Fedora/CentOS, type
# httpd -M
In Debian/Ubuntu
# sudo apache2ctl -M
How to change MAC address
Answer:
To change MAC address, you need to take the network interface
# sudo ifconfig eth1 down
Then change it by
# sudo ifconfig eth1 hw ether 00:01:02:03:04:05
How to tell if Apache 2 is using prefork or worker MPM?
Answer:
If you are running in Red Hat Linux/ Fedora/ CentOS
# httpd -V
....
Architecture: 64-bit
Server MPM: Prefork
threaded: no
forked: yes (variable process count)
...
If you are running in Debian/ Ubuntu, you can use apache2 -V, which get the same output as above.
Rescheduling mlocate to run weekly instead of daily
Answer:
As explained before, mlocate is a useful tool for quickly find files on the filesystem based on their name.
When you installed the mlocate, it created a daily cron job under /etc/cron.daily/ which build the database daily. However, it is quite IO intensive when you build the database, and it is not recommended to run the indexing in a production server in such high frequency...it is better to run it weekly or monthly.
E.g. To reschedule the the cron job to run weekly
# mv /etc/cron.daily/mlocate /etc/cron.weekly/
