Introduction to dig
Made DNS changes? Not sure if they are correct? Don't want to wait for the changes to propagate before discovering a small typo?
No problem. Using the common but often ignored command 'dig', we can query DNS servers for records, specify records and even specify which DNS server to query.
Scanning for rootkits with rkhunter
Continuing with the scanning for rootkits articles, we now concentrate on installing and configuring rkhunter.
Rkhunter works in the same manner as chkrootkit (see this article) but rkhunter also scans for other types of exploits.
Scanning for rootkits with chkrootkit
Up-to-date and secure installations, firewalls, limited ssh access and strong passwords are all basic and essential aspects of security.
But what about the content of your Slice? One method of monitoring content is to scan for rootkits.
System monitoring with top
Using 'top' will give a real-time overview of what is using system resources on your Slice.
Easy configuration and a simple interface allow you to change the emphasis of the summary. For example, choose to concentrate on CPU use or memory use.
Memory management with free
Basic monitoring should be done on a regular basis. This keeps you informed as to the general condition of your server and may warn of impending problems.
This article concentrates on memory management using the command 'free'.
