In a world where the Anonymous group is petitioning the US Government to make DDoS attacks a legal means of protest; For internet facing systems the threat of Denial of Service attacks are very real.
The cold harsh reality of DoS attacks are that there is no way to stop them. While there are services out there that are designed to take the brunt of the attack for you these costs a significant amount of money (update: CloudFlare seems pretty decent)....
For todays article I wanted to put together a quick little cheat sheet for some GNU find command examples.
Some of these commands will be basic some will be more advanced, but they all will be useful. As a caveat some commands don't work in all Unix environments and this is especially true with older releases. If you find yourself in one of those situations there is a way to make the find command work you will just need to use different methods like the -exec flag....
Zombies don't just appear in scary movies anymore, sometimes they also appear on your Linux systems; but don't fret they are mostly harmless.
What is a Zombie Process? Before we get started I wanted to first cover what exactly a Zombie process is.
Linux and Unix both have the ability for a process to create a sub process otherwise known as a “Child Process”. Once a process creates a new sub process the first process then becomes a “Parent Process” as it has spawned a child process during its execution....
Access Control Lists aka ACL's are one of those obscure Linux tools that isn't used every day; and if you find yourself using ACL's every day than you probably have a very complicated Linux environment.
A few years ago I had an engineer tell me “Any thing you want to solve with ACL's can be solved with standard unix permissions” and while he may have just been justifying why he didn't know ACL's very well....
Stat is a command that I never knew about until somewhat recently but afterwards have had more and more reasons to use it. When run against a file stat will show detailed information about the file, this information can be extremely useful and I want to highlight some of the information I've found useful from stat.
$ stat rsync.out File: `rsync.out' Size: 696506 Blocks: 1368 IO Block: 4096 regular file Device: fc00h/64512d Inode: 13862 <strong>Links: 1</strong> Access: (0644/-rw-r--r--) Uid: ( 1000/madflojo) Gid: ( 1000/madflojo) Access: 2012-05-21 19:28:00....