As system administrator , but also as common user on my PC, one of the more common problem is when a file system got filled up at up at 100% of its size.
So, in this article we’ll see 2 commands that can help us in keeping under control or check the space used in every filesystem and in his directory.
df : report file system disk space usage
du: estimate file space usage Continue reading »
Happy easter to all, what’s better than celebrate this holiday taking a look at what have hidden the programmers in our software ?
A virtual Easter egg is an intentional hidden message, in-joke or feature in a work such as a computer program, web page, video game, movie, book or crossword. The term was coined—according to Warren Robinett—by Atari after they were pointed to the secret message left by Robinett in the game Adventure.
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As comment of the article Knockd, to secure your ports, i’ve received:
“Port knocking is bad idea; a very bad idea.
Port knocking is, in the end, a password. A sniffable one that is subject to man-in-the-middle attacks so you can’t even use one-time-passwords and be secure.
Public/private key pairs and/or one-time-passwords (opie, skey and the like) are the real solutions, along with dynamic monitoring to prevent DOS CPU resource exhaustion attacks. (OpenBSD’s PF incorporates a nice solution, as does the iptables with fail2ban/denyhosts/etc. Even swatch can work wonders.)”
Well, in my opinion knockd it’s a layer of security, perhaps thin but still can save you from some brute force script and so it adds a bit of security to your solution, in this article i’ll show you fail2ban that add another layer of security to our network services.
Today, i’ll show you how to use knockd to improve the security of your linux server, the more common use that i’ve saw so far is: “i’d like to connect on port 22 (ssh) but i don’t want to leave to port open for everyone..and i’ve a dynamic IP”. In these cases you can close the ports and use knockd to knock on the ports of your Linux box and let you in.
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NagiosQL is a web based administration tool for Nagios 2.x, 3.x and Icinga 1.x. It helps you to easily build a complex configuration with all options, manage and use them. NagiosQL is based on a webserver with PHP, MySQL and local file or remote access to the Nagios configuration files via ssh or ftp.
The product relies on a Mysql DB which keep all the configurations for Nagios, there is also the option “dump to disk” which writes all configuration files of Nagios, you can also import from Nagios configuration text files to the database.