Linux Shtuff

Source: Memcrashed – Major amplification attacks from UDP port 11211

Attackers abuse “memcached” to amplify volumes by an unprecedented factor of 51k. Source: In-the-wild DDoSes use new way to achieve unthinkable sizes

Howdy! When running a script using nohup and piping the output to a logfile, I received this message: nohup: ignoring input and appending output to `nohup.out’ This is simply a notice to let you know that the standard error message will also be sent to standard out which will then be redirect to a log…

Howdy ma Peeps! Long time no post! I recently ran into an issue with a client trying to update OpenJDK to 1.8.0 (using the “yum install java-1.8.0”) to his cPanel server (CenotOS 6.9 WHM v68.0.23) which failed with the error that it requires (Network Security Services) nss >= 3.28.4 (and the server is running nss…

Redis is an open-source, networked, in-memory, key-value data store with optional durability. It is written in ANSI C. It’s a “NoSQL” key-value data store. More precisely, it is a data structure server. To install Redis as daemon on a CentOS/RHEL/cPanel server, complete the following steps cd /usr/local/ wget http://download.redis.io/releases/redis-stable.tar.gz tar -xvzf redis-stable.tar.gz cd redis* make…

Howdy! I won’t be going into a whole lot of detail about sar as this has been documented elsewhere multiple times but basically, SAR stands for System Activity Report and as its name suggests, the sar command is used to collect,report & save CPU, Memory, I/O usage in Unix like operating systems. The SAR command…

As a request comes in, it is denoted in the scoreboard. The scoreboard itself is basically a way to keep track of each incoming, waiting, and completing connections. These connections are broken down into the following types: “_” Waiting for Connection “S” Starting up “R” Reading Request “W” Sending Reply “K” Keepalive (read) “D” DNS…

Recently I came upon an issue on a cPanel server with suPHP as the handler in that, when the cPanel user SSH’s into the server (or connects via sFTP) any file or directory created will have incorrect permissions. Files: 664 Directories 775   I found this was due to a setting in /etc/profile that sets…

Hi! Do you have a client who says that they cannot access their sites/server and insists it’s a network issue, but their IP addresses does not seem to be blocked by csf.deny and their sites are not loading in several parts of the world with a site checker like https://www.site24x7.com/check-website-availability.html or others? Well do I…

Hi all,   I have been noticing quite a few issues relating to the cPanel p0f service crashing and sending e-mail notices to customers. This appears to be related to a recent cPanel update based on early reports. Fortunately, the fix is quite simple and should only require you to run the following commands: /scripts/check_cpanel_rpms…