This article demonstrates how to install Vagrant on CentOS 7 and RHEL. Note that as of recently, Vagrant is installed differently. Download it for your OS here “https://www.vagrantup.com/downloads.html”. The following is only if you want to do it the old way. sudo yum install ruby sudo gem install vagrant Find
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Set the inode limit in /etc/fstab for tmpfs on a CentOS or Redhat server
This article explains how to set the inode limit on a tmpfs on a CentOS or RHEL server. The default inode limit may be too small if you intend to store many small files on it. The following will set the tmpfs resource to 2GB with a default inode limit
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Send SSH commands from PHP 5.6 (php56w)
This article explains how to send SSH commands (SSH, SCP, SFTP) to a remote server using php. In this example we have a working php56w installation with Apache. We’re using CentOS 7. SELinux is enabled. Download the libraries: https://sourceforge.net/projects/phpseclib/files/phpseclib1.0.5.zip/download Unzip the files into a new library directory: # Go to
Read moreOpenSSL urgent upgrade notice
The OpenSSL team have released an advisory to upgrade to version 1.1.0c. Read the notice here: “https://www.openssl.org/news/secadv/20161110.txt”. Redhat’s article can be found here: “https://access.redhat.com/security/cve/cve-2016-7054”. Severity: High TLS connections using *-CHACHA20-POLY1305 ciphersuites are susceptible to a DoS attack by corrupting larger payloads. This can result in an OpenSSL crash. This issue
Read moreMigrating Moodle to Enterprise LMS
This article explains how to migrate your Moodle to Enterprise LMS. My objective here is to migrate the entire Moodle including theme, plugins, users and course data from my Moodle to eLMS. I need SSH (command line) access to my Moodle for this to work because i need to backup
Read moreLoad Testing with Siege
This article is a walk-through of how to use Siege to load (or performance) test a website. In this example the target is the Magento application. The question is “how many visitors can the target site handle while keeping page maximum load times below 10 seconds”? There are add-on tools
Read moreAuditors that ask stupid questions | IT
Honestly, the next time i am on the receiving end of an IT audit and am asked if the workstations have antivirus installed, i’ll go crazy! It’s like all auditors who aren’t “real auditors” simply go through the same old questions and fail to ask the questions that matter. I
Read moreDo this every time you log into a Linux server
This is a list of things i do every time i log into a Linux server. It’s habit now and something you might consider doing too. Essentially we want to know who’s on the server, what the server state is and how different it is to normal. Check who’s on
Read moreRsync and the “Argument list too long” problem
If you try to rsync a subset of many files from a single directory, you might get the error “Argument list too long”. Actually, you can get this error with many bash commands. This article explains how to work around it. rsync -avz /images/* cdn.example.com:/images/ -bash: /usr/bin/rsync: Argument list too
Read moreInbound and Outbound SMTP Design for No Spam
Spam starts and ends with us technicians. It’s our servers that get compromised and it’s our servers that receive it at the other end. With this in mind, we need to ensure only “good” email is going out to the Internet and only “good” email coming in from the Internet.
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