Fernando Aleman fernandoaleman

How to Check Swap Space

There are several ways to check swap space in Linux.

The free command with the -h tag shows the total, available, and used swap space in a human-readable format.

$ free -h

How To Install PHP 5.6 on Ubuntu 22.04

Add php apt repository

$ sudo add-apt-repository -y ppa:ondrej/php

Update repository index

Problem

When using apt to install or update packaged, Ubuntu 22.04 now pops up a Daemons using outdated libraries box.

Solution

To disable this pop up box, edit

Problem

The GPG keys listed for the "MySQL 8.0 Community Server" repository are already installed but they are not correct for this package.

Solution

rpm --import https://repo.mysql.com/RPM-GPG-KEY-mysql-2023

Problem

Installing mysql2 gem errors on Apple silicon M1, M2 or M3 Mac running macOS Sonoma.

Solution

Make sure mysql-client, openssl and zstd are installed on Mac via Homebrew.

Replace mysql-client with whichever mysql package you are using

Problem

If you get the following error, the Mac ulimit is set too low.

/opt/chef-workstation/embedded/lib/ruby/gems/3.1.0/gems/chef-config-18.2.7/lib/chef-config/workstation_config_loader.rb:123:in `pwd': Too many open files - getcwd (Errno::EMFILE)
	from /opt/chef-workstation/embedded/lib/ruby/gems/3.1.0/gems/chef-config-18.2.7/lib/chef-config/workstation_config_loader.rb:123:in `locate_local_config'
	from /opt/chef-workstation/embedded/lib/ruby/gems/3.1.0/gems/chef-config-18.2.7/lib/chef-config/workstation_config_loader.rb:55:in `config_location'
	from /opt/chef-workstation/embedded/lib/ruby/gems/3.1.0/gems/chef-config-18.2.7/lib/chef-config/workstation_config_loader.rb:77:in `load'

Problem

Running systemd commands in Docker for Mac returns the following error:

Failed to get D-Bus connection: No such file or directory

Solution

How To Install and Run ClamAV on CentOS 7

ClamAV is an open-source antivirus. It is used to detect viruses, trojans, and malware.

Install ClamAV

Install EPEL repository

yum install -y epel-release

How To Manually Update Chef Server SSL Certificates

Replace the contents of /var/opt/opscode/nginx/ca/www.yourdomain.com.crt with your ssl combined certificate.

Make sure SSL certificate includes DigiCert ca root certificate

Replace the contents of /var/opt/opscode/nginx/ca/www.yourdomain.com.key with your ssl key.

Reconfigure chef server

	#!/usr/bin/env ruby
	#
	# Ruby script to download a number of files
	# from individual URLs via HTTP/HTTPS/FTP
	# specified in an external file.
	#
	# Author: Tobias Preuss
	# Revision: 2013-04-18 16:26 +0100 UTC
	# License: Creative Commons Attribution-ShareAlike 3.0 Unported