VMLINUX

There are instances wherein you want to generate random passwords for setting up MySQL/User credentials or use for kickstarts. There is a very simple random password generator in-built into Red Hat/CentOS. Just run the below command.

# cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 24 | head -n24 | head -n1

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To generate a SHA256 certficate in linux all you need to do is run this openssl command and you will be ready with a PCI compliant cert. This is a standard requirement nowadays in any PCI compliant environment. This is implemented with Apache backend. Run the below command to generate .crt and .key files.

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This a very useful One liner command to insert IP and hostname into /etc/hosts file and is particularly useful when it comes to kickstart scripts wherein you need to have /etc/hosts entry for the newly provisioned VM and get it enrolled to various applications that include Red Hat IDM/ FreeIPA and Puppet to start with.

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Its possible to run a script via Alias command. All you need is to modify the .bashrc and then source the script in the required user profile. Alias commands are very useful when it comes to running shortened versions of commands or a complex script to be run using just a single line of command. Currently I use this to run 2 of my custom scripts for waking up a ESXi server via WOL (Wake-ON-LAN).

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