VMLINUX

This article will show you how to generate a CSR request and get it signed on a linux CA (CentOS/Red Hat). Follow this link if you have not already installed and configured CA server. We can run the below command to generate the CSR (Certificate Signing Request).

# mkdir /tmp/certs
# openssl req -new -nodes -sha256 -out certificate_request.csr -newkey rsa:2048 -keyout /tmp/certs/certificate_key.key -extensions v3_req

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Setting up a CA server in Linux is quick and easy and is a direct replacement for Microsoft CA. This article applies to both CentOS/Red Hat 6.x and 7.x versions. Let's start with installing the required packages for the CA server setup.

First need to install openssl.

# yum -y install openssl

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SED is a very powerful utility which allows find and replace/insert text functionality. It should be used with Caution and is recommended to use dry-run before committing the changes. Below are the various commands for text manipulation.

Note: \n = for newline and \t = for TAB space and For dry run just remove "-i" from the command

 Find the pattern and Insert text AFTER

# sed -i 's/.*search 1st Line.*/&\nInsert 2nd line/' file1

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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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