Installing Extra CA Certificates

For Redhat / CentOS / Oracle Linux
Install the certificate in your enviroment using the update-ca-trust command
For Example, Let's Encrypt Certificate(s) trust chain:
  1. Download Active PEM certificate from: and put it in /etc/pki/ca-trust/source/anchors
    Run: # update-ca-trust
  2. Also, you might need to run: # update-ca-trust enable to enable the dynamic generation of the ca-bundle file. By default, it's a static file from the RPM installed.
  3. (man update-ca-trust is your friend!)