Add CA cert to local trust store on CentOS, Debian or Ubuntu

add CA cert on CentOS Debian Ubuntu.md

• Open a webpage that uses the CA with Firefox
• Click the lock-icon in the addressbar -> show information -> show certificate
• the certificate viewer will open
• click details and choose the certificate of the certificate-chain, you want to import to CentOS
• click "Export..." and save it as .crt file
• Copy the .crt file to /etc/pki/ca-trust/source/anchors on your CentOS machine
• run update-ca-trust extract
• test it with wget https://thewebsite.org

On debian and ubuntu the directory is /usr/local/share/ca-certificates/ and the command to update is update-ca-certificates