Trusting a self-signed CA certificate

Follow this simple steps to make your OS to trust a self-signed Certificate Authority

Red Hat / CentOS / RockyOS

Copy the CA file to /etc/pki/ca-trust/source/anchors/ and update with sudo update-ca-trust

cp my-self-signed-ca.cer /etc/pki/ca-trust/source/anchors/
sudo update-ca-trust

Ubuntu

Copy the CA file to /usr/local/share/ca-certificates and update with sudo update-ca-certificates

cp my-self-signed-ca.cer /usr/local/share/ca-certificates
sudo update-ca-certificates