warning: every year need re-issue certificate
1. upload new certificate to linux server
1.1 cpanel > SSL / TLS >CERTIFICATES (CRT)
1.2. click CERTIFICATES (CRT) Generate, view, upload, or delete SSL certificates
1.3. Upload a New Certificate or just copy past here
1.4 previously downloaded certificate is here
1.5 upload certificate file or copy paste, just choose 1 method, they works the same
1.6 Now a new certificate save on server. next step, install it.
2. install new certificate on apache server
2.1 cpanel > SSL / TLS > INSTALL AND MANAGE SSL FOR YOUR SITE (HTTPS)
Manage SSL sites.
2.2 browse to the newly saved certificate
2.3
2.4 click "install" button
2.5 Now apache server have a new certificate installed
3. next step install certificate on 2 node.js apps. copy past private.key and public.certificat