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