How do I get SSL for multiple subdomains?
Run sudo certbot --nginx -d yourdomain.com -d api.yourdomain.com -d admin.yourdomain.com to get one certificate for all domains (SAN certificate). Or run certbot separately for each domain to get individual certificates.
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More FAQs in Nginx Server Blocks and Virtual Hosts Hosting Multiple Apps on One Server
Create a server block for each domain or subdomain. Each server block has a different server_name and proxy_pass or root. Enable all with symlinks to sites-enabled, test with nginx -t, and restart. Use certbot to get SSL for all domains.
A server block (also called virtual host) is a configuration section that defines how Nginx handles requests for a specific domain. It includes listen port, server_name, and location blocks for routing. Multiple server blocks allow hosting multiple sites on one server.
Use the upstream directive to define a pool of backend servers (e.g., upstream mybackend { server 127.0.0.1:3000; server 127.0.0.1:3001; }). Then use proxy_pass http://mybackend in the location block. Nginx distributes requests using round-robin by default.
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