How to secure Plesk and mail server with Let's Encrypt certificate via CLI?

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Question

How to secure Plesk and mail server with Let's Encrypt certificate using command line?

Answer

By default, new Plesk installations come with pre-installed Let's Encrypt extension and if the server's hostname is correct, Plesk secures itself automatically.

Note: To issue a certificate, correct hostname should be used in OS, and it should resolve to the server's IP address.
Here and forth example.com will be used as the server's hostname and 203.0.113.2 will be used as the server's public IP.

Check if server's hostname resolves properly

On Windows
1. Connect to the server via RDP
2. Find out server's hostname:
  
  C:\> plesk bin server_pref --get-hostname
  example.com
3. Make sure that the hostname points to the server's IP:
  
  C:\> nslookup example.com 8.8.8.8
  Server: google-public-dns-a.google.com
  Address: 8.8.8.8
  
  Non-authoritative answer:
  Name: example.com
  Addresses: 203.0.113.2
On Linux
1. Connect to the server via SSH
2. Find out server's hostname:
  
  # plesk bin server_pref --get-hostname
  example.com
3. Make sure that the hostname points to the server's IP:
  
  # host example.com 8.8.8.8
  Using domain server:
  Name: 8.8.8.8
  Address: 8.8.8.8#53
  Aliases:
  
  example.com has address 203.0.113.2

Issue and apply the certificate to the server with CLI utility

Connect to the server via SSH or RDP
Make sure that the latest Let's Encrypt extension is installed on the server:

# plesk bin extension -i letsencrypt

C:\> plesk bin extension -i letsencrypt
Issue and secure Plesk with a certificate:
- On Linux:
  
  # plesk bin extension --exec letsencrypt cli.php --secure-plesk -m john.doe@example.com -w /var/www/vhosts/default/htdocs -d example.com
- On Windows:
  
  C:\> plesk bin extension --exec letsencrypt cli.php --secure-plesk -m john.doe@example.com -w "%plesk_dir%\default\htdocs" -d example.com
Secure additional services:
- Set the certificate as default for an IP address:
  
  # plesk bin certificate --assign-cert "Lets Encrypt certificate" -ip 203.0.113.2
- Set the certificate for the mail server:
  
  # plesk bin mailserver --set-certificate "Lets Encrypt certificate"
- Set the certificate for Plesk Control panel:
  
  # plesk bin server_pref --update -panel-certificate "Lets Encrypt certificate"

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