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I have three servers:

  1. Web-Server
  2. Database Server
  3. Database Replication Server

In the upcoming days, I am going to order a SSL certificate for the Web-Server to deliver the data encrypted to the client. This SSL certificate should be enough to also transport the data encrypted to the Database Server.

However, I am also in need of an encrypted connection in regards to the Database Replication Server.

Is it possible to set up the exact same SSL certificate on the Database Server/Database Replication Server? Or will I have to order an extra SSL certificate?


OS: Ubuntu Linux

DBMS: postgreSQL

Reason for encrypting data: Securing data, avoiding MITM attacks, ... (propably every reason for SSL encryption).

WAN: I have three independent vServers. I might move the DB-Servers into a VLAN (intranet) later on but at the moment all servers are running independently at one hoster's network.

  • More detail needed - why are you encrypting the database connection? What database engine are you using? What OS? Is your database connection across a WAN? – Craig Watson Jun 10 '15 at 16:11
  • Why would these matter? He needs them encrypted, and wants to know how many certs he will need – ztk Jun 10 '15 at 16:12
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    How do you know? The OP hasn't given any details. – Craig Watson Jun 10 '15 at 16:15
  • I know he needs them encrypted because he says so in his question. (The sentence beginning "However") – ztk Jun 10 '15 at 16:22
  • Updated the question. Why do OS and DBMS matter? – chrisp Jun 10 '15 at 16:26
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Yes, You can use SSL certificate for any of your server whether it is Web-Server, Database Server or Database Replication Server.

If you buy a Comodo SSL certificate then you will be allows to install SSL on any number of server.

For Symantec & Thawte SSL certificate, you need to purchase license for each single server.

  • On your listed website "cheapsslsecurity.com", the GeoTrust products are also listed as having "unlimited server licenses" – Mathias R. Jessen Jun 11 '15 at 11:16
  • Why would that matter? The SSL certificate is still bound to one domain and that domain points to one server only. – chrisp Jun 12 '15 at 7:02

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