How to chain PositiveSSL Certificates with Nginx

gistfile1.md

The process starts by creating the CSR and the private key:

openssl req -nodes -newkey rsa:2048 -nodes -keyout dotmarks.net.key -out dotmarks.net.csr -subj "/C=GB/ST=London/L=London/O=dotmarks/OU=IT/CN=dotmarks.net"

Generates

• dotmarks.net.key
• dotmarks.net.csr

After validation, you will get a zip file with 4 files:

• AddTrustExternalCARoot.crt
• COMODORSAAddTrustCA.crt
• COMODORSADomainValidationSecureServerCA.crt
• dotmarks_net.crt

We have to create a certificate with all the intermediate certs.

# order is important!
cat dotmarks_net.crt COMODORSADomainValidationSecureServerCA.crt COMODORSAAddTrustCA.crt AddTrustExternalCARoot.crt > dotmarks.pem

Once we have this pem file, we can configure nginx:

ssl    on; 
ssl_certificate         /etc/nginx/ssl/dotmarks.net/dotmarks.pem;
ssl_certificate_key     /etc/nginx/ssl/dotmarks.net/dotmarks.net.key;

Then you just have to restart nginx:

sudo service nginx reload sudo service nginx restart