zdienos/gist:6d02d2d535e93249f1a9e10ce690ddc2

## gistfile1.md

      
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    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

To avoid the error peer certificate cannot be authenticated with given ca certificates, remove the externalCA:
cat dotmarks_net.crt COMODORSADomainValidationSecureServerCA.crt COMODORSAAddTrustCA.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