How to renew the SSL certificates for dovecot and postfix

Published: April 10, 2020 / Updated: April 10, 2020 Akhil Jalagam Beginners, DevOps, Howto, Linux, Security

Make a backup of the existing SSL key and certificate file

cd /etc/pki/dovecot
cp -a certs/dovecot.pem certs/dovecot.pem.old
cp -a private/dovecot.pem private/dovecot.pem.old

Create the new SSL certificate for two years:

openssl genrsa -out private/dovecot.pem 1024
openssl req -new -x509 -key private/dovecot.pem -out certs/dovecot.pem -days 730

Restart Dovecot and Postfix

sudo systemctl
… Read more

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How to Redirect HTTP to HTTPS in Nginx

Published: October 12, 2019 / Updated: April 23, 2020 Akhil Jalagam Beginners, DevOps, Howto, Linux, Web Server

All login credentials transferred over plain HTTP can easily be sniffed by a MITM attacker, but it is not enough to encrypt the login forms. If you are visiting plain HTTP pages while logged in, your session can be hijacked, and not even two-factor authentication will protect you. To protect … Read more

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