Finally secured this blog with free SSL certificate from Let’s Encrypt! First I had to upgrade my VPS to Ubuntu 16.04 from an unsupported version. Used this opportunity to switch this site back to Linode as they provide 1GB RAM for the 5$ instance(compared to 512MB on DigitalOcean).
The VPS is now located at Singapore which give around ~35ms latency compared to ~250ms latency when accessed from India. Linode doesn’t have data centers in India where the ping time would be ~10ms. DigitalOcean scores over this as they have data-center at Bangalore.
Coming back to enabling SSL, I just followed the simple guide: How to secure apache2 with Let’s Encrypt
The job was done in few minutes!