Don’t be suprised when you see Ubuntu is complaining port 53 is not avaiable. Most people won’t encounter this issue unless you are doing things with DNS. In default, port 53 is reserved by systemd-resolved
Let Docker and UFW Firewall work together
If you see your Docker container ports got exposed and bypassed all UFW rules, that is normal because Docker will manipulate iptables when creating container. Docker in default will work with iptables nicely without user creating complicated iptables rules. If you don’t want Docker creating iptables rules or you are using UFW, you need to propertly configure them to make then work nicely together.
Install Isso server free with GCP
Isso is an open source comment system similar to Disqus and other paid comment systems, but without using heavy third party script that contain tracking and analystic functions. It use SQLite3 database to store comments since comments take very litttle space.
Connect to existing AWS AppSync API from a React Application
Have an existing API within AWS AppSync and need to connect it from a React web application? If you are not completely new to GraphQL you should know that the most popular GraphQL client is Apollo.
Build an extremely fast WordPress with GCP Part 2: Nginx
Apache or Nginx, what softwares should be used to for your server to achieve the maximum performance? If you have a small free server from GCP from part 1, and you want it to be able to handle average 1000 clients per second, Nginx is the best option. Apache use more server resources and must be configured properly to get the best performance. Nginx can handle very large amount of traffic even in a limited environment. We have done the loading test with the server from Google Cloud Platform from part 1 and the result was great without deep optimization. 1000 client/sec is not the maximum that this setup can get, it is the limit of the free test we could get. 
When we tried the same test using Apache, the test was aborted at the beginning because server crashed. That is why we will use Nginx. We are not the server expert, so we will not discuss how to optimize Apache to pass the same test. What we will need is NGINX + MySQL + PHP-FPM + Microcaching + WordPress.
Build an extremely fast WordPress with GCP Part 1: server
Can you get a super fast server free from Google? Yes, you can. Google Cloud Platform has free tier for US region server. If you are building a small WordPress website using light bandwidth, the free tier is more than sufficient. Free tier provide 720 hours of instance usage which will cover whole month of usage. The only downside is if your site use a lot of bandwidth you will be billed after 1GB of free egress bandwidth, but still cheap because 1 GB cost only $0.01 for US and 1 TB $0.12 - $0.23 depends on the regions. Most new sites use only small amount of bandwidth. Ingress is free if you wonder. As of today, the free tier offer: