Step — 1: Pull Image

Step — 2: Create Container

Parameter Description

--name postgres define container name as postgres

-e POSTGRES_PASSWORD define default password for user postgres

-p 5432:5432 map container port 5432 with local port 5432

-d run container in detach mode

Step — 3: Connect it

host: localhost

port: 5432

username: postgres

password: <password from step 2>

Connect to PostgreSQL container with your favorite Database client like PgAdmin, DBeaver

Make sure that you have Spring Boot DevTools dependency on your pom.xml

Step 1 — Enable “Build project automatically”

Open Settings > Build, Execution, Deployment > Compiler

Step 2 — Open Registry

Press Ctrl + Shift+ A, then search for Registry then press Enter

There are so many Docker images for Kafka and ZooKeeper.

One of the most popular Docker Image is Bitnami/kafka

From an official document, just few steps to do it.

Basically we need to create Docker Network to be a bridged between ZooKeeper and Kafka Docker Containers.

Step 1 — Create…

MapStruct is a one of most powerful library to mapping in Java

Let’s say we have Customer.java and CustomerDTO.java

Customer.java

CustomerDTO.java

Let’s say we need to keep simple Audit data like:

  • create date
  • update date
  • create by
  • update by

Spring Boot is already provided this solution for us.

Step 0 — Make sure you have JPA in your pom.xml

Step 1 — Create Auditor.java

It’s easy to use UUID String as Primary Key when you are using PostgreSQL database.

To archive this, just configure your Entity to use UUID2 generator.

Done!

Configure Spring Boot App to work with PostgreSQL is easy.

Step 0 — Make sure you have JPA in your pom.xml

Step 1 — Add PostgreSQL into your pom.xml

Step 2 — Configure your application.yaml

That’s it! Easy?

What’s PodPreset

To enable PodPreset in Microk8s

Step 1 — Edit kube-apiserver

Step 2 — Add PodPreset and settings.k8s.io/v1alpha1=true

Step 3 — Restart Kubernetes API Server

Testing

You should get something like this

What’s next?

Learn how to create simple PodPreset and inject to your pod

1. Add HTTP & Header Configuration to nginx.conf

2. Restart Nginx

Reference: https://nginx.org/en/docs/http/websocket.html

I have a CentOS server which running Angular Web App on port 4200, and I want to access this web app with http://MY_SERVER . What should I do?

1. Install Nginx

2. Start Nginx

3. Enable Nginx

4. Add HTTP/HTTPS Firewall

5. Test Nginx

Open URL http://MY_SERVER, and I should see Nginx Welcome Page .

6. Add Proxy Pass to nginx.conf

7. Restart Nginx

8. Test Proxy

Open URL http://MY_SERVER , and I should see my Angular Web App

Natthapon Pinyo

Java Team Leader at Aware Group

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