Hey👋 I’m Oscar from 🗺️New Zealand

1. Introduction No matter if you are a software developer, a quality assurance engineer, or a DevOps engineer, you may need to generate a self-signed mutual TLS(mTLS) or TLS certificates and keys for testing purposes. As the title shows, this post is not a click bait. I will show you how to generate a self-signed TLS certificate and key in 10s for both server and client. Of course, if you have mTLS certificate and key files, you can also use part of them as self-signed TLS certificate and key....

Problem If you use ent with sqlite3 driver in your Golang project, you may encounter the following error when you try to insert a new record to the table. insert nodes to table "users": near "RETURNING": syntax error Analysis The error message indicates that the sqlite3 driver does not support the RETURNING clause. If you are using Golang sqlite3 package github.com/mattn/go-sqlite3 in your project. The issue may be caused by the version of the package....

Traefik is a popular reverse proxy that can be used to expose internal containerized services to the public in a simple and intuitive way. However, if you want to expose internal services that are installed and configured directly on the host system instead of containerized, you may encounter some difficulties, particularly when using Oracle Cloud Infrastructure (OCI). This technical post will provide a step-by-step guide on how to expose internal non-containerized services to the public using Traefik on OCI....

Gitea has recently released version 1.20.0, and I endeavored to upgrade my locally-hosted instance from version 1.17.0 to 1.20.0. During this process, I encountered the following error when attempting to execute the docker-compose file: routers/init.go:60:mustInit() [F] code.gitea.io/gitea/models/asymkey.RewriteAllPublicKeys failed: open /data/git/.ssh/authorized_keys.tmp: permission denied Received signal 15; terminating. This issue is not exclusive to the new version, as some users have reported similar problems when upgrading from older versions, such as 1.17.3 to 1....

Hey there, if you’re getting a super frustrating error when trying to join a Docker Swarm in Oracle Cloud Infrastructure (OCI) VM, then you’ve come to the right place! Here’s the error message you might see: Error response from daemon: rpc error: code = Unavailable desc = connection error: desc = "transport: Error while dialing dial tcp 132.12.23.123:2377: connect: no route to host" Yikes! But don’t worry, we’ve got some easy steps you can follow to fix it and get back to your Docker swarming in no time....

If you have ever wonder that how the SFTP(Secure File Transfer Protocol) SaaS(Software as a Service) product architecture looks like, this post will give you a brief introduction. Designing the architecture for an SFTP SaaS product involves considering various components and their interactions. Here’s a high-level architecture for an SFTP SaaS product: 1. High-level Architecture 1.1 User Interface (UI) Develop a user-friendly web-based interface that allows users to manage their SFTP accounts, access files, and perform file operations....

Introduction In the realm of modern software development, the use of containerization has revolutionized the way applications are developed, tested, and deployed. Docker, a popular containerization platform, allows developers to create lightweight and isolated environments known as containers. However, when dealing with scenarios involving multiple containers that require isolated environments, testing and debugging can become quite a challenge. Enter Docker-in-Docker (DinD), a powerful tool that alleviates these pains and streamlines the development process....

Introduction If you are rocking VSCode as your IDE for Golang development and haven’t installed the debugger, I would recommend you to do it now. And Don’t worry, I’ve got your back. In this friendly guide, I’m going to walk you through the process of setting up and configuring the Golang debugger in VSCode. Step by step guide 1. Install the Debugger for Golang Delve, a fantastic open-source project, is your go-to debugging companion for Golang in VSCode....

Let’s say you have multiple Drone CI runners. By some reasons, you want to route pipelines to a particular Drone CI runner. How do you do that? The answer is to use the DRONE_RUNNER_LABELS environment variable to label your Dronce CI runner and in the Drone CI pipeline, specify the the label value under the node section. Scenario Without examples, it’s hard to understand. So let’s go through an example....

While SSH is a valuable tool for debugging and testing Docker containers, enabling it in production environments is not recommended due to security concerns. To disable SSH in a Docker container, it’s advisable to remove the SSH server during the image building process. One way to accomplish this is to remove the SSH server during the Docker image building process. For example, if you’re using the alpine base image, you can use the following Dockerfile:...