@roboticpuppies

[EN] Set Up Amazon ECR Pull-Through Cache for Docker Hub

Apr 22 · 4 min read · The Problem The developers are actively build and test their projects. There are dozens of projects that can be built in a day. This sometimes causes the disk of the CI/CD system (e.g., Jenkins, self-

[EN] Track progress of MySQL Import/Export process using PV

Nov 21, 2025 · 2 min read · The problem Today, I need to export a MySQL database and then import it to a new server. The database is not too big, just a few GBs. But it was taking so long, and I wonder when this will be finished? By default, when you run mysqldump command to ex...

[EN] Lesson learned from using the wrong AWS ElastiCache Redis endpoint

Aug 13, 2025 · 3 min read · A couple of days ago, I learned the hard way that using the wrong endpoint in AWS ElastiCache for Redis can take your app down. I didn’t pay enough attention to the Primary Endpoint, Reader Endpoint, and the Node’s Endpoint. Here’s what happened. Cur...

[EN] My experience taking the KCNA certification

Aug 7, 2025 · 6 min read · Last year, I bought a KCNA + CKA certification voucher while there was a Black Friday event. But I only dared to take the KCNA exam in the middle of this year. I'm the type of person who is well-prepared and wants to understand things thoroughly from...

[EN] How I Stopped Copy-Pasting AWS EC2 IPs and Started SSHing Smarter

May 21, 2025 · 2 min read · Remembering IP in a massive, dynamic environment is not easy. You may have an instance with IP 10.0.0.1 today, but there is no guarantee that the same server will be there tomorrow. If you are still SSH-ing to your server using a traditional method l...