547 posts
Today I got GitHub's email, 'GitHub Copilot: What's in your free plan 🤖'. Copilot now has a free tier open to everyone, including two large models: OpenAI GPT-4o and Anthropic.
On December 3, 2024, Cloudflare updated its 'Cloudflare Self-Serve Subscription Agreement', explicitly banning IP cherry-picking (deliberately selecting specific Cloudflare edge IPs) and building proxies (circumvention tunnels) on its platform.
Sometimes you can't install MariaDB with apt/yum, or you want every node in a database cluster running exactly the same MariaDB version. My motivation this time was building a MariaDB cluster with identical versions across nodes for easier management.
If you use the Flowable/Activiti process engine and the application hangs on startup with the error 'liquibase - Waiting for changelog lock....', it means a database table's lock was never released. This isn't a database-level table lock, so you won't find any locked table by querying — it's a logical lock.
In Spring Boot we commonly use @RestControllerAdvice and @ControllerAdvice to catch exceptions globally and handle them gracefully — but it can't really catch everything. A case I ran into: a custom filter extending OncePerRequestFilter validates the token, and when the token expires it throws an ExpiredJwtException that never gets caught.
In early February 2024, Freenom reclaimed every free domain — yes, all of them. Log into Freenom and check your domain status: everything shows PENDING.
A colleague on site reported that my application would periodically freeze with no response and no error logs — API requests just hung waiting. After they sent me a thread dump, I saw most threads in WAITING, stuck in com.alibaba.druid.pool.DruidDataSource.takeLast(). Solution first, root cause after.
Now that Google Chrome has been pushing HTTPS hard, almost every website is served over HTTPS. Have you heard of HSTS (HTTP Strict Transport Security)? It makes your website more secure and faster to load.
The other day someone asked me how I integrate Cloudflare and why it's relatively fast — and why the resolved IPs are still three A records? Let me share my site's architecture and how I use Cloudflare.
This post shares my personal high-concurrency Nginx configuration on a 2-core 2 GB Ubuntu box. Other Linux systems may differ — take it as reference only.
