How I Restored My Website After a jsDelivr CDN Outage
The article recounts a real‑world CDN failure that broke the passjava.cn site, explains what a CDN is, and details step‑by‑step recovery actions—including downloading assets, using alternative storage, and refreshing a new CDN—to get the site back online.
I'm Wukong, and my site passjava.cn went down because the free CDN cdn.jsdelivr.net that hosted its static files became unavailable.
The CDN (Content Delivery Network) distributes site assets across global nodes to reduce latency and improve reliability, which is why many projects rely on it.
Following Murphy's Law, the outage caused a production‑grade T0 incident, with users unable to load the backend management system.
The error screenshot is shown (omitted here for brevity).
To handle the situation I followed a four‑step plan: calm the readers, explain the cause in understandable terms, propose a fix, and give an estimated resolution time.
The fix involved downloading every static file referenced from cdn.jsdelivr.net , storing them on my own server or another CDN, and updating the site links accordingly.
I offered two practical options: wait for the original CDN to recover and retry downloading, or use a GitHub repository ( https://github.com/Jackson0714/static-files ) that already contains the needed files for Docsify‑based sites.
Personally I used Qiniu Cloud's object storage and CDN service: I uploaded the files, obtained public CDN URLs, replaced the broken links, and refreshed the CDN cache to ensure the new assets are served.
After about two hours of urgent work—downloading files, fixing JavaScript references, uploading to Qiniu, and refreshing the CDN—the site was fully restored, though the incident affected my performance metrics.
Finally, I note that my server is low‑spec, so heavy load testing is discouraged, and I invite readers to visit the site at www.passjava.cn.
Wukong Talks Architecture
Explaining distributed systems and architecture through stories. Author of the "JVM Performance Tuning in Practice" column, open-source author of "Spring Cloud in Practice PassJava", and independently developed a PMP practice quiz mini-program.
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