Blog
Technical articles, deep dives, and announcements from the Upsun team and community.
Recent
How It WorksAug 25, 2026
Why Let’s Encrypt certificate renewals fail
Certificate renewals fail for a handful of recurring reasons. Here’s how the HTTP-01 challenge works and what breaks it, from IPv6 records to CDN rules.
TutorialsAug 20, 2026
Offload Heavy Jobs to Upsun Task Containers, Triggered by Cron
Move long, resource-hungry jobs out of your crons and into on-demand Upsun task containers. Learn how to define a task, authorize your app to trigger it, and fire it from a lightweight cron for database imports or search reindexing.
How It WorksAug 18, 2026
How SSH authentication works on Upsun
Decode the SSH certificate the Upsun CLI provisions for you, then follow it through the SSH proxy: CA trust, revocation, access documents, and MFA.