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14 Common Errors When Deploying Rails 8 with Kamal on Hetzner Behind Cloudflare

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A developer has documented 14 recurring errors encountered when deploying Ruby on Rails 8 applications using Kamal 2 on Hetzner servers with Cloudflare, along with a fix for each. Issues range from missing CLI tools and SSH key mismatches to Docker permission errors and misconfigured GitHub registry tokens. Several errors stem from architecture mismatches, such as building arm64 images on Apple Silicon Macs for amd64 servers, or from incorrect environment variable and database configuration. Cloudflare-specific problems include redirect loops caused by Flexible SSL mode and certificate issuance failures when the orange-cloud proxy is active too early. Additional pitfalls cover asset serving during container swaps, Active Storage volume configuration, and memory shortages on small servers during asset precompilation.

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14 Common Errors When Deploying Rails 8 with Kamal on Hetzner Behind Cloudflare · ShortSingh