Hi @alberaj! I'm Dosu and I’m helping the Stirling-PDF team.

This is a common issue with Docker containers when the network inside the container behaves differently from the host, even if curl works on the host. The hang at fetching APKINDEX.tar.gz almost always points to a DNS, proxy, or firewall issue affecting the container’s network stack, or sometimes to Alpine mirror problems.

A few things to try:

• Use the docker-fat image variant (stirlingtools/stirling-pdf:docker-fat), which doesn’t require downloads during startup and avoids this problem entirely (see maintainer advice).
• Make sure you’re using the latest image. Your logs show Alpine v3.21, but the current Dockerfile uses v3.22.0. Try pulling the latest image and clearing your Docker cache if needed (recent Dockerfile update).
• Check Docker’s DNS settings (in /etc/docker/daemon.json) and try setting a public DNS like 8.8.8.8 for containers.
• Temporarily disable any local DNS filtering, firewall, or ad-blocking software (like Pi-hole or AdGuard) that could interfere with container network requests (see similar networking issues).
• You can also run the container interactively (docker run -it --entrypoint sh ...) and try apk update inside to see if you get more detailed errors.

Let me know if any of these steps help or if you see any new errors!

To reply, just mention @dosu.

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