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My container cannot connect to Private Network resources at startup

Problem

When my Serverless Container instance starts, I get errors such as:

  • "No route to host" error message
  • "Connection timeout" error message
  • Other connection failures when trying to reach resources in the same Private Network (PN) (such as databases, Instances, etc.)
Note

This known issue is limited to the fr-par region and to containers attached to a PN.

Cause

The Serverless Container instance starts on a node where the PN is not yet fully available.

Solutions

Since a September 2026 update, the container instance waits for the PN router (169.254.169.254) to be reachable before starting. This update greatly reduces connection issues, but does not guarantee that all resources in the PN are reachable.

You can follow these solutions to ensure reliable connectivity at startup.

  1. Configure connection retries: If your container tries to connect to a resource in the PN at startup, implement retry logic with configurable timeouts.

  2. Configure startup probes: Set up the container startup probe to return a 200 status code only when all required PN resources are reachable. This prevents traffic from being routed to a container instance before it is fully ready.

  3. Set appropriate timeouts: Configure connection timeouts to allow sufficient time for the network to become available (up to 3 minutes).

Solution 2: Use dedicated Private Networks

The issue rarely occurs when both the container and the resource it needs to reach are in different PNs (but within the same VPC).

  1. In a VPC, create a PN dedicated to your containers.
  2. Place your containers in this dedicated PN.
  3. In the same VPC, create another PN for the resources your containers need to reach (databases, Instances, etc.).
  4. Place the resources in this separate PN.

Solution 3: Use a different region

If you can, deploy your containers in a different region to avoid this issue.

Going further

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