Fix: Lambda backend instance unreachable after dstack server restart#2946
Merged
Bihan merged 1 commit intodstackai:masterfrom Aug 6, 2025
Conversation
jvstme
approved these changes
Aug 5, 2025
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
This PR fixes issue #2669, where the shim launched via SSH gets terminated when the dstack server restarts.
Issue Cause:
dstack's local daemon thread creates an SSH connection to the VM. The shim installation command runs on the VM via this SSH connection, unlike cloud-init setup.Even though the shim runs on the VM, it's still a child of the SSH session.When dstack server restarts → daemon thread dies → SSH connection closes.When SSH session closes, the remote shell session ends, and any processes started by that session (including the shim) get terminated.
Fix:
The shim launch_command is daemonized as daemonized_command = f"{launch_command.rstrip('&')} >/tmp/dstack-shim.log 2>&1 & disown"