Enable gVisor syscall tracing and debug logging to diagnose a container's missing or broken syscalls
domain: gvisor.dev · 5 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
In /etc/docker/daemon.json add runtimeArgs to the runsc runtime: --debug --debug-log=/tmp/runsc/ --strace (add --log-packets for network problems)
Restart the Docker daemon: sudo systemctl restart docker
Run your failing container with --runtime=runsc and reproduce the problem
Read the .boot files in /tmp/runsc (strace of your application - identifies missing/broken syscalls) and the .create files (container startup failure reasons)
Use a per-sandbox log path to avoid clobbering concurrent logs: --debug-log=/tmp/runsc/log.%ID%.%COMMAND%.txt
Known gotchas
A trailing slash on --debug-log treats the path as a directory (one log file per command); without %ID%-style variables, concurrent sandboxes clobber the same file
Get stack traces from a running sandbox with: sudo runsc --root /var/run/docker/runtime-runsc/moby debug --stacks <container-id> (--root is provided by Docker)
SELinux must be disabled when running with debugging enabled
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