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+++
title = "Debugging"
weight = 120
+++
To enable debug and system call logging, add the `runtimeArgs` below to your
[Docker](../docker/) configuration (`/etc/docker/daemon.json`):
```json
{
"runtimes": {
"runsc": {
"path": "/usr/local/bin/runsc",
"runtimeArgs": [
"--debug-log=/tmp/runsc/",
"--debug",
"--strace"
]
}
}
}
```
You may also want to pass `--log-packets` to troubleshoot network problems. Then
restart the Docker daemon:
```bash
sudo systemctl restart docker
```
Run your container again, and inspect the files under `/tmp/runsc`. The log file
with name `boot` will contain the strace logs from your application, which can
be useful for identifying missing or broken system calls in gVisor.
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