Docker daemon log location
The Docker daemon provides essential information about the general state of your microservices architecture. Unfortunately, container-centric logging techniques allow you to collect relevant data from your services but provide little information about the state of your Docker services.
This article will discuss daemon events and where we can typically find the daemon logs for each operating system (OS).
What are daemon events?
Daemon events are notifications about how the Docker service is currently running. Each event shows:
- Current timestamp
- Log Level
- Event Details
The daemon's event log includes detailed information about:
- Operations performed during initialization
- Functions provided by the host kernel
- Status of commands sent to the container
- The overall status of the Docker service
- The state of the active container
Daemon events often provide detailed information about the state of the container. For example, a daemon log might look like this:
time="2022-09-18T11:28:40.726969388-05:00" level=info msg="POST /v1.3/container/sample/stop?t=10"
The following sections discuss finding the daemon logs in each operating system.
Docker daemon log location
We may be able to use the daemon logs to identify the problem. Depending on the operating system settings and the logging subsystem used, Docker can save logs in one of several locations:
| operating system | Location |
|---|---|
| Linux | Use the command journalctl -xu docker.service (or read /var/log/messages or /var/log/syslog, depending on your Linux distribution) |
| macOS daemon dockerd logs | ~/Library/Containers/com.docker.docker/Data/log/vm/dockerd.log |
| macOS daemon containerd log) | ~/Library/Containers/com.docker.docker/Data/log/vm/containerd.log |
| Windows WSL2 daemon dockerd log | %APPDATA%\Docker\log\vm\dockerd.log |
| Windows WSL2 daemon containerd log | %APPDATA%\Docker\log\vm\containerd.log |
| Universal Windows Containers | Windows Event Log (via Event Viewer) |
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