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Update Docker Desktop log paths from dockerd.log to init.log #24929

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Update Docker Desktop log paths from dockerd.log to init.log #24929

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40 changes: 21 additions & 19 deletions content/manuals/engine/daemon/logs.md
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Expand Up @@ -10,31 +10,33 @@ The daemon logs may help you diagnose problems. The logs may be saved in one of
a few locations, depending on the operating system configuration and the logging
subsystem used:

| Operating system | Location |
| :--------------------------------- | :--------------------------------------------------------------------------------------------------------------------------------------- |
| Linux | Use the command `journalctl -xu docker.service` (or read `/var/log/syslog` or `/var/log/messages`, depending on your Linux Distribution) |
| macOS (`dockerd` logs) | `~/Library/Containers/com.docker.docker/Data/log/vm/dockerd.log` |
| macOS (`containerd` logs) | `~/Library/Containers/com.docker.docker/Data/log/vm/containerd.log` |
| Windows (WSL2) (`dockerd` logs) | `%LOCALAPPDATA%\Docker\log\vm\dockerd.log` |
| Windows (WSL2) (`containerd` logs) | `%LOCALAPPDATA%\Docker\log\vm\containerd.log` |
| Windows (Windows containers) | Logs are in the Windows Event Log |

To view the `dockerd` logs on macOS, open a terminal Window, and use the `tail`
command with the `-f` flag to "follow" the logs. Logs will be printed until you
terminate the command using `CTRL+c`:
| Operating system | Location |
| :--------------------------- | :--------------------------------------------------------------------------------------------------------------------------------------- |
| Linux | Use the command `journalctl -xu docker.service` (or read `/var/log/syslog` or `/var/log/messages`, depending on your Linux Distribution) |
| macOS (Docker Desktop) | `~/Library/Containers/com.docker.docker/Data/log/vm/init.log` |
| Windows (WSL2) | `%LOCALAPPDATA%\Docker\log\vm\init.log` |
| Windows (Windows containers) | Logs are in the Windows Event Log |

On macOS and Windows (WSL2), Docker Desktop writes daemon logs (`dockerd`,
`containerd`, and other VM services) to a single multiplexed `init.log` file
in JSON format. Each line contains a `"component"` field identifying the
service. To follow the logs, open a terminal and use the `tail` command with
the `-f` flag. Logs print until you terminate the command using `CTRL+c`:

```console
$ tail -f ~/Library/Containers/com.docker.docker/Data/log/vm/dockerd.log
2021-07-28T10:21:21Z dockerd time="2021-07-28T10:21:21.497642089Z" level=debug msg="attach: stdout: begin"
2021-07-28T10:21:21Z dockerd time="2021-07-28T10:21:21.497714291Z" level=debug msg="attach: stderr: begin"
2021-07-28T10:21:21Z dockerd time="2021-07-28T10:21:21.499798390Z" level=debug msg="Calling POST /v1.41/containers/35fc5ec0ffe1ad492d0a4fbf51fd6286a087b89d4dd66367fa3b7aec70b46a40/wait?condition=removed"
2021-07-28T10:21:21Z dockerd time="2021-07-28T10:21:21.518403686Z" level=debug msg="Calling GET /v1.41/containers/35fc5ec0ffe1ad492d0a4fbf51fd6286a087b89d4dd66367fa3b7aec70b46a40/json"
2021-07-28T10:21:21Z dockerd time="2021-07-28T10:21:21.527074928Z" level=debug msg="Calling POST /v1.41/containers/35fc5ec0ffe1ad492d0a4fbf51fd6286a087b89d4dd66367fa3b7aec70b46a40/start"
2021-07-28T10:21:21Z dockerd time="2021-07-28T10:21:21.528203579Z" level=debug msg="container mounted via layerStore: &{/var/lib/docker/overlay2/6e76ffecede030507fcaa576404e141e5f87fc4d7e1760e9ce5b52acb24
$ tail -f ~/Library/Containers/com.docker.docker/Data/log/vm/init.log
{"component":"dockerd","level":"debug","msg":"attach: stdout: begin","time":"2021-07-28T10:21:21.497642089Z"}
{"component":"dockerd","level":"debug","msg":"attach: stderr: begin","time":"2021-07-28T10:21:21.497714291Z"}
...
^C
```

To filter for `dockerd` output only:

```console
$ grep '"component":"dockerd"' ~/Library/Containers/com.docker.docker/Data/log/vm/init.log
```

## Enable debugging

There are two ways to enable debugging. The recommended approach is to set the
Expand Down