# Enable Debug Logging for Docker Daemon

## Problem

There is a need to enable or disable debug logging for the Docker daemon.

## Environment

* Platform9 Managed Kubernetes - All Versions
* Docker

## Answer

1. Edit the */etc/docker/daemon.json* file and set the ***"debug": true*** flag. The file should look as shown below when edited.

{% tabs %}
{% tab title="None" %}

```none
{
"bridge": "none",
"graph": "/var/lib/docker",
"group": "pf9group",
"log-driver": "json-file",
"log-opts": {
"max-size": "10m",
"max-file": "10"
},
"storage-driver": "",
"storage-opts": [ ],
"debug": true
}
```

{% endtab %}
{% endtabs %}

2. Send a SIGHUP signal to the Docker daemon, triggering it to reload its configuration without restarting the process.

{% tabs %}
{% tab title="None" %}

```none
# ps -ef | grep docker
root 17910 1 1 XX:XX ? XX:XX:XX /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
```

{% endtab %}
{% endtabs %}

{% tabs %}
{% tab title="None" %}

```none
# kill -SIGHUP 17910
```

{% endtab %}
{% endtabs %}

3. To check whether the configuration has been applied, use the below command.

{% tabs %}
{% tab title="None" %}

```none
# docker info

Server:
Debug Mode: true
```

{% endtab %}
{% endtabs %}

Also, if the debug parameter is enabled, the output logs will be shown as follows.

{% tabs %}
{% tab title="None" %}

```none
# journalctl -u docker
master2 dockerd[17910]: time="XXXX-XX-XXTXX:XX:XX7819166Z" level=debug msg="Calling GET /v1.38/containers/json?filters=%7B%22label%22%3A%7B%22io.kubernetes.docker.type%3Dpodsandbox%22%3Atrue%7D%7D&limit=0"

master2 dockerd[17910]: time="XXXX-XX-XXTXX:XX:XX7819166Z" level=debug msg="Calling GET /v1.38/containers/json?all=1&filters=%7B%22label%22%3A%7B%22io.kubernetes.docker.type%3Dcontainer%22%3Atrue%7D%2C%22status%22%3A%7B%22running%22%3Atrue%7D%7D&limit=0"
```

{% endtab %}
{% endtabs %}

**Note:** To disable debug logging, perform both the steps again, setting ***"debug": false***.

## Additional Information

[Debug Logging for Docker](https://docs.docker.com/config/daemon/#enable-debugging)


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