How to retrieve logs with the log plugin

You can now access any type of logs directly from your Cumulocity UI, using the c8y_log_plugin daemon. To get started install the c8y_log_plugin via the debian package.

If you have not installed via the debian package, make sure you have the following:

  • run sudo c8y_log_plugin --init
  • a c8y-log-plugin.service file in /lib/systemd/system/c8y-log-plugin.service
  • a c8y_log_plugin binary in /usr/bin/c8y_log_plugin
  • check if /etc/tedge/c8y/c8y-log-plugin.toml was created

After the device is connected to Cumulocity, this plugin needs to be started and enabled as follows:

sudo systemctl start c8y-log-plugin
sudo systemctl enable c8y-log-plugin

If you go to Cumulocity, you should see that you are able to see the logs tab and you can request "software-management" logs. However, you are not limited to only thin-edge logs. To add a new log type, you need to edit the c8y-log-plugin.toml in /etc/tedge/c8y/c8y-log-plugin.toml

sudo nano /etc/tedge/c8y/c8y-log-plugin.toml

In this toml file you specify the log type and log path of the logs wished to be retrieved from Cumulocity UI. For example, if you wish to request thin-edge software logs and mosquitto logs an example toml file would be:

files = [
  { type = "software-management", path = "/var/log/tedge/agent/software-*" },
  { type = "mosquitto", path = "/var/log/mosquitto/mosquitto.log" }

Note that path need not be a complete path. It can be a full path to a log file or a glob pattern. For example the "software-management" type is a glob pattern that groups any file inside "/var/log/tedge/agent/" that starts with "software-".

The type key in the toml is the name of the log with you will see in the Cumulocity UI:

Log request dropdown