# Service Logs

Service logs provide a complete record of each FindFace component activity. Consulting logs is one of the first things you should do to identify a cause for any system problem.

In this section:

## Configure Logging

The FindFace services log a large amount of data, which can eventually lead to disc overload. To prevent this from happening, we advise you to disable rsyslog due to its suboptimal log rotation scheme and use the appropriately configured systemd-journal service instead.

Do the following:

1. Check whether the /var/log/journal directory already exists. If not, create it by executing the following command:

sudo mkdir /var/log/journal
sudo chmod 2755 /var/log/journal

2. Open the /etc/systemd/journald.conf configuration file. Enable saving journald logs to your hard drive by uncommenting the Storage parameter and changing its value to persistent. Disable filtering in systemd-journal as well:

sudo vi /etc/systemd/journald.conf

[Journal]
...
Storage=persistent
...
RateLimitInterval=0
RateLimitBurst=0
...


If necessary, uncomment and edit the SystemMaxUse parameter. This parameter determines the maximum volume of log files on your hard drive. Specify its value in bytes or use K, M, G, T, P, E as units for the specified size (equal to $$1024$$, $$1024^2$$, … bytes).

...
SystemMaxUse=3G

3. Restart the journald service.

sudo systemctl restart systemd-journald.service

4. Stop and disable the syslog service.

sudo systemctl stop syslog.socket rsyslog.service
sudo systemctl disable syslog.socket rsyslog.service

5. If necessary, delete the existing log files created through syslog, and the kernel logs.

sudo rm /var/log/syslog*
sudo rm /var/log/kern.log*


## Consult Service Logs

Use the journalctl -u <component> command to consult a component log, for example as follows:

journalctl -u findface-extraction-api