UniFi - How to View Log Files


Overview


This article will show users where to find their log files and how to view them for the different UniFi elements: Access Points, Switches, Security Gateways and Controller. Log files are essential to any support or troubleshooting needed, so it is important to know how to find them for all devices.


Table of Contents


  1. Log File Location
  2. How to View Log Files: UniFi APs and Switches
  3. How to View Log Files: UniFi Security Gateways
  4. How to View Log Files: UniFi Controller
  5. How to Download Encrypted Log Files from UI
  6. Related Articles

Log File Location


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NOTE: The symlink directory for Linux is mentioned below as it is the consistent folder location on the officially supported distros. It is the same whether you install the controller on your own installation of Debian or Ubuntu, or if it's on the UniFi Video NVR appliance or UniFi Cloud Key. Depending on the platform being used, and how it is configured, there will be other locations, but no matter what, on the supported distros, /usr/lib/unifi/logs will always contain the files.

There are three locations where you can view log files related to UniFi devices and the Controller: /var/log/messages, server.log, and mongod.log. See below what you will find in each.

1. UniFi AP: contains info local to UniFi Access Points, like 802.11 info

/var/log/messages

2. UniFi Switch: contains info local to the switch, like port link state changes, spanning tree events, etc.

/var/log/messages

3. UniFi Security Gateway: contains USG’s general logging.

/var/log/messages

4. UniFi Controller:

  • Contains information about controller software, communication with UAPs, etc:
server.log
  • Contains information about UniFi software local to PC controller.
mongod.log

How to View Log Files: UniFi APs and Switches


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To view log files under UAP and USW:

1. Connect to UAP or USW via SSH
2. Type

cat /var/log/messages

3. View output 

To view the live logs, with output updating in your SSH session as new logs are appended, run the following instead of the above cat command.

tail -f /var/log/messages

How to View Log Files: UniFi Security Gateways


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To view log files under a USG:

1. Connect to the USG via SSH
2. In the EdgeOS CLI, the log can be viewed by running:

General Logging

show log

IPsec VPN Logging

show vpn log 

FreeRADIUS Logging 

sudo cat /var/log/freeradius/radius.log

DNSmasq Logging

sudo cat /var/log/dnsmasq.log

IPS/IDS Engine Logging

sudo cat /var/log/suricata/suricata.log

3. View live logging

To view the live logs, with output updating in your SSH session as new logs are appended, run the following instead of the cat command above.

tail -f /var/log/messages
User Tip: If a user would like to only get the last number of lines the tail utility can be used. The command below will output the last 10 lines of the radius.log file. 
sudo tail -n 10 /var/log/freeradius/radius.log
NOTE: Firewall logs aren't in the UI yet. Please see this Community post for more details.  

How to View Log Files: UniFi Controller


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Logs can be viewed under the Insights section within the Controller. Click the drop-down in the top left and select "Controller Logs." Once the logs start populating there are options to fetch more logs or download the log file. 

The path to view logs on UniFi Controller is dependent on the controller host:

  • Windows: C:\Users\<username>\Ubiquiti UniFi\logs\
  • Mac OS X: /Users/<username>/Library/Application\ Support/UniFi/logs/
  • UniFi Cloud Key and Debian/Ubuntu Linux*: /usr/lib/unifi/logs/ 

How to Download Encrypted Log Files from UI


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The UniFi Controller also allows users to download log files to share with Ubiquiti support, but these logs are encrypted (for security reason), so as the user, you wouldn't be able to view the logs. For viewing, we continue to suggest all the options described above. It is important to note that this support file does not include device logs.

In the UniFi Controller go to Settings > Maintenance and under the Support Info section, you can click the Download Support Info button.


Related Articles


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Intro to Networking - How to Establish a Connection Using SSH


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