sudo ./validate.php
fatal: No names found, cannot describe anything.
====================================
Component | Version
--------- | -------
LibreNMS  |
DB Schema | 215
PHP       | 5.5.9-1ubuntu4.22
MySQL     | 5.5.58-0ubuntu0.14.04.1
RRDTool   | 1.4.7
SNMP      | NET-SNMP 5.7.2
====================================

[OK]    Database connection successful
[OK]    Database schema correct
[WARN]  PHP version 5.6.4 will be the minimum supported version on January 10, 2018.  We recommend you update to PHP a supported version of PHP (7.1 suggested) to continue to receive updates.  If you do not update PHP, LibreNMS will continue to function but stop receiving bug fixes and updates.
[FAIL]  The poller (edczenoss) has not completed within the last 5 minutes, check the cron job.
[WARN]  Some devices have not been polled in the last 5 minutes. You may have performance issues.
        [FIX] Check your poll log and see: http://docs.librenms.org/Support/Performance/
        Devices:
         localhost
         10.10.30.10
         10.10.103.10
         10.10.105.10
         10.10.4.10
         10.10.21.10
         10.10.112.10
         10.10.123.10
         10.10.14.10
         10.10.68.10
         10.10.142.10
         10.10.82.10
         10.10.120.10
         10.10.19.10
         10.10.85.10
          and 213 more...
fatal: No names found, cannot describe anything.