Chapter 29. Introduction to NetworkManager Debugging

1. Updating modified connection settings without deactivation or restart of a network interface.
2. Removing pending changes from the modified connection settings. As NetworkManager does not revert the manual changes, you can reconfigure the device and revert external or manual parameters.
3. Creating different modified connection settings than that of the existing connection settings.

Procedure

1. To disable rate-limiting, edit the /etc/systemd/journald.conf file, uncomment the RateLimitBurst parameter in the [Journal] section, and set its value as 0:

   RateLimitBurst=0

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2. Restart the systemd-journald service.

   # systemctl restart systemd-journald

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3. Create the /etc/NetworkManager/conf.d/95-nm-debug.conf file with the following content:

   [logging]
   domains=ALL:TRACE

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   The domains parameter can contain multiple comma-separated domain:level pairs.

4. Restart the NetworkManager service.

   # systemctl restart NetworkManager

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Procedure

1. Optional: Display the current logging settings:

   # nmcli general logging
     LEVEL  DOMAINS
     INFO   PLATFORM,RFKILL,ETHER,WIFI,BT,MB,DHCP4,DHCP6,PPP,WIFI_SCAN,IP4,IP6,A
   UTOIP4,DNS,VPN,SHARING,SUPPLICANT,AGENTS,SETTINGS,SUSPEND,CORE,DEVICE,OLPC,
   WIMAX,INFINIBAND,FIREWALL,ADSL,BOND,VLAN,BRIDGE,DBUS_PROPS,TEAM,CONCHECK,DC
   B,DISPATCH

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2. To modify the logging level and domains, use the following options:

   • To set the log level for all domains to the same LEVEL, enter:

     # nmcli general logging level LEVEL domains ALL

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   • To change the level for specific domains, enter:

     # nmcli general logging level LEVEL domains DOMAINS

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     Note that updating the logging level using this command disables logging for all the other domains.

   • To change the level of specific domains and preserve the level of all other domains, enter:

     # nmcli general logging level KEEP domains DOMAIN:LEVEL,DOMAIN:LEVEL

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