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178 lines
5.5 KiB
ReStructuredText
.. _syslog:
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Syslog
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------
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Per default VyOSs has minimal syslog logging enabled which is stored and
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rotated locally. Errors will be always logged to a local file, which includes
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`local7` error messages, emergency messages will be sent to the console, too.
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To configure syslog, you need to switch into configuration mode.
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Logging to serial console
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^^^^^^^^^^^^^^^^^^^^^^^^^
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The below would log all messages to :code:`/dev/console`.
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.. code-block:: console
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set system syslog console facility all level all
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Use the **[tab]** function to display all facilities and levels which can
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be configured.
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.. code-block:: console
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vyos@vyos# set system syslog console facility <TAB>
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Possible completions:
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> all All facilities excluding "mark"
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> auth Authentication and authorization
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> authpriv Non-system authorization
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> cron Cron daemon
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> daemon System daemons
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> kern Kernel
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> lpr Line printer spooler
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> mail Mail subsystem
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> mark Timestamp
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> news USENET subsystem
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> protocols depricated will be set to local7
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> security depricated will be set to auth
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> syslog Authentication and authorization
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> user Application processes
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> uucp UUCP subsystem
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> local0 Local facility 0
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> local1 Local facility 1
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> local2 Local facility 2
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> local3 Local facility 3
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> local4 Local facility 4
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> local5 Local facility 5
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> local6 Local facility 6
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> local7 Local facility 7
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vyos@vyos# set system syslog console facility all level <TAB>
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Possible completions:
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emerg Emergency messages
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alert Urgent messages
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crit Critical messages
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err Error messages
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warning Warning messages
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notice Messages for further investigation
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info Informational messages
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debug Debug messages
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all Log everything
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Logging to a custom file
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^^^^^^^^^^^^^^^^^^^^^^^^^
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Logging to a custom file, rotation size and the number of rotate files left
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on the system can be configured.
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.. code-block:: console
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set system syslog file <FILENAME> facility <FACILITY> level <LEVEL>
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set system syslog file <FILENAME> archive file <NUMBER OF FILES>
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set system syslog file FILENAME archive size <FILESIZE>
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The very same setting can be applied to the global configuration, to modify
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the defaults for the global logging.
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Logging to a remote host
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^^^^^^^^^^^^^^^^^^^^^^^^
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Logging to a remote host leaves the local logging configuration intact, it
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can be configured in parallel. You can log ro multiple hosts at the same time,
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using either TCP or UDP. The default is sending the messages via UDP.
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**UDP**
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.. code-block:: console
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set system syslog host 10.1.1.1 facility all level all
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<optional>
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set system syslog host 10.1.1.1 facility all protocol udp
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**TCP**
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.. code-block:: console
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set system syslog host 10.1.1.2 facility all level all
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set system syslog host 10.1.1.2 facility all protocol tcp
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Logging to a local user account
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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If logging to a local useraccount is configured, all defined log messages are
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display on the console if the local user is logged in, if the user is not
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logged in, no messages are being displayed.
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.. code-block:: console
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set system syslog user <LOCAL_USERNAME> facility <FACILITY> level <LEVEL>
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Show logs
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^^^^^^^^^
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Display log files on the console
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.. code-block:: console
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vyos@vyos:~$ show log
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Possible completions:
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<Enter> Execute the current command
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all Show contents of all master log files
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authorization Show listing of authorization attempts
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cluster Show log for Cluster
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conntrack-sync
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Show log for Conntrack-sync
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dhcp Show log for Dynamic Host Control Protocol (DHCP)
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directory Show listing of user-defined log files
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dns Show log for Domain Name Service (DNS)
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file Show contents of user-defined log file
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firewall Show log for Firewall
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https Show log for Https
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image Show logs from an image
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lldp Show log for Lldp
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nat Show log for Network Address Translation (NAT)
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openvpn Show log for Openvpn
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snmp Show log for Simple Network Monitoring Protocol (SNMP)
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tail Monitor last lines of messages file
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vpn Show log for Virtual Private Network (VPN)
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vrrp Show log for Virtual Router Redundancy Protocol (VRRP)
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webproxy Show log for Webproxy
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Show contents of a log file in an image
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Log messages from a specified image can be displayed on the console:
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.. code-block:: console
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$ show log image <image name>
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$ show log image <image name> [all | authorization | directory | file <file name> | tail <lines>]
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Details of allowed parameters:
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.. list-table::
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:widths: 25 75
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:header-rows: 0
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* - all
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- Display contents of all master log files of the specified image
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* - authorization
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- Display all authorization attempts of the specified image
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* - directory
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- Display list of all user-defined log files of the specified image
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* - file <file name>
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- Display contents of a specified user-defined log file of the specified image
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* - tail
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- Display last lines of the system log of the specified image
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* - <lines>
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- Number of lines to be displayed, default 10
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When no options/parameters are used, the contents of the main syslog file are displayed.
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