System logging 400 Logging to specific terminal of given user system login user txt Local user account #include illegal characters in user #include Logging to remote host Invalid host (FQDN or IP address) ipv4 Remote syslog server IPv4 address ipv6 Remote syslog server IPv6 address hostname Remote syslog server FQDN #include 514 #include #include Logging format Allows for the transmission of all characters inside a syslog message Logging to system standard location #include mark messages sent to syslog time interval how often a mark message is being sent in seconds 1200 uses FQDN for logging Logging to a file [a-zA-Z0-9\-_.]{1,255} illegal characters in filename or filename longer than 255 characters Log file size and rotation characteristics Number of saved files [0-9]+ illegal characters in number of files 5 Size of log files in kbytes [0-9]+ illegal characters in size 256 #include logging to serial console #include #include