Monitor last lines of messages file tail --follow=name /var/log/messages Output log in a colored fashion grc tail --follow=name /var/log/messages Show log for Dynamic Host Control Protocol (DHCP) Show log for DHCP server journalctl --no-hostname --boot --follow --unit isc-dhcp-server.service Show DHCP client logs journalctl --no-hostname --boot --follow --unit "dhclient@*.service" Show DHCP client log on specific interface journalctl --no-hostname --boot --follow --unit "dhclient@$6.service" Show log for Dynamic Host Control Protocol IPv6 (DHCPv6) Show log for DHCPv6 server journalctl --no-hostname --boot --follow --unit isc-dhcp-server6.service Show DHCPv6 client logs journalctl --no-hostname --boot --follow --unit "dhcp6c@*.service" Show DHCPv6 client log on specific interface journalctl --no-hostname --boot --follow --unit "dhcp6c@$6.service" Show log for HTTPs journalctl --no-hostname --boot --follow --unit nginx.service Monitor last lines of IPoE server log journalctl --no-hostname --boot --follow --unit accel-ppp@ipoe.service Show log for LLDP journalctl --no-hostname --boot --follow --unit lldpd.service Show log for OpenVPN journalctl --no-hostname --boot --follow --unit openvpn@*.service Show OpenVPN log on specific interface interfaces openvpn journalctl --no-hostname --boot --follow --unit openvpn@$5.service Monitor last lines of PPPoE interface log journalctl --no-hostname --boot --follow --unit "ppp@pppoe*.service" Monitor last lines of PPPoE log for specific interface interfaces pppoe journalctl --no-hostname --boot --follow --unit "ppp@$5.service" Monitor last lines of PPPoE server log journalctl --no-hostname --boot --follow --unit accel-ppp@pppoe.service Show log for Simple Network Monitoring Protocol (SNMP) journalctl --no-hostname --boot --follow --unit snmpd.service Show log for Virtual Router Redundancy Protocol (VRRP) journalctl --no-hostname --boot --follow --unit keepalived.service Show log for Webproxy journalctl --no-hostname --boot --follow --unit squid.service