Monitor system information Monitor last lines of messages file SYSTEMD_COLORS=false journalctl --no-hostname --follow --boot Output log in a colored fashion SYSTEMD_COLORS=true journalctl --no-hostname --follow --boot Monitor last lines of certbot log bash -c 'if test -f /var/log/letsencrypt/letsencrypt.log; then tail --follow=name /var/log/letsencrypt/letsencrypt.log; else echo "Cerbot log does not exist"; fi' Monitor last lines of conntrack-sync log journalctl --no-hostname --follow --boot --unit conntrackd.service Monitor last lines of console server log journalctl --no-hostname --follow --boot --unit conserver-server.service Monitor last lines of Dynamic Host Control Protocol log Monitor last lines of DHCP server log journalctl --no-hostname --follow --boot --unit isc-kea-dhcp4-server.service Monitor last lines of DHCP server log on specific vrf journalctl --no-hostname --follow --boot --unit "isc-kea-dhcp4-server@$6.service" Monitor last lines of DHCP client log journalctl --no-hostname --follow --boot --unit "dhclient@*.service" Show DHCP client log on specific interface journalctl --no-hostname --follow --boot --unit "dhclient@$6.service" Monitor last lines of Dynamic Host Control Protocol IPv6 log Monitor last lines of DHCPv6 server log journalctl --no-hostname --follow --boot --unit isc-kea-dhcp6-server.service Monitor last lines of DHCPv6 server log on specific vrf journalctl --no-hostname --follow --boot --unit "isc-kea-dhcp6-server@$6.service" Monitor last lines of DHCPv6 client log journalctl --no-hostname --follow --boot --unit "dhcp6c@*.service" Show DHCPv6 client log on specific interface journalctl --no-hostname --follow --boot --unit "dhcp6c@$6.service" Monitor last lines of messages file and filter by specified facility kern user mail daemon auth syslog lpr news uucp cron authpriv ftp local0 local1 local2 local3 local4 local5 local6 local7 SYSTEMD_COLORS=false journalctl --no-hostname --follow --boot --facility=$4 Monitor last lines of flow-accounting log journalctl --no-hostname --boot --dmesg -g '^(ipt_NETFLOW|netflow): ' --follow Monitor last lines of FRRouting suite log journalctl --no-hostname --boot --follow --unit frr.service Monitor last lines of HAProxy log journalctl --no-hostname --boot --follow --unit haproxy.service Monitor last lines of IGMP multicast proxy journalctl --no-hostname --boot --follow --unit igmpproxy.service Monitor last lines of IP over Ethernet server log journalctl --no-hostname --boot --follow --unit accel-ppp@ipoe.service Monitor last lines of Linux Kernel log journalctl --no-hostname --boot --follow --dmesg Monitor last lines of Neighbor Discovery Protocol (NDP) Proxy journalctl --no-hostname --boot --follow --unit ndppd.service Monitor last lines of Network Time Protocol log journalctl --no-hostname --boot --follow --unit chrony.service Monitor last lines of OpenVPN log journalctl --no-hostname --boot --follow --unit openvpn@*.service Monitor last lines of specific OpenVPN interface log interfaces openvpn journalctl --no-hostname --boot --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 Monitor last lines of messages file and filter by minimum priority level (includes all higher severities) emerg alert crit err warning notice info debug SYSTEMD_COLORS=false journalctl --no-hostname --follow --boot --priority=$4 Monitor routing protocol logs Monitor log for OSPF journalctl --follow --no-hostname --boot /usr/lib/frr/ospfd Monitor log for OSPF for IPv6 journalctl --follow --no-hostname --boot /usr/lib/frr/ospf6d Monitor log for BGP journalctl --follow --no-hostname --boot /usr/lib/frr/bgpd Monitor log for RIP journalctl --follow --no-hostname --boot /usr/lib/frr/ripd Monitor log for RIPng journalctl --follow --no-hostname --boot /usr/lib/frr/ripngd Monitor log for static route journalctl --follow --no-hostname --boot /usr/lib/frr/staticd Monitor log for Multicast protocol journalctl --follow --no-hostname --boot /usr/lib/frr/pimd Monitor log for ISIS journalctl --follow --no-hostname --boot /usr/lib/frr/isisd Monitor log for OpenFabric journalctl --follow --no-hostname --boot /usr/lib/frr/fabricd Monitor log for NHRP journalctl --follow --no-hostname --boot /usr/lib/frr/nhrpd Monitor log for BFD journalctl --follow --no-hostname --boot /usr/lib/frr/bfdd Monitor log for MPLS journalctl --follow --no-hostname --boot /usr/lib/frr/ldpd Monitor last lines of MACsec journalctl --no-hostname --boot --follow --unit "wpa_supplicant-macsec@*.service" Monitor last lines of specific MACsec interface interfaces macsec journalctl --no-hostname --boot --follow --unit "wpa_supplicant-macsec@`cli-shell-api returnEffectiveValue interfaces macsec $5 source-interface`.service" Monitor last lines of Router Advertisement Daemon log journalctl --no-hostname --boot --follow --unit radvd.service Monitor last lines of Simple Network Monitoring Protocol log journalctl --no-hostname --boot --follow --unit snmpd.service Monitor last lines of Secure Shell log journalctl --no-hostname --boot --follow --unit ssh.service Monitor last lines of SSH guard log journalctl --no-hostname --boot --follow --unit sshguard.service Monitor last lines of ALL Virtual Private Network services journalctl --no-hostname --boot --follow --unit strongswan.service --unit accel-ppp@*.service --unit ocserv.service Monitor last lines of IPsec log journalctl --no-hostname --boot --follow --unit strongswan.service Monitor last lines of L2TP log journalctl --no-hostname --boot --follow --unit accel-ppp@l2tp.service Monitor last lines of OpenConnect log journalctl --no-hostname --boot --follow --unit ocserv.service Monitor last lines of PPTP log journalctl --no-hostname --boot --follow --unit accel-ppp@pptp.service Monitor last lines of Secure Socket Tunneling Protocol server journalctl --no-hostname --boot --follow --unit accel-ppp@sstp.service Monitor last lines of Secure Socket Tunneling Protocol client journalctl --no-hostname --boot --follow --unit "ppp@sstpc*.service" Monitor last lines of SSTP client log for specific interface interfaces sstpc journalctl --no-hostname --boot --follow --unit "ppp@$5.service" Monitor last lines of Virtual Router Redundancy Protocol log journalctl --no-hostname --boot --follow --unit keepalived.service Monitor last lines of VyOS configuration daemon log journalctl --no-hostname --boot --follow --unit vyos-configd.service Monitor last lines of VyOS domain resolver daemon log journalctl --no-hostname --boot --follow --unit vyos-domain-resolver.service Monitor last lines of Wireless interface log Monitor last lines of WPA supplicant journalctl --no-hostname --boot --follow --unit "wpa_supplicant@*.service" Monitor last lines of specific wireless interface supplicant interfaces wireless journalctl --no-hostname --boot --follow --unit "wpa_supplicant@$6.service" Monitor last lines of host access point daemon journalctl --no-hostname --boot --follow --unit "hostapd@*.service" Monitor last lines of specific host access point interface interfaces wireless journalctl --no-hostname --boot --follow --unit "hostapd@$6.service"