Difference between /var/log/messages and /var/log/dmesg log files
/var/log/messages – This file contains global system messages, including the messages that are logged during system startup. There are several things that are logged in /var/log/messages including mail, cron, daemon, kern, auth, etc. [root@localhost ~]# cat /var/log/messages Apr 17 20:30:03 localhost rsyslogd: [origin software="rsyslogd" swVersion="8.24.0-34.el7" x-pid="9423" x-info="http://www.rsyslog.com"] rsyslogd was HUPed Apr 17 20:40:02 localhost systemd: Started Session 9 of user root. Apr 17 20:40:32 localhost dhclient[9217]: DHCPREQUEST on ens33 to 192.168.189.254 port 67 (xid=0xde4e9a7) Apr 17 20:40:32 localhost dhclient[9217]: DHCPACK from 192.168.189.254 (xid=0xde4e9a7) Apr 17 20:40:32 localhost NetworkManager[8908]: <info> [1555513832.8097] dhcp4 (ens33): address 192.168.189.128 Apr 17 20:40:32 localhost NetworkManager[8908]: <info> [1555513832.8107] dhcp4 (ens33): plen 24 (255.255.255.0) Apr 17 20:40:32 ...