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Next, double-check that there were no errors by running the following command:
sudo systemctl status isc-dhcp-server 
The daemon should report that it's 
active (running)
, similar to what's shown in the 
following screenshot:
Figure 11.3: Checking the status of the isc-dhcp-server process after a successful start
Assuming all went well, your DHCP server should be running. When an IP lease is 
assigned to a client, it will be recorded in the 
/var/lib/dhcp/dhcpd.leases
 file. While 
your DHCP server runs, it will also record information to your server's system log, 
located at 
/var/log/syslog
. To see your DHCP server function in all its glory, you 
can follow the log as it gets written to with the following:
sudo tail -f /var/log/syslog 
We've discussed the 
-f
 flag of the 
tail
 command earlier in the book. This option 
is indispensable, and it's something you'll likely use quite often as a server 
administrator. With the 
-f
 option, you'll watch the log as it gets written to, rather 
than needing to refresh it manually. You can press 
Ctrl
 + 
c
 to break out of the file.
While your DHCP server runs, you'll see notices appear within the 
syslog
 file 
whenever a DHCP request was received and when a lease is offered to a client. A 
typical DHCP request will appear in the log similar to the following:
Oct  5 22:07:36 myserver dhcpd: DHCPDISCOVER from 52:54:00:88:f8:bc via 
enp0s3 
Oct  5 22:07:36 myserver dhcpd: DHCPOFFER on 192.168.1.103 to 
51:52:01:87:f7:bc via enp0s3 

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Setting Up Network Services