How to configure the network in CentOS 8
< Configure firewall and SELinux | Enable and disable services >
To begin with, set a hostname. If you didn't set a hostname during installation you can do it like this. If you already did it you can skip this step.
[root@localhost ~]# hostnamectl set-hostname server
To get a list of devices on your machine you can use nmcli.
[root@localhost ~]# nmcli device
DEVICE TYPE STATE CONNECTION
ens2 ethernet connected ens2
lo loopback unmanaged --
To set the IPv4 address of i.e. ens2, you can do it like this:
[root@localhost ~]# nmcli connection modify ens2 ipv4.addresses 10.0.0.30/24
To set the gateway:
[root@localhost ~]# nmcli connection modify ens2 ipv4.gateway 10.0.0.1
To set the DNS:
[root@localhost ~]# nmcli connection modify ens2 ipv4.dns 10.0.0.1
You can set manual for static setting (or "auto" for DHCP)
[root@localhost ~]# nmcli connection modify ens2 ipv4.method manual
Next restart the interface to apply the settings.
[root@localhost ~]# nmcli connection down ens2; nmcli connection up ens2
Connection 'ens2' successfully deactivated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/1)
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/2)
You can verify the settings like this:
[root@localhost ~]# nmcli device show ens2
GENERAL.DEVICE: ens2
GENERAL.TYPE: ethernet
GENERAL.HWADDR: 52:54:00:D0:8F:0B
GENERAL.MTU: 1500
GENERAL.STATE: 100 (connected)
GENERAL.CONNECTION: ens2
GENERAL.CON-PATH: /org/freedesktop/NetworkManager/ActiveC>
WIRED-PROPERTIES.CARRIER: on
IP4.ADDRESS[1]: 10.0.0.30/24
IP4.GATEWAY: 10.0.0.1
IP4.ROUTE[1]: dst = 10.0.0.0/24, nh = 0.0.0.0, mt = 1>
IP4.ROUTE[2]: dst = 0.0.0.0/0, nh = 10.0.0.1, mt = 100
IP4.DNS[1]: 10.0.0.10
IP6.ADDRESS[1]: fe80::5054:ff:fed0:8f0b/64
IP6.GATEWAY: --
IP6.ROUTE[1]: dst = fe80::/64, nh = ::, mt = 100
IP6.ROUTE[2]: dst = ff00::/8, nh = ::, mt = 256, tabl>
You can also use ip to see the state of ens2.
[root@localhost ~]# ip addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 52:54:00:d0:8f:0b brd ff:ff:ff:ff:ff:ff
inet 10.0.0.30/24 brd 10.0.0.255 scope global noprefixroute ens2
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fed0:8f0b/64 scope link noprefixroute
valid_lft forever preferred_lft forever
< Configure firewall and SELinux | Enable and disable services >