Linux Tutorials

How you can configure a static IP tackle on RHEL eight

I am a brand new sysadmin and RHEL eight person. My system is configured to make use of DHCP. How can I swap from DHCP to a static IP tackle on RHEL eight system? How do I setup a static TCP/IP tackle on my Crimson Hat Enterprise Linux eight server utilizing command line choice?

Introduction: Community scripts deprecated in RHEL eight. You should use NetworkManager by way of the nmcli command. The default RHEL eight comes with a brand new model of the ifup and ifdown scripts which calls nmcli. The process to configure a static IP tackle on RHEL eight: Create a file named /and so on/sysconfig/network-scripts/ifcfg-eth0 as follows:DEVICE=eth0BOOTPROTO=noneONBOOT=yesPREFIX=24IPADDR=192.168.2.203Restart community service on RHEL eight: systemctl restart NetworkManager OR sudo nmcli connection reload

Allow us to see all instructions in particulars.

How do I begin / cease / restart NetworkManager?

sudo systemctl begin NetworkManager
sudo systemctl cease NetworkManager
sudo systemctl restart NetworkManager
systemctl standing NetworkManager
Starting Stopping Restating NetworkManager on RHEL 8

How do I checklist community interfaces in RHEL eight?

One can use ip command as follows:
$ ip a present
Pattern outputs:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
hyperlink/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.zero.zero.1/eight scope host lo
valid_lft perpetually preferred_lft perpetually
inet6 ::1/128 scope host
valid_lft perpetually preferred_lft perpetually
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
hyperlink/ether 52:54:00:ef:59:b8 brd ff:ff:ff:ff:ff:ff
inet 192.168.122.229/24 brd 192.168.122.255 scope world dynamic noprefixroute ens3
valid_lft 2275sec preferred_lft 2275sec
inet6 fe80::5054:ff:feef:59b8/64 scope hyperlink noprefixroute
valid_lft perpetually preferred_lft perpetually

Another choice is to run:
$ nmcli gadget standing
$ nmcli gadget present ens3
RHEL 8 find out network interface names
To see the NetworkManager connections, run:
$ nmcli connection
Here’s a typical DHCP configration for ens3 (saved in /and so on/sysconfig/network-scripts/ifcfg-ens3 file):
$ cat /and so on/sysconfig/network-scripts/ifcfg-ens3
Pattern outputs:

# Generated by dracut initrd
NAME=“ens3”
DEVICE=“ens3”
ONBOOT=“sure”
NETBOOT=“sure”
UUID=“6fdb13a0-1592-4992-a09e-632c23fb0d0f”
IPV6INIT=“sure”
BOOTPROTO=“dhcp”
TYPE=“Ethernet”
PROXY_METHOD=“none”
BROWSER_ONLY=“no”
DEFROUTE=“sure”
IPV4_FAILURE_FATAL=“no”
IPV6_AUTOCONF=“sure”
IPV6_DEFROUTE=“sure”
IPV6_FAILURE_FATAL=“no”

How do I configure an ens3 interface with static community settings (technique # 1)?

One can run the next nmcli instructions. Allow us to set static IPv4 IP tackle to 192.168.122.20/24:
sudo nmcli con mod ens3 ipv4.addresses 192.168.122.20/24
sudo nmcli con mod ens3 ipv4.gateway 192.168.122.1
sudo nmcli con mod ens3 ipv4.technique guide
sudo nmcli con mod ens3 ipv4.dns “192.168.2.254”
sudo nmcli con up ens3

Viewing up to date config file

Simply run the next cat command:
$ cat /and so on/sysconfig/network-scripts/ifcfg-ens3
Pattern outputs:

# Generated by dracut initrd
NAME=ens3
DEVICE=ens3
ONBOOT=sure
NETBOOT=“sure”
UUID=6fdb13a0-1592-4992-a09e-632c23fb0d0f
IPV6INIT=sure
BOOTPROTO=none
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
DEFROUTE=sure
IPV4_FAILURE_FATAL=no
IPV6_AUTOCONF=sure
IPV6_DEFROUTE=sure
IPV6_FAILURE_FATAL=no
IPADDR=192.168.122.20
PREFIX=24
GATEWAY=192.168.122.1
DNS1=192.168.2.254

For those who edit /and so on/sysconfig/network-scripts/ifcfg-ens3 file utilizing a textual content editor, you should reload modifications utilizing any one of many following command:
$ sudo nmcli connection reload ## reload all connections ##
$ sudo mcli con load /and so on/sysconfig/network-scripts/ifcfg-ens3 ## reload solely ens3 by config file ##
$ sudo nmcli con up ens3 ## reload by connection title
Confirm connectivity with ping command and host command/dig command:
$ ip r
$ ip a present ens3
$ ping -c4 192.168.2.254
$ host cyberciti.biz
Verify static IP config on RHEL 8

How do I configure an ens3 interface with static community settings utilizing nmtui on Crimson Hat Enterprise Linux eight (technique # 2)?

One can use the nmtui command. It’s a curses primarily based TUI software for interacting with NetworkManager. To indicate a connection editor that helps including, modifying, viewing and deleting connections. To view or setup a static IP utilizing this software for ens0, enter:
$ sudo nmtui
$ sudo nmtui edit ens3
Static IP address on RHEL 8 config using nmtui command

Conclusion

With RHEl eight you should use NetworkManager instruments and functions to configure networking. nmcli is a command-line software which allows customers and scripts to work together with NetworkManager. It should be used on servers the place GUI not put in by default. Another choice for server customers is to make use of TUI software known as nmtui.

Posted by: Vivek Gite

The writer is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a coach for the Linux working system/Unix shell scripting. Get the newest tutorials on SysAdmin, Linux/Unix and open supply subjects by way of RSS/XML feed or weekly e mail publication.

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