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251 lines
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251 lines
8.6 KiB
Markdown
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[#]: collector: (lujun9972)
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[#]: translator: ( )
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (Different Ways to Configure Static IP Address in RHEL 8)
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[#]: via: (https://www.linuxtechi.com/configure-static-ip-address-rhel8/)
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[#]: author: (Pradeep Kumar https://www.linuxtechi.com/author/pradeep/)
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Different Ways to Configure Static IP Address in RHEL 8
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======
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While Working on **Linux Servers**, assigning Static IP address on NIC / Ethernet cards is one of the common tasks that every Linux engineer do. If one configures the **Static IP address** correctly on a Linux server then he/she can access it remotely over network. In this article we will demonstrate what are different ways to assign Static IP address on RHEL 8 Server’s NIC.
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[![Configure-Static-IP-RHEL8][1]][2]
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Following are the ways to configure Static IP on a NIC,
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* nmcli (command line tool)
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* Network Scripts files(ifcfg-*)
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* nmtui (text based user interface)
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### Configure Static IP Address using nmcli command line tool
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Whenever we install RHEL 8 server then ‘**nmcli**’, a command line tool is installed automatically, nmcli is used by network manager and allows us to configure static ip address on Ethernet cards.
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Run the below ip addr command to list Ethernet cards on your RHEL 8 server
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```
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[root@linuxtechi ~]# ip addr
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```
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![ip-addr-command-rhel8][1]
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As we can see in above command output, we have two NICs enp0s3 & enp0s8. Currently ip address assigned to the NIC is via dhcp server.
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Let’s assume we want to assign the static IP address on first NIC (enp0s3) with the following details,
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* IP address = 192.168.1.4
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* Netmask = 255.255.255.0
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* Gateway= 192.168.1.1
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* DNS = 8.8.8.8
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Run the following nmcli commands one after the another to configure static ip,
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List currently active Ethernet cards using “**nmcli connection**” command,
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```
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[root@linuxtechi ~]# nmcli connection
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NAME UUID TYPE DEVICE
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enp0s3 7c1b8444-cb65-440d-9bf6-ea0ad5e60bae ethernet enp0s3
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virbr0 3020c41f-6b21-4d80-a1a6-7c1bd5867e6c bridge virbr0
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[root@linuxtechi ~]#
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```
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Use beneath nmcli command to assign static ip on enp0s3,
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**Syntax:**
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# nmcli connection modify <interface_name> ipv4.address <ip/prefix>
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**Note:** In short form, we usually replace connection with ‘con’ keyword and modify with ‘mod’ keyword in nmcli command.
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Assign ipv4 (192.168.1.4) to enp0s3 interface,
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```
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[root@linuxtechi ~]# nmcli con mod enp0s3 ipv4.addresses 192.168.1.4/24
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[root@linuxtechi ~]#
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```
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Set the gateway using below nmcli command,
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```
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[root@linuxtechi ~]# nmcli con mod enp0s3 ipv4.gateway 192.168.1.1
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[root@linuxtechi ~]#
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```
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Set the manual configuration (from dhcp to static),
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```
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[root@linuxtechi ~]# nmcli con mod enp0s3 ipv4.method manual
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[root@linuxtechi ~]#
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```
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Set DNS value as “8.8.8.8”,
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```
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[root@linuxtechi ~]# nmcli con mod enp0s3 ipv4.dns "8.8.8.8"
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[root@linuxtechi ~]#
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```
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To save the above changes and to reload the interface execute the beneath nmcli command,
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```
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[root@linuxtechi ~]# nmcli con up enp0s3
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Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/4)
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[root@linuxtechi ~]#
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```
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Above command output confirms that interface enp0s3 has been configured successfully.Whatever the changes we have made using above nmcli commands, those changes is saved permanently under the file “etc/sysconfig/network-scripts/ifcfg-enp0s3”
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```
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[root@linuxtechi ~]# cat /etc/sysconfig/network-scripts/ifcfg-enp0s3
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```
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![ifcfg-enp0s3-file-rhel8][1]
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To Confirm whether IP address has been to enp0s3 interface use the below ip command,
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```
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[root@linuxtechi ~]#ip addr show enp0s3
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```
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### Configure Static IP Address manually using network-scripts (ifcfg-) files
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We can configure the static ip address to an ethernet card using its network-script or ‘ifcfg-‘ files. Let’s assume we want to assign the static ip address on our second Ethernet card ‘enp0s8’.
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* IP= 192.168.1.91
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* Netmask / Prefix = 24
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* Gateway=192.168.1.1
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* DNS1=4.2.2.2
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Go to the directory “/etc/sysconfig/network-scripts” and look for the file ‘ifcfg- enp0s8’, if it does not exist then create it with following content,
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```
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[root@linuxtechi ~]# cd /etc/sysconfig/network-scripts/
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[root@linuxtechi network-scripts]# vi ifcfg-enp0s8
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TYPE="Ethernet"
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DEVICE="enp0s8"
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BOOTPROTO="static"
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ONBOOT="yes"
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NAME="enp0s8"
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IPADDR="192.168.1.91"
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PREFIX="24"
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GATEWAY="192.168.1.1"
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DNS1="4.2.2.2"
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```
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Save and exit the file and then restart network manager service to make above changes into effect,
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```
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[root@linuxtechi network-scripts]# systemctl restart NetworkManager
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[root@linuxtechi network-scripts]#
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```
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Now use below ip command to verify whether ip address is assigned to nic or not,
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```
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[root@linuxtechi ~]# ip add show enp0s8
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3: enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
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link/ether 08:00:27:7c:bb:cb brd ff:ff:ff:ff:ff:ff
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inet 192.168.1.91/24 brd 192.168.1.255 scope global noprefixroute enp0s8
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valid_lft forever preferred_lft forever
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inet6 fe80::a00:27ff:fe7c:bbcb/64 scope link
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valid_lft forever preferred_lft forever
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[root@linuxtechi ~]#
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```
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Above output confirms that static ip address has been configured successfully on the NIC ‘enp0s8’
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### Configure Static IP Address using ‘nmtui’ utility
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nmtui is a text based user interface for controlling network manager, when we execute nmtui, it will open a text base user interface through which we can add, modify and delete connections. Apart from this nmtui can also be used to set hostname of your system.
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Let’s assume we want to assign static ip address to interface enp0s3 with following details,
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* IP address = 10.20.0.72
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* Prefix = 24
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* Gateway= 10.20.0.1
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* DNS1=4.2.2.2
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Run nmtui and follow the screen instructions, example is show
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```
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[root@linuxtechi ~]# nmtui
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```
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[![nmtui-rhel8][1]][3]
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Select the first option ‘**Edit a connection**‘ and then choose the interface as ‘enp0s3’
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[![Choose-interface-nmtui-rhel8][1]][4]
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Choose Edit and then specify the IP address, Prefix, Gateway and DNS Server ip,
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[![set-ip-nmtui-rhel8][1]][5]
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Choose OK and hit enter. In the next window Choose ‘**Activate a connection**’
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[![Activate-option-nmtui-rhel8][1]][6]
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Select **enp0s3**, Choose **Deactivate** & hit enter
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[![Deactivate-interface-nmtui-rhel8][1]][7]
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Now choose **Activate** & hit enter,
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[![Activate-interface-nmtui-rhel8][1]][8]
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Select Back and then select Quit,
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[![Quit-Option-nmtui-rhel8][1]][9]
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Use below IP command to verify whether ip address has been assigned to interface enp0s3
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```
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[root@linuxtechi ~]# ip add show enp0s3
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2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
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link/ether 08:00:27:53:39:4d brd ff:ff:ff:ff:ff:ff
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inet 10.20.0.72/24 brd 10.20.0.255 scope global noprefixroute enp0s3
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valid_lft forever preferred_lft forever
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inet6 fe80::421d:5abf:58bd:c47e/64 scope link noprefixroute
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valid_lft forever preferred_lft forever
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[root@linuxtechi ~]#
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```
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Above output confirms that we have successfully assign the static IP address to interface enp0s3 using nmtui utility.
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That’s all from this tutorial, we have covered three different ways to configure ipv4 address to an Ethernet card on RHEL 8 system. Please do not hesitate to share feedback and comments in comments section below.
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--------------------------------------------------------------------------------
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via: https://www.linuxtechi.com/configure-static-ip-address-rhel8/
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作者：[Pradeep Kumar][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://www.linuxtechi.com/author/pradeep/
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[b]: https://github.com/lujun9972
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[1]: data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7
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[2]: https://www.linuxtechi.com/wp-content/uploads/2019/09/Configure-Static-IP-RHEL8.jpg
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[3]: https://www.linuxtechi.com/wp-content/uploads/2019/09/nmtui-rhel8.jpg
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[4]: https://www.linuxtechi.com/wp-content/uploads/2019/09/Choose-interface-nmtui-rhel8.jpg
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[5]: https://www.linuxtechi.com/wp-content/uploads/2019/09/set-ip-nmtui-rhel8.jpg
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[6]: https://www.linuxtechi.com/wp-content/uploads/2019/09/Activate-option-nmtui-rhel8.jpg
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[7]: https://www.linuxtechi.com/wp-content/uploads/2019/09/Deactivate-interface-nmtui-rhel8.jpg
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[8]: https://www.linuxtechi.com/wp-content/uploads/2019/09/Activate-interface-nmtui-rhel8.jpg
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[9]: https://www.linuxtechi.com/wp-content/uploads/2019/09/Quit-Option-nmtui-rhel8.jpg
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