• How to configure a static IP address on CentOS 7(CentOS7静态IP地址设置)


    Question: On CentOS 7, I want to switch from DHCP to static IP address configuration with one of my network interfaces. What is a proper way to assign a static IP address to a network interface permanently on CentOS or RHEL 7?

    If you want to set up a static IP address on a network interface in CentOS 7, there are several different ways to do it, varying depending on whether or not you want to use Network Manager for that.

    Network Manager is a dynamic network control and configuration system that attempts to keep network devices and connections up and active when they are available). CentOS/RHEL 7 comes with Network Manager service installed and enabled by default.

    To verify the status of Network Manager service:

    $ systemctl status NetworkManager.service

    To check which network interface is managed by Network Manager, run:

    $ nmcli dev status

    If the output of nmcli shows "connected" for a particular interface (e.g., enp0s3 in the example), it means that the interface is managed by Network Manager. You can easily disable Network Manager for a particular interface, so that you can configure it on your own for a static IP address.

    Here are two different ways to assign a static IP address to a network interface on CentOS 7. We will be configuring a network interface named enp0s3.

    Configure a Static IP Address without Network Manager

    Go to the /etc/sysconfig/network-scripts directory, and locate its configuration file (ifcfg-enp0s3). Create it if not found.

    Open the configuration file and edit the following variables:

    In the above, "NM_CONTROLLED=no" indicates that this interface will be set up using this configuration file, instead of being managed by Network Manager service. "ONBOOT=yes" tells the system to bring up the interface during boot.


    Save changes and restart the network service using the following command:

    # systemctl restart network.service

    Now verify that the interface has been properly configured:

    # ip add

    Configure a Static IP Address with Network Manager

    If you want to use Network Manager to manage the interface, you can use nmtui (Network Manager Text User Interface) which provides a way to configure Network Manager in a terminal environment.

    Before using nmtui, first set "NM_CONTROLLED=yes" in /etc/sysconfig/network-scripts/ifcfg-enp0s3.

    Now let's install nmtui as follows.

    # yum install NetworkManager-tui

    Then go ahead and edit the Network Manager configuration of enp0s3 interface:

    # nmtui edit enp0s3

    The following screen will allow us to manually enter the same information that is contained in /etc/sysconfig/network-scripts/ifcfg-enp0s3.

    Use the arrow keys to navigate this screen, press Enter to select from a list of values (or fill in the desired values), and finally click OK at the bottom right:

    Finally, restart the network service.

    # systemctl restart network.service

    and you're ready to go.

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  • 原文地址:https://www.cnblogs.com/makai/p/5507905.html
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