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This should open a window, next select " Activate a Connection" to update the network configuration Activate a connection To de-activate or activate a network interface using nmtui, execute nmtui as root user on the Linux server terminal # nmtui Users who are not comfortable with nmcli command line, they can use nmtui to manage their network We also have NetworkManager TUI which is an alternative to nmcli command. # nmcli con down eth1 & nmcli con up eth1Ĭonnection 'eth1' successfully deactivated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/14)Ĭonnection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/15) With nmcli we can also use nmcli con up or con down similar to traditional ifup and ifdown to de-activate and activate individual network interface instead of restarting all the networking interfaces on the server. IMPORTANT: It is important that you execute the command in this format as if you try to execute separately then your server may become unreachable as the first command will bring down all the NetworkManager managed interfaces This command will bring down all the NetworkManager interfaces and then will bring them up. # nmcli networking off & nmcli networking on We can also use the command-line tool " nmcli networking" for controlling NetworkManager to restart network and update network configuration. Since network-scripts is added just to support fallback behaviour, it throws WARNING every time you use ifup or ifdown without NetworkManager. WARN : It is advised to switch to 'NetworkManager' instead - it provides 'ifup/ifdown' scripts as well. WARN : 'network-scripts' will be removed in one of the next major releases of RHEL. WARN : You are using 'ifdown' script provided by 'network-scripts', which are now deprecated. Next you can use ifdown eth1 & ifup eth1 # ifdown eth1 & ifup eth1 Now ifup is part of both NetworkManager and network-scripts rpm. Next you can check the rpm ownership for ifup # rpm -qf `which ifup`
On RHEL system you must have an active subscription to RHN or you can configure a local offline repository using which "yum" package manager can install the provided rpm and it's dependencies. Use nmcli con show to list the active connections There are couple of methods to verify if your Ethernet is configured via NetworkManager or manually using ip command or some other method:
How to check if interface is configured with NetworkManager But before we jump there, let us understand if our interface is managed by NetworkManager or not as your command and steps to restart network would vary accordingly. Now considering all these changes, we have multiple methods which we can use to restart network in RHEL/CentOS release. I have already written a detailed guide on this topic and the steps to use legacy network restart commands. This is because with RHEL/CentOS 7, the network scripts were part of initscripts rpm, which is removed as part of RHEL/CentOS 8 and is migrated to network-scripts rpm Now all the system services, partitions, sockets are handled by systemd. But that is a different topic altogether, now with RHEL/CentOS 7 we used # systemctl restart networkīut with RHEL/CentOS 8 we get below error for this command # systemctl restart networkįailed to restart rvice: Unit rvice not found. With RHEL/CentOS 7 the SysV scripts are deprecated (although you may still use these commands but they can be removed any time and shouldn't be used).