This can be prevented by configuring a key NM_CONTROLLED=no in the ifcfg file. When you called ifup, the script would check whether NetworkManager is running and manages the profile, in which case the script will call nmcli connection up to let NetworkManager handle it. Also initscripts on Fedora/RHEL started to integrate with NetworkManager. Consequently, NetworkManager persisted its connection profiles also in ifcfg format because users were already familiar with the format and because it already existed. When NetworkManager was first introduced at around 2004, initscripts and ifcfg was the way to configure the network on Fedora Core. Providing such an API is the main reason why NetworkManager exists. Such an API is not well suited to build applications that configure the network, like a GUI or cockpit. The scripts simply don’t know the current state. Or calling ifup twice in a row can lead to errors. For example if you change the DEVICE= name in the ifcfg file that is currently up, ifdown wouldn’t know that there was something to tear down. Yes, you can also manually call ifup and ifdown to apply changes, but that might not reliably work in subtle cases. Another problem is that their API essentially is to have users write an ifcfg file and reboot. This is a fundamental limitation, despite that they leave some state for the next time when they run - like the PID file of dhclient or an IP address configured on an interface. But they are one-shot commands that do their task and quit. But the scripts can also start ISC’s dhclient to do DHCP, in which case the DHCP daemon keeps running in the background.Īs such, initscripts are a simple thing that work well for what they are. They do so by calling iproute2 (the ip tool) to setup interfaces and IP addresses in kernel. The network-scripts part of initscripts are really a bunch of shell scripts that parse ifcfg files (by executing them as shell scripts) and configure the network accordingly. These files are the “profiles” in the sense that they are configurations for a network interface. On Fedora and RHEL, users would edit files like /etc/sysconfig/network-scripts/ifcfg-eth0 according to the documentation. One part of initscripts is concerned about network and provides two scripts ifup and ifdown and a SysV-style init service network. For example, the Fedora variant is (un)maintained at github/fedora-sysv. The very short version of the history is that various Linux distributions use the System V “initscripts” for system configuration and management. Eliška no longer uses ifcfg files with NetworkManager. Let’s take a look at the history and future of the ifcfg-rh format. Currently two file formats exists for that purpose: keyfile and ifcfg-rh. A profile is just a bunch of settings and configuration values with defined keys and values, that can be sent over D-Bus or persisted to disk. It’s all about connection profiles, which are created by the user and “activated” by NetworkManager. NetworkManager is a daemon for configuring the network on Linux.
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