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+NetworkManager stores new network profiles in keyfile format in the
+/etc/NetworkManager/system-connections/ directory.
+
+Previously, NetworkManager stored network profiles in ifcfg format
+in this directory (/etc/sysconfig/network-scripts/). However, the ifcfg
+format is deprecated. By default, NetworkManager no longer creates
+new profiles in this format.
+
+Connection profiles in keyfile format have many benefits. For example,
+this format is INI file-based and can easily be parsed and generated.
+
+Each section in NetworkManager keyfiles corresponds to a NetworkManager
+setting name as described in the nm-settings(5) and nm-settings-keyfile(5)
+man pages. Each key-value-pair in a section is one of the properties
+listed in the settings specification of the man page.
+
+If you still use network profiles in ifcfg format, consider migrating
+them to keyfile format. To migrate all profiles at once, enter:
+
+# nmcli connection migrate
+
+This command migrates all profiles from ifcfg format to keyfile
+format and stores them in /etc/NetworkManager/system-connections/.
+
+Alternatively, to migrate only a specific profile, enter:
+
+# nmcli connection migrate <profile_name|UUID|D-Bus_path>
+
+For further details, see:
+* nm-settings-keyfile(5)
+* nmcli(1)
+
+Interface renaming
+==================
+
+Connection profiles stored in ifcfg-rh format support the renaming of
+interfaces via udev. This is done via a helper tool
+/usr/lib/udev/rename_device that is invoked by udev to parse the files
+in /etc/sysconfig/network-scripts; when the HWADDR and DEVICE
+variables are set, the interface that matches the MAC address in
+HWADDR is renamed to the name specified in DEVICE.
+
+Connections in keyfile format don't provide the same integration with
+udev. The renaming of interfaces must be configured directly in udev,
+for example by creating a file:
+
+  /etc/systemd/network/70-rename.link
+
+with content:
+
+  [Match]
+  MACAddress=00:11:22:33:44:56
+
+  [Link]
+  Name=ethernet1
+
+Alternatively, a udev rule can also be used, such as:
+
+  /etc/udev/rules.d/70-interface-names.rules
+
+with content:
+
+  SUBSYSTEM=="net",ACTION=="add",ATTR{address}=="00:11:22:33:44:56",ATTR{type}=="1",NAME="ethernet1"