eth-if-names.md

+# Ethernet Interface names
+
+1. The Grub Bootloader needs a flag, to forget about the actual IF names.
+
+1.1 for diskless nodes, add in  file `pxelinux.cfg/default` to the append line `net.ifnames=0`
+
+1.2 on disk installations, update all files vim `/etc/sysconfig/network-scripts/ifcfg-*`, update grub config `/etc/default/grub` and add to the line GRUB_CMDLINE_LINUX at the end `net.ifnames=0`, rebuild grub afterwards with `grub2-mkconfig -o /boot/grub2/grub.cfg`
+
+```
+# change computenode network interface names
+cd /etc/sysconfig/network-scripts/
+mv ifcfg-eth0 ifcfg-ethctrl
+sed -i 's/eth0/ethctrl/' ifcfg-ethctrl
+mv ifcfg-eth1 ifcfg-ethdata
+sed -i 's/eth1/ethdata/' ifcfg-ethdata
+```
+2. Tell udev to rewrite. Create `/etc/udev/rules.d/70-persistent-net.rules` with:
+
+```
+SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:1e:67:39:84:04", ATTR{type}=="1", KERNEL=="eth*", NAME="ethdata"
+SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:1e:67:39:84:03", ATTR{type}=="1", KERNEL=="eth*", NAME="ethctrl"
+```
+
+Change the MAC address to the right ones ...
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