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--- linux_wiki:persistent_interface_name [2016/06/08 23:33]
billdozor [Generate UUID]
+++ linux_wiki:persistent_interface_name [2019/05/25 23:50] (current)
@@ Line 3: / Line 3: @@
 **General Information**
-Persistent network interface names.
+Persistent network interface names prevent interfaces being renamed from "eth0" to "eth1" upon reboot.\\
+Instead, a name based upon BIOS/firmware information can be used if available.
 **Checklist**
@@ Line 10: / Line 11: @@
 ----
-====== Generate UUID ======
+====== Enable BIOS Device Names ======
-Generate a UUID for your network interface.<code bash>uuidgen <interface></code>
+Install biosdevname<code bash>yum install biosdevname</code>
-  * Example:<code bash>uuidgen eth0
-b4373-17a1-4193-99ed-cf7916ea25bd</code>
-Edit network interface config file and add the id.
+Enable biosdevname as a parameter passed to the kernel
-  * Example<code bash>vim /etc/sysconfig/network-scripts/ifcfg-eth0
+  * EL7<code bash>vim /etc/default/grub
-...other config lines...
-UUID=490b4373-17a1-4193-99ed-cf7916ea25bd</code>
+# Add to GRUB_CMDLINE_LINUX values
+GRUB_CMDLINE_LINUX="biosdevname=1"
+</code>
+  * EL6<code bash>vim /boot/grub/grub.conf
+# Append biosdevname=1 to all kernel lines. Example:
+kernel /vmlinuz-2.6.32-279.22.1.el6.x86_64 ro root=/dev/sda3 biosdevname=1
+</code>
+Update Grub config
+  * EL 7<code bash>grub2-mkconfig -o /boot/grub2/grub.cfg</code>
+  * EL 6: manual changes already made above.
+  * Ubuntu<code bash>update-grub</code>
+===== Naming Scheme Preference =====
+The following preference order is used for biosdevname:
+  - Firmware/BIOS index numbers for on board devices
+    - Example: eno2
+    - Not Available?: Fallback to number 2
+  - Firmware/BIOS provided PCI Express slot index numbers
+    - Example: ens2
+    - Not Available?: Fallback to number 3
+  - Physical Location of the connector
+    - Example: enp3s0
+    - Not Available?: Fallback to number 5
+  - Interfaces MAC address (not used by default, but can be user selected)
+    - Example: enx080027e468c1
+    - Not Available?: Fallback to number 5
+  - Traditional unpredictable naming
+    - Example: eth0
 ----