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proxmox/proxmox-fix-vmbr0-nic.sh

@@ -1,8 +1,16 @@
 #!/bin/bash
 
-# Try to fix vmbr0 / GUI access after a NIC name change
+# Try to fix vmbr0 / GUI access on IP:8006 after a NIC name change
 # 2024.May kneutron
 
+# DEPENDS: find grep awk sed netstat
+
+# PROTIP - run ' screen ' or ' tmux ' before running this script if the interface name is long,
+#   you can copypasta with just the keyboard - see appropriate man pages
+
+# In GNU screen: Hit ^[, cursor move to start of new interface name, hit spacebar to begin mark, cursor to end of NIC name, 
+#   then hit spacebar to end mark, ^] to paste
+
 cd /etc/network/
 cp -v interfaces interfaces.$(date +%Y%m%d@%H%M).bak
 cp -v interfaces interfaces.MODME
@@ -22,29 +30,57 @@ grep -A 7 vmbr0 /etc/network/interfaces
 oldiface=$(grep -m 1 bridge-ports /etc/network/interfaces |awk '{print $2}')
 echo "This appears to be the OLD interface for vmbr0: $oldiface"
 
+echo '====='
 echo "Please enter which new interface name to use for vmbr0:"
 read useinterface
+echo ''
+echo "Replacing $oldiface with $useinterface in temporary MODME file - NOTE you are just modifiying a copy,"
+echo "  the original interfaces file is still in place"
+echo ''
+echo "NOTE no fix has actually been implemented yet, you can still back out"
 
+# not global, only 1st match
 sed -i "s/bridge-ports $oldiface/bridge-ports $useinterface/" interfaces.MODME
 
+echo '====='
 grep -m 1 bridge-ports interfaces.MODME
 ls -lh /etc/network/interfaces /etc/network/interfaces.MODME
 
-echo "The original interfaces file has been backed up!"
+echo '====='
+echo "NOTE The original interfaces file has been backed up!"
 ls -lh *bak
 
-echo "Hit ^C to backout, or Enter to replace interfaces file with the modified one and restart networking:"
+echo '====='
+echo "Nothing has been modified / fixed yet, you are still in safe mode"
+echo "Hit ^C to backout, or Enter to replace the interfaces file with the fixed one and restart networking:"
 read
 
-cp -v interfaces.MODME interfaces
-systemctl restart networking
 
+# Teh Main Thing
+echo ''
+echo "$(date) - Applying the fix"
+cp -v interfaces.MODME interfaces
+echo "$(date) - Restarting networking service to apply the change"
+time systemctl restart networking
+
+echo "$(date) - Restarting pveproxy service to make sure port 8006 is listening"
+time systemctl restart pveproxy
+# probably not necessary, but why not
+
+# verify web GUI listening port
+netstat -plant |grep 8006 |head -n 2
+
+echo '====='
 ip a |grep vmbr0 |grep -v tap 
 
+echo "You should now be able to ping the above IP address and get to the Proxmox Web interface."
+date;
+
 exit;
 
+===================
 
-Difficulty: getting this onto your proxmox server
+Difficulty: getting this script onto your proxmox server without network
 Solution: Copy script to USB disk or burn to ISO
 Dont forget to ' chmod +x ' it before running it as root
 
@@ -77,6 +113,7 @@ iface vmbr0 inet static
 This appears to be the OLD interface for vmbr0: enp4s0
 Please enter which new interface name to use for vmbr0:
 eno1
+
         bridge-ports eno1
 -rw-r--r-- 1 root root 1.7K Apr  1 14:52 /etc/network/interfaces
 -rw-r--r-- 1 root root 1.7K May  2 12:12 /etc/network/interfaces.MODME
@@ -96,6 +133,14 @@ Hit ^C to backout, or Enter to replace interfaces file with the modified one and
     
 You should now be able to ping 192.168.1.186 and get to the Proxmox Web interface.
 
-NOTE - Script is a bit primitive, probably does not cover all network interface names, tested Ok in VM
+NOTE - Script is a bit primitive, makes several assumptions about interfaces file being in a certain order,
+  probably does not cover all network interface names, tested Ok in VM
+
 Feedback is welcome :)
 
+=====
+
+Written for PVE 8.2.2, may work with other versions
+
+V2 - extra text, formatting, commenting, features - restart pveproxy and check for listening 8006 port
+Reassure end-user that no changes are actually being implemented until they hit enter to confirm