From 4a49c91528f687964a48aa2be7055d296d641ab2 Mon Sep 17 00:00:00 2001
From: ayakael <dev@ayakael.net>
Date: Wed, 10 Sep 2025 03:47:29 +0000
Subject: [PATCH] Add Change the IP Address of a Proxmox Clustered Node

---
 ...-IP-Address-of-a-Proxmox-Clustered-Node.md | 97 +++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 Change-the-IP-Address-of-a-Proxmox-Clustered-Node.md

diff --git a/Change-the-IP-Address-of-a-Proxmox-Clustered-Node.md b/Change-the-IP-Address-of-a-Proxmox-Clustered-Node.md
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@@ -0,0 +1,97 @@
+### If changing entire subnet:
+(e.g. 192.168.1.0/24 to 192.168.2.0/24)
+```
+# Stop the cluster services
+systemctl stop pve-cluster
+systemctl stop corosync
+
+# Mount the filesystem locally
+pmxcfs -l
+
+# Edit the network interfaces file to have the new IP information
+# Be sure to replace both the address and gateway
+vi /etc/network/interfaces
+
+# Replace any host entries with the new IP addresses
+vi /etc/hosts
+
+# Change the DNS server as necessary
+vi /etc/resolv.conf
+
+# Edit the corosync file and replace the old IPs with the new IPs for all hosts
+# :%s/192\.168\.1\./192.168.2./g   <- vi command to replace all instances
+# BE SURE TO INCREMENT THE config_version: x LINE BY ONE TO ENSURE THE CONFIG IS NOT OVERWRITTEN
+vi /etc/pve/corosync.conf
+
+# Edit the known hosts file to have the correct IPs
+# :%s/192\.168\.1\./192.168.2./g   <- vi command to replace all instances
+/etc/pve/priv/known_hosts
+
+# If using ceph, edit the ceph configuration file to reflect the new network
+# (thanks u/FortunatelyLethal)
+# :%s/192\.168\.1\./192.168.2./g   <- vi command to replace all instances
+vi /etc/ceph/ceph.conf
+
+# If you want to be granular... fix the IP in /etc/issue
+vi /etc/issue
+
+# Verify there aren't any stragglers with the old IP hanging around
+cd /etc
+grep -R '192\.168\.1\.' *
+cd /var
+grep -R '192\.168\.1\.' *
+
+# Reboot the system to cleanly restart all the networking and services
+reboot
+
+# Referenced pages:
+# - https://forum.proxmox.com/threads/change-cluster-nodes-ip-addresses.33406/
+# - https://pve.proxmox.com/wiki/Cluster_Manager#_remove_a_cluster_node
+```
+### If changing only the IP:
+(e.g. 192.168.1.10/24 to 192.168.1.20/24)
+
+```
+# Stop the cluster services
+systemctl stop pve-cluster
+systemctl stop corosync
+
+# Mount the filesystem locally
+pmxcfs -l
+
+# Edit the network interfaces file to have the new IP information
+vi /etc/network/interfaces
+
+# Replace any host entries with the new IP addresses
+vi /etc/hosts
+
+# Edit the corosync file and replace the old IPs with the new IPs for any changed hosts
+# BE SURE TO INCREMENT THE config_version: x LINE BY ONE TO ENSURE THE CONFIG IS NOT OVERWRITTEN
+vi /etc/pve/corosync.conf
+
+# Edit the known hosts file to have the new IP(s)
+/etc/pve/priv/known_hosts
+
+# If using ceph, edit the ceph configuration file to reflect the new network
+# (thanks u/FortunatelyLethal)
+# :%s/192\.168\.1\./192.168.2./g   <- vi command to replace all instances
+vi /etc/ceph/ceph.conf
+
+# If you want to be granular... fix the IP in /etc/issue
+vi /etc/issue
+
+# Verify there aren't any stragglers with the old IP hanging around
+cd /etc
+grep -R '192\.168\.1\.' *
+cd /var
+grep -R '192\.168\.1\.' *
+
+# Reboot the system to cleanly restart all the networking and services
+reboot
+
+# Referenced pages:
+# - https://forum.proxmox.com/threads/change-cluster-nodes-ip-addresses.33406/
+# - https://pve.proxmox.com/wiki/Cluster_Manager#_remove_a_cluster_node
+```
+
+From: https://bookstack.dismyserver.net/books/documentation/page/how-to-change-the-ip-address-of-a-proxmox-clustered-node
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