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How To: Change the IP Address of a Proxmox Clustered Node

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
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