**Official Guide**
https://pve.proxmox.com/wiki/Renaming_a_PVE_node
# 1-A. 공식 가이드에 따른 설정 방법
```
#1. hostname 변경
nano /etc/hostname
#2. hosts 변경
nano /etc/hosts
#3. postfix 수정
nano /etc/postfix/main.cf
#4. 재부팅 전 설정 이동
mv /etc/pve/nodes/126K /etc/pve/nodes/139K
reboot
```
# 1-B. hostname / hosts 변경 후 재부팅 해서 꼬인 경우
```
#1. (126K에서) 캐시 삭제
ls -l /var/lib/rrdcached/db/pve-node-9.0
ls -l /var/lib/rrdcached/db/pve-storage-9.0
ls -l /var/lib/rrdcached/db/pve-vm-9.0
rm -rf /var/lib/rrdcached/db/pve-node-9.0/139K
rm -rf /var/lib/rrdcached/db/pve-storage-9.0/139K
rm -rf /var/lib/rrdcached/db/pve-vm-9.0/139K
#2. 공식 가이드에 따른 설정 1/2/3단계만 진행
nano /etc/hostname
nano /etc/hosts
nano /etc/postfix/main.cf
reboot
#3. /etc/pve/nodes 이동
mv /etc/pve/nodes/126K/qemu-server/*.conf /etc/pve/nodes/139K/qemu-server/
```
# 2. 이후 설정
```
# 1. 인증서 업데이트
pvecm updatecerts
reboot
# 2. storage.cfg 확인 -> 출력되는 결과 있을시, 수정.
grep -n '126K' /etc/pve/storage.cfg
```
참고자료
https://forum.proxmox.com/threads/proxmox-node-name-change.14327/
https://forum.proxmox.com/threads/proxmox-renaming.85161
https://forum.proxmox.com/threads/error-of-node-name-after-hostname-changed.105301/
https://forum.proxmox.com/threads/changing-hostname-and-ip-of-non-empty-pve-host.112068/