Resize 問題

1. resize 時出現以下錯誤訊息：

   [root@controller ~]# openstack server resize --flavor m4.crt crtv8
   No valid host was found. No valid host found for resize (HTTP 400) ...
   

2. 查詢紀錄檔沒有足夠的 hosts 可用。

   [root@controller ~]# grep -i 'not enough' -R /var/log/nova/ 
   /var/log/nova/nova-conductor.log:....... NoValidHost_Remote: \
   No valid host was found. There are not enough hosts available.
   

3. 原因為硬碟空間、CPU 或記憶體。

   [root@controller ~]# grep -i 'not enough' -R /var/log/nova/ 
   /var/log/nova/nova-conductor.log:....... NoValidHost_Remote: \
   No valid host was found. There are not enough hosts available.
   

4. 解決方式：若沒有實體空間或記憶體可調整，可更改 nova 設定硬碟空間、CPU 及記憶體配置為2倍。

   [root@controller ~]# grep allocation_ratio /etc/nova/nova.conf
   cpu_allocation_ratio=2.0
   ram_allocation_ratio=2.0
   disk_allocation_ratio=2.0
   

5. 重新啟動 openstack-nova-* 服務，再 resize instance，成功resize。

   [root@controller ~]# systemctl restart openstack-nova-*
   

6. 再執行 server resize，成功完成。

   [root@controller ~]# openstack server resize --flavor m4.crt crtv8 --wait
   Complete
   

7. server crtv8 已改用 m4.crt flavor。

   [root@controller ~]# openstack server list --flavor m4.crt -c Name
   +-------+
   | Name  |
   +-------+
   | crtv8 |
   +-------+