Openstack 에서 운영중인 VM 용량 늘리기

Flavor 를 변경하는 방법과 disk 파일의 크기를 직접 늘려주는 방법이 있는데, 여기에서는 disk 파일 크기를 바로 변경하는 더 쉬운 방법을 안내 드리겠습니다.

 

변경하고자 하는 master 라는 이름의 VM 이 어느 컴퓨트 노드에 있는지 확인합니다.

(Controller 서버에서)

# openstack server show master |grep hostname
| OS-EXT-SRV-ATTR:hypervisor_hostname | compute1                                                 |

 

(해당 컴퓨트 노드에서)

사용중인 VM 의 PID 값 확인 후 종료합니다.

# ps -ef|grep disk
root        1110       1  0 02:37 ?        00:00:00 /usr/libexec/udisks2/udisksd
libvirt+    2788       1 99 02:38 ?        00:00:08 /usr/bin/qemu-system-x86_64 -name guest=instance-00000006,debug-threads=on -S -object {"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain-1-instance-00000006/master-key.aes"} -machine pc-i440fx-6.2,usb=off,dump-guest-core=off,memory-backend=pc.ram -accel kvm -cpu Skylake-Client-IBRS,ss=on,vmx=on,pdcm=on,hypervisor=on,tsc-adjust=on,clflushopt=on,umip=on,md-clear=on,stibp=on,arch-capabilities=on,ssbd=on,xsaves=on,pdpe1gb=on,ibpb=on,ibrs=on,amd-stibp=on,amd-ssbd=on,rsba=on,skip-l1dfl-vmentry=on,pschange-mc-no=on,hle=off,rtm=off -m 8192 -object {"qom-type":"memory-backend-ram","id":"pc.ram","size":8589934592} -overcommit mem-lock=off -smp 4,sockets=4,dies=1,cores=1,threads=1 -uuid f6aa6879-0ea4-4be8-a610-d1abcd60c9ab -smbios type=1,manufacturer=OpenStack Foundation,product=OpenStack Nova,version=25.2.0,serial=f6aa6879-0ea4-4be8-a610-d1abcd60c9ab,uuid=f6aa6879-0ea4-4be8-a610-d1abcd60c9ab,family=Virtual Machine -no-user-config -nodefaults -chardev socket,id=charmonitor,fd=31,server=on,wait=off -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet -no-shutdown -boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -blockdev {"driver":"file","filename":"/var/lib/nova/instances/_base/bf15376deac35c8c707e130fb5d70882999b77d2","node-name":"libvirt-2-storage","cache":{"direct":true,"no-flush":false},"auto-read-only":true,"discard":"unmap"} -blockdev {"node-name":"libvirt-2-format","read-only":true,"cache":{"direct":true,"no-flush":false},"driver":"raw","file":"libvirt-2-storage"} -blockdev {"driver":"file","filename":"/var/lib/nova/instances/f6aa6879-0ea4-4be8-a610-d1abcd60c9ab/disk","node-name":"libvirt-1-storage","cache":{"direct":true,"no-flush":false},"auto-read-only":true,"discard":"unmap"} -blockdev {"node-name":"libvirt-1-format","read-only":false,"cache":{"direct":true,"no-flush":false},"driver":"qcow2","file":"libvirt-1-storage","backing":"libvirt-2-format"} -device virtio-blk-pci,bus=pci.0,addr=0x4,drive=libvirt-1-format,id=virtio-disk0,bootindex=1,write-cache=on -netdev tap,fd=34,id=hostnet0,vhost=on,vhostfd=36 -device virtio-net-pci,host_mtu=1450,netdev=hostnet0,id=net0,mac=fa:16:3e:cb:7e:47,bus=pci.0,addr=0x3 -add-fd set=3,fd=33 -chardev pty,id=charserial0,logfile=/dev/fdset/3,logappend=on -device isa-serial,chardev=charserial0,id=serial0 -device usb-tablet,id=input0,bus=usb.0,port=1 -device usb-kbd,id=input1,bus=usb.0,port=2 -audiodev {"id":"audio1","driver":"none"} -vnc 127.0.0.1:0,audiodev=audio1 -device virtio-vga,id=video0,max_outputs=1,bus=pci.0,addr=0x2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 -object {"qom-type":"rng-random","id":"objrng0","filename":"/dev/urandom"} -device virtio-rng-pci,rng=objrng0,id=rng0,bus=pci.0,addr=0x6 -device vmcoreinfo -sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny -msg timestamp=on
root        2836    2649  0 02:38 pts/1    00:00:00 grep --color=auto disk

 

# kill -9 2788

 

인스턴스 디렉토리로 들어가 disk 파일의 사이즈를 20G 더 늘려줍니다.

# cd /var/lib/nova/instances/f6aa6879-0ea4-4be8-a610-d1abcd60c9ab

# qemu-img resize disk +20G

Image resized.

 

(Controller 서버에서)

중지되었던 VM 을 다시 가동합니다.

# openstack server start master

 

(VM 에서)

용량 확인 명령으로 초기 20GB 에서 20GB 더 늘린 40GB 사용이 확인되었습니다.

root@master:~# df -h
Filesystem      Size  Used Avail Use% Mounted on
tmpfs           794M  1.7M  793M   1% /run
/dev/vda1        39G   19G   21G  48% /
tmpfs           3.9G     0  3.9G   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
/dev/vda15      105M  6.1M   99M   6% /boot/efi
tmpfs           794M  4.0K  794M   1% /run/user/1000