CentOS 8 custom image 생성
드디어 CentOS 8 이 release 되었습니다. (2019-09-24)
이것 저것 새로운 기능들을 테스트 해보고 싶은 욕망에 fast-vm 에서 사용할 custom image 를 생성해 보도록 하겠습니다.
Custom image 생성
아직 CentOS 8 의 fast-vm public image 는 아직 추가가 안 되었습니다.
하지만 RHEL 8 을 통해 CentOS 8 image 를 생성 할 수 있습니다.
여담으로
fast-vm의 개발자, @ondrej 에게 공식 public image upload 를 요청 하였습니다.
테스트 로그도 첨부 하였죠! issue #10 - request addCentOS 8fast-vm-public-image
Download CentOS 8 iso image
$ cd /tmp;wget http://mirror.kakao.com/centos/8.0.1905/isos/x86_64/CentOS-8-x86_64-1905-dvd1.iso
Download rhel 8 hackfile, xml, kickstart-ks
$ wget https://raw.githubusercontent.com/OndrejHome/fast-vm-public-images/master/centos/xml/centos-6.3-current.xml
$ wget https://raw.githubusercontent.com/OndrejHome/fast-vm-public-images/master/rhel/ks/virt-install-rhel-8.sh
$ wget https://raw.githubusercontent.com/OndrejHome/fast-vm-public-images/master/rhel/hacks/6g_rhel-8-hacks.sh
$ wget https://raw.githubusercontent.com/OndrejHome/fast-vm-public-images/master/rhel/ks/rhel-8.ks
Change rhel 8 to CentOS 7 (filename 및 내용 변경)
[root@test-vm-host centos-8.0]# diff centos-8.ks rhel-8.ks
35,37c35,37
++ volgroup c8vg --pesize=4096 pv.1
++ logvol swap --fstype="swap" --size=256 --name=swap_lv --vgname=c8vg
++ logvol / --fstype="xfs" --size=5000 --name=root_lv --vgname=c8vg
---
-- volgroup r8vg --pesize=4096 pv.1
-- logvol swap --fstype="swap" --size=256 --name=swap_lv --vgname=r8vg
-- logvol / --fstype="xfs" --size=5000 --name=root_lv --vgname=r8vg
[root@test-vm-host centos-8.0]# diff virt-install-centos-8.sh virt-install-rhel-8.sh
9c9
++ --name centos-8-fastvm-install \
---
-- --name rhel-8-fastvm-install \
21c21
++ virsh --connect qemu:///system undefine centos-8-fastvm-install
---
-- virsh --connect qemu:///system undefine rhel-8-fastvm-install
[root@test-vm-host centos-8.0]# diff 6g_centos-8-hacks.sh 6g_rhel-8-hacks.sh
28c28
++ guestfish -a "/dev/$THINPOOL_VG/$VM_NAME" -m /dev/c8vg/root_lv -m /dev/sda1:/boot --selinux <<EOF
---
-- guestfish -a "/dev/$THINPOOL_VG/$VM_NAME" -m /dev/r8vg/root_lv -m /dev/sda1:/boot --selinux <<EOF
Create empty image
$ fast-vm import_custom_image 6 centos-8.0 empty centos-6.3-current.xml
virt-install 을 이용하여 base image 설치
$ ./virt-install-centos-8.sh /dev/c7vg/fastvm-centos-8.0 /tmp/CentOS-8-x86_64-1905-dvd1.iso centos-8.ks
- 설치 시작
- kickstart 를 기준으로 자동 설치
- 설치 완료
Export image
$ fast-vm export_image centos-8.0 gz
Remove empty image
$ fast-vm remove_image centos-8.0
Import custom image
## 6gb image 를 import 하기 위함.
$ mv centos-8.0.img.gz 6g__centos-8.0.img.gz
## import custom image
$ fast-vm import_image centos-8.0 6g__centos-8.0.img.gz centos-6.3-current.xml 6g_centos-8-hacks.sh
install libguestfs requirements
Import 한 image 를 이용하여 vm 을 생성하니 아래와 같은 에러가 발생 되었습니다.
- hackfile 에서
libguestfs확인 부분 삭제 case
- hackfile 에서
libguestfs추가된 부분
이 문제는 RHEL 8, CentOS 8 일부 시스템(RHEL/CentOS 7.x, libguestfs-appliance-1.38.0)에서 xfs 의 새로운 기능으로 인해 libguestfs 가 정상적으로 작동하지 못하여 발생되는 원인입니다.
설치 방법은 아래와 같습니다.
fast-vm 가이드 문서 : https://github.com/OndrejHome/fast-vm-public-images/tree/master/rhel
[root@test-vm-host centos-8.0]# mkdir /var/tmp/fedora29
[root@test-vm-host centos-8.0]# cd /var/tmp/fedora29/
[root@test-vm-host fedora29]# wget http://ftp.linux.cz/pub/linux/people/ondrej_famera/fastvm-images/appliance-1.39.11.tar.xz
[root@test-vm-host fedora29]# tar xvf appliance-1.39.11.tar.xz
appliance/
appliance/README.fixed
appliance/root
appliance/initrd
appliance/kernel
[root@test-vm-host fedora29]# echo 'x /var/tmp/fedora29' > /etc/tmpfiles.d/fast-vm-fedora29-appliance.conf
vm 생성 테스트
[root@test-vm-host fast-vm]# fast-vm create centos-8.0 77
[77][inf] using file /etc/fast-vm/config-centos-8.0.xml as libvirt XML
[77][inf] using file /etc/fast-vm/hacks-centos-8.0.sh as hack file
[77][inf] defining virtual machine 'fastvm-centos-8.0-77' in libvirt
fastvm-centos-8.0-77에서 정의된 도메인 /tmp/tmp.xkf30zZawx.xml
Domain title updated successfully
[77][inf] creating disk 'fastvm-centos-8.0-77'
[77][inf] adding static lease for 192.168.200.77 into libvirts DHCP
[77][inf] applying hacks from /etc/fast-vm/hacks-centos-8.0.sh
*stdin*:3: libguestfs: error: sh: mv: '/etc/sysconfig/network-scripts/ifcfg-ens3' and '/etc/sysconfig/network-scripts/ifcfg-ens3' are the same file
[77][wrn] there was issue applying hacks to this machine, check syslog for more details
[77][inf] applying hacks finished
[77][ok] VM 'fastvm-centos-8.0-77' created
[root@test-vm-host fast-vm]# fast-vm console 77
도메인 fastvm-centos-8.0-77에 연결되었습니다
Escape character is ^]
...
CentOS Linux 8 (Core)
Kernel 4.18.0-80.el8.x86_64 on an x86_64
fastvm-centos-8-0-77 login: root
Password:
Last login: Wed Sep 25 15:42:04 on ttyS0
[root@fastvm-centos-8-0-77 ~]# cat /etc/redhat-release
CentOS Linux release 8.0.1905 (Core)
[root@fastvm-centos-8-0-77 ~]# uname -a
Linux fastvm-centos-8-0-77 4.18.0-80.el8.x86_64 #1 SMP Tue Jun 4 09:19:46 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
[root@fastvm-centos-8-0-77 ~]#
위와 같이 정상적으로 CentOS 8 을 사용 할 수 있게 되었습니다.
참고 자료
- fast-vm guide : https://www.famera.cz/blog/fast-vm/user_guide.html
- fast-vm public image github : https://github.com/OndrejHome/fast-vm-public-images