CentOS 8 VM Image
[root@pm01 images]# wget https://cloud.centos.org/centos/8/x86_64/images/CentOS-8-GenericCloud-8.2.2004-20200611.2.x86_64.qcow2
[root@pm01 ~]# qemu-img info images/CentOS-8-GenericCloud-8.2.2004-20200611.2.x86_64.qcow2
image: images/CentOS-8-GenericCloud-8.2.2004-20200611.2.x86_64.qcow2
file format: qcow2
virtual size: 10G (10737418240 bytes)
disk size: 1.1G
cluster_size: 65536
Format specific information:
compat: 0.10
[root@pm01 ~]#
[root@pm01 ~]# cp -vp images/CentOS-8-GenericCloud-8.2.2004-20200611.2.x86_64.qcow2 /var/lib/libvirt/images/vm05.qcow2 ‘images/CentOS-8-GenericCloud-8.2.2004-20200611.2.x86_64.qcow2’ -> ‘/var/lib/libvirt/images/vm05.qcow2’ [root@pm01 ~]#
I resize VM Image from 10G to 20G.
[root@pm01 ~]# cd /var/lib/libvirt/images/ [root@pm01 images]# qemu-img resize vm05.qcow2 20G Image resized. [root@pm01 images]#
prepare for cloud-init
I get hashed pass by python command like below.
[root@pm01 images]# python -c 'import crypt,getpass; print(crypt.crypt(getpass.getpass(), crypt.mksalt(crypt.METHOD_SHA512)))' Password: <input password> <hashed pass> [root@pm01 images]#
I create cloud-confg file.
This file makes hostname "testnode" and creates "centos" user in a VM.
[root@pm01 images]# vi config.yaml
[root@pm01 images]# cat config.yaml
#cloud-config
fqdn: testnode
users:
- name: centos
groups: wheel
lock_passwd: false
passwd: '<hashed pass>'
shell: /bin/bash
sudo: ['ALL=(ALL) NOPASSWD:ALL']
[root@pm01 images]#
[root@pm01 images]# yum install -y cloud-utils *snip* Installed: cloud-utils.x86_64 0:0.27-20.el7.centos Dependency Installed: cloud-utils-growpart.noarch 0:0.29-5.el7 euca2ools.noarch 0:3.4.1-1.el7 python-lxml.x86_64 0:3.2.1-4.el7 python-progressbar.noarch 0:2.3-4.el7 python-requestbuilder.noarch 0:0.7.1-1.el7 rsync.x86_64 0:3.1.2-10.el7 Complete! [root@pm01 images]#
I generate config.iso file by cloud-localds command.
[root@pm01 images]# cloud-localds config.iso config.yaml wrote config.iso with filesystem=iso9660 and diskformat=raw [root@pm01 images]#
Unfortunantly, I could not find "CentOS 8".
[root@pm01 images]# osinfo-query os | grep -i centos centos5.0 | CentOS 5.0 | 5.0 | http://centos.org/centos/5.0 centos5.1 | CentOS 5.1 | 5.1 | http://centos.org/centos/5.1 centos5.10 | CentOS 5.10 | 5.10 | http://centos.org/centos/5.10 centos5.11 | CentOS 5.11 | 5.11 | http://centos.org/centos/5.11 centos5.2 | CentOS 5.2 | 5.2 | http://centos.org/centos/5.2 centos5.3 | CentOS 5.3 | 5.3 | http://centos.org/centos/5.3 centos5.4 | CentOS 5.4 | 5.4 | http://centos.org/centos/5.4 centos5.5 | CentOS 5.5 | 5.5 | http://centos.org/centos/5.5 centos5.6 | CentOS 5.6 | 5.6 | http://centos.org/centos/5.6 centos5.7 | CentOS 5.7 | 5.7 | http://centos.org/centos/5.7 centos5.8 | CentOS 5.8 | 5.8 | http://centos.org/centos/5.8 centos5.9 | CentOS 5.9 | 5.9 | http://centos.org/centos/5.9 centos6.0 | CentOS 6.0 | 6.0 | http://centos.org/centos/6.0 centos6.1 | CentOS 6.1 | 6.1 | http://centos.org/centos/6.1 centos6.10 | CentOS 6.10 | 6.10 | http://centos.org/centos/6.10 centos6.2 | CentOS 6.2 | 6.2 | http://centos.org/centos/6.2 centos6.3 | CentOS 6.3 | 6.3 | http://centos.org/centos/6.3 centos6.4 | CentOS 6.4 | 6.4 | http://centos.org/centos/6.4 centos6.5 | CentOS 6.5 | 6.5 | http://centos.org/centos/6.5 centos6.6 | CentOS 6.6 | 6.6 | http://centos.org/centos/6.6 centos6.7 | CentOS 6.7 | 6.7 | http://centos.org/centos/6.7 centos6.8 | CentOS 6.8 | 6.8 | http://centos.org/centos/6.8 centos6.9 | CentOS 6.9 | 6.9 | http://centos.org/centos/6.9 centos7.0 | CentOS 7 | 7 | http://centos.org/centos/7.0 [root@pm01 images]#
Excute command(virt-install) to create CentOS 8 with cloud-init on KVM.
I use above all information.
and then I prepare script file to create VM.
[root@pm01 kvm_work]# vi create_vm05.sh
[root@pm01 kvm_work]#
[root@pm01 kvm_work]# cat create_vm05.sh
#!/bin/bash
name=vm05
cpu=1
memory=4096
# disk=30
# cd /var/lib/libvirt/images/
# cp -vp CentOS-8-GenericCloud-8.2.2004-20200611.2.x86_64.qcow2 ${name}.qcow2
# qemu-img resize ${name}.qcow2 ${disk}G
virt-install \
--name=${name} \
--disk /var/lib/libvirt/images/${name}.qcow2,device=disk \
--disk /var/lib/libvirt/images/config.iso,device=cdrom \
--network network=default,model=virtio \
--vcpus=${cpu} \
--ram=${memory} \
--accelerate \
--hvm \
--virt-type kvm \
--graphics none \
--os-type Linux \
--arch=x86_64 \
--import
[root@pm01 kvm_work]#
Finally, CentOS 8 VM was created by cloud-init with cloud config on KVM.
and I can log in to this VM.
[root@pm01 kvm_work]# bash create_vm05.sh *snip* CentOS Linux 8 (Core) Kernel 4.18.0-193.6.3.el8_2.x86_64 on an x86_64 Activate the web console with: systemctl enable --now cockpit.socket testnode login: centos Password: [centos@testnode ~]$ id uid=1000(centos) gid=1000(centos) groups=1000(centos),10(wheel) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 [centos@testnode ~]$
