Heres an even easier re-create
$ url=http://cloud-images.ubuntu.com/cosmic/current/cosmic-server-cloudimg-amd64.img $ img=${url##*/} $ wget "${url}" -O "$img"
$ sudo mount-image-callback "$img" -- \ mchroot sh -xc 'echo overlayroot=tmpfs > $1 && echo root:$2 | chpasswd' \ setup-image /etc/overlayroot.local.conf passw0rd
## launch qemu with whatever parms you want. ## I might suggest using (or learning) '-nographic' or '-snapshot' ## Simplist thing is: $ qemu-system-x86_64 -enable-kvm -hda cosmic-server-cloudimg-amd64.img -m 2048
Heres an even easier re-create
$ url=http:// cloud-images. ubuntu. com/cosmic/ current/ cosmic- server- cloudimg- amd64.img
$ img=${url##*/}
$ wget "${url}" -O "$img"
$ sudo mount-image- callback "$img" -- \ t.local. conf passw0rd
mchroot sh -xc 'echo overlayroot=tmpfs > $1 && echo root:$2 | chpasswd' \
setup-image /etc/overlayroo
## launch qemu with whatever parms you want. server- cloudimg- amd64.img -m 2048
## I might suggest using (or learning) '-nographic' or '-snapshot'
## Simplist thing is:
$ qemu-system-x86_64 -enable-kvm -hda cosmic-