However, I ran into a problem trying to create and VM with virt-install. Every time it would fail and drop into emergency mode. Sample screen output below. The result was the same for both CentOS and Fedora. I did not try this with RedHat, but suspect the results will be the same.
The creation CLI:
# virt-install -n testvm --vcpus 1 --memory 1024 \
--disk path=/var/lib/libvirt/images/testvm.img,size=8,format=raw \
--location=http://192.168.1.177/centos --noreboot \
--noautoconsole -x 'console=ttyS0 ks=http://192.168.1.177/ks.cfg'
# virsh console testvm
...
[ 34.668127] dracut-initqueue[947]: curl: (23) Failed writing body (4350 != 16384)
[ 35.538991] loop: module loaded
[ 35.670688] dracut-initqueue[947]: mount: wrong fs type, bad option, bad superblock on /dev/loop0,
[ 35.674472] dracut-initqueue[947]: missing codepage or helper program, or other error
[ 35.677472] dracut-initqueue[947]: In some cases useful info is found in syslog - try
[ 35.678199] dracut-initqueue[947]: dmesg | tail or so.
[ 35.710336] dracut-initqueue[947]: umount: /run/initramfs/squashfs: not mounted
[ 35.774186] dracut-initqueue[947]: /sbin/dmsquash-live-root: line 286: printf: write error: No space left on device
[ 36.734669] dracut-initqueue[947]: % Total % Received % Xferd Average Speed Time Time Time Current
[ 36.742602] dracut-initqueue[947]: Dload Upload Total Spent Left Speed
100 1033 100 1033 0 0 54302 0 --:--:-- --:--:-- --:--:-- 57388 0 --:--:-- --:--:-- --:--:-- 0
[ 37.930641] dracut-initqueue[947]: Traceback (most recent call last):
[ 37.935047] dracut-initqueue[947]: File "/sbin/parse-kickstart", line 688, in
[ 37.938548] dracut-initqueue[947]: outfile, output = process_kickstart(path)
[ 37.941385] dracut-initqueue[947]: File "/sbin/parse-kickstart", line 675, in process_kickstart
[ 37.945262] dracut-initqueue[947]: processed_file = preprocessKickstart(ksfile)
[ 37.946152] dracut-initqueue[947]: File "/usr/lib/python2.7/site-packages/pykickstart/parser.py", line 136, in preprocessKickstart
[ 37.947140] dracut-initqueue[947]: rc = _preprocessStateMachine (iter(fh.readlines()))
[ 37.947751] dracut-initqueue[947]: File "/usr/lib/python2.7/site-packages/pykickstart/parser.py", line 81, in _preprocessStateMachine
[ 37.949683] dracut-initqueue[947]: os.write(outF, l)
[ 37.951503] dracut-initqueue[947]: OSError: [Errno 28] No space left on device
...
[ 32.216242] dracut-initqueue[947]: % Total % Received % Xferd Average Speed Time Time Time Current
[ 32.222391] dracut-initqueue[947]: Dload Upload Total Spent Left Speed
76 432M 76 330M 0 0 135M 0 0:00:03 0:00:02 0:00:01 135M 0 --:--:-- --:--:-- --:--:-- 0
[ 34.668127] dracut-initqueue[947]: curl: (23) Failed writing body (4350 != 16384)
[ 35.670688] dracut-initqueue[947]: mount: wrong fs type, bad option, bad superblock on /dev/loop0,
[ 35.674472] dracut-initqueue[947]: missing codepage or helper program, or other error
[ 35.677472] dracut-initqueue[947]: In some cases useful info is found in syslog - try
[ 35.678199] dracut-initqueue[947]: dmesg | tail or so.
[ 35.710336] dracut-initqueue[947]: umount: /run/initramfs/squashfs: not mounted
[ 35.774186] dracut-initqueue[947]: /sbin/dmsquash-live-root: line 286: printf: write error: No space left on device
[ 36.734669] dracut-initqueue[947]: % Total % Received % Xferd Average Speed Time Time Time Current
[ 36.742602] dracut-initqueue[947]: Dload Upload Total Spent Left Speed
100 1033 100 1033 0 0 54302 0 --:--:-- --:--:-- --:--:-- 57388 0 --:--:-- --:--:-- --:--:-- 0
[ 37.930641] dracut-initqueue[947]: Traceback (most recent call last):
[ 37.935047] dracut-initqueue[947]: File "/sbin/parse-kickstart", line 688, in
[ 37.938548] dracut-initqueue[947]: outfile, output = process_kickstart(path)
[ 37.941385] dracut-initqueue[947]: File "/sbin/parse-kickstart", line 675, in process_kickstart
[ 37.945262] dracut-initqueue[947]: processed_file = preprocessKickstart(ksfile)
[ 37.946152] dracut-initqueue[947]: File "/usr/lib/python2.7/site-packages/pykickstart/parser.py", line 136, in preprocessKickstart
[ 37.947140] dracut-initqueue[947]: rc = _preprocessStateMachine (iter(fh.readlines()))
[ 37.947751] dracut-initqueue[947]: File "/usr/lib/python2.7/site-packages/pykickstart/parser.py", line 81, in _preprocessStateMachine
[ 37.949683] dracut-initqueue[947]: os.write(outF, l)
[ 37.951503] dracut-initqueue[947]: OSError: [Errno 28] No space left on device
[ 38.000148] dracut-initqueue[947]: /lib/anaconda-lib.sh: line 217: /tmp/ks.info: No such file or directory
[ OK ] Started dracut initqueue hook.
[ OK ] Reached target Remote File Systems (Pre).
[ OK ] Reached target Remote File Systems.
Starting dracut pre-mount hook...
[ OK ] Started dracut pre-mount hook.
[ OK ] Reached target Initrd Root File System.
Starting Reload Configuration from the Real Root...
[ OK ] Started Reload Configuration from the Real Root.
[ OK ] Reached target Initrd File Systems.
Starting dracut mount hook...
[ 39.194205] dracut-mount[2230]: Warning: Can't mount root filesystem
[ 39.301710] dracut-mount[2230]: Warning: /dev/root does not exist
[ 39.343224] dracut-mount[2230]: /lib/dracut-lib.sh: line 1049: echo: write error: No space left on device
Starting Dracut Emergency Shell...
Warning: /dev/root does not exist
Generating "/run/initramfs/rdsosreport.txt"
Entering emergency mode. Exit the shell to continue.
Type "journalctl" to view system logs.
You might want to save "/run/initramfs/rdsosreport.txt" to a USB stick or /boot
after mounting them and attach it to a bug report.
:/#
After several attempts and research, I found an older issue with creating VMs with 1GB of ram or less. It appears this is still a limitation. With some testing, I found 1024MB fails, but 1280MB works fine. This appears to be bare minimum to net install. Your mileage may vary. Might be good to use 1536MB or even more.
# virt-install -n testvm --vcpus 1 --memory 1280 \
--disk path=/var/lib/libvirt/images/testvm.img,size=8,format=raw \
--location=http://192.168.1.177/centos --noreboot \
--noautoconsole -x 'console=ttyS0 ks=http://192.168.1.177/ks.cfg'
Console output:
...
100 432M 100 432M 0 0 122M 0 0:00:03 0:00:03 --:--:-- 122M 0 --:--:-- --:--:-- --:--:-- 0
[ 32.583223] loop: module loaded
[ 34.261656] dracut-initqueue[967]: % Total % Received % Xferd Average Speed Time Time Time Current
[ 34.267978] dracut-initqueue[967]: Dload Upload Total Spent Left Speed
100 1033 100 1033 0 0 67622 0 --:--:-- --:--:-- --:--:-- 73785 0 --:--:-- --:--:-- --:--:-- 0
[ OK ] Started dracut initqueue hook.
...
[ OK ] Reached target Switch Root.
Starting Switch Root...
[ 41.032244] systemd-journald[78]: Received SIGTERM from PID 1 (systemd).
[ 41.875854] SELinux: Class bpf not defined in policy.
[ 41.877189] SELinux: the above unknown classes and permissions will be allowed
[ 41.886986] type=1403 audit(1550976715.194:2): policy loaded auid=4294967295 ses=4294967295
[ 41.905389] systemd[1]: Successfully loaded SELinux policy in 466.129ms.
[ 42.122265] systemd[1]: Relabelled /dev, /run and /sys/fs/cgroup in 69.149ms.
Welcome to CentOS Linux 7 (Core)!
...
The process continues on to do a successful KickStart installation. If you see similar failures, it might be a worth a try to bump up VM memory. You can always adjust VM down to the desired size (in my case 512MB) after installation.
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