[libvirt-users] Libvirt guest can't boot up when use ceph as storage backend with Selinux enabled
Shanzhi Yu
shyu at redhat.com
Thu Jan 8 08:19:06 UTC 2015
Hi there,
I met one problem that guest fail to boot up when Selinux is enabled with guest storage
based on ceph. However, I can boot the guest with qemu directly. I also can boot it up
with Selinux disabled. Not sure it is a libvirt bug or wrong use case.
1. Enable Selinux
# getenforce && iptables -L
Enforcing
Chain INPUT (policy ACCEPT)
target prot opt source destination
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
2. Define a guest with source file based on ceph
# virsh define /dev/stdin <<EOF
<domain type='kvm' id='13'>
<name>ceph</name>
<memory unit='KiB'>4048896</memory>
<currentMemory unit='KiB'>4048576</currentMemory>
<vcpu placement='static'>4</vcpu>
<resource>
<partition>/machine</partition>
</resource>
<os>
<type arch='x86_64' machine='pc-i440fx-rhel7.1.0'>hvm</type>
<boot dev='hd'/>
</os>
<features>
</features>
<devices>
<emulator>/usr/libexec/qemu-kvm</emulator>
<disk type='network' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<auth username='libvirt'>
<secret type='ceph' usage='client.libvirt secret'/>
</auth>
<source protocol='rbd' name='libvirt-pool/rhel7-rbd.img'>
<host name='10.66.xxx.xx' port='6789'/>
</source>
<backingStore/>
<target dev='vda' bus='virtio'/>
<alias name='virtio-disk0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
</disk>
</devices>
</domain>
EOF
Domain ceph defined from /dev/stdin
3. Try to start the guest by virsh
# virsh start ceph
error: Failed to start domain ceph
error: internal error: process exited while connecting to monitor:
What I can see from libvirtd log is below:
2015-01-08 08:07:32.376+0000: 22552: warning : qemuDomainObjTaint:1890 : Domain id=19 name='ceph' uuid=e4412366-1f16-4c54-b121-dfb565672427 is tainted: high-privileges
Detaching after fork from child process 23015.
2015-01-08 08:07:32.684+0000: 22552: error : qemuMonitorOpenUnix:309 : failed to connect to monitor socket: No such process
2015-01-08 08:07:32.684+0000: 22552: error : qemuProcessWaitForMonitor:2207 : internal error: process exited while connecting to monitor:
2015-01-08 08:07:32.684+0000: 22552: error : virDBusCall:1542 : error from service: TerminateMachine: No such file or directory
4. Start it by qemu cmd
# cat /usr/local/var/log/libvirt/qemu/ceph.log
2015-01-08 08:08:12.179+0000: starting up
LC_ALL=C PATH=/root/perl5/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin HOME=/root USER=root LOGNAME=root QEMU_AUDIO_DRV=none /usr/libexec/qemu-kvm -name ceph -S -machine pc-i440fx-rhel7.1.0,accel=kvm,usb=off -m 3954 -realtime mlock=off -smp 4,sockets=4,cores=1,threads=1 -uuid e4412366-1f16-4c54-b121-dfb565672427 -nographic -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/usr/local/var/lib/libvirt/qemu/ceph.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -no-acpi -boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=rbd:libvirt-pool/rhel7-rbd.img:id=libvirt:key=AQAQLq5UwO8PMRAA5qftTrdfzXnFZdnunN1WeQ==:auth_supported=cephx\;none:mon_host=10.66.106.92\:6789,if=none,id=drive-virtio-disk0,format=raw,cache=none -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x2 -msg timestamp=on
Domain id=20 is tainted: high-privileges
2015-01-08 08:08:12.473+0000: shutting down
# /usr/libexec/qemu-kvm -name ceph -S -machine pc-i440fx-rhel7.1.0,accel=kvm,usb=off -m 3954 -realtime mlock=off -smp 4,sockets=4,cores=1,threads=1 -uuid 319cf458-8740-4d83-9317-e2d52025aa9e -nographic -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/usr/local/var/lib/libvirt/qemu/ceph.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -no-acpi -boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=rbd:libvirt-pool/rhel7-rbd.img:id=libvirt:key=AQAQLq5UwO8PMRAA5qftTrdfzXnFZdnunN1WeQ==:auth_supported=cephx\;none:mon_host=10.66.106.92,if=none,id=drive-virtio-disk0,format=raw,cache=none
# ps aux|grep qemu
root 23075 2.5 0.2 5114492 16352 pts/5 Sl+ 16:09 0:00 /usr/libexec/qemu-kvm -name ceph -S -machine pc-i440fx-rhel7.1.0,accel=kvm,usb=off -m 3954 -realtime mlock=off -smp 4,sockets=4,cores=1,threads=1 -uuid 319cf458-8740-4d83-9317-e2d52025aa9e -nographic -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/usr/local/var/lib/libvirt/qemu/ceph.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -no-acpi -boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=rbd:libvirt-pool/rhel7-rbd.img:id=libvirt:key=AQAQLq5UwO8PMRAA5qftTrdfzXnFZdnunN1WeQ==:auth_supported=cephx;none:mon_host=10.66.106.92,if=none,id=drive-virtio-disk0,format=raw,cache=none
5. Disable Selinux, start guest by virsh will succeed
# setenforce 0 && virsh start ceph
Domain ceph started
# virsh list
Id Name State
----------------------------------------------------
21 ceph running
# virsh dumpxml ceph|grep disk -A 10
..
<disk type='network' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<auth username='libvirt'>
<secret type='ceph' usage='client.libvirt secret'/>
</auth>
<source protocol='rbd' name='libvirt-pool/rhel7-rbd.img'>
<host name='10.66.xxx.xx' port='6789'/>
</source>
<backingStore/>
<target dev='vda' bus='virtio'/>
<alias name='virtio-disk0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
</disk>
..
I use latest libvirt build from git and
# rpm -q librbd1 librados2 qemu-kvm-rhev
librbd1-0.87-0.el7.x86_64
librados2-0.87-0.el7.x86_64
qemu-kvm-rhev-2.1.2-17.el7.x86_64
--
Regards
shyu
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