# rpm -qa | grep qemu
qemu-img-ev-2.9.0-16.el7_4.8.1.x86_64
qemu-kvm-ev-2.9.0-16.el7_4.8.1.x86_64
ipxe-roms-qemu-20170123-1.git4e85b27.el7_4.1.noarch
libvirt-daemon-driver-qemu-3.2.0-14.el7_4.3.x86_64
qemu-kvm-common-ev-2.9.0-16.el7_4.8.1.x86_64
qemu.conf:
stdio_handler = "file"
libvirtd runs as root with '/usr/sbin/libvirtd --listen'
we run openstack, it creates an instance like this:
2017-11-13 15:17:14.143+0000: starting up libvirt version: 3.2.0, package: 14.el7_4.3 (Unknown, 2017-09-05-02:55:29, x86-ol7-builder
-02.us.oracle.com), qemu version: 2.9.0(qemu-kvm-ev-2.9.0-16.el7_4.8.1), hostname: compute6
LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin HOME=/root QEMU_AUDIO_DRV=none /usr/libexec/qemu-kvm -name guest=instance-00000016,debug-threads=on -S -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-1-instance-00000016/master-key.aes -machine pc-i440fx-rhel7.4.0,accel=kvm,usb=off,dump-guest-core=off -cpu Haswell-noTSX,vme=on,ss=on,f16c=on,rdrand=on,hypervisor=on,arat=on,tsc_adjust=on,xsaveopt=on,abm=on,invpcid=off -m 64 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid 48ea957f-6fbc-4b43-83c8-8c5e83a2ffdf -smbios 'type=1,manufacturer=OpenStack Foundation,product=OpenStack Nova,version=13.0.0,serial=de115ee2-a86f-432d-96fe-bec91b0a5748,uuid=48ea957f-6fbc-4b43-83c8-8c5e83a2ffdf,family=Virtual Machine' -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-1-instance-00000016/monitor.sock,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet -no-shutdown -boot
strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/var/lib/nova/instances/48ea957f-6fbc-4b43-83c8-8c5e83a2ffdf/disk,format=qcow2,if=none,id=drive-virtio-disk0,cache=none -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -netdev tap,fd=26,id=hostnet0,vhost=on,vhostfd=27 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=fa:16:3e:bf:f5:40,bus=pci.0,addr=0x3 -chardev pty,id=charserial0,logfile=/var/lib/nova/instances/48ea957f-6fbc-4b43-83c8-8c5e83
a2ffdf/console.log,logappend=off -device isa-serial,chardev=charserial0,id=serial0 -device usb-tablet,id=input0,bus=usb.0,port=1 -vnc 0.0.0.0:1 -k en-us -device cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 -msg
timestamp=on
With older qemu like 2.5 or 2.6 console log belongs to qemu:qemu and the process starts successfully.
With 2.9 it fails and console.log is left root:root :
2017-11-13 15:17:14.173+0000: 26010: debug : qemuProcessHook:2738 : Hook complete ret=0
2017-11-13 15:17:14.173+0000: 26010: debug : virExec:699 : Done hook 0
2017-11-13 15:17:14.173+0000: 26010: debug : virExec:736 : Setting child uid:gid to 42427:42427 with caps 0
2017-11-13 15:17:14.173+0000: 26010: debug : virCommandHandshakeChild:435 : Notifying parent for handshake start on 29
2017-11-13 15:17:14.173+0000: 26010: debug : virCommandHandshakeChild:443 : Waiting on parent for handshake complete on 30
2017-11-13 15:17:14.192+0000: 26010: debug : virFileClose:110 : Closed fd 29
2017-11-13 15:17:14.192+0000: 26010: debug : virFileClose:110 : Closed fd 30
2017-11-13 15:17:14.192+0000: 26010: debug : virCommandHandshakeChild:463 : Handshake with parent is done
2017-11-13T15:17:14.232713Z qemu-kvm: -chardev pty,id=charserial0,logfile=/var/lib/nova/instances/48ea957f-6fbc-4b43-83c8-8c5e83a2ffdf/console.log,logappend=off: Unable to open logfile /var/lib/nova/instances/48ea957f-6fbc-4b43-83c8-8c5e83a2ffdf/console.log: Permission denied
2017-11-13 15:17:14.321+0000: shutting down, reason=failed
These might be helpful or related:
- https:/
- https:/