First time xen install - Xen DomU runs, but can't find "/dev/root" - virt - Fedora mailing-lists

16 Oct 2013


      I'm trying to get started with Xen and thought I'd do a simple install 
Fedora 18 as a DomU under a Fedora 18 Dom0. Unfortunately this is not 
working for me.
It appears to boot the kernel fine, but then complains that it can't 
find "/dev/root". I presume that this would be a specific root image for 
the Fedora installer?
The logs indicate that the kernel command line is empty. Apparently 
there should be something in there (maybe "root=/dev/xvda") but I am not 
sure how to achieve this. I would have expected virt-install to do this 
for me, though.
Can someone please let me know what I am doing wrong? (details of what I 
am trying are below).
Also, I had to manually start "xend" to get this far. Is this normal? It 
didn't appear in the services in /etc/rc.d/init.d
Thank you
I created a 20GB logical volume /dev/fedora_dhcp1/xen1
I mounted the Fedora 18 installation ISO into /mnt/install (-t iso9660 
-o loop,ro)
I created a bridge "brctl addbr br0" (I haven't added any interfaces to 
it yet, I plan to sort out the network after getting virtualisation working)
I created the Xen DomU instance using the following command...
[root@dhcp1 ~]# virt-install --paravirt --name xen1 --ram 256 --vcpus 1 
-f /dev/fedora_dhcp1/xen1 --network bridge=br0 --location /mnt/install 
--graphics none
Starting install...
Retrieving file .treeinfo... | 2.4 kB  00:00:00 !!!
Retrieving file vmlinuz-PAE... | 9.3 MB  00:00:00 !!!
Retrieving file initrd-PAE.img... |  52 MB  00:00:00 !!!
Creating domain... |    0 B  00:00:01
Connected to domain xen1
Escape character is ^] [    0.000000] Reserving virtual address space 
above 0xf5800000
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Linux version 3.6.10-4.fc18.i686.PAE (mockbuild@) (gcc 
version 4.7.2 20121109 (Red Hat 4.7.2-8) (GCC) ) #1 SMP Tue Dec 11 
18:15:08 UTC 2012
[    0.000000] ACPI in unprivileged domain disabled
[    0.000000] e820: BIOS-provided physical RAM map:
[    0.000000] Xen: [mem 0x0000000000000000-0x000000000009ffff] usable
[    0.000000] Xen: [mem 0x00000000000a0000-0x00000000000fffff] reserved
[    0.000000] Xen: [mem 0x0000000000100000-0x00000000107fffff] usable
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] DMI not present or invalid.
[    0.000000] e820: last_pfn = 0x10800 max_arch_pfn = 0x1000000
[    0.000000] init_memory_mapping: [mem 0x00000000-0x107fffff]
[    0.000000] RAMDISK: [mem 0x0102f000-0x02a6cfff]
[    0.000000] 0MB HIGHMEM available.
[    0.000000] 264MB LOWMEM available.
[    0.000000]   mapped low ram: 0 - 10800000
[    0.000000]   low ram: 0 - 10800000
[    0.000000] Zone ranges:
[    0.000000]   DMA      [mem 0x00010000-0x00ffffff]
[    0.000000]   Normal   [mem 0x01000000-0x107fffff]
[    0.000000]   HighMem  empty
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x00010000-0x0009ffff]
[    0.000000]   node   0: [mem 0x00100000-0x107fffff]
[    0.000000] Using APIC driver default
[    0.000000] SFI: Simple Firmware Interface v0.81 
http://simplefirmware.org
[    0.000000] smpboot: Allowing 1 CPUs, 0 hotplug CPUs
[    0.000000] Local APIC disabled by BIOS -- you can enable it with 
"lapic"
[    0.000000] APIC: disable apic facility
[    0.000000] APIC: switched to apic NOOP
[    0.000000] PM: Registered nosave memory: 00000000000a0000 - 
0000000000100000
[    0.000000] e820: [mem 0x10800000-0xffffffff] available for PCI devices
[    0.000000] Booting paravirtualized kernel on Xen
[    0.000000] Xen version: 4.2.2 (preserve-AD)
[    0.000000] setup_percpu: NR_CPUS:32 nr_cpumask_bits:32 nr_cpu_ids:1 
nr_node_ids:1
[    0.000000] PERCPU: Embedded 14 pages/cpu @cfdde000 s34880 r0 d22464 
u57344
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  
Total pages: 66944
[    0.000000] Kernel command line:
[    0.000000] PID hash table entries: 2048 (order: 1, 8192 bytes)
[    0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 
bytes)
[    0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 
bytes)
[    0.000000] __ex_table already sorted, skipping sort
[    0.000000] Initializing CPU#0
[    0.000000] allocated 540544 bytes of page_cgroup
[    0.000000] please try 'cgroup_disable=memory' option if you don't 
want memory cgroups
[    0.000000] Initializing HighMem for node 0 (00000000:00000000)
[    0.000000] Memory: 220784k/270336k available (5639k kernel code, 
49104k reserved, 2745k data, 656k init, 0k highmem)
[    0.000000] virtual kernel memory layout:
[    0.000000]     fixmap  : 0xf5296000 - 0xf57ff000   (5540 kB)
[    0.000000]     pkmap   : 0xf4e00000 - 0xf5000000   (2048 kB)
[    0.000000]     vmalloc : 0xd1000000 - 0xf4dfe000   ( 573 MB)
[    0.000000]     lowmem  : 0xc0000000 - 0xd0800000   ( 264 MB)
[    0.000000]       .init : 0xc0c31000 - 0xc0cd5000   ( 656 kB)
[    0.000000]       .data : 0xc0981f81 - 0xc0c30640   (2745 kB)
[    0.000000]       .text : 0xc0400000 - 0xc0981f81   (5639 kB)
[    0.000000] SLUB: Genslabs=15, HWalign=128, Order=0-3, MinObjects=0, 
CPUs=1, Nodes=1
[    0.000000] Hierarchical RCU implementation.
[    0.000000]  RCU restricting CPUs from NR_CPUS=32 to nr_cpu_ids=1.
[    0.000000] NR_IRQS:2304 nr_irqs:256 16
[    0.000000] Console: colour dummy device 80x25
[    0.000000] console [tty0] enabled
[    0.000000] console [hvc0] enabled
[    0.000000] installing Xen timer for CPU 0
[    0.000000] tsc: Detected 3192.140 MHz processor
[    0.000999] Calibrating delay loop (skipped), value calculated using 
timer frequency.. 6384.28 BogoMIPS (lpj=3192140)
[    0.000999] pid_max: default: 32768 minimum: 301
[    0.000999] Security Framework initialized
[    0.000999] SELinux:  Initializing.
[    0.000999] Mount-cache hash table entries: 512
[    0.000999] Initializing cgroup subsys cpuacct
[    0.000999] Initializing cgroup subsys memory
[    0.000999] Initializing cgroup subsys devices
[    0.000999] Initializing cgroup subsys freezer
[    0.000999] Initializing cgroup subsys net_cls
[    0.000999] Initializing cgroup subsys blkio
[    0.000999] Initializing cgroup subsys perf_event
[    0.000999] CPU: Physical Processor ID: 0
[    0.000999] CPU: Processor Core ID: 0
[    0.000999] Last level iTLB entries: 4KB 64, 2MB 64, 4MB 64
[    0.000999] Last level dTLB entries: 4KB 64, 2MB 0, 4MB 64
[    0.000999] tlb_flushall_shift is 0x6
[    0.001032] SMP alternatives: switching to UP code
[    0.081199] Freeing SMP alternatives: 24k freed
[    0.081250] ftrace: allocating 23058 entries in 46 pages
[    0.090144] Performance Events: unsupported Netburst CPU model 4 no 
PMU driver, software events only.
[    0.091214] NMI watchdog: disabled (cpu0): hardware events not enabled
[    0.091321] Brought up 1 CPUs
[    0.091630] devtmpfs: initialized
[    0.093188] atomic64 test passed for i586+ platform with CX8 and with 
SSE
[    0.093282] Grant tables using version 2 layout.
[    0.093359] Grant table initialized
[    0.111982] RTC time: 165:165:165, date: 165/165/65
[    0.112096] NET: Registered protocol family 16
[    0.113006] PCI: setting up Xen PCI frontend stub
[    0.114351] bio: create slab <bio-0> at 0
[    0.114467] ACPI: Interpreter disabled.
[    0.114509] xen/balloon: Initialising balloon driver.
[    0.116027] xen-balloon: Initialising balloon driver.
[    0.116153] vgaarb: loaded
[    0.116362] SCSI subsystem initialized
[    0.116594] usbcore: registered new interface driver usbfs
[    0.116620] usbcore: registered new interface driver hub
[    0.117036] usbcore: registered new device driver usb
[    0.117254] PCI: System does not support PCI
[    0.117271] PCI: System does not support PCI
[    0.117461] NetLabel: Initializing
[    0.117473] NetLabel:  domain hash size = 128
[    0.117481] NetLabel:  protocols = UNLABELED CIPSOv4
[    0.117501] NetLabel:  unlabeled traffic allowed by default
[    0.117528] Switching to clocksource xen
[    0.128867] pnp: PnP ACPI: disabled
[    0.131836] NET: Registered protocol family 2
[    0.132040] TCP established hash table entries: 16384 (order: 5, 
131072 bytes)
[    0.132148] TCP bind hash table entries: 16384 (order: 5, 131072 bytes)
[    0.132223] TCP: Hash tables configured (established 16384 bind 16384)
[    0.132256] TCP: reno registered
[    0.132266] UDP hash table entries: 256 (order: 1, 8192 bytes)
[    0.132280] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
[    0.132359] NET: Registered protocol family 1
[    0.132609] Unpacking initramfs...
[    5.400424] Freeing initrd memory: 26872k freed
[    5.420100] platform rtc_cmos: registered platform RTC device (no PNP 
device found)
[    5.420423] apm: BIOS not found.
[    5.420790] Initialise module verification
[    5.420887] audit: initializing netlink socket (disabled)
[    5.420926] type=2000 audit(1381867979.607:1): initialized
[    5.443018] HugeTLB registered 2 MB page size, pre-allocated 0 pages
[    5.445007] VFS: Disk quotas dquot_6.5.2
[    5.445162] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[    5.445893] msgmni has been set to 483
[    5.447183] alg: No test for stdrng (krng)
[    5.447213] NET: Registered protocol family 38
[    5.447231] Key type asymmetric registered
[    5.447245] Asymmetric key parser 'x509' registered
[    5.447349] Block layer SCSI generic (bsg) driver version 0.4 loaded 
(major 252)
[    5.447457] io scheduler noop registered
[    5.447476] io scheduler deadline registered
[    5.447512] io scheduler cfq registered (default)
[    5.447736] pci_hotplug: PCI Hot Plug PCI Core version: 0.5
[    5.447789] pciehp: PCI Express Hot Plug Controller Driver version: 0.4
[    5.447805] acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5
[    5.448701] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[    5.449418] Non-volatile memory driver v1.3
[    5.449436] Linux agpgart interface v0.103
[    5.450770] loop: module loaded
[    5.451003] libphy: Fixed MDIO Bus: probed
[    5.451195] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    5.451245] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    5.451283] uhci_hcd: USB Universal Host Controller Interface driver
[    5.451406] usbcore: registered new interface driver usbserial
[    5.451447] usbcore: registered new interface driver usbserial_generic
[    5.451483] USB Serial support registered for generic
[    5.451500] usbserial: USB Serial Driver core
[    5.451563] i8042: PNP: No PS/2 controller found. Probing ports 
directly.
[    5.452551] mousedev: PS/2 mouse device common for all mice
[    5.512978] rtc_cmos rtc_cmos: rtc core: registered rtc_cmos as rtc0
[    5.513129] rtc_cmos: probe of rtc_cmos failed with error -38
[    5.513270] device-mapper: uevent: version 1.0.3
[    5.513381] device-mapper: ioctl: 4.23.0-ioctl (2012-07-25) 
initialised: dm-devel@redhat.com
[    5.513464] EFI Variables Facility v0.08 2004-May-17
[    5.513641] usbcore: registered new interface driver usbhid
[    5.513652] usbhid: USB HID core driver
[    5.513686] drop_monitor: Initializing network drop monitor service
[    5.513818] ip_tables: (C) 2000-2006 Netfilter Core Team
[    5.513897] TCP: cubic registered
[    5.513907] Initializing XFRM netlink socket
[    5.514097] NET: Registered protocol family 10
[    5.514332] mip6: Mobile IPv6
[    5.514343] NET: Registered protocol family 17
[    5.514370] Using IPI No-Shortcut mode
[    5.514529] Loading module verification certificates
[    5.519112] MODSIGN: Loaded cert 'Fedora kernel signing key: 
de2965de66714570abd7e5852342fe03dd0c1ba7'
[    5.519152] registered taskstats version 1
[    5.519178] XENBUS: Device with no driver: device/vbd/51712
[    5.519189] XENBUS: Device with no driver: device/vif/0
[    5.519272]   Magic number: 1:252:3141
[    5.519319] drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
[    5.519873] Freeing unused kernel memory: 656k freed
[    5.523151] Write protecting the kernel text: 5640k
[    5.524299] Write protecting the kernel read-only data: 2212k
[    5.524315] NX-protecting the kernel data: 4600k
[    5.533912] systemd[1]: systemd 195 running in system mode. (+PAM 
+LIBWRAP +AUDIT +SELINUX +IMA +SYSVINIT +LIBCRYPTSETUP +GCRYPT +ACL +XZ; 
fedora)
[    5.534049] systemd[1]: Running in initial RAM disk.
Welcome to Fedora 18 (Spherical Cow) dracut-024-18.git20130102.fc18 
(Initramfs)!
[    5.534462] systemd[1]: No hostname configured.
[    5.534488] systemd[1]: Set hostname to <localhost>.
[    5.534651] systemd[1]: Initializing machine ID from random generator.
[    5.561666] systemd[1]: Starting Encrypted Volumes.
[  OK  ] Reached target Encrypted Volumes.
[    5.601607] systemd[1]: Reached target Encrypted Volumes.
[    5.601835] systemd[1]: Starting udev Kernel Socket.
[  OK  ] Listening on udev Kernel Socket.
[    5.602206] systemd[1]: Listening on udev Kernel Socket.
[    5.602403] systemd[1]: Starting udev Control Socket.
[  OK  ] Listening on udev Control Socket.
[    5.602748] systemd[1]: Listening on udev Control Socket.
[    5.602819] systemd[1]: Starting Journal Socket.
[  OK  ] Listening on Journal Socket.
[    5.603217] systemd[1]: Listening on Journal Socket.
[    5.603297] systemd[1]: Starting dracut cmdline hook...
          Starting dracut cmdline hook...
[    5.605425] systemd[1]: Started Load Kernel Modules.
[    5.605554] systemd[1]: Starting Journal Service...
          Starting Journal Service...
[  OK  ] Started Journal Service.
[    5.648995] systemd[1]: Started Journal Service.
[    5.651273] systemd[1]: Starting Sockets.
[  OK  ] Reached target Sockets.
[    5.651494] systemd[1]: Reached target Sockets.
[    5.651570] systemd[1]: Starting Swap.
[  OK  ] Reached target Swap.
[    5.651769] systemd[1]: Reached target Swap.
[    5.651850] systemd[1]: Starting Local File Systems.
[  OK  ] Reached target Local File Systems.
[    5.652027] systemd[1]: Reached target Local File Systems.
[    6.009250] BIOS EDD facility v0.16 2004-Jun-25, 0 devices found
[    6.009278] EDD information not available.
[  OK  ] Started dracut cmdline hook.
          Starting Setup Virtual Console...
          Starting dracut pre-udev hook...
[  OK  ] Started Setup Virtual Console.
[  OK  ] Reached target System Initialization.
[    6.726690] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    6.737807] Loading iSCSI transport class v2.0-870.
[    6.754446] iscsi: registered transport (tcp)
[    6.764264] alua: device handler registered
[    6.773860] emc: device handler registered
[    6.783584] hp_sw: device handler registered
[    6.793520] rdac: device handler registered
[    6.805629] Floppy drive(s): fd0 is unknown type 15 (usb?), fd1 is 
unknown type 15 (usb?)
[    6.805674] floppy0: Unable to grab IRQ6 for the floppy driver
[    6.816022] BIOS EDD facility v0.16 2004-Jun-25, 0 devices found
[    6.816054] EDD information not available.
[    6.830877] No iBFT detected.
[    6.840605] md: raid0 personality registered for level 0
[    6.852284] md: raid1 personality registered for level 1
[    6.862087] async_tx: api initialized (async)
[    6.867605] xor: automatically using best checksumming function:
[    6.877077]    pIII_sse  :  1932.000 MB/sec
[    6.905090] raid6: mmxx1     1863 MB/s
[    6.922093] raid6: mmxx2     2136 MB/s
[    6.939094] raid6: sse1x1    1066 MB/s
[    6.956097] raid6: sse1x2    2078 MB/s
[    6.973082] raid6: sse2x1    2164 MB/s
[    6.990076] raid6: sse2x2    3160 MB/s
[    6.990093] raid6: using algorithm sse2x2 (3160 MB/s)
[    6.990109] raid6: using intx1 recovery algorithm
[    7.016396] md: raid6 personality registered for level 6
[    7.016421] md: raid5 personality registered for level 5
[    7.016438] md: raid4 personality registered for level 4
[    7.037861] md: raid10 personality registered for level 10
[    7.048264] md: linear personality registered for level -1
[    7.076403] device-mapper: multipath: version 1.5.0 loaded
[    7.086880] device-mapper: multipath round-robin: version 1.0.0 loaded
[    7.229246] RPC: Registered named UNIX socket transport module.
[    7.229270] RPC: Registered udp transport module.
[    7.229279] RPC: Registered tcp transport module.
[    7.229287] RPC: Registered tcp NFSv4.1 backchannel transport module.
[  OK  ] Started dracut pre-udev hook.
          Starting udev Kernel Device Manager...
[  OK  ] Started udev Kernel Device Manager.
          Starting dracut pre-trigger hook...
[    7.560135] systemd-udevd[225]: starting version 195
[  OK  ] Started dracut pre-trigger hook.
          Starting udev Coldplug all Devices...
[  OK  ] Started udev Coldplug all Devices.
          Starting Show Plymouth Boot Screen...
          Starting dracut initqueue hook...
[    8.228185] Disabling lock debugging due to kernel taint
[    8.230621] Initialising Xen virtual ethernet driver.
[    8.263474] blkfront: xvda: flush diskcache: enabled
[    8.293282]  xvda: unknown partition table
[  OK  ] Started Show Plymouth Boot Screen.
[  OK  ] Reached target Basic System.
dracut-initqueue[278]: Warning: Could not boot.
[  OK  ] Started Show Plymouth Boot Screen.
[  OK  ] Reached target Basic System.
dracut-initqueue[278]: Warning: Could not boot.
dracut-initqueue[278]: Warning: /dev/root does not exist
Entering emergency mode. Exit the shell to continue.
Type "journalctl" to view system logs.
dracut:/#
dracut:/# cat /proc/cmdline
dracut:/#
Entering emergency mode. Exit the shell to continue.
Type "journalctl" to view system logs.
dracut:/#