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@shiyasu(Shinobu Yasuda)
in

IBM Cloud: btrfsをrootファイルシステムに含むサーバー（OpenSUSE)のVSI for VPCへの移行メモ

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1. はじめに

Rackwareは現在、SUSE + btrfsの移行をサポートしていないので、virt-v2vで移行できるかを確かめてみた。
ただ、SUSEそのものは持っていないので、OpenSUSEをVMWare上にインストールして検証している。手順のほとんどは、これと同じなので、何を実施したかの概要しか説明していない。

2. VMware環境上のOpenSuse環境の確認

OpenSuse環境のインストール手順は省略。btrfsがroot file systemとして利用されている。

バージョン情報
syasuda@opensuse-syasuda1:~> cat /etc/os-release
NAME="openSUSE Leap"
VERSION="16.0"
ID="opensuse-leap"
ID_LIKE="suse opensuse"
VERSION_ID="16.0"
PRETTY_NAME="openSUSE Leap 16.0"
ANSI_COLOR="0;32"
CPE_NAME="cpe:/o:opensuse:leap:16.0"
BUG_REPORT_URL="https://bugs.opensuse.org"
HOME_URL="https://www.opensuse.org/"
DOCUMENTATION_URL="https://en.opensuse.org/Portal:Leap"
LOGO="distributor-logo-Leap"
DISK情報
syasuda@opensuse-syasuda1:~> df -hT
Filesystem     Type      Size  Used Avail Use% Mounted on
/dev/sda3      btrfs      24G  810M   23G   4% /
devtmpfs       devtmpfs  4.0M     0  4.0M   0% /dev
tmpfs          tmpfs     985M     0  985M   0% /dev/shm
tmpfs          tmpfs     394M  744K  394M   1% /run
tmpfs          tmpfs     1.0M     0  1.0M   0% /run/credentials/systemd-journald.service
/dev/sda3      btrfs      24G  810M   23G   4% /.snapshots
/dev/sda3      btrfs      24G  810M   23G   4% /boot/grub2/i386-pc
/dev/sda3      btrfs      24G  810M   23G   4% /boot/grub2/x86_64-efi
/dev/sda3      btrfs      24G  810M   23G   4% /home
/dev/sda3      btrfs      24G  810M   23G   4% /opt
/dev/sda3      btrfs      24G  810M   23G   4% /srv
/dev/sda3      btrfs      24G  810M   23G   4% /root
/dev/sda3      btrfs      24G  810M   23G   4% /tmp
/dev/sda3      btrfs      24G  810M   23G   4% /usr/local
/dev/sda3      btrfs      24G  810M   23G   4% /var
/dev/sda2      vfat      512M  4.0M  508M   1% /boot/efi
tmpfs          tmpfs     1.0M     0  1.0M   0% /run/credentials/getty@tty1.service
tmpfs          tmpfs     197M  4.0K  197M   1% /run/user/1000
tmpfs          tmpfs     1.0M     0  1.0M   0% /run/credentials/serial-getty@ttyS0.service

syasuda@opensuse-syasuda1:~> lsblk -pf
NAME        FSTYPE FSVER LABEL UUID                                 FSAVAIL FSUSE% MOUNTPOINTS
/dev/sda
├─/dev/sda1
├─/dev/sda2 vfat   FAT16 EFI   BE2D-B7C2                             507.8M     1% /boot/efi
└─/dev/sda3 btrfs        ROOT  41b87736-08cc-6bd0-85de-d844cd161676   22.2G     3% /var
                                                                                   /usr/local
                                                                                   /tmp
                                                                                   /root
                                                                                   /srv
                                                                                   /opt
                                                                                   /home
                                                                                   /boot/grub2/x86_64-efi
                                                                                   /boot/grub2/i386-pc
                                                                                   /.snapshots
                                                                                   /
/dev/sr0
NW情報
syasuda@opensuse-syasuda1:~> nmcli con show
NAME    UUID                                  TYPE      DEVICE
ens192  6a12b10a-ddf4-49a9-83fd-f797a6e8cc0b  ethernet  ens192
lo      2ee90eea-b0f0-4e4f-b19e-8d6effbc78c0  loopback  lo

syasuda@opensuse-syasuda1:~> nmcli dev show
GENERAL.DEVICE:                         ens192
GENERAL.TYPE:                           ethernet
GENERAL.HWADDR:                         00:50:56:9D:30:42
GENERAL.MTU:                            1500
GENERAL.STATE:                          100 (connected)
GENERAL.CONNECTION:                     ens192
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/2
WIRED-PROPERTIES.CARRIER:               on
IP4.ADDRESS[1]:                         10.153.35.253/27
IP4.GATEWAY:                            10.153.35.225
IP4.ROUTE[1]:                           dst = 0.0.0.0/0, nh = 10.153.35.225, mt = 20100
IP4.ROUTE[2]:                           dst = 10.153.35.224/27, nh = 0.0.0.0, mt = 100
IP4.DNS[1]:                             10.0.80.11
IP4.DNS[2]:                             10.0.80.12
IP6.ADDRESS[1]:                         fe80::250:56ff:fe9d:3042/64
IP6.GATEWAY:                            --
IP6.ROUTE[1]:                           dst = fe80::/64, nh = ::, mt = 256

GENERAL.DEVICE:                         lo
GENERAL.TYPE:                           loopback
GENERAL.HWADDR:                         00:00:00:00:00:00
GENERAL.MTU:                            65536
GENERAL.STATE:                          100 (connected (externally))
GENERAL.CONNECTION:                     lo
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/1
IP4.ADDRESS[1]:                         127.0.0.1/8
IP4.GATEWAY:                            --
IP6.ADDRESS[1]:                         ::1/128
IP6.GATEWAY:                            --

syasuda@opensuse-syasuda1:~> ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute
       valid_lft forever preferred_lft forever
2: ens192: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:50:56:9d:30:42 brd ff:ff:ff:ff:ff:ff
    altname enp11s0
    altname enx0050569d3042
    inet 10.153.35.253/27 brd 10.153.35.255 scope global noprefixroute ens192
       valid_lft forever preferred_lft forever
    inet6 fe80::250:56ff:fe9d:3042/64 scope link proto kernel_ll
       valid_lft forever preferred_lft forever
       
syasuda@opensuse-syasuda1:~> ip r
default via 10.153.35.225 dev ens192 proto static metric 20100
10.153.35.224/27 dev ens192 proto kernel scope link src 10.153.35.253 metric 100
cloud-initはインストールされていない
opensuse-syasuda1:~ # rpm -qa | grep cloud-init
opensuse-syasuda1:~ # ls -l /var/lib/cloud
ls: cannot access '/var/lib/cloud': No such file or directory
opensuse-syasuda1:~ # ls -l /etc/lib/cloud
ls: cannot access '/etc/lib/cloud': No such file or directory
opensuse-syasuda1:~ # ls -l /etc/cloud
ls: cannot access '/etc/cloud': No such file or directory

3. 変換の実施

  1. Converter VSIのセットアップなど詳細な手順はこれを参照。

  2. Gen1ストレージ付きの暫定VSI for VPCをCentOS10で作成。Auto-DeleteはDisabledにする。その後、この暫定VSIを削除して、Boot DISKを得る。

  3. Converter VSIに上記Boot DISKをアタッチ。/dev/vdeが割り当てられたことを以下で確認。

    Converer VSI上でのディスク確認
    root@syasuda-converter-fedora:~# lsblk -pf
NAME        FSTYPE  FSVER            LABEL      UUID                                 FSAVAIL FSUSE% MOUNTPOINTS
/dev/vda
├─/dev/vda1
├─/dev/vda2 vfat    FAT16            EFI-SYSTEM 7B77-95E7
├─/dev/vda3 ext4    1.0              boot       99d3b227-8df4-44aa-9e03-c7f3dbc6b118     45M    81% /boot
└─/dev/vda4 xfs                      root       d0463b38-8446-453c-83bf-8d7a8a6f8b60     89G    10% /var
                                                                                                    /sysroot/ostree/deploy/fedora-coreos/var
                                                                                                    /sysroot
                                                                                                    /etc
/dev/vdb    iso9660 Joliet Extension cidata     2026-10-22-01-34-42-00
/dev/vdc    swap    1                SWAP-xvdb1 238abd1c-dd21-4e1a-b01a-6de74299c8fa
/dev/vdd    ext4    1.0                         12e543f7-69a7-457c-bf6d-b447ea2b1842
/dev/vde
├─/dev/vde1
├─/dev/vde2 vfat    FAT16            EFI        3E93-A4FF
└─/dev/vde3 xfs                      ROOT       4a4e2c6d-cef5-4496-8fc5-150e0d5eb189

  4. Converter VSI上で、以下のスクリプトを作成して実行。

    createlink_opensuse.sh
    VM_NAME=syasuda-opensuse16
TARGET_DEV=/dev/vde

SYMLINK="/tmp/${VM_NAME}-sda"
ln -fs "${TARGET_DEV}" "${SYMLINK}"
ls -l "${SYMLINK}"

    root@syasuda-converter-fedora:~# bash createlink_opensuse.sh
lrwxrwxrwx. 1 root root 8 Oct 22 10:40 /tmp/syasuda-opensuse16-sda -> /dev/vde

  5. VMware環境上のVMの正常停止

  6. Converter VSIで変換を実施。指定するスクリプトは以下を利用。

    root@syasuda-converter-fedora:~# virt-v2v -ic 'vpx://vsphere.local%5CAdministrator@vcsosv-vc.acs.japan.local/IBMCloud/vcs-osv-cluster/host-km000.acs.japan.local?no_verify=1' -it vddk -io vddk-libdir=/opt/vmware-vix-disklib-distrib/ -io vddk-thumbprint=D2:AE:CF:26:22:8C:89:13:A4:67:89:19:7F:64:1C:97:35:C8:11:54  "syasuda-opensuse16" -ip vcenter_passwd.txt -o disk -os /tmp --run nwscript-update-suse.sh
[   0.0] Setting up the source: -i libvirt -ic vpx://vsphere.local%5CAdministrator@vcsosv-vc.acs.japan.local/IBMCloud/vcs-osv-cluster/host-km000.acs.japan.local?no_verify=1 -it vddk syasuda-opensuse16
[   1.6] Opening the source
[  11.0] Checking filesystem integrity before conversion
[  25.8] Detecting if this guest uses BIOS or UEFI to boot
[  26.2] Inspecting the source
[  29.0] Detecting the boot device
[  29.2] Checking for sufficient free disk space in the guest
[  29.2] Converting openSUSE Leap 16.0 (opensuse16.0) to run on KVM
virt-v2v: warning: could not determine a way to update the configuration of
Grub2
virt-v2v: The QEMU Guest Agent will be installed for this guest at first
boot.
virt-v2v: This guest has virtio drivers installed.
[  37.8] Setting a random seed
[  37.8] Running: nwscript-update-suse.sh
[  38.8] SELinux relabelling
[  40.8] Mapping filesystem data to avoid copying unused and blank areas
[  46.1] Checking filesystem integrity after conversion
[  47.4] Closing the overlay
[  47.4] Assigning disks to buses
[  47.4] Checking if the guest needs BIOS or UEFI to boot
[  47.4] Setting up the destination: -o disk -os /tmp
[  49.3] Copying disk 1/1
█ 100% [****************************************]
[ 574.0] Creating output metadata
virt-v2v: warning: get_osinfo_id: unknown guest operating system:
opensuse16.0
[ 574.0] Finishing off
    nwscript-update-suse.sh
    #!/bin/bash
set -e

############################################
# SLES/openSUSE (update kernel parameter)
############################################
if grep -qiE '^(ID=sles|ID="sles"|ID=opensuse-leap|ID="opensuse-leap")' /etc/os-release; then

  GRUB_CFG="/etc/default/grub"

  CMDLINE=$(grep '^GRUB_CMDLINE_LINUX=' "$GRUB_CFG" | cut -d'"' -f2)
  CMDLINE_DEFAULT=$(grep '^GRUB_CMDLINE_LINUX_DEFAULT=' "$GRUB_CFG" | cut -d'"' -f2)

  [[ "$CMDLINE_DEFAULT" != *net.ifnames=0* && "$CMDLINE" != *net.ifnames=0* ]] && CMDLINE="$CMDLINE net.ifnames=0"
  [[ "$CMDLINE_DEFAULT" != *biosdevname=0* && "$CMDLINE" != *biosdevname=0* ]] && CMDLINE="$CMDLINE biosdevname=0"
  [[ "$CMDLINE_DEFAULT" != *vga=normal* && "$CMDLINE" != *vga=normal* ]] && CMDLINE="$CMDLINE vga=normal"
  [[ "$CMDLINE_DEFAULT" != *console=tty1* && "$CMDLINE" != *console=tty1* ]] && CMDLINE="$CMDLINE console=tty1"
  [[ "$CMDLINE_DEFAULT" != *console=ttyS0* && "$CMDLINE" != *console=ttyS0* ]] && CMDLINE="$CMDLINE console=ttyS0"

  sed -i \
    "s|^GRUB_CMDLINE_LINUX=.*|GRUB_CMDLINE_LINUX=\"$CMDLINE\"|" \
    "$GRUB_CFG"

  grub2-mkconfig -o /boot/grub2/grub.cfg 2>/dev/null || true

fi

############################################
# Network Settings
############################################

rm -f /etc/NetworkManager/system-connections/* || true
rm -f /etc/sysconfig/network/ifcfg-* || true
rm -f /etc/sysconfig/network/routes || true
rm -f /etc/udev/rules.d/70-persistent-net.rules || true

############################################
# keyfile for NetworkManager
############################################

if grep -qiE '^(ID=sles|ID="sles"|ID=opensuse-leap|ID="opensuse-leap")' /etc/os-release; then

cat <<EOF >/etc/NetworkManager/system-connections/dhcp-any.nmconnection
[connection]
id=dhcp-any
type=ethernet
autoconnect=true

[ipv4]
method=auto

[ipv6]
method=disabled
EOF

chmod 600 /etc/NetworkManager/system-connections/dhcp-any.nmconnection

fi

############################################
# ifcfg for wicked or NetworkManager
############################################

if [ -d /etc/sysconfig/network ]; then

    IFCFG_FILE="/etc/sysconfig/network/ifcfg-eth0"

    cat > "$IFCFG_FILE" <<EOF
BOOTPROTO='dhcp'
DEVICE='eth0'
STARTMODE='auto'
EOF

    chmod 600 "$IFCFG_FILE"

fi

  7. DISKのフラッシュ

    root@syasuda-converter-fedora:~# blockdev --flushbufs /dev/vde

  8. Converter VSIからディスクをdetach

  9. 新規にこのディスクをBoot DiskとしてVSI for VPCをプロビジョニング

4. 起動後の確認

バージョン情報
opensuse-syasuda1:~ # cat /etc/os-release
NAME="openSUSE Leap"
VERSION="16.0"
ID="opensuse-leap"
ID_LIKE="suse opensuse"
VERSION_ID="16.0"
PRETTY_NAME="openSUSE Leap 16.0"
ANSI_COLOR="0;32"
CPE_NAME="cpe:/o:opensuse:leap:16.0"
BUG_REPORT_URL="https://bugs.opensuse.org"
HOME_URL="https://www.opensuse.org/"
DOCUMENTATION_URL="https://en.opensuse.org/Portal:Leap"
LOGO="distributor-logo-Leap"
DISK情報
opensuse-syasuda1:~ # df -hT
Filesystem     Type      Size  Used Avail Use% Mounted on
/dev/vda3      btrfs      24G 1007M   23G   5% /
devtmpfs       devtmpfs  4.0M     0  4.0M   0% /dev
tmpfs          tmpfs     3.9G     0  3.9G   0% /dev/shm
tmpfs          tmpfs     1.6G  608K  1.6G   1% /run
tmpfs          tmpfs     1.0M     0  1.0M   0% /run/credentials/systemd-journald.service
/dev/vda3      btrfs      24G 1007M   23G   5% /.snapshots
/dev/vda3      btrfs      24G 1007M   23G   5% /boot/grub2/x86_64-efi
/dev/vda3      btrfs      24G 1007M   23G   5% /home
/dev/vda3      btrfs      24G 1007M   23G   5% /opt
/dev/vda3      btrfs      24G 1007M   23G   5% /boot/grub2/i386-pc
/dev/vda3      btrfs      24G 1007M   23G   5% /root
/dev/vda3      btrfs      24G 1007M   23G   5% /srv
/dev/vda3      btrfs      24G 1007M   23G   5% /tmp
/dev/vda3      btrfs      24G 1007M   23G   5% /usr/local
/dev/vda3      btrfs      24G 1007M   23G   5% /var
/dev/vda2      vfat      512M  4.0M  508M   1% /boot/efi
tmpfs          tmpfs     1.0M     0  1.0M   0% /run/credentials/getty@tty1.service
tmpfs          tmpfs     1.0M     0  1.0M   0% /run/credentials/serial-getty@ttyS0.service
tmpfs          tmpfs     794M  4.0K  794M   1% /run/user/1000

opensuse-syasuda1:~ # lsblk -pf
NAME        FSTYPE  FSVER            LABEL      UUID                                 FSAVAIL FSUSE% MOUNTPOINTS
/dev/vda
├─/dev/vda1
├─/dev/vda2 vfat    FAT16            EFI        BE2D-B7C2                             507.8M     1% /boot/efi
└─/dev/vda3 btrfs                    ROOT       41b87736-08cc-6bd0-85de-d844cd161676   22.1G     4% /var
                                                                                                    /usr/local
                                                                                                    /tmp
                                                                                                    /srv
                                                                                                    /root
                                                                                                    /boot/grub2/i386-pc
                                                                                                    /opt
                                                                                                    /home
                                                                                                    /boot/grub2/x86_64-efi
                                                                                                    /.snapshots
                                                                                                    /
/dev/vdb    iso9660 Joliet Extension cidata     2026-10-22-02-40-26-00
/dev/vdc    swap    1                SWAP-xvdb1 3b1abd86-7fc2-4401-ac3c-9b47ed928430
NW情報
opensuse-syasuda1:~ # nmcli con
NAME      UUID                                  TYPE      DEVICE
dhcp-any  27b549ef-0d09-30fe-80ee-63d2c2727120  ethernet  eth0
lo        e4135082-fc13-4b35-8734-f3d2d3ca2570  loopback  lo
opensuse-syasuda1:~ # nmcli dev show
GENERAL.DEVICE:                         eth0
GENERAL.TYPE:                           ethernet
GENERAL.HWADDR:                         02:00:07:DE:54:A8
GENERAL.MTU:                            1500
GENERAL.STATE:                          100 (connected)
GENERAL.CONNECTION:                     dhcp-any
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/2
WIRED-PROPERTIES.CARRIER:               on
IP4.ADDRESS[1]:                         10.239.0.20/24
IP4.GATEWAY:                            10.239.0.1
IP4.ROUTE[1]:                           dst = 10.239.0.0/24, nh = 0.0.0.0, mt = 100
IP4.ROUTE[2]:                           dst = 0.0.0.0/0, nh = 10.239.0.1, mt = 100
IP4.DNS[1]:                             161.26.0.7
IP4.DNS[2]:                             161.26.0.8
IP6.GATEWAY:                            --

GENERAL.DEVICE:                         lo
GENERAL.TYPE:                           loopback
GENERAL.HWADDR:                         00:00:00:00:00:00
GENERAL.MTU:                            65536
GENERAL.STATE:                          100 (connected (externally))
GENERAL.CONNECTION:                     lo
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/1
IP4.ADDRESS[1]:                         127.0.0.1/8
IP4.GATEWAY:                            --
IP6.ADDRESS[1]:                         ::1/128
IP6.GATEWAY:                            --

opensuse-syasuda1:~ # ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 02:00:07:de:54:a8 brd ff:ff:ff:ff:ff:ff
    altname enp0s3
    altname ens3
    altname enx020007de54a8
    inet 10.239.0.20/24 brd 10.239.0.255 scope global dynamic noprefixroute eth0
       valid_lft 156sec preferred_lft 156sec
       
opensuse-syasuda1:~ # ip r
default via 10.239.0.1 dev eth0 proto dhcp src 10.239.0.20 metric 100
10.239.0.0/24 dev eth0 proto kernel scope link src 10.239.0.20 metric 100
cmdlineカーネルパラメーター
opensuse-syasuda1:~ # cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-6.12.0-160000.39-default root=UUID=41b87736-08cc-6bd0-85de-d844cd161676 net.ifnames=0 biosdevname=0 vga=normal console=tty1 rw quiet systemd.show_status=1 console=ttyS0,115200 console=tty0 security=selinux selinux=1
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