linux下home目录迁移

根分区预留不宽裕,du -sh /home 发现home分区占比较大,于是将home目录迁移到新的分区

#添加硬盘后触发扫描echo '- - -' > /sys/class/scsi_host/host2/scan[389][root@liyong: etc]# lsblkNAME        MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTsda           8:0    0   40G  0 disk ├─sda1        8:1    0    1G  0 part /boot└─sda2        8:2    0   39G  0 part   ├─cl-root 253:0    0 35.1G  0 lvm  /  └─cl-swap 253:1    0  3.9G  0 lvm  [SWAP]sdb           8:16   0  100G  0 disk sr0          11:0    1  7.7G  0 rom  #分区gdisk /dev/sdbGPT fdisk (gdisk) version 0.8.6Partition table scan:  MBR: not present  BSD: not present  APM: not present  GPT: not presentCreating new GPT entries.Command (? for help): pDisk /dev/sdb: 209715200 sectors, 100.0 GiBLogical sector size: 512 bytesDisk identifier (GUID): AAB88154-BBA6-4134-9D99-E2168AF3B8F6Partition table holds up to 128 entriesFirst usable sector is 34, last usable sector is 209715166Partitions will be aligned on 2048-sector boundariesTotal free space is 209715133 sectors (100.0 GiB)Number  Start (sector)    End (sector)  Size       Code  NameCommand (? for help): nPartition number (1-128, default 1): 1First sector (34-209715166, default = 2048) or {+-}size{KMGTP}: Last sector (2048-209715166, default = 209715166) or {+-}size{KMGTP}: +10GCurrent type is 'Linux filesystem'Hex code or GUID (L to show codes, Enter = 8300): Changed type of partition to 'Linux filesystem'Command (? for help): ?b   back up GPT data to a filec   change a partition's named   delete a partitioni   show detailed information on a partitionl   list known partition typesn   add a new partitiono   create a new empty GUID partition table (GPT)p   print the partition tableq   quit without saving changesr   recovery and transformation options (experts only)s   sort partitionst   change a partition's type codev   verify diskw   write table to disk and exitx   extra functionality (experts only)?   print this menuCommand (? for help): l0700 Microsoft basic data  0c01 Microsoft reserved    2700 Windows RE          4200 Windows LDM data      4201 Windows LDM metadata  7501 IBM GPFS            7f00 ChromeOS kernel       7f01 ChromeOS root         7f02 ChromeOS reserved   8200 Linux swap            8300 Linux filesystem      8301 Linux reserved      8e00 Linux LVM             a500 FreeBSD disklabel     a501 FreeBSD boot        a502 FreeBSD swap          a503 FreeBSD UFS           a504 FreeBSD ZFS         a505 FreeBSD Vinum/RAID    a580 Midnight BSD data     a581 Midnight BSD boot   a582 Midnight BSD swap     a583 Midnight BSD UFS      a584 Midnight BSD ZFS    a585 Midnight BSD Vinum    a800 Apple UFS             a901 NetBSD swap         a902 NetBSD FFS            a903 NetBSD LFS            a904 NetBSD concatenated a905 NetBSD encrypted      a906 NetBSD RAID           ab00 Apple boot          af00 Apple HFS/HFS+        af01 Apple RAID            af02 Apple RAID offline  af03 Apple label           af04 AppleTV recovery      af05 Apple Core Storage  be00 Solaris boot          bf00 Solaris root          bf01 Solaris /usr & Mac Zbf02 Solaris swap          bf03 Solaris backup        bf04 Solaris /var        bf05 Solaris /home         bf06 Solaris alternate se  bf07 Solaris Reserved 1  bf08 Solaris Reserved 2    bf09 Solaris Reserved 3    bf0a Solaris Reserved 4  bf0b Solaris Reserved 5    c001 HP-UX data            c002 HP-UX service       ed00 Sony system partitio  ef00 EFI System            ef01 MBR partition schemeef02 BIOS boot partition   fb00 VMWare VMFS           fb01 VMWare reserved     fc00 VMWare kcore crash p  fd00 Linux RAID            Command (? for help): wFinal checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTINGPARTITIONS!!Do you want to proceed? (Y/N): yOK; writing new GUID partition table (GPT) to /dev/sdb.The operation has completed successfully.lsblkNAME        MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTsda           8:0    0   40G  0 disk ├─sda1        8:1    0    1G  0 part /boot└─sda2        8:2    0   39G  0 part   ├─cl-root 253:0    0 35.1G  0 lvm  /  └─cl-swap 253:1    0  3.9G  0 lvm  [SWAP]sdb           8:16   0  100G  0 disk └─sdb1        8:17   0   10G  0 part sr0          11:0    1  7.7G  0 rom 分区:mkfs.xfs /dev/sdb1meta-data=/dev/sdb1              isize=512    agcount=4, agsize=655360 blks         =                       sectsz=512   attr=2, projid32bit=1         =                       crc=1        finobt=0, sparse=0data     =                       bsize=4096   blocks=2621440, imaxpct=25         =                       sunit=0      swidth=0 blksnaming   =version 2              bsize=4096   ascii-ci=0 ftype=1log      =internal log           bsize=4096   blocks=2560, version=2         =                       sectsz=512   sunit=0 blks, lazy-count=1realtime =none                   extsz=4096   blocks=0, rtextents=0#挂载mkdir /mnt/sdb1[395][root@liyong: etc]# mount /dev/sdb1 /mnt/sdb1[396][root@liyong: etc]# blkid/dev/sr0: UUID="2016-12-05-13-52-39-00" LABEL="CentOS 7 x86_64" TYPE="iso9660" PTTYPE="dos" /dev/sda1: UUID="c7821fc5-6546-4c67-9749-452eb7da28a6" TYPE="xfs" /dev/sda2: UUID="JkiPfL-PCvJ-3hc2-9gAx-NT3x-vki5-kNPDtM" TYPE="LVM2_member" /dev/mapper/cl-root: UUID="153220ce-da95-45d4-aa79-67d33efdcc88" TYPE="xfs" /dev/mapper/cl-swap: UUID="4509fe4b-faa7-4788-8d70-1ef7b9003ad6" TYPE="swap" /dev/sdb1: UUID="10266f0d-7b03-4d1f-9af2-604477c3ecf6" TYPE="xfs" PARTLABEL="Linux filesystem" PARTUUID="f5410f79-88e3-4f64-8cf7-d1d0255146c3" #备份迁移原来文件夹的内容(确保不再写入,需进入单用户模式操作)[root@liyong: sdb1]# init 1PolicyKit daemon disconnected from the bus.We are no longer a registered authentication agent.Broadcast message from root@liyong on pts/0 (Tue 2017-04-25 23:46:37 CST):The system is going down to rescue mode NOW!cd /mnt/sdb1cp -a /home/* ./[root@liyong: sdb1]# du -sh ./18M ./[root@liyong: sdb1]# du -sh /home18M /home#备份成功后删除home下数据rm -rf /mome/*#讲分区挂载到/home下mount /dev/sdb1 /home#写入配置文件UUID="10266f0d-7b03-4d1f-9af2-604477c3ecf6" TYPE="xfs" /home  xfs defaults 0 0#重启init 3#至此迁移工作完成