Linux centos7 增加root分区容量

#操作前查看磁盘空间大小

[root@192 /]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 50G 6.0G 44G 12% / devtmpfs 2.8G 0 2.8G 0% /dev tmpfs 2.8G 0 2.8G 0% /dev/shm tmpfs 2.8G 9.1M 2.8G 1% /run tmpfs 2.8G 0 2.8G 0% /sys/fs/cgroup /dev/mapper/centos-home 967G 33M 967G 1% /home /dev/sda1 1014M 180M 835M 18% /boot tmpfs 568M 4.0K 568M 1% /run/user/42 tmpfs 568M 40K 568M 1% /run/user/0 [root@192 /]# clear #查看文件内容 [root@192 /]# ls bin boot dev etc home lib lib64 media mnt opt proc root run sbin srv sys tmp usr var

# 备份 home 分区 [root@192 /]# cp -r /home/ homebak

# 卸载home 目录 [root@192 /]# umount /home/

# 查看文件情况 [root@192 /]# ls bin boot dev etc home homebak lib lib64 media mnt opt proc root run sbin srv sys tmp usr var

# 删除 home 所在的 lvm逻辑卷 [root@192 /]# lvremove /dev/mapper/centos-home Do you really want to remove active logical volume centos/home? [y/n]: y Logical volume "home" successfully removed

#增加 root 所在lvm逻辑卷的容量 [root@192 /]# lvextend -L +200G /dev/mapper/centos-root Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to 250.00 GiB (64000 extents). Logical volume centos/root successfully resized. # 同步 root 文件系统 [root@192 /]# xfs_growfs /dev/mapper/centos-root meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=3276800 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=0 spinodes=0 data = bsize=4096 blocks=13107200, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=1 log =internal bsize=4096 blocks=6400, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 data blocks changed from 13107200 to 65536000 [root@192 /]#

#查看文件容量 [root@192 /]# df -lh Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 250G 6.4G 244G 3% / devtmpfs 2.8G 0 2.8G 0% /dev tmpfs 2.8G 0 2.8G 0% /dev/shm tmpfs 2.8G 9.1M 2.8G 1% /run tmpfs 2.8G 0 2.8G 0% /sys/fs/cgroup /dev/sda1 1014M 180M 835M 18% /boot tmpfs 568M 4.0K 568M 1% /run/user/42 tmpfs 568M 56K 568M 1% /run/user/0 [root@192 /]# cd /root [root@192 ~]# df -lh Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 250G 6.4G 244G 3% / devtmpfs 2.8G 0 2.8G 0% /dev tmpfs 2.8G 0 2.8G 0% /dev/shm tmpfs 2.8G 9.1M 2.8G 1% /run tmpfs 2.8G 0 2.8G 0% /sys/fs/cgroup /dev/sda1 1014M 180M 835M 18% /boot tmpfs 568M 4.0K 568M 1% /run/user/42 tmpfs 568M 56K 568M 1% /run/user/0

#重新创建 home lvm 逻辑卷可以 vgdisplay 查看剩余空间大小 [root@192 ~]# lvcreate -L 660G -n home centos Logical volume "home" created.

#创建home 文件系统 [root@192 ~]# mkfs.xfs /dev/centos/home meta-data=/dev/centos/home isize=512 agcount=4, agsize=43253760 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=0, sparse=0 data = bsize=4096 blocks=173015040, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=1 log =internal log bsize=4096 blocks=84480, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0

#挂载 home分区 [root@192 ~]# mount /dev/centos/home /home [root@192 ~]# ls anaconda-ks.cfg Desktop Documents Downloads initial-setup-ks.cfg Music Pictures Public Templates Videos [root@192 ~]# cd / [root@192 /]# ls bin boot dev etc home homebak lib lib64 media mnt opt proc root run sbin srv sys tmp usr var

#将之前备份的文件拷贝回来 [root@192 /]# cp -r /homebak/* /home [root@192 /]# cd /home [root@192 home]# ls postgers [root@192 home]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 250G 6.4G 244G 3% / devtmpfs 2.8G 0 2.8G 0% /dev tmpfs 2.8G 0 2.8G 0% /dev/shm tmpfs 2.8G 9.1M 2.8G 1% /run tmpfs 2.8G 0 2.8G 0% /sys/fs/cgroup /dev/sda1 1014M 180M 835M 18% /boot tmpfs 568M 4.0K 568M 1% /run/user/42 tmpfs 568M 52K 568M 1% /run/user/0 /dev/mapper/centos-home 660G 33M 660G 1% /home [root@192 home]#

#查看磁盘空间剩余情况

[root@192 home]# vgdisplay
   --- Volume group ---
   VG Name               centos
   System ID
   Format                lvm2
   Metadata Areas        1
   Metadata Sequence No 7
   VG Access             read/write
   VG Status             resizable
   MAX LV                0
   Cur LV                3
   Open LV               3
   Max PV                0
   Cur PV                1
   Act PV                1
   VG Size               <1023.00 GiB
   PE Size               4.00 MiB
   Total PE              261887
   Alloc PE / Size       234432 / 915.75 GiB
   Free PE / Size       27455 / <107.25 GiB
   VG UUID               dhl6Zn-hE2n-ffTU-EsDj-6mYK-lpCD-Hu1JFY

[root@192 home]#

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