CentOS7根目录磁盘扩容(/dev/mapper/centos-root 空间不足)

0.查看根分区大小

[root@master ~]# df -h
Filesystem                      Size  Used Avail Use% Mounted on
devtmpfs                         63G     0   63G   0% /dev
tmpfs                            63G     0   63G   0% /dev/shm
tmpfs                            63G  1.3G   62G   2% /run
tmpfs                            63G     0   63G   0% /sys/fs/cgroup
/dev/mapper/cl_geekthings-root   50G   38G   13G  76% /
/dev/sda1                      1014M  311M  704M  31% /boot
/dev/mapper/cl_geekthings-home  918G   12G  906G   2% /home
tmpfs                            13G   12K   13G   1% /run/user/42
tmpfs                            13G     0   13G   0% /run/user/0
overlay                          50G   38G   13G  76% /var/lib/docker/overlay2/70dffe831895bb55d79b4a8f483364a4f736637ccb2f6694f1cf82ba7ff1743d/merged

1.查看磁盘编号

[root@master ~]# ls /dev/sd*
/dev/sda  /dev/sda1  /dev/sda2

2.这里在vMware vCenter中新增一块硬盘(编辑->新增设备) 再次查看磁盘

[root@master ~]# ls /dev/sd*
/dev/sda  /dev/sda1  /dev/sda2  /dev/sdb

3.对新增硬盘进行分区, 这里新增的磁盘名称叫 /dev/sdb

[root@localhost ~]# fdisk /dev/sdb

# 输入 m, 得到帮助，可以按照提示操作进行分区了
# 因为这块硬盘只有 100G，所以我只打算分一个区，这里是需要输入 n，然后接下来都按 Enter 键，默认即可，最后输入 w 保存退出
[root@localhost ~]# fdisk /dev/sdb
Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Command (m for help): m
Command action
   a   toggle a bootable flag
   b   edit bsd disklabel
   c   toggle the dos compatibility flag
   d   delete a partition
   g   create a new empty GPT partition table
   G   create an IRIX (SGI) partition table
   l   list known partition types
   m   print this menu
   n   add a new partition
   o   create a new empty DOS partition table
   p   print the partition table
   q   quit without saving changes
   s   create a new empty Sun disklabel
   t   change a partition's system id
   u   change display/entry units
   v   verify the partition table
   w   write table to disk and exit
   x   extra functionality (experts only)

4.将分区后的磁盘格式化成xfs类型

[root@localhost ~]# mkfs.xfs /dev/sdb1

5.创建pv

[root@master ~]# pvcreate /dev/sdb1
  Physical volume "/dev/sdb1" successfully created.

6.查看vg组

[root@master ~]# vgs
  VG            #PV #LV #SN Attr   VSize    VFree
  cl_geekthings   1   3   0 wz--n- <999.00g 4.00m

7.扩展vg

[root@master ~]# vgextend cl_geekthings /dev/sdb1
  Volume group "cl_geekthings" successfully extended

[root@master ~]# vgs
  VG            #PV #LV #SN Attr   VSize VFree  
  cl_geekthings   2   3   0 wz--n- 1.17t 200.00g

8.扩展lv

[root@master ~]# lvextend -L +200G /dev/mapper/cl_geekthings-root
  Size of logical volume cl_geekthings/root changed from 50.00 GiB (12800 extents) to 250.00 GiB (64000 extents).
  Logical volume cl_geekthings/root successfully resized.

9.系统重新读取大小

[root@master ~]# xfs_growfs /dev/mapper/cl_geekthings-root
meta-data=/dev/mapper/cl_geekthings-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

10.查看扩容是否成功

[root@master ~]# df -h
Filesystem                      Size  Used Avail Use% Mounted on
devtmpfs                         63G     0   63G   0% /dev
tmpfs                            63G     0   63G   0% /dev/shm
tmpfs                            63G  1.3G   62G   2% /run
tmpfs                            63G     0   63G   0% /sys/fs/cgroup
/dev/mapper/cl_geekthings-root  250G   38G  213G  16% /
/dev/sda1                      1014M  311M  704M  31% /boot
/dev/mapper/cl_geekthings-home  918G   12G  906G   2% /home
tmpfs                            13G   12K   13G   1% /run/user/42
tmpfs                            13G     0   13G   0% /run/user/0
overlay                         250G   38G  213G  16% /var/lib/docker/overlay2/70dffe831895bb55d79b4a8f483364a4f736637ccb2f6694f1cf82ba7ff1743d/merged
[root@master ~]# lsblk
NAME                   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda                      8:0    0  1000G  0 disk 
├─sda1                   8:1    0     1G  0 part /boot
└─sda2                   8:2    0   999G  0 part 
  ├─cl_geekthings-root 253:0    0   250G  0 lvm  /
  ├─cl_geekthings-swap 253:1    0  31.5G  0 lvm  
  └─cl_geekthings-home 253:2    0 917.5G  0 lvm  /home
sdb                      8:16   0   200G  0 disk 
└─cl_geekthings-root   253:0    0   250G  0 lvm  /
sr0                     11:0    1   4.1G  0 rom