99g：linux centos7完整记录对根目录的磁盘扩容过程（扩容99G）

改变磁盘大小之后需要重启才能生效。

[root@k8s-nfs ~]# lsblkNAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTfd0 2:0 1 4K 0 disk sda 8:0 0 200G 0 disk ├─sda1 8:1 0 1G 0 part /boot└─sda2 8:2 0 99G 0 part ├─centos-root 253:0 0 88G 0 lvm / ├─centos-swap 253:1 0 1016M 0 lvm └─centos-home 253:2 0 10G 0 lvm /homesr0 11:0 1 1024M 0 rom [root@k8s-nfs ~]# [root@k8s-nfs ~]# [root@k8s-nfs ~]# [root@k8s-nfs ~]# fdisk /dev/sda欢迎使用 fdisk (util-linux 2.23.2)。更改将停留在内存中，直到您决定将更改写入磁盘。使用写入命令前请三思。命令(输入 m 获取帮助)：nPartition type: p primary (2 primary, 0 extended, 2 free) e extendedSelect (default p): Using default response p分区号 (3,4，默认 3)：起始 扇区 (209715200-419430399，默认为 209715200)：将使用默认值 209715200Last 扇区, +扇区 or +size{K,M,G} (209715200-419430399，默认为 419430399)：+100G值超出范围。Last 扇区, +扇区 or +size{K,M,G} (209715200-419430399，默认为 419430399)：+99G分区 3 已设置为 Linux 类型，大小设为 99 GiB命令(输入 m 获取帮助)：wThe partition table has been altered!Calling ioctl() to re-read partition table.WARNING: Re-reading the partition table failed with error 16: 设备或资源忙.The kernel still uses the old table. The new table will be used atthe next reboot or after you run partprobe(8) or kpartx(8)正在同步磁盘。[root@k8s-nfs ~]# partprobe [root@k8s-nfs ~]# lsblkNAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTfd0 2:0 1 4K 0 disk sda 8:0 0 200G 0 disk ├─sda1 8:1 0 1G 0 part /boot├─sda2 8:2 0 99G 0 part │ ├─centos-root 253:0 0 88G 0 lvm /│ ├─centos-swap 253:1 0 1016M 0 lvm │ └─centos-home 253:2 0 10G 0 lvm /home└─sda3 8:3 0 99G 0 part sr0 11:0 1 1024M 0 rom [root@k8s-nfs ~]# lvmlvm> pvcreate /dev/sda3 Physical volume "/dev/sda3" successfully created.lvm> pvdisplay --- Physical volume --- PV Name /dev/sda2 VG Name centos PV Size <99.00 GiB / not usable 3.00 MiB Allocatable yes PE Size 4.00 MiB Total PE 25343 Free PE 1 Allocated PE 25342 PV UUID efjCC5-9SmV-uA13-o0vW-uumQ-HuE2-VvvsEw "/dev/sda3" is a new physical volume of "99.00 GiB" --- NEW Physical volume --- PV Name /dev/sda3 VG Name PV Size 99.00 GiB Allocatable NO PE Size 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID yyfutw-19wS-Jegf-SX8Q-IAY0-4fZQ-R1qsHW lvm> vgdisplay --- Volume group --- VG Name centos System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 3 Open LV 2 Max PV 0 Cur PV 1 Act PV 1 VG Size <99.00 GiB PE Size 4.00 MiB Total PE 25343 Alloc PE / Size 25342 / 98.99 GiB Free PE / Size 1 / 4.00 MiB VG UUID sv7bTd-obHA-xJwy-YvzC-f0NV-v8xG-rwmfiK lvm> vgextend centos /dev/sda3 Volume group "centos" successfully extendedlvm> vgdisplay --- Volume group --- VG Name centos System ID Format lvm2 Metadata Areas 2 Metadata Sequence No 5 VG Access read/write VG Status resizable MAX LV 0 Cur LV 3 Open LV 2 Max PV 0 Cur PV 2 Act PV 2 VG Size 197.99 GiB PE Size 4.00 MiB Total PE 50686 Alloc PE / Size 25342 / 98.99 GiB Free PE / Size 25344 / 99.00 GiB VG UUID sv7bTd-obHA-xJwy-YvzC-f0NV-v8xG-rwmfiK lvm> lvextend -l +100%FREE /dev/centos/root Size of logical volume centos/root changed from 88.00 GiB (22528 extents) to 187.00 GiB (47872 extents). Logical volume centos/root successfully resized.lvm> ^C[root@k8s-nfs ~]# xfs_growfs /dev/centos/root meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=5767168 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=0 spinodes=0data = bsize=4096 blocks=23068672, imaxpct=25 = sunit=0 swidth=0 blksnaming =version 2 bsize=4096 ascii-ci=0 ftype=1log =internal bsize=4096 blocks=11264, version=2 = sectsz=512 sunit=0 blks, lazy-count=1realtime =none extsz=4096 blocks=0, rtextents=0data blocks changed from 23068672 to 49020928[root@k8s-nfs ~]# df -h文件系统 容量 已用 可用 已用% 挂载点devtmpfs 7.9G 0 7.9G 0% /devtmpfs 7.9G 0 7.9G 0% /dev/shmtmpfs 7.9G 8.9M 7.9G 1% /runtmpfs 7.9G 0 7.9G 0% /sys/fs/cgroup/dev/mapper/centos-root 187G 2.6G 185G 2% //dev/sda1 1014M 137M 878M 14% /boot/dev/mapper/centos-home 10G 33M 10G 1% /hometmpfs 1.6G 0 1.6G 0% /run/user/0[root@k8s-nfs ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTfd0 2:0 1 4K 0 disk sda 8:0 0 200G 0 disk ├─sda1 8:1 0 1G 0 part /boot├─sda2 8:2 0 99G 0 part │ ├─centos-root 253:0 0 187G 0 lvm /│ ├─centos-swap 253:1 0 1016M 0 lvm │ └─centos-home 253:2 0 10G 0 lvm /home└─sda3 8:3 0 99G 0 part └─centos-root 253:0 0 187G 0 lvm /sr0 11:0 1 1024M 0 rom [root@k8s-nfs ~]#

参考链接：
https://blog.csdn.net/qq_24871519/article/details/86243571
https://blog.csdn.net/harryxxxxx/article/details/81114613
https://blog.csdn.net/nimasike/article/details/53729499