openstack 磁盘扩容

OpenStack虚拟机根分区20G

通过镜像创建虚拟机时，创建的虚拟机的根分区可能与镜像大小相同，需要调整。

磁盘有100G，根分区太小

[root@host-10-255-98-178 ~]# lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda      8:0    0  100G  0 disk
├─sda1   8:1    0  200M  0 part /boot
├─sda2   8:2    0 15.8G  0 part /
└─sda3   8:3    0    4G  0 part [swap]

关闭swap

[root@host-10-255-98-178 ~]# swapoff -a
[root@host-10-255-98-178 ~]# free -m
              total        used        free      shared  buff/cache   available
Mem:           7982         103        7757           8         121        7674
Swap:             0           0           0

删除swap分区及 / 分区，将剩下的磁盘新建分区，并保存

[root@host-10-255-98-178 ~]# fdisk /dev/sda
Command (m for help): p
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      411647      204800   83  Linux
/dev/sda2          411648    33554431    16571392   83  Linux
/dev/sda3        33554432    41943039     4194304   82  Linux swap / Solaris
# 删除swap分区
Command (m for help): d
Partition number (1-3, default 3):
Partition 3 is deleted
# 删除/分区
Command (m for help): d
Partition number (1,2, default 2):
Partition 2 is deleted
#新建分区
Command (m for help): n
Partition type:
   p   primary (1 primary, 0 extended, 3 free)
   e   extended
Select (default p):
Using default response p
Partition number (2-4, default 2):
First sector (411648-209715199, default 411648):
Using default value 411648
Last sector, +sectors or +size{K,M,G} (411648-209715199, default 209715199):
Using default value 209715199
Partition 2 of type Linux and of size 99.8 GiB is set
​
Command (m for help): p
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      411647      204800   83  Linux
/dev/sda2          411648   209715199   104651776   83  Linux
# 保存
Command (m for help): w

编辑/etc/fstab 文件，取消对 swap 分区的开机自动挂载后重启服务器

[root@host-10-255-98-178 ~]# reboot
[root@host-10-255-98-178 ~]# resize2fs /dev/sda2
[root@host-10-255-98-178 ~]# reboot

重启后查看分区

[root@host-10-255-98-178 data]# lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda      8:0    0  100G  0 disk
├─sda1   8:1    0  200M  0 part /boot
└─sda2   8:2    0 99.8G  0 part /