Add Disk for Aws

AWS 的 ec2 支持不停机扩展磁盘，体验还不错，记录一下操作。

先看看磁盘是不是支持，例如下面的 GPT 的是支持的

$ sudo gdisk -l /dev/xvda
GPT fdisk (gdisk) version 0.8.10

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.
Disk /dev/xvda: 20971520 sectors, 10.0 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 826F22DD-540A-4299-AB06-F03EE98F1CAF
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 20971486
Partitions will be aligned on 2048-sector boundaries
Total free space is 2014 sectors (1007.0 KiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1            4096        20971486   10.0 GiB    8300  Linux
 128            2048            4095   1024.0 KiB  EF02  BIOS Boot Partition

目前磁盘大小

$ df -h
Filesystem      Size  Used Avail Use% Mounted on
devtmpfs        2.0G   56K  2.0G   1% /dev
tmpfs           2.0G     0  2.0G   0% /dev/shm
/dev/xvda1      9.8G  7.3G  2.4G  76% /

去 aws 后台调整一下磁盘大小，只能增加不能减少。这个也可以通过 aws 的命令行来做。

然后等后台显示完成之后，回来看磁盘大小，可以看到 xvda 已经是 15G 了， xvda1 还是 10G。

$ lsblk
NAME    MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
xvda    202:0    0  15G  0 disk
└─xvda1 202:1    0  10G  0 part /

扩展分区大小

[wd@ba2 ~]$ sudo growpart /dev/xvda 1
CHANGED: disk=/dev/xvda partition=1: start=4096 old: size=20967390,end=20971486 new: size=31453150,end=31457246

扩展文件系统大小

$ sudo resize2fs /dev/xvda1
resize2fs 1.42.12 (29-Aug-2014)
Filesystem at /dev/xvda1 is mounted on /; on-line resizing required
old_desc_blocks = 1, new_desc_blocks = 1
The filesystem on /dev/xvda1 is now 3931643 (4k) blocks long.

看看大小

$ df -h
Filesystem      Size  Used Avail Use% Mounted on
devtmpfs        2.0G   56K  2.0G   1% /dev
tmpfs           2.0G     0  2.0G   0% /dev/shm
/dev/xvda1       15G  7.3G  7.3G  50% /

参考链接: https://docs.amazonaws.cn/AWSEC2/latest/UserGuide/recognize-expanded-volume-linux.html