增加 EC2 硬碟空間
要增加 EC2 的硬碟空間，可以直接修改 Elastic Volume 的大小，並在主機內下指令即可立即變更硬碟空間大小
1. 從 EC2 找出 Elastic Volume
2. 修改 Elastic Volume 大小
3. 檢視目前硬碟空間配置
修改完 Elastic Volume 後，使用 df -h 可以看到目前的硬碟空間還是沒有變的
$ df -h
Filesystem Size Used Avail Use% Mounted on
udev 992M 0 992M 0% /dev
tmpfs 200M 14M 187M 7% /run
/dev/xvda1 49G 36G 14G 73% /
tmpfs 1000M 0 1000M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 1000M 0 1000M 0% /sys/fs/cgroup
/dev/loop0 18M 18M 0 100% /snap/amazon-ssm-agent/1068
/dev/loop1 18M 18M 0 100% /snap/amazon-ssm-agent/930
/dev/loop2 92M 92M 0 100% /snap/core/6531
/dev/loop3 90M 90M 0 100% /snap/core/6673
/dev/loop4 91M 91M 0 100% /snap/core/6405
/dev/loop5 17M 17M 0 100% /snap/amazon-ssm-agent/784
tmpfs 200M 0 200M 0% /run/user/1001
tmpfs 200M 0 200M 0% /run/user/1003
tmpfs 200M 0 200M 0% /run/user/1010
tmpfs 200M 0 200M 0% /run/user/1002
使用 lsblk 可以看到 xvda 的空間已經變成我們修改的 100G 了，但目前還無法使用
xvda 202:0 0 100G 0 disk
`-xvda1 202:1 0 50G 0 part /
$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
xvda 202:0 0 100G 0 disk
`-xvda1 202:1 0 50G 0 part /
loop0 7:0 0 17.9M 1 loop /snap/amazon-ssm-agent/1068
loop1 7:1 0 18M 1 loop /snap/amazon-ssm-agent/930
loop2 7:2 0 91.1M 1 loop /snap/core/6531
loop3 7:3 0 89.3M 1 loop /snap/core/6673
loop4 7:4 0 91M 1 loop /snap/core/6405
loop5 7:5 0 16.5M 1 loop /snap/amazon-ssm-agent/784
4. 擴展可用的硬碟空間配置
使用 sudo growpart /dev/xvda 1 擴展可用的硬碟空間配置
$ sudo growpart /dev/xvda 1
[sudo] password for kejyun:
CHANGED: partition=1 start=2048 old: size=104855519 end=104857567 new: size=209713119,end=209715167
擴展後可以看到目前的可用空間已經擴展至 100 G 了
xvda 202:0 0 100G 0 disk
`-xvda1 202:1 0 100G 0 part /
$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
xvda 202:0 0 100G 0 disk
`-xvda1 202:1 0 100G 0 part /
loop0 7:0 0 17.9M 1 loop /snap/amazon-ssm-agent/1068
loop1 7:1 0 18M 1 loop /snap/amazon-ssm-agent/930
loop2 7:2 0 91.1M 1 loop /snap/core/6531
loop3 7:3 0 89.3M 1 loop /snap/core/6673
loop4 7:4 0 91M 1 loop /snap/core/6405
loop5 7:5 0 16.5M 1 loop /snap/amazon-ssm-agent/784
5. 重新配置可用的硬碟空間
使用 sudo resize2fs /dev/xvda1 指令重新配置可用的硬碟空間
$ sudo resize2fs /dev/xvda1
resize2fs 1.42.13 (17-May-2015)
Filesystem at /dev/xvda1 is mounted on /; on-line resizing required
old_desc_blocks = 4, new_desc_blocks = 7
The filesystem on /dev/xvda1 is now 26214139 (4k) blocks long.
重新配置完成後，可以看到 /dev/xvda1 的空間已經變成 100G 了
/dev/xvda1 97G 36G 62G 37% /
$ df -h
Filesystem Size Used Avail Use% Mounted on
udev 992M 0 992M 0% /dev
tmpfs 200M 14M 187M 7% /run
/dev/xvda1 97G 36G 62G 37% /
tmpfs 1000M 0 1000M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 1000M 0 1000M 0% /sys/fs/cgroup
/dev/loop0 18M 18M 0 100% /snap/amazon-ssm-agent/1068
/dev/loop1 18M 18M 0 100% /snap/amazon-ssm-agent/930
/dev/loop2 92M 92M 0 100% /snap/core/6531
/dev/loop3 90M 90M 0 100% /snap/core/6673
/dev/loop4 91M 91M 0 100% /snap/core/6405
/dev/loop5 17M 17M 0 100% /snap/amazon-ssm-agent/784
tmpfs 200M 0 200M 0% /run/user/1001
tmpfs 200M 0 200M 0% /run/user/1003
tmpfs 200M 0 200M 0% /run/user/1010
tmpfs 200M 0 200M 0% /run/user/1002