参考文章
https://blog.csdn.net/weixin_28848317/article/details/116647116?spm=1001.2101.3001.6661.1&utm_medium=distribute.pc_relevant_t0.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-1-116647116-blog-54933188.235%5Ev38%5Epc_relevant_default_base&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-1-116647116-blog-54933188.235%5Ev38%5Epc_relevant_default_base&utm_relevant_index=1
执行指令
[root@centos7 ~]# cd /opt
[root@centos7 opt]# dd if=/dev/zero of=test.img bs=10M count=1
1+0 records in
1+0 records out
10485760 bytes (10 MB) copied, 0.0209482 s, 501 MB/s
[root@centos7 opt]#
[root@centos7 opt]#
[root@centos7 opt]# losetup -f
/dev/loop0
[root@centos7 opt]# losetup /dev/loop0 test.img
[root@centos7 opt]#
[root@centos7 opt]# mkfs.ext4 /dev/loop0 -N 5
mke2fs 1.42.9 (28-Dec-2013)
Discarding device blocks: done
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
Stride=0 blocks, Stripe width=0 blocks
16 inodes, 10240 blocks
512 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=10485760
2 block groups
8192 blocks per group, 8192 fragments per group
8 inodes per group
Superblock backups stored on blocks:
8193
Allocating group tables: done
Writing inode tables: done
Creating journal (1024 blocks): done
Writing superblocks and filesystem accounting information: done
[root@centos7 opt]# losetup -d /dev/loop0
[root@centos7 opt]# cd /mnt/rui
[root@centos7 rui]# mkdir test
[root@centos7 opt]# mount -o loop test.img /mnt/rui/test/
[root@centos7 opt]#
[root@centos7 opt]# cd /mnt/rui/test
[root@centos7 test]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 1.9G 320K 1.9G 1% /dev/shm
tmpfs 1.9G 93M 1.8G 5% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/mapper/centos-root 90G 48G 43G 53% /
/dev/sda1 4.0G 197M 3.8G 5% /boot
tmpfs 378M 0 378M 0% /run/user/1000
tmpfs 378M 0 378M 0% /run/user/0
overlay 90G 48G 43G 53% /var/lib/docker/overlay2/da83d894ebfb5eb7641a578a4f53b6
/dev/loop0 9.0M 172K 8.2M 3% /mnt/rui/test
[root@centos7 opt]#
[root@centos7 opt]#
[root@centos7 test]# df -i
Filesystem Inodes IUsed IFree IUse% Mounted on
devtmpfs 479649 360 479289 1% /dev
tmpfs 482660 2 482658 1% /dev/shm
tmpfs 482660 1456 481204 1% /run
tmpfs 482660 16 482644 1% /sys/fs/cgroup
/dev/mapper/centos-root 47183872 748812 46435060 2% /
/dev/sda1 2097152 334 2096818 1% /boot
tmpfs 482660 1 482659 1% /run/user/1000
tmpfs 482660 1 482659 1% /run/user/0
overlay 47183872 748812 46435060 2% /var/lib/docker/overlay2/da83d894ebfb5eb7641a57a/merged
/dev/loop0 16 11 5 69% /mnt/rui/test
