解决ubuntu上回环设备/dev/loop0占用100%的问题

更多内容，请查看博客原文 解决ubuntu上回环设备-dev-loop0占用100-的问题

当前ubuntu环境

cat /etc/issue
Ubuntu 19.04 \n \l

当我们查看文件系统占用情况时，发现有/dev/loop0至/dev/loop7占用率为100%。

df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            3.9G     0  3.9G   0% /dev
tmpfs           796M  1.9M  794M   1% /run
/dev/sda1        20G   18G  1.1G  95% /
tmpfs           3.9G     0  3.9G   0% /dev/shm
tmpfs           5.0M  4.0K  5.0M   1% /run/lock
tmpfs           3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/loop0       15M   15M     0 100% /snap/gnome-characters/254
/dev/loop2       90M   90M     0 100% /snap/core/6673
/dev/loop1      3.8M  3.8M     0 100% /snap/gnome-system-monitor/77
/dev/loop3      152M  152M     0 100% /snap/gnome-3-28-1804/31
/dev/loop4       36M   36M     0 100% /snap/gtk-common-themes/1198
/dev/loop7      1.0M  1.0M     0 100% /snap/gnome-logs/61
/dev/loop6       54M   54M     0 100% /snap/core18/941
/dev/loop5      4.2M  4.2M     0 100% /snap/gnome-calculator/406
tmpfs           796M   36K  795M   1% /run/user/1000

/dev/loopn这些设备在Linux下被称为回环设备。

可以通过执行losetup命令查看所有回环设备。

losetup
NAME       SIZELIMIT OFFSET AUTOCLEAR RO BACK-FILE                                         DIO LOG-SEC
/dev/loop1         0      0         1  1 /var/lib/snapd/snaps/gnome-system-monitor_77.snap   0     512
/dev/loop6         0      0         1  1 /var/lib/snapd/snaps/core18_941.snap                0     512
/dev/loop4         0      0         1  1 /var/lib/snapd/snaps/gtk-common-themes_1198.snap    0     512
/dev/loop2         0      0         1  1 /var/lib/snapd/snaps/core_6673.snap                 0     512
/dev/loop0         0      0         1  1 /var/lib/snapd/snaps/gnome-characters_254.snap      0     512
/dev/loop7         0      0         1  1 /var/lib/snapd/snaps/gnome-logs_61.snap             0     512
/dev/loop5         0      0         1  1 /var/lib/snapd/snaps/gnome-calculator_406.snap      0     512
/dev/loop3         0      0         1  1 /var/lib/snapd/snaps/gnome-3-28-1804_31.snap        0     512

我们可以把xxx.iso镜像文件挂载到一个目录下。

mount -o loop xxx.iso /media

等同于执行：

losetup /dev/loop0 xxx.iso
mount /dev/loop0 /media

清理方法

更多内容，请查看博客原文 解决ubuntu上回环设备-dev-loop0占用100-的问题