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解决ubuntu上回环设备/dev/loop0占用100%的问题

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当前ubuntu环境

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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%。

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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。

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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。

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mount -o loop xxx.iso /media

等同于执行：

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

清理方法

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sudo apt autoremove --purge snapd
[sudo] password for simon: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  gnome-software gnome-software-common
Suggested packages:
  apt-config-icons-hidpi gnome-software-plugin-flatpak
Recommended packages:
  gnome-software-plugin-snap
The following packages will be REMOVED:
  apg* gnome-control-center-faces* gnome-online-accounts* gnome-software-plugin-snap* libclutter-imcontext-0.1-0* libclutter-imcontext-0.1-bin*
  libcolord-gtk1* libgsound0* libgtop-2.0-11* libgtop2-common* mobile-broadband-provider-info* network-manager-gnome* python3-macaroonbakery*
  python3-protobuf* python3-rfc3339* python3-tz* snapd* ubuntu-system-service*
The following packages will be upgraded:
  gnome-software gnome-software-common
2 upgraded, 0 newly installed, 18 to remove and 171 not upgraded.
Need to get 2,982 kB of archives.
After this operation, 73.7 MB disk space will be freed.
Do you want to continue? [Y/n] y

再次查看磁盘使用情况：

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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  1.6G  92% /
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
tmpfs           796M   36K  795M   1% /run/user/1000
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