/dev/loop 사용률 100%로 인한 'No space left on device' 에러 > 기술자료

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'No space left on device 오류를 해결하는 방법입니다.


1. 홈페이지 접속이 유독 불안정해서 df 명령어로 서버의 저장공간을 확인합니다.



happyjung@happyjung_srv:~$ df
Filesystem     1K-blocks      Used Available Use% Mounted on
udev             4042396         0   4042396   0% /dev
tmpfs             815244      1420    813824   1% /run
/dev/sda4      227954100  13706928 202594924   7% /
tmpfs            4076212         0   4076212   0% /dev/shm
tmpfs               5120         0      5120   0% /run/lock
tmpfs            4076212         0   4076212   0% /sys/fs/cgroup
/dev/loop0        108416    108416         0 100% /snap/core/16202
/dev/loop1        108416    108416         0 100% /snap/core/16091
/dev/sda2         498900    226388    235816  49% /boot
/dev/sdc1      479564464        28 455130468   1% /backup
/dev/sdb1      479564464 292195816 162934680  65% /var/www
tmpfs             815240         0    815240   0% /run/user/0
tmpfs             815240         0    815240   0% /run/user/1000


2. 전에 없던 /dev/loop*  디바이스가 없었는데, 사용량 100% 의 loop 값이 확인됩니다.
내용을 더 자세히 보기 위해 아래와 같이 명령어를 실행합니다.

happyjung@happyjung_srv:~$ losetup
NAME       SIZELIMIT OFFSET AUTOCLEAR RO BACK-FILE                            DIO LOG-SEC
/dev/loop1         0      0         1  1 /var/lib/snapd/snaps/core_16091.snap   0     512
/dev/loop0         0      0         1  1 /var/lib/snapd/snaps/core_16202.snap   0     512



3. root 로 로그인을 합니다.

happyjung@happyjung_srv:~$ sudo -i
[sudo] password for happyjung: 



4. 아래 명령어를 실행하면 루프 디바이스가 모두 제거됩니다.

root@happyjung_srv:~# sudo apt autoremove --purge snapd
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be REMOVED:
  snapd*
0 upgraded, 0 newly installed, 1 to remove and 96 not upgraded.
After this operation, 171 MB disk space will be freed.
Do you want to continue? [Y/n] 
(Reading database ... 147954 files and directories currently installed.)
Removing snapd (2.58+18.04.1) ...
Warning: Stopping snapd.service, but it can still be activated by:
  snapd.socket
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
Processing triggers for dbus (1.12.2-1ubuntu1.4) ...
Processing triggers for mime-support (3.60ubuntu1) ...
(Reading database ... 147858 files and directories currently installed.)
Purging configuration files for snapd (2.58+18.04.1) ...
Stopping snap-core-16091.mount
Stopping unit snap-core-16091.mount
Waiting until unit snap-core-16091.mount is stopped [attempt 1]
snap-core-16091.mount is stopped.
Removing snap core and revision 16091
Removing snap-core-16091.mount
Stopping snap-core-16202.mount
Stopping unit snap-core-16202.mount
Waiting until unit snap-core-16202.mount is stopped [attempt 1]
snap-core-16202.mount is stopped.
Removing snap core and revision 16202
Removing snap-core-16202.mount
Discarding preserved snap namespaces
Final directory cleanup
Removing extra snap-confine apparmor rules
Removing snapd cache
Removing snapd state


5. df 명령어로 디스크 용량을 확인하니, loop 가 삭제되었습니다.

root@happyjung_srv:~# df
Filesystem     1K-blocks      Used Available Use% Mounted on
udev             4042396         0   4042396   0% /dev
tmpfs             815244      1428    813816   1% /run
/dev/sda4      227954100  13142164 203159688   7% /
tmpfs            4076212         0   4076212   0% /dev/shm
tmpfs               5120         0      5120   0% /run/lock
tmpfs            4076212         0   4076212   0% /sys/fs/cgroup
/dev/sda2         498900    226388    235816  49% /boot
/dev/sdc1      479564464        28 455130468   1% /backup
/dev/sdb1      479564464 292195964 162934532  65% /var/www
tmpfs             815240         0    815240   0% /run/user/0
tmpfs             815240         0    815240   0% /run/user/1000





참고자료
https://beausty23.tistory.com/234