Zimbra: Disk /var/lib/snapd/snap/core/… at 100% on mail.example.com
When you have Snap installed on Zimbra instance (while installing Certbot) you may get tons of e-mail from Zimbra monitoring tools with warnings saying:
Mar 9 23:40:24 mail zimbramon[689]: 689:crit: Disk warning: mail.example.com: /var/lib/snapd/snap/snap/1042 on device /dev/loop4 at 100%
This is normal, since all /dev/loopX are read-only and automatically created by Snap. You may see them by executing df -h:
[root@mail ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 1.9G 215M 1.7G 12% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/mapper/centos_mail-root 96G 22G 75G 23% /
/dev/sda1 1014M 193M 822M 19% /boot
tmpfs 379M 0 379M 0% /run/user/0
/dev/loop1 62M 62M 0 100% /var/lib/snapd/snap/core20/904
/dev/loop5 50M 50M 0 100% /var/lib/snapd/snap/certbot/952
/dev/loop2 99M 99M 0 100% /var/lib/snapd/snap/core/10823
/dev/loop0 100M 100M 0 100% /var/lib/snapd/snap/core/10859
/dev/loop4 50M 50M 0 100% /var/lib/snapd/snap/certbot/1042
You may want to exclude these devices from Zimbra’s monitoring by executing zmlocalconfig -e zmstat_df_excludes=’/dev/loop0:/dev/loop1:/dev/loop2:/dev/loop3:/dev/loop4:/dev/loop5:/dev/loopX’ as Zimbra user:
[root@mail ~]# su – zimbra
[zimbra@mail ~]$ zmlocalconfig -e zmstat_df_excludes=’/dev/loop0:/dev/loop1:/dev/loop2:/dev/loop3:/dev/loop4:/dev/loop5’
[zimbra@mail ~]$ zmstatctl restart