I have been having intermittent issues since the 3.14 release that gave some people issues with the snap update and LXD failing (post here: LXD 3.14 on snap fails). I have done the workaround (creating a .SQL file and refreshing the snap, or in my case, reverting the snap worked) to get LXD at least functional. I recently had to do this again for some reason and now when I run “lxc list” I have 0 containers listed and my storage pool has disappeared (as in not seen by LXD). Here is the output of the /var/snap/lxd/common/lxd/logs/lxd.log:
t=2019-07-22T00:43:13+0000 lvl=info msg=“LXD 3.14 is starting in normal mode” path=/var/snap/lxd/common/lxd
t=2019-07-22T00:43:13+0000 lvl=info msg=“Kernel uid/gid map:”
t=2019-07-22T00:43:13+0000 lvl=info msg=" - u 0 0 4294967295"
t=2019-07-22T00:43:13+0000 lvl=info msg=" - g 0 0 4294967295"
t=2019-07-22T00:43:13+0000 lvl=info msg=“Configured LXD uid/gid map:”
t=2019-07-22T00:43:13+0000 lvl=info msg=" - u 0 1000000 1000000000"
t=2019-07-22T00:43:13+0000 lvl=info msg=" - g 0 1000000 1000000000"
t=2019-07-22T00:43:13+0000 lvl=warn msg=“CGroup memory swap accounting is disabled, swap limits will be ignored.”
t=2019-07-22T00:43:13+0000 lvl=info msg=“Kernel features:”
t=2019-07-22T00:43:13+0000 lvl=info msg=" - netnsid-based network retrieval: no"
t=2019-07-22T00:43:13+0000 lvl=info msg=" - uevent injection: no"
t=2019-07-22T00:43:13+0000 lvl=info msg=" - seccomp listener: no"
t=2019-07-22T00:43:13+0000 lvl=info msg=" - unprivileged file capabilities: yes"
t=2019-07-22T00:43:13+0000 lvl=info msg=" - shiftfs support: no"
t=2019-07-22T00:43:13+0000 lvl=info msg=“Initializing local database”
t=2019-07-22T00:43:14+0000 lvl=info msg=“Starting /dev/lxd handler:”
t=2019-07-22T00:43:14+0000 lvl=info msg=" - binding devlxd socket" socket=/var/snap/lxd/common/lxd/devlxd/sock
t=2019-07-22T00:43:14+0000 lvl=info msg=“REST API daemon:”
t=2019-07-22T00:43:14+0000 lvl=info msg=" - binding Unix socket" inherited=true socket=/var/snap/lxd/common/lxd/unix.socket
t=2019-07-22T00:43:14+0000 lvl=info msg=" - binding TCP socket" socket=[::]:8443
t=2019-07-22T00:43:14+0000 lvl=info msg=“Initializing global database”
t=2019-07-22T00:43:14+0000 lvl=info msg=“Initializing storage pools”
t=2019-07-22T00:43:14+0000 lvl=info msg=“Initializing networks”
t=2019-07-22T00:43:14+0000 lvl=info msg=“Pruning leftover image files”
t=2019-07-22T00:43:14+0000 lvl=info msg=“Done pruning leftover image files”
t=2019-07-22T00:43:14+0000 lvl=info msg=“Loading daemon configuration”
t=2019-07-22T00:43:14+0000 lvl=info msg=“Pruning expired images”
t=2019-07-22T00:43:14+0000 lvl=info msg=“Done pruning expired images”
t=2019-07-22T00:43:14+0000 lvl=info msg=“Pruning expired container backups”
t=2019-07-22T00:43:14+0000 lvl=info msg=“Done pruning expired container backups”
t=2019-07-22T00:43:14+0000 lvl=info msg=“Expiring log files”
t=2019-07-22T00:43:14+0000 lvl=info msg=“Updating instance types”
t=2019-07-22T00:43:14+0000 lvl=info msg=“Updating images”
t=2019-07-22T00:43:14+0000 lvl=info msg=“Done updating instance types”
t=2019-07-22T00:43:14+0000 lvl=info msg=“Done updating images”
t=2019-07-22T00:43:14+0000 lvl=info msg=“Done expiring log files”