Hi!
I think the lxc 3.0.4 has a bug in F30 Server. After lxc update:
Code:
lxc-start -n mycontainer

lxc-start centos7-1 20190909175108.821 INFO lxccontainer - lxccontainer.c:do_lxcapi_start:971 - Set process title to [lxc monitor] /var/lib/lxc centos7-1
lxc-start centos7-1 20190909175108.821 INFO lsm - lsm/lsm.c:lsm_init:50 - LSM security driver nop
lxc-start centos7-1 20190909175108.821 INFO seccomp - seccomp.c:parse_config_v2:759 - Processing "reject_force_umount # comment this to allow umount -f; not recommended"
lxc-start centos7-1 20190909175108.821 INFO seccomp - seccomp.c:do_resolve_add_rule:505 - Set seccomp rule to reject force umounts
lxc-start centos7-1 20190909175108.821 INFO seccomp - seccomp.c:parse_config_v2:935 - Added native rule for arch 0 for reject_force_umount action 0(kill)
lxc-start centos7-1 20190909175108.821 INFO seccomp - seccomp.c:do_resolve_add_rule:505 - Set seccomp rule to reject force 
...
lxc-start centos7-1 20190909175108.823 ERROR cgfsng - cgroups/cgfsng.c:mkdir_eexist_on_last:1277 - File exists - Failed to create directory "/sys/fs/cgroup/cpuset//lxc.monitor/centos7-1"
lxc-start centos7-1 20190909175108.823 ERROR cgfsng - cgroups/cgfsng.c:monitor_create_path_for_hierarchy:1298 - Failed to create cgroup "/sys/fs/cgroup/cpuset//lxc.monitor/centos7-1"
lxc-start centos7-1 20190909175108.823 ERROR cgfsng - cgroups/cgfsng.c:cgfsng_monitor_create:1387 - Failed to create cgroup "/sys/fs/cgroup/cpuset//lxc.monitor/centos7-1"
lxc-start centos7-1 20190909175108.824 DEBUG cgfsng - cgroups/cgfsng.c:cg_legacy_filter_and_set_cpus:495 - No isolated or offline cpus present in cpuset
...
lxc-start centos7-1 20190909175108.825 ERROR lxc_start - tools/lxc_start.c:main:334 - Additional information can be obtained by setting the --logfile and --logpriority options
lxc-start centos7-1 20190909175108.827 DEBUG cgfsng - cgroups/cgfsng.c:cg_legacy_filter_and_set_cpus:495 - No isolated or offline cpus present in cpuset
lxc-start centos7-1 20190909175108.827 DEBUG cgfsng - cgroups/cgfsng.c:cg_legacy_handle_cpuset_hierarchy:612 - "cgroup.clone_children" was already set to "1"
lxc-start centos7-1 20190909175108.827 WARN cgfsng - cgroups/cgfsng.c:cgfsng_monitor_destroy:1178 - No space left on device - Failed to move monitor 9894 to "/sys/fs/cgroup/cpuset//lxc.pivot/cgroup.procs"
I downgraded it to v3.0.3, so it's working:
dnf downgrade lxc lxc-*

Will be there is bugfix for v3.0.4?


Similar problem in lxc github: https://github.com/lxc/lxc/issues/3125