lxc-checkconfig

returns:

Kernel configuration not found at /proc/config.gz; searching...
Kernel configuration found at /boot/config-5.4.0-58-generic
--- Namespaces ---
Namespaces: enabled
Utsname namespace: enabled
Ipc namespace: enabled
Pid namespace: enabled
User namespace: enabled
Network namespace: enabled
 
--- Control groups ---
Cgroups: enabled
 
Cgroup v1 mount points: 
/sys/fs/cgroup/systemd
/sys/fs/cgroup/blkio
/sys/fs/cgroup/freezer
/sys/fs/cgroup/devices
/sys/fs/cgroup/pids
/sys/fs/cgroup/memory
/sys/fs/cgroup/cpu,cpuacct
/sys/fs/cgroup/net_cls,net_prio
/sys/fs/cgroup/hugetlb
/sys/fs/cgroup/rdma
/sys/fs/cgroup/cpuset
/sys/fs/cgroup/perf_event
 
Cgroup v2 mount points: 
/sys/fs/cgroup/unified
 
Cgroup v1 clone_children flag: enabled
Cgroup device: enabled
Cgroup sched: enabled
Cgroup cpu account: enabled
Cgroup memory controller: enabled
Cgroup cpuset: enabled
 
--- Misc ---
Veth pair device: enabled, loaded
Macvlan: enabled, loaded
Vlan: enabled, loaded
Bridges: enabled, loaded
Advanced netfilter: enabled, loaded
CONFIG_NF_NAT_IPV4: missing
CONFIG_NF_NAT_IPV6: missing
CONFIG_IP_NF_TARGET_MASQUERADE: enabled, not loaded
CONFIG_IP6_NF_TARGET_MASQUERADE: enabled, not loaded
CONFIG_NETFILTER_XT_TARGET_CHECKSUM: enabled, loaded
CONFIG_NETFILTER_XT_MATCH_COMMENT: enabled, loaded
FUSE (for use with lxcfs): enabled, not loaded
 
--- Checkpoint/Restore ---
checkpoint restore: enabled
CONFIG_FHANDLE: enabled
CONFIG_EVENTFD: enabled
CONFIG_EPOLL: enabled
CONFIG_UNIX_DIAG: enabled
CONFIG_INET_DIAG: enabled
CONFIG_PACKET_DIAG: enabled
CONFIG_NETLINK_DIAG: enabled
File capabilities: 
 
Note : Before booting a new kernel, you can check its configuration
usage : CONFIG=/path/to/config /usr/bin/lxc-checkconfig