Resource limits: Show configuration 

# Show default profile for all VMs
# lxc profile list
# Show configuration for the default profile
# lxc profile show default

Storage space
List available LXD storage space
Use lxc storage list to show the used storage name(f.e. “default”). 

# lxc storage info default

Resource limits: Hard disk space
Limit maximum total disk space allocation for all VMs up to 20 GB:

# lxc profile device set default root size 20GB

Resource limits: Hard disk space
Limit maximum total disk space allocation for one VM: 

# lxc config device set $vmnmae root size 20GB

Resource limits: CPU
Limit CPU usage for all VMs: 

# lxc profile set default limits.cpu.allowance 25ms/200ms

Resource limits: CPU
Limit CPU usage for one specific VM: 

# lxc config set $vmname limits.cpu.allowance 25ms/200ms

Resource limits: RAM
Limit RAM usage for all VMs: 

# lxc profile set default limits.memory 1024MB

Resource limits: RAM
Limit RAM usage for one specific VM: 

# lxc config set $vmname limits.memory 1024MB

More detailed instructions can be found here: Stgrabers LXD blog