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LXD Adjusting size of root device

lxc config show openvpn  
architecture: x86_64 
config: 
 image.architecture: amd64 
 image.description: ubuntu 16.04 LTS amd64 (release) (20180306) 
 image.label: release 
 image.os: ubuntu 
 image.release: xenial 
 image.serial: "20180306" 
 image.version: "16.04" 
 raw.lxc: lxc.cgroup.devices.allow = c 10:200 rwm 
 volatile.base_image: c5bbef7f4e1c19f0104fd49b862b2e549095d894765c75c6d72775f1d98185ec 
 volatile.eth0.hwaddr: 00:16:3e:88:32:82 
 volatile.eth0.name: eth0 
 volatile.idmap.base: "0" 
 volatile.idmap.next: '[{"Isuid":true,"Isgid":false,"Hostid":165536,"Nsid":0,"Maprange":65536},{"Isuid":false,"Isgid":true,"Hostid":165536,"
Nsid":0,"Maprange":65536}]' 
 volatile.last_state.idmap: '[{"Isuid":true,"Isgid":false,"Hostid":165536,"Nsid":0,"Maprange":65536},{"Isuid":false,"Isgid":true,"Hostid":16
5536,"Nsid":0,"Maprange":65536}]' 
 volatile.last_state.power: RUNNING 
devices: 
 net-tun: 
   path: /dev/net/tun 
   type: unix-char 
ephemeral: false 
profiles: 
- default 
stateful: false 
description: ""

lxc config device add openvpn root disk pool=default path=/ size=10GB

lxc config show openvpn

                     
architecture: x86_64 
config: 
 image.architecture: amd64 
 image.description: ubuntu 16.04 LTS amd64 (release) (20180306) 
 image.label: release 
 image.os: ubuntu 
 image.release: xenial 
 image.serial: "20180306" 
 image.version: "16.04" 
 raw.lxc: lxc.cgroup.devices.allow = c 10:200 rwm 
 volatile.base_image: c5bbef7f4e1c19f0104fd49b862b2e549095d894765c75c6d72775f1d98185ec 
 volatile.eth0.hwaddr: 00:16:3e:88:32:82 
 volatile.eth0.name: eth0 
 volatile.idmap.base: "0" 
 volatile.idmap.next: '[{"Isuid":true,"Isgid":false,"Hostid":165536,"Nsid":0,"Maprange":65536},{"Isuid":false,"Isgid":true,"Hostid":165536,"
Nsid":0,"Maprange":65536}]' 
 volatile.last_state.idmap: '[{"Isuid":true,"Isgid":false,"Hostid":165536,"Nsid":0,"Maprange":65536},{"Isuid":false,"Isgid":true,"Hostid":16
5536,"Nsid":0,"Maprange":65536}]' 
 volatile.last_state.power: RUNNING 
devices: 
 net-tun: 
   path: /dev/net/tun 
   type: unix-char 
 root: 
   path: / 
   pool: default 
   size: 10GB 
   type: disk 
ephemeral: false 
profiles: 
- default 
stateful: false 

description: openvpn server

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