View source for LXD/LXD Installation

== PART II - LXD Installation ==
=== Installing LXD in Funtoo ===
==== Kernel pre-requisities ====
These options should be '''disabled''' in your kernel to use all of the functions of LXD:
<code>
  GRKERNSEC_CHROOT_CAPS
  GRKERNSEC_CHROOT_CHMOD
  GRKERNSEC_CHROOT_DOUBLE
  GRKERNSEC_CHROOT_MOUNT
  GRKERNSEC_CHROOT_PIVOT
  GRKERNSEC_PROC
  GRKERNSEC_SYSFS_RESTRICT
  NETPRIO_CGROUP
</code>
These options should be '''enabled''' in your kernel to use all of the functions of LXD:
<code>
  BRIDGE
  CGROUP_CPUACCT
  CGROUP_DEVICE
  CGROUP_FREEZER
  CGROUP_SCHED
  CGROUPS
  CHECKPOINT_RESTORE
  CPUSETS
  DUMMY
  EPOLL 
  EVENTFD 
  FHANDLE 
  IA32_EMULATION 
  INET_DIAG 
  INET_TCP_DIAG
  INET_UDP_DIAG
  INOTIFY_USER
  IP_NF_NAT
  IP_NF_TARGET_MASQUERADE
  IP6_NF_NAT
  IP6_NF_TARGET_MASQUERADE
  IPC_NS
  IPV6
  MACVLAN
  NAMESPACES 
  NET_IPGRE
  NET_IPGRE_DEMUX
  NET_IPIP
  NET_NS
  NETFILTER_XT_MATCH_COMMENT
  NETLINK_DIAG
  NF_NAT_MASQUERADE_IPV4
  NF_NAT_MASQUERADE_IPV6
  PACKET_DIAG 
  PID_NS 
  POSIX_MQUEUE
  UNIX_DIAG
  USER_NS
  UTS_NS
  VETH
  VXLAN
</code>
{{note|The Funtoo's default kernel ({{Package|sys-kernel/debian-sources}} – v. 4.11.11 at the time of writing) has all these options enabled.}}

{{tip|On older kernels <code>DEVPTS_MULTIPLE_INSTANCES</code> is needed too (as of kernel version 4.11.11 - the option doesn't exist any more)}}

LXC package comes with an utility to check all needed config options. 

{{console|body=
###i## CONFIG=/path/to/config /usr/bin/lxc-checkconfig 
}}

You can also use this code to compare your config settings with the ones needed. Put the required config options in a kernel-req.txt file and run the script.

{{file|name=kerncheck.py|lang=python|desc=check kernel options|body=
import gzip

REQF = "kernel-req.txt"    # copy kernel options requirements into this file
REQS = set()
CFGS = set()

with open(REQF) as f:
    for line in f:
        REQS.add("CONFIG_%s" % line.strip())

with gzip.open("/proc/config.gz") as f:
    for line in f:
        line = line.decode().strip()
        if not line or line.startswith("#"):
            continue

        try:
            [opt, val] = line.split("=")
            if val =="n":
                continue
            CFGS.add(opt)
        except:
            pass

print("Enabled config options:")
print(CFGS & REQS)

print("Missing config options:")
print(REQS - CFGS)
}}

==== Installing LXD ====
Installing LXD is pretty straight forward as the ebuild exists in our portage tree. I would recommend putting /var on btrfs or zfs (or at least /var/lib/lxd) as LXD can take advantage of these COW filesytems. LXD doesn’t need any configuration to use btrfs, you just need to make sure that /var/lib/lxd is stored on a btrfs filesystem and LXD will automatically make use of it for you. You can use any other filesystem, but be advised LXD can take great advantage of btrfs or ZFS, be it for snapshots, clones, quotas and more. If you want to test it on your current filesystem consider creating a loop device that you format with btrfs and use that as your /var/lib/lxd device.

There are couple of major versions of LXD/LXC.
* LXC
** ''LXC 1.0 (LXC upstream strongly recommends 1.0 users to upgrade to the 2.0 LTS release. Not supported by Funtoo.)'' 
** '''LXC 2.0.x LTS (supported until June 2021)''' - latest version 2.0.9
** LXC 2.x (supported for a year from release announcement on 5th of September 2017 - so until September 2018) - latest version 2.1.1
* LXD
** '''LXD 2.0.x LTS (supported until June 2021)''' - latest 2.0.11
** LXD 2.x - latest 2.21
* LXCFS
** '''LXCFS 2.0.x LTS (supported until June 2021)''' - latest 2.0.8

{{warning|LXD downgrade from "current" to "LTS" is not supported, but can still be done with lots of manual work.}}

Install LXD by:
{{console|body=
###i## emerge -av lxd
}}

{{note|You probably want to install also lxcfs, apparmor, ebtables as these are used by lxd and are not dependencies in the ebuild, yet.}}