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lxc_idmap_v2

Little python utility to provide the text needed for /etc/lxc/#ctid.conf, /etc/subuid, and /etc/subgid to map user and group ids mappings for unprivileged lxcs.

credit|thanks: much of the code taken/adapted from ddimick's proxmox-lxc-idmapper

As used below:

  • lxc_uid = container user id
  • lxc_gid = container group id
  • host_uid = host (proxmox) user id
  • host_gid = host (proxmox) group id

Syntax

usage: lxc_idmap_v2.py [-h] [-u UID[=h_UID]] [-g GID[=h_GID]] [-ug UID[:GID][=[h_UID][:h_GID]]]


-u, --user = lxc_UID

lxc_UID

Ex. -u 1000 1234 -g 1000 --> invalid | -u 1000 -u 1234 -g 1000 --> valid

Note: if you use the _old version of the code, the first example is valid syntax (as it allows positional arguments), but its behavior might not match expectations. The 1234 would not be interpreted as a second -u/--user arg, but instead as a positional arg and interpretted as 1234:1234=1234:1234 (old syntax) or the equivalent -u 1234 -g 1234 or -ug 1234 (new syntax)

Note

All arguments can be used as many times as needed, but each argument must be preceded by the appropriate flag.


UID|GID Mappings (no flag args)

lxc_uid[:lxc_gid][=host_uid[:host_gid]] (no flag)

  • Only the container user's id <lxc_uid> is required.
  • if no container group id <lxc_gid> then it will be set to the user id
    • As such: ./lxc_idmapper 1000 is equivalent to ./lxc_idmapper 1000:1000
  • if no host user id is provided, it will be set to the container user id.
    • As such: ./lxc_idmapper 1000 is equivalent to ./lxc_idmapper 1000=1000
  • if no host group id is provided, it will be set to the container group id.
    • As such: ./lxc_idmapper 1000:1234 is equivalent to ./lxc_idmapper 1000:1234=1000:1234

- Separate multiple id mappings with a ``

Flagged Arguments


Sometimes this behavior of creating a group id mapping for every user id mapping (or vice versa) is undesired. Utilize the -u/--user and -g/--group to limit mapping to only the user or group identified.

-u | --user

Usage: -u lxc_id or --user lxc_id=host_id Similar to above, in that only the container id is required. If not provided, the host id will default to the same value of the container id.

-g | --group

Usage: -g lxc_id or --group lxc_id=host_id Similar to above, in that only the container id is required. If not provided, the host id will default to the same value of the container id.


Example Usage and Output

./lxc_idmap_v2.py 1000 # equivalent to ./lxc_idmap_v2 1000:1000 or ./lxc_idmap_v2 1000:1000=1000:1000

# Add to /etc/pve/lxc/<container_id>.conf:
lxc.idmap: u 0 100000 1000
lxc.idmap: u 1000  1000 1
lxc.idmap: u 1001 101001  64535
lxc.idmap: g 0 100000 1000
lxc.idmap: g 1000  1000 1
lxc.idmap: g 1001 101001  64535

# Add to /etc/subuid:
root:1000:1

# Add to /etc/subgid:
root:1000:1
./lxc_idmap_v2.py 1000:9876

# Add to /etc/pve/lxc/<container_id>.conf:
lxc.idmap: u 0 100000 1000
lxc.idmap: u 1000  1000 1
lxc.idmap: u 1001 101001  64535
lxc.idmap: g 0 100000 9876
lxc.idmap: g 9876  9876 1
lxc.idmap: g 9877 109877  55659

# Add to /etc/subuid:
root:1000:1

# Add to /etc/subgid:
root:9876:1
./lxc_idmap_v2.py 1000:567=990:213

# Add to /etc/pve/lxc/<container_id>.conf:
lxc.idmap: u 0 100000 1000
lxc.idmap: u 1000  990 1
lxc.idmap: u 1001 101001  64535
lxc.idmap: g 0 100000 567
lxc.idmap: g 567  213 1
lxc.idmap: g 568 100568  64968

# Add to /etc/subuid:
root:990:1

# Add to /etc/subgid:
root:213:1
/lxc_idmap_v2.py 564:564=812 -u 444=1230 -g 909 -g 7777

# Add to /etc/pve/lxc/<container_id>.conf:
lxc.idmap: u 0 100000 444
lxc.idmap: u 444  1230 1
lxc.idmap: u 445  100445 119
lxc.idmap: u 564  812 1
lxc.idmap: u 565 100565  64971
lxc.idmap: g 0 100000 564
lxc.idmap: g 564  564 1
lxc.idmap: g 565  100565 344
lxc.idmap: g 909  909 1
lxc.idmap: g 910  100910 6867
lxc.idmap: g 7777  7777 1
lxc.idmap: g 7778 107778  57758

# Add to /etc/subuid:
root:1230:1
root:812:1

# Add to /etc/subgid:
root:564:1
root:909:1
root:7777:1