nss-mymachines, libnss_mymachines.so.2

libnss_mymachines.so.2

nss-mymachines is a plugin for the GNU Name Service Switch (NSS) functionality of the GNU C Library (glibc), providing hostname resolution for container names of containers running locally that are registered with systemd-machined.service(8). The container names are resolved to the IP addresses of the specific container, ordered by their scope.

The module also resolves user IDs used by containers to user names indicating the container name, and back.

To activate the NSS modules, "mymachines" has to be added to the lines starting with "hosts:", "passwd:" and "group:" in /etc/nsswitch.conf.

It is recommended to place "mymachines" near the end of the nsswitch.conf lines to make sure that its mappings are only used as fallback, and that any other mappings, such as DNS or /etc/hosts based mappings, take precedence.

Here is an example /etc/nsswitch.conf file that enables mymachines correctly:

passwd:         compat mymachines
group:          compat mymachines
shadow:         compat
hosts:          files resolve mymachines myhostname
networks:       files
protocols:      db files
services:       db files
ethers:         db files
rpc:            db files
netgroup:       nis

systemd(1), systemd-machined.service(8), nss-resolve(8), nss-myhostname(8), nsswitch.conf(5), getent(1)