nss-mymachines

systemd
Developer Lennart Poettering lennart@poettering.net
nss-mymachines 8
nss-mymachines libnss_mymachines.so.2 Provide hostname resolution for local container instances.

`libnss_mymachines.so.2`

## Description

`nss-mymachines` is a plug-in module for the GNU Name Service Switch (NSS) functionality of the GNU C Library (`glibc`), providing hostname resolution for the 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. This functionality only applies to containers using network namespacing.

The module also resolves user and group IDs used by containers to user and group names indicating the container name, and back. This functionality only applies to containers using user namespacing.

To activate the NSS module, add `mymachines` to the lines starting with `hosts:`, `passwd:` and `group:` in `/etc/nsswitch.conf`.

It is recommended to place `mymachines` after the `files` or `compat` entry of the `/etc/nsswitch.conf` lines to make sure that its mappings are preferred over other resolvers such as DNS, but so that `/etc/hosts`, `/etc/passwd` and `/etc/group` based mappings take precedence.

## Example

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

    passwd:         compat mymachines systemd
    group:          compat mymachines systemd
    shadow:         compat

    hosts:          files mymachines resolve [!UNAVAIL=return] dns myhostname
    networks:       files

    protocols:      db files
    services:       db files
    ethers:         db files
    rpc:            db files

    netgroup:       nis

## See Also

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