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 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.service8. 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 any other mappings, such as DNS or /etc/hosts based mappings take precedence. Here's 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 systemd1, systemd-machined.service8, nss-resolve8, nss-myhostname8, nsswitch.conf5, getent1