Container Linux ships with the System Security Services Daemon, allowing integration between Container Linux and enterprise authentication services.
Edit /etc/sssd/sssd.conf. This configuration file is fully documented here. For example, to configure SSSD to use an IPA server called ipa.example.com, sssd.conf should read:
config_file_version = 2 services = nss, pam domains = LDAP [nss] [pam] [domain/LDAP] id_provider = ldap auth_provider = ldap ldap_schema = ipa ldap_uri = ldap://ipa.example.com
sudo systemctl start sssd
sudo systemctl enable sssd