Hello, Just find a issue about container cifs kerberos credential. Create two containers. One is samba server. The other is client. Try to mount cifs share in container client. But it's failed for "Required key not available". Finally found that the container client use host kerberos credential instead of container kerberos. More info please check: https://bugzilla.kernel.org/show_bug.cgi?id=212145 By the way, host and two container are 5.12.0-rc1+. Thanks. -- Best regards! XiaoLi Feng 冯小丽