Learning nfs/NIS 2nd-chap2 introduction to Directory Service

1. gethostbyname -- if the hostname is specified, IP address is returned. Gethostbyaddr -- returns the hostname for the given IP address.

2. Modify hosts: Files nis dns in/etc/nsswitch. conf to define the behavior of gethostbyname and gethostbyaddr. They will first find the hosts file, then NIS, and finally DNS.

3. about NIS +. Sun developed NIs in the middle of the 1980 s. In 1992, Sun developed NIS +. In comparison with NIS, NIS + has enhanced security. Therefore, in many directory services, if the security requirements are not high, Nis and DNS can be considered. If the security requirements are high, NIS + becomes the choice, if the requirement is the highest-use LDAP, which is the most secure and functional, but is also the most difficult to manage. (LDAP is developed based on an X.500, and X.500 is a standard developed by ISO)