NIS Utilities in Font

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Here are useful some tools you can use to find out more about NIS in a network, such as which domain it currently runs on and specific values in the domain s map files.
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The ypwhich command will return the name of the NIS server of an NIS domain. If you run it without any arguments, it will show the NIS client s NIS server for the domain it is currently affiliated with. Here is the syntax for the ypwhich command: ypwhich given_options where given_options are the options you want to supply on ypwhich. For example, to see the translation of the maps table, you can run ypwhich x. Running ypwhich in either NIS master or NIS client will return the IP address of the NIS server of the toysdomain. In our example, it will return 192.168.1.104. It will return the NIS master s hostname if it has an entry on your DNS.
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CHAPTER 16 DIRECTORY SERVICES
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If there are other NIS domains in your network, you can use the d flag to find the master of that domain. For example, if there is an NIS domain called toystatues in your network, running ypwhich d toystatues will return its NIS server name.
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The ypcat command will print the values of all keys from the NIS database. Here is its format: ypcat given_options given_mapname where given_options are the options you want to use with ypcat and given_mapname may be a map name or a map nickname. Earlier, you ran the command ypcat passwd,where the map is the nickname of the actual map file, passwd.byname, which showed you all the keys in the passwd map. You can use ypcat to display the values of the other database maps as needed.
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The ypmatch command can be used to search for a certain map value using its key. The syntax of the ypmatch command is ypmatch key mapname where key is the selected key in the chosen map table given by mapname for the value to be searched. To further illustrate the key-value pair, take a look at this sample entry of the passwd map file bakie:$1$VeB.1qOW$DN.fnliYrV7vTr0hpC3v..:503:503::/home/bakie:/bin/bash The underlined part is a key, while everything that follows is the value of the key. The ypmatch command will show whatever value a key holds in your search. As an exercise, assume you want to find the value of the key bakie in the group map. To do that, you enter this: ypmatch bakie group The ypmatch command will return the value contained in the bakie key of the group map if one exists. In our setup, it should return this: bakie:!:503:
yppasswd
The yppasswd command lets you change the NIS password of the target user. This will change both the system user s password and the one contained in the NIS database map, passwd. Here is the syntax for the yppasswd command: yppasswd target_user where target_user is the user, within this NIS domain, whose password to change. When you run this command, you do not have to manually update the map file as discussed earlier, because yppasswd will do it for you. Before you run this command, make sure you run its RPC server process with the same name to accept NIS password changes. To do so, enter service yppasswdd start.
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CHAPTER 16 DIRECTORY SERVICES
NIS with NFS
A very good use for NIS is to pair it with NFS. By having an NFS server sharing remote directories and NIS to provide uniform authentication and network information, we can have a very transparent Linux network. We will combine the two servers in this exercise, so it is best that you read about NFS on 14 before diving in here. In this exercise, we will let our NIS server on toysdomain run an NFS server and have it share the /home directory. The client will mount the remote /home directory and let it bind to the server. Note that our client initially does not have the bakie user. After this exercise, you will see that even if the user is virtually nonexistent to the NIS client, it will appear to be there because of the bakie user s mounted home directory (/home/bakie) and having a single authentication with NIS. We will continue with our fictional network setup where the IP address of the NIS and NFS server is 192.168.1.104 and the NIS client, 192.168.1.100.
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