Detailed process of configuring NIS in Centos7

principle

NIS (Network Information Service)
In an environment with multiple Linux servers, and one Linux server has many accounts that may be the same, it is difficult for administrators to manage. The main function of NIS is to provide centralized management of system information such as the host account system.
When the NIS client needs to verify user login information, it sends a query request to the NIS server. When an NIS server in the system provides services to multiple NIS clients, any NIS client in the system will be authenticated by the NIS server, thus realizing the centralized management of user accounts.

Network environment preparation

Pre-installation preparation

1. Stop the firewall

systemctl stop firewalld

2. Disable firewall startup

systemctl disable firewalld.service

2. Modify selinux

vi /etc/selinux/config

Change SELINUX=enforcing to: SELINUX=disabled
, and execute setenforce 0 to make it take effect immediately. Of course, you can also restart the machine

NIS Server Operations

1. Install the software package

yum -y install ypserv ypbind yp-tools rpcbind

2. Set NIS network name

vi /etc/sysconfig/network

Add a line NISDOMAIN=nisdomain to specify the domain name of the NIS server as nisdomain

3. Add automatic joining of NIS domain at startup

vi /etc/rc.d/rc.local

Add a line /bin/nisdomainname nisdomain in it

Note~~ You can use nisdomainname to view directly. If you find that the set domain name is not displayed, enter nisdomainname nisdomain again

4. Create domain users (groups)

useradd -s /bin/bash nisuser

And set the user password

passwd nisuser

Create a User Group

groupadd nisgroup

5. Set up permissions for main configuration files

vi /etc/ypserv.conf

Add the following three lines to restrict the servers that can only join the 13.10 network segment

6. Add NIS client information in the NIS domain server

vi /etc/hosts

Add the following two lines in it:
13.10.29.2 node292
13.10.29.3 node293

7. Start NIS service

systemctl start rpcbind
systemctl start yppasswdd
systemctl start ypserv

8. Initialize the database

/usr/lib64/yp/ypinit -m

Then execute "ctrl+D" and enter y

Note: If you change the NIS server configuration file during this period, you need to reinitialize the database.

9. After initializing the database, you need to restart the service

systemctl start rpcbind    
systemctl start yppasswdd 
systemctl start ypserv

10. Set the service to start automatically at boot

systemctl enable rpcbind
systemctl enable yppasswdd
systemctl enable ypserv

NIS Client Operations

1. Install the software package

yum -y install ypbind yp-tools rpcbind

2. Add NIS domain to the network

vi /etc/sysconfig/network

Add a line NISDOMAIN=nisdomain

3. Set the system to automatically join the NIS domain at startup

vi /etc/rc.d/rc.local

Add /bin/nisdomainname nisdomain

Also note that you can use nisdomainname to view it directly. If you find that the set domain name is not displayed, enter nisdomainname nisdomain again.

4. Add NIS server information in the NIS client

vi /etc/hosts

13.10.29.3 node293
13.10.29.2 node292

5. To configure NIS using the graphical interface, enter:

authconfig-tui 

6. Start the service

systemctl start rpcbind
systemctl start ypbind

At this point, you can verify whether the deployment is successful by entering yptest on the client. If you can see the user on the nis server, congratulations, the deployment is successful.

The above NIS environment has been deployed! !

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