RHCE Course Summary

DNS, SSH experiment
Requirements:
1. Resolve the host ip address of www.qq.com through dns separation technology, realize the resolution of the internal network host to the internal network service host, and the external network host to resolveTo the external network host;
2. Configure A and B hosts to achieve password-free login;

Task 1 (Note: Only two virtual machines are used in this experiment, and A is used as the dns and test host)
1. Mount and install
Rename:
[[email protected] ~]# hostnameA
[[email protected] ~]# bash
[[email protected] ~]#

[[email protected] ~]# mount /dev/sr0 /mnt
[[email protected] ~]# yum install bind -y

Close the firewall, selinux
[[email protected] ~]# systemctl stop firewalld
[[email protected] ~]# setenforce 0
[[email protected] ~]# systemctl start named

2. Modify the file
[[email protected] ~]# vim /etc/named.conf

Modify the corresponding file of the intranet:
[[email protected] ~]# vim /var/named/named.qq.com

Modify the corresponding file on the external network:
[[email protected] ~]# vim /var/named/named1.qq.com

Modify the corresponding resolution ip of www:

Reboot:
[[email protected] ~]# systemctl restart named

Test:
On the 192.168.43.128 intranet host:
The result of parsing the intranet ip:

On 192.168.43.130 external network host
Parse the result through the external network ip:

Success

Task 2,
A is the client, B is the server

Generate an asymmetric key on A;

Keep pressing Enter without modifying the path or setting the password information:

View:

B:
Create a .ssh directory for receiving public keys

A: Send the public key file to B

B:

Test:
A:

The experiment was successful