11. Remote Management Service Standard Configuration

Remote Management Services for CentOS7#

Experimental Environment:#

CentOS7: 192.168.0.1
Windows7: 192.168.0.2

Experimental Steps#

Set up the network environment (connect two hosts to vmnet1).
Set IP addresses.
To ensure smooth experimentation: Disable the firewall and SELinux on CentOS7.
Test connectivity using ping (Windows client pinging CentOS7 server).
Install telnet-server software on CentOS7.
Start the telnet service: systemctl start telnet.socket.
Remote connect from Windows7 client (using built-in telnet tool or third-party telnet tool).
Log in to CentOS using an account (for security reasons: by default, root can only log in locally and not remotely).

Solution: Use a regular user account to log in and then switch to root using the su command:

Method to add a regular user:
```
user add mike (create mike user)
passwd mike 123 (set mike user password)
```
Method for remote login from Windows:
```
telnet 192.168.0.1
After successful login:
su root
Enter root user password
```

SecureCRT

putty

How to log in to telnet using the root account (not recommended)#

Telnet transmits data in plain text, which is insecure.

Edit: Add to /etc/securetty:

pts/0 (allow one thread to connect simultaneously)
pts/1 (allow two threads to connect simultaneously)

Connecting to CentOS7 using ssh#

The SSH server starts with the launch of CentOS and is a daemon process.

We can check if the SSH service is running using the following command:

systemctl status sshd.service

We can also use the following commands to start, stop, and restart the ssh service:

systemctl start sshd.service         # Start ssh service

systemctl restart sshd.service      # Restart ssh service

systemctl enable sshd.service      # Enable ssh service at startup

systemctl stop sshd.service　　　# Stop ssh service

SSH connections use encrypted transmission and are more recommended than telnet for connecting.

ssh -p22 [email protected]

-p is optional, if not specified, the default is -p22, 22 is the default port for ssh connections.

root is the username.

@ is the connector between the username and the hostname or IP address.

192.168.0.1 is the hostname or IP address of the connection.