2022/7/10RHCSA

1、 stay VMware How to create virtual machines and install linux operating system

https://blog.csdn.net/weixin_57949883/article/details/125708510?spm=1001.2014.3001.5501
2、 Change the hostname to server.local
Modify the temporary host name

Refresh the connection

permanent , What is modified is the file content . restart linux The system still takes effect after .

3、 Change the network connection mode of virtual machine to host only mode 、nat Pattern 、 Bridge mode and get ip Address using ssh Connect remotely through different users
4、 After the remote connection is successful , Summarize which network mode can access the Internet （ have access to ping Command test ） And look at root The difference between the home directory of users and ordinary users
Set bridge mode ：


Bridge mode is to communicate between host network card and virtual network card by virtual bridge . It's similar to virtualizing a physical host as a switch , All virtual machines with bridging settings are connected to an interface of this switch , The physical host is also plugged into the switch , So all the network cards under the bridge are in switching mode , Mutual access without interference . In bridge mode , virtual machine IP The address needs to be in the same network segment as the host , If networking is needed , Then the gateway and DNS It needs to be consistent with the host network card . therefore , All virtual machines in bridge mode are in the same network segment as the host .
The host address ：

Virtual machine address ：

And you can connect remotely through users ：

virtual machine ping gateway ：

virtual machine ping host ：
virtual machine ping Extranet ：
host ping virtual machine ：

Set to host mode ：
Only host mode can be regarded as NAT Patterns remove the virtual NAT equipment , And then use VMware Network Adapter VMnet1 Virtual network card connection VMnet1 Virtual switch to communicate with virtual machine ,Host-Only Mode separates the virtual machine from the Internet , Make virtual machine an independent system , Only communicate with the host .
The host address ：

Virtual machine address ：
The user's remote connection succeeded ：

virtual machine ping host ：

host ping virtual machine ：

virtual machine ping The network is ping It doesn't work , Because of the host VMnet1 The network card has no gateway and DNS The server .

Set to NAT Pattern
stay NAT In the pattern , Host network card and virtual directly NAT Equipment connection , And then virtual NAT Devices and virtual DHCP The servers are connected together in a virtual switch VMnet8 On , In this way, virtual machine networking is realized .VMnet8 Network card is to realize the communication between host and virtual machine .
so NAT In this mode, the host is more like a virtual machine " Router ", adopt VMnet8 The virtual network card distributes addresses to virtual machines . Therefore, the virtual machine and the host are no longer under the same network segment , It can be understood that the host is a virtual machine " The superior ", This is why the bridge mode does not VMnet0 This virtual network card , Because the virtual machine and host in bridge mode are " equality " Of , Share the same router . So in VMnet8 The network segment on the network card can be set by yourself .

The address obtained by the virtual machine ：

Users can also log in remotely

And the host can ping Through virtual machines , Virtual machines can also ping Communication host , Virtual machines can also access the Internet .
virtual machine ping host ：

virtual machine ping gateway

virtual machine ping Extranet

host ping virtual machine

therefore , Bridge mode and NAT The mode is that you can surf the Internet , The host mode cannot access the Internet , Because the host network card in the host mode has no gateway address and DNS Server address . But all three modes can use users to connect remotely （ The host mode must be in the same LAN ）.
root User home directory ：

Home directory of ordinary users ：

5、 Crack the code
Restart the system , Press e key

find linux This line , After the space at the end Input rd.break

Press Ctrl+X

Mount in read-write mode /sysroot
Get into /sysroot Subsystem and change the password and force the context of the file system to be reset


Exit twice and wait for the system to restart .