Since we built the virtual machine environment, we will leave the procedure as a memorandum. This is the procedure for connecting to the network between the host OS and guest OS and connecting to the external network. It is assumed that VirtualBox is already installed.
Virtual machine: VirtualBox Host OS: Windows 10 Guest OS: CentOS7
Download from the following page. https://www.centos.org/download/
Old version then click here> Tree of the desired version of Archive Versions (7.6 this time)> http://archive.kernel.org/centos-vault/ >7.6.1810/ >isos>x 86 6 4>centos-7x86_64-DVD-1810.iso
There are various types of files such as DVD, Everything, and Minimal, but it seems that you should choose DVD. Please check the reference article for the differences between them.
The setting part of VirtualBox is almost the same as the following article, so you may want to take a look there.
Start VirtualBox and create and set up a virtual machine.
Name and operating system Enter your name. This time I chose CentOS.7. Type is Linux, version is RedHot (64-bit)
Memory size The memory is 2048. hard disk Check Create virtual hard disk.
File location The default is ok.
Face size About 80GB is required.
Be careful about memory and storage size. If the storage size is too small, you will stumble when installing the programs required for later environment construction.
It seems that the storage size can be changed later, but that didn't work and I had to recreate the virtual machine from scratch ...
Hard disk file type Select VDI.
Storage on the physical hard disk Select variable size.
Create a virtual machine with the above settings.
After creating the virtual machine, configure the settings.
Settings> General> Advanced A> Clipboard sharing and drag & drop bidirectional
Settings> Storage> Empty> Attributes> Disk icon to the right of the optical drive> Virtual optical disk file selection> Select and open the downloaded CentOS file> Save with OK
When you start the created virtual machine, the CentOS installer will start. Select Install CentOS 7 and enter. Select Japan in the language selection and continue. Moves to the installation summary screen.
Let's enable the GUI from the beginning. Click Select Software> Check Server (GUI Specification) and Development Tools> Done
Click Start Installation.
Create a ROOT password and user during installation. Click Reboot when the installation is complete.
You will be taken to the initial setup screen, so click LICENSING, check I accept the license agreement, and click Finish.
This completes the CentOS settings. Since the GUI is enabled, it takes a long time to install.
Next, set up the network. I got stuck here quite a bit.
There are two networks that need to be configured.
① Network connection between host OS and guest OS ② Connection to external network
Settings> Network> Adapter 1> Check Enable Network Adapter> Assign NAT> Adapter 2> Check Enable Network> Assign Host-Only Adapter> Name VirtualBox Host-Only Ethernet Adapter> ok
Set NAT for adapter 1 and host-only adapter for adapter 2.
With NAT, the guest OS (CentOS) can connect to the Internet via the host OS (Windows), and the host OS and guest OS can be connected with the host-only adapter.
By making these two settings, you can connect to the network ①②.
For more details, check out this article.
In the following, I wrote the GUI settings and NetworkManager settings, but only one of them should be sufficient. Please set it by either method you like. I think the GUI is easier to understand.
Applications> System Tools> Settings> Network ・ Enp0s3> Automatic connection ・ Check that other users can use it ・ Enp0s8> Automatic connection ・ Check that other users can use it -Network proxy> Manual check, HTTP proxy http: // proxy server address 8080
enp0s3: Default NAT connection enp0s8: Host-only adapter connection
The above GUI settings should be fine, but in some cases you may need to set them in NetworkManager, so I summarized it briefly as background knowledge.
Automatic -Use a DHCP server for IP address, gateway, and DNS settings ・ No need to set IP address, gateway, DNS Manual -Fix the IP address, gateway, and DNS -Enter each item of IP address, gateway, DNS by yourself
What is DHCP -Protocol for automatically making basic settings for communication in an IPv4 network -By using DHCP, each host can obtain the information required for various settings by inquiring to the DHCP server and can perform the settings automatically.
$ nmtui #Start NetworkManager Make the following settings for both Enp0s3 and enp0s8.
Automatically connect -Enable NIC when OS starts ·check
Available to all users ・ All users can use the NIC ·check
Since we will use a proxy server this time, we will set the proxy. There are three minimum registration requirements: ・ Bash ・ Yum ・ Git
~/.bashrc
PROXY=http://Proxy server address:8080
export http_proxy=$PROXY
export HTTP_PROXY=$PROXY
export https_proxy=$PROXY
export HTTPS_PROXY=$PROXY
/ets/yum.conf
PROXY=http://Proxy server address:8080
export http_proxy=$PROXY
export HTTP_PROXY=$PROXY
export https_proxy=$PROXY
export HTTPS_PROXY=$PROXY
~/.gitcinfig
[http "https://github.com" ]
proxy=http://Proxy server address:8080
You should now be able to connect to the external network from your virtual machine. Thank you for your hard work.