What is written in this memo

CentOS Stream8 installation flow
How to deal with the problem that the installation screen is cut off
How to install VirtualBox Guest Additions
How to disable IPv6: For kernel boot option
How to disable IPv6: for sysctl
How to disable virbr0

It's almost the same as installing CentOS8, It may be useful to know that it is almost the same. Kana ww

Installation conditions

Setting items	Settings in this memo	Remarks
Software selection	Server (using GUI)	initial value
hostname	cent8st.example.co.jp
root password		Let's think about a suitable one
General user ID	user01
General user password
Installation destination PC	VirtualBox virtual machine	Introduced VBoxGuestAdditions
Japanese input environment	Japanese input environmentを設定
IPv6	Invalidation
virtbr0	Invalidation	仮想ブリッジ、不要ならInvalidation

Installation

Start installation With Install CentOS Stream 8-stream selected, press Tab to display the menu Add vga = 773 to the end and press Enter to launch the installer.

At this point, the system is in English keyboard mode. If you are using a Japanese keyboard, press "^" to enter "=". Reference: GRUB VGA Modes

Language selection Select the language you want to use. I chose Japanese.
Installation overview Make the following settings before clicking Start Installation.

Time and date: Specify time zone
Installation: Disk and partition if necessary
KDUMP: Disable, if you have a home server, even if you get KDUMP, it will not be analyzed, right?
Network and host name (let's set the host name even with DHCP)
root password: Set the password for the root account.
Create User: Create a general user.
When CentOS 8 was installed before, ** root password ** and ** create user ** were on separate screens. CentOS8 itself may have changed, but this is the only change I noticed.

Select the time and date and select the region I chose Asia / Tokyo
Set the installation disk, partition if necessary I accepted the standard disc selection.
Disable KDUMP Uncheck Enable kdump If you need it, you can accept the standard settings without unchecking it.
Network and host name

Host name setting
Turn Ethernet on (If you want to fix the IP address, go to "Settings"-> "IPv4 Settings".)

Set root password
Create user Specify the information of the user to create I'm working with the user I created here by checking "Make this user an administrator".
Check the installation overview After completing the settings, click ** Start Installation ** to start the installation.
Reboot Wait for the installation to finish before rebooting.
Accept the license
If you can confirm and agree to the license Check I accept the license.
Initial setup completed
Login
Settings for first login 1: Language selection
Setting at first login 2: Input method selection
Settings for first login 3: Privacy settings
Settings for first login 4: Connecting to an online account (optional, I'm skipping)
Settings for first login 5: Completed

VirtualBox Guest Additons installation

Add required packages Install the development environment for VirtualBox Guest Additions installation At first, the installation of VBoxGuestAdditions failed, so when I looked at setup.log, it requested the following module, so It is installed together with the development environment. libelf-dev lebelf-devel or elfutils-libelf-devel

[user01@centos8st ~]$ sudo dnf group install -y "Development Tools"
[user01@centos8st ~]$ sudo dnf install -y elfutils-libelf-devel

Implementation of update In most cases, there will be a gap between the additionally installed kernel-header and the running kernel. Let's update and match the version of the package.

[user01@centos8st ~]$ sudo dnf clean all
[user01@centos8st ~]$ sudo dnf check-update
[user01@centos8st ~]$ sudo dnf -y upgrade
[user01@centos8st ~]$ shutdown -r now

Installing VirtualBox Guest Additions 1 Insert Guest Additions CD Image Select "Insert Guest Addtions CD image"
Installing VirtualBox Guest Additions 2 When the VBox_GAs_XXX screen appears, click Execute.
Installing VirtualBox Guest Additions 3 If you are required to authenticate, please enter your credentials.
Installing VirtualBox Guest Additions 4 When the installation is complete, restart the OS and you're done.

[user01@centos8st ~] sudo shutdown -r now

IP grant status immediately after installation

When using it as a server that does not use a virtual environment, IPv6 and virbr0 are an obstacle. Disable IPv6 and virbr in the next item.

[user01@centos8st ~]$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 08:00:27:9f:3f:92 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.122/24 brd 192.168.1.255 scope global dynamic noprefixroute enp0s3
       valid_lft 13605sec preferred_lft 13605sec
    inet6 240b:11:aae2:6200:5678:5987:aded:cf0f/64 scope global dynamic noprefixroute 
       valid_lft 13973sec preferred_lft 12173sec
    inet6 fe80::4a7c:a888:c035:7231/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 52:54:00:1b:5f:80 brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
       valid_lft forever preferred_lft forever
4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel master virbr0 state DOWN group default qlen 1000
    link/ether 52:54:00:1b:5f:80 brd ff:ff:ff:ff:ff:ff
[user01@centos8st ~]$

IPv6 disabled

Method 1: Disable with Kernel Boot Option (recommended)

Edit configuration file Add "ipv6.disable = 1" to the end of the GRUB_CMDLINE_LINUX line.

[user01@centos8st ~]$ sudo vi /etc/default/grub 
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="resume=/dev/mapper/cs-swap rd.lvm.lv=cs/root rd.lvm.lv=cs/swap rhgb quiet ipv6.disable=1"
GRUB_DISABLE_RECOVERY="true"
GRUB_ENABLE_BLSCFG=true
[user01@centos8st ~]$

Reflect Grub settings Execute grub2-mkconfig by specifying the link destination of grub2.cfg confirmed by ls. If there are two links, also execute grub2-mkconfig twice. Then, restart the system after execution.

[user01@centos8st ~]$ ls -lh /etc/grub*.cfg
lrwxrwxrwx.1 root root 22 September 9 04:00 /etc/grub2.cfg -> ../boot/grub2/grub.cfg
[user01@centos8st ~]$ sudo grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
done
[user01@centos8st ~]$ shutdown -r now

Method 2: Disable with sysctl

IPv6 disabling settings in sysctl.conf

[user01@centos8st ~]$ sudo vi /etc/sysctl.d/ipv6.conf
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
[user01@centos8st ~]$ sudo sysctl --load /etc/sysctl.d/ipv6.conf

IPv6 disable setting in NetworkManager If you are using NetworkManager If you restart the OS or restart nic with a command, IPv6 will be enabled. Let's set NetworkManager not to enable IPv6. (Replace enp0s3 with the NIC name of your server)

[user01@centos8st ~]$ nmcli connection show enp0s3 |grep ipv6.method
ipv6.method:                            auto
[user01@centos8st ~]$ sudo nmcli connection modify enp0s3 ipv6.method ignore
[user01@centos8st ~]$ nmcli connection show enp0s3 |grep ipv6.method
ipv6.method:                            ignore
[user01@centos8st ~]$

Common setting

This setting is common regardless of whether IPv6 is stopped by either sysctl/kernel boot option.

Remove IPv6 entry from/etc/hosts Delete or comment out the IPv6 entry.

[user01@centos8st ~]$ sudo vi /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
##::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
[user01@centos8st ~]$

Remove IPv6 entry from/etc/netconfig Suppress error messages. Delete or comment out the udp6/tcp6 line.

[user01@centos8st ~]$ sudo vi /etc/netconfig
#
# The network configuration file. This file is currently only used in
# conjunction with the TI-RPC code in the libtirpc library.
#
# Entries consist of:
#
#       <network_id> <semantics> <flags> <protofamily> <protoname> \
#               <device> <nametoaddr_libs>
#
# The <device> and <nametoaddr_libs> fields are always empty in this
# implementation.
#
udp        tpi_clts      v     inet     udp     -       -
tcp        tpi_cots_ord  v     inet     tcp     -       -
##udp6       tpi_clts      v     inet6    udp     -       -
##tcp6       tpi_cots_ord  v     inet6    tcp     -       -
rawip      tpi_raw       -     inet      -      -       -
local      tpi_cots_ord  -     loopback  -      -       -
unix       tpi_cots_ord  -     loopback  -      -       -
[user01@centos8st ~]$

Disable virbr

If you do not build a virtual environment such as KVM, it is unnecessary and will be stopped.

[user01@centos8st ~]$ systemctl disable libvirtd
[user01@centos8st ~]$ sudo shutdown -r now

reference

CentOS 8.0.1905 documentation
Another way to eliminate screen breaks is to set the virtual machine's graphics controller to VBoxSVGA.

Install CentOS Stream8 in VirtualBox