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RedHat/TemplateVM.

1- Installation	2- Network	3- Firewall	4- Selinux
5- Logs	6- Certificates	7- Mail	8- PassphraseSSH
9- Sudo	10- GnomeShell	11- CloneVM	12- Volume
13- Troubleshoot

1. Installation Red Hat 9.

1.1 Prerequisites.

• Good knowledge of the Redhat packages.
• Have a Red Hat developer account.
• VMware vSphere Hypervisor.
• Iso : rhel-9.5-x86_64-boot.iso.
• Guest OS Version: Red HAT 9 Enterprise 64b.
• Boot parameter: EFI.
• Unlock Activate or not UEFI secure starter for this VM .

Name : TemplateVM.
40G dynamic disk.
RAM : 4G.

1.2 Disk partition.

• System - Installation destination - Storage destination - Choose custom.
• Start the partitioning from top to bottom of the table.
• Choose for the LVM type: LVM (IMPORTANT).
• (*)Change rhel volume group to "vgl0" -Raid Level None- Size policy Automatic.
• (**)To end with "/home", change the Size policy of vgl0 to as large as possible.
• Click on “Done” to finish.

Mounting point	Desired Capacity	Device Type	File System	Volume Group	Label	Name
/boot/efi	100M	standard	efi system		boot-efi
/boot	750M	standard	Ext4		boot
swap	4G	standard	swap		swap
(*)/	10G	LVM	EXT4	vgl0	root	root
/usr/local	2G	LVM	EXT4	vgl0	usrlocal	usrlocal
/opt	2G	LVM	EXT4	vgl0	opt	opt
/var	4G	LVM	EXT4	vgl0	var	var
/var/log	2G	LVM	EXT4	vgl0	varlog	varlog
(**)/home	2G	LVM	EXT4	vgl0	home	home

1.3 Create User.

The user is not an administrator.

1.4 First start.

You should get what is shown below.
If it is not good, you will have to start the installation again.

pvdisplay  
 --- Physical volume ---  
  PV Name               /dev/sda4  
  VG Name               vgl0  
  PV Size               <35.17 GiB / not usable 4.00 MiB  
  Allocatable           yes   
  
vgdisplay vgl0  
 Alloc PE / Size       5632 / 22.00 GiB  
 Free  PE / Size      3370 / 13.16 GiB  

You only have 13G available to increase your logical volumes.

1.5 Configuration Red Hat 9.

1.5.1 Installation of default packages.

There is no sudo. You are root.
subscription-manager repos --enable "rhel-9-for-x86_64-supplementary-rpms" --enable "codeready-builder-for-rhel-9-x86_64-rpms" --enable "rhel-9-for-x86_64-highavailability-rpms"
dnf install https://dl.fedoraproject.org/pub/epel/epel-release-latest-9.noarch.rpm
dnf update
dnf install net-tools nmap telnet vim bind-utils rsyslog-logrotate pinentry wget

1.5.2 Delete console messages.

dmesg –D no console messages.
dmesg –E messages on the console.
Suppress console messages on startup.
vi /etc/sysctl.conf

#Add the line  
kernel.printk = 2 4 1 7  

Activate immediately sysctl -p otherwise reboot.

1.5.3 Allow SSH Access.

vi /etc/ssh/sshd_config

# add or change  
#to forbid root  
PermitRootLogin no  
#allow only that for you  
AllowUsers <your username>  

systemctl restart sshd

If your network has a DHCP server and your virtual machine has recovered an IP address.
Now.

• Note the IP Virtual Machine address with 'ifconfig'.
• restart the virtual machine.
• Connect from a SSH connection to your remote computer.

1.5.4 Configuring the NTP Client.

vi /etc/chrony.conf
This example is for France.

#Change the line 'pool  2.almalinux.pool.ntp.org    iburst':  
#Example from the France.  
pool   fr.pool.ntp.org    iburst  
#add to the end:  
#listen only host  
allow 127.0.0.0/8  

systemctl restart chronyd

1.5.4.1 Check Time Zone.

timedatectl
Example: Changing Time Zone.
timedatectl list-timezones 
timedatectl set-timezone Australia/Sydney