Note : The list required to install and configure

 Checklist to activate hosting server (php, laravel and sql server)

1. Install Virtualmin
2. Upgrade PHP8.1 or latest
   
3. To connect with Oracle DB - install OCI8
4. To connect with MSSQL - install ODBC, sqlsrv, pdo_sqlsrv
5. Install Laravel - install composer, npm, node

# Previous OS Centos 7 and below - install with latest OpenSSL 1.0.2k-fips
# Latest OS Rocky9.1 and above - install with latest OpenSSL 3.0

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Letsencrypt : Secure Apache on Ubuntu 20.04

Let’s Encrypt is a Certificate Authority (CA) that facilitates obtaining and installing free TLS/SSL certificates, thereby enabling encrypted HTTPS on web servers.

1. Installing Certbot

#sudo apt install certbot python3-certbot-apache 

2.Checking your Apache Virtual Host Configuration

#sudo vi /etc/apache2/sites-available/your_domain.conf
#sudo apache2ctl configtest
#sudo systemctl reload apache2

3.Allowing HTTPS Through the Firewall

#sudo ufw status
#sudo ufw allow 'Apache Full'
#sudo ufw delete allow 'Apache'

4.Obtaining an SSL Certificate

#sudo certbot --apache 

5.Verifying Certbot Auto-Renewal

#sudo systemctl status certbot.timer 

- To test the renewal process
#sudo certbot renew --dry-run

source: 

- https://www.digitalocean.com/community/tutorials/how-to-secure-apache-with-let-s-encrypt-on-ubuntu-20-04

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Centos 7 : Reset root password

The steps:

1. During boot menu, press (e) to edit existing kernel

2. Scroll down and find the line with (ro). Change (ro) with rw init=/sysroot/bin/sh. Ctrl-x to start

3. In emergency mode. Type #chroot /sysroot

4. Change the root password. Type #passwd root

5. Update the SELinux. Type #touch / .autorelabel

6. Exit and Reboot

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SSL : RSA server certificate CommonName (CN) `abc.com.my' does NOT match server name!?

Issue : 
 
[warn] RSA server certificate CommonName (CN) `abc.com.my' does NOT match server name!?

Resolve:

• Edit Apace SSL file : /etc/httpd/conf.d/ssl.conf 
• Change line # SSL Engine Switch from ON to OFF - SSLEngine off

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SSL : Disable SSL on Webmin

1. Edit /etc/webmin/miniserv.conf
2. Change value of "ssl" entry from 1 to  0

• ssl=1 (enable)
• ssl=0 (disable)

3. Restart webmin services # /etc/init.d/webmin restart
4. Restart apache services # /etc/init.d/httpd restart

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Ubuntu : Set Static IP Ubuntu 18.04

To configure a static IP address using the new NetPlan tool on Ubuntu server:

• Edit  #sudo nano /etc/netplan/50-cloud-init.yaml

• Add IP address, gateway and DNS

• Check IP Address

Source : https://websiteforstudents.com/configure-static-ip-addresses-on-ubuntu-18-04-beta

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Ubuntu : Enable root login

Solution 1. Edit #/etc/ssh/sshd_config

Change PermitRootLogin prohibit-password to yes

Solution 2. Run the command

#sudo sed -i 's/prohibit-password/yes/' /etc/ssh/sshd_config

3. Create password to root login

#passwd root


Source:

• https://linuxconfig.org/enable-ssh-root-login-on-ubuntu-16-04-xenial-xerus-linux-server-desktop

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Centos : Reset root password

source:

• https://community.spiceworks.com/how_to/4022-reset-root-password-on-centos-5-6
• http://www.tecmint.com/reset-forgotten-root-password-in-rhel-centos-and-fedora/

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Centos : How to fix boot failure due to incorrect fstab?

Solutions:

• at the grub prompt, hit a to append options
• add init=/bin/bash to the end of the kernel command line and press enter

The system will boot to a prompt like 'bash-3.2#' enter the following commands at the prompt

• mount -o remount,rw /
• vim /etc/fstab

Source:

• http://unix.stackexchange.com/questions/44027/how-to-fix-boot-failure-due-to-incorrect-fstab

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Centos : “Device eth0 does not seem to be present, delaying initialization” Error

source :

• http://www.unixmen.com/fix-device-eth0-seem-present-delaying-initialization-error/

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Ubuntu : Disable and remove AppArmor on Ubuntu based Linux distributions

http://www.techytalk.info/disable-and-remove-apparmor-on-ubuntu-based-linux-distributions/

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Ubuntu : Install PDF printer

Get cups-pdf installed. Open up a terminal session (or use Synaptic) and type the following:

sudo apt-get install cups-pdf

Finished install. Then  cups-PDF is  automatic load into your printer list.

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