Apache HTTP Server Upgrade Script

upgrade-my-apache-http-server.sh

# Step 1 : Take backup of current apache2 installation directory
sudo cp -r /etc/apache2 /etc/apache2_bkup

# Step 2 : Stop Apache2
sudo service apache2 stop

# Step 3 : Upgrade Apache2 
# Warning: When prompted by the upgrade script asking if you would like to replace the existing config file with newer one, say NO!. 
# If you in a hurry select yes, don't forget to replace it with one from the backup you took in step 1.
sudo apt update
sudo apt upgrade apache2

# Step 4 : Check if config files have changed. (Optional, in our case it didn't!)
sudo apt install colordiff
colordiff /etc/apache2/apache2.conf /etc/apache2_bkup/apache2.conf

# Step 5 : Check if enabled sites and enabled modules still exist as it was earlier.  (Optional, in our case it didn't!)
diff <(ls -l /etc/apache2/sites-enabled) <(ls /etc/apache2_bkup/sites-enabled)
diff <(ls -l /etc/apache2/mods-enabled) <(ls /etc/apache2_bkup/mods-enabled)

# Step 6 : Start Apache service and do sanity test post upgrade
sudo service apache2 start

# Step 7 : Check your Apache Version now
apache2 -v