Shell script to change Apache port number

horendus · 02-05-2016, 03:06 AM

Im running a Apache web server and I want to be able to change the http port number Apache uses from a Bash script.

The new port number is coming from a text file containing a bunch of other settings I also use.

Its formatted like this server_port="8080"

I know where it needs to be changed (in 2 places within the Apache install dir) but I am struggling to do it automatically with a bash file as im quite new to Bash scripting.

An example of how its done with a great explanation of how it works would be fantastic.

Thanks in advanced :-)

HMW · 02-05-2016, 04:32 AM

Well... it's hard to give an example without knowing how the text file looks like.

But, if it were me, I would read the text file (probably using a while loop), look for the string

Code:

server_port

I would then save the port (in this example 8080) and use sed to replace the current port in the Apache config file with the port we get from the text file.

Best regards,
HMW

horendus · 02-05-2016, 04:41 AM

I decided to just do some reading and came up with this which works just fine.
Im sure some of the experts will be able to turn my work into just 2 lines but I had to do it step by step to work it out.

Code:

#!/bin/bash

#Get the server port number from my settings file
serverPort=`grep 'server_port' /var/www/pyclock/app/settings.txt`
echo $serverPort

##Get just the port number from the settings variable I just grabbed
serverPort=${serverPort##*=}
echo $serverPort

##Remove the "" marks from the variable as they will not be needed
serverPort=${serverPort//'"'}
echo $serverPort

##Replace 'Virtual Hosts' and 'List' entries with the new port number
sudo  sed -i.bak 's/.*NameVirtualHost.*/NameVirtualHost *:'$serverPort'/' /etc/apache2/ports.conf 
sudo  sed -i.bak 's/.*Listen.*/Listen '$serverPort'/' /etc/apache2/ports.conf

##Restart the apache server to use new port
sudo /etc/init.d/apache2 reload

FEEL FREE TO RE FACTOR THIS
Lets see who can do this in the LEAST amount of code!

HMW · 02-05-2016, 06:13 AM

Looks pretty damn good to me. No reason to shorten it. I prefer readability over "who can write the most incomprehensible oneliner".

Good work!

michaelk · 02-05-2016, 06:32 AM

You could use the source command which would in a nutshell execute the commands in your settings file. So there is no need to grep. Also depends on what else is in the file.

Code:

#!/bin/bash

. /var/www/pyclock/app/settings.txt (. is a shortcut for source)
echo $serverport

serverPort=${serverPort//'"'} (You could eliminate the the "" in the settings file if you wanted to remove this command)
echo $serverport

##Replace 'Virtual Hosts' and 'List' entries with the new port number
sudo  sed -i.bak 's/.*NameVirtualHost.*/NameVirtualHost *:'$serverPort'/' /etc/apache2/ports.conf 
sudo  sed -i.bak 's/.*Listen.*/Listen '$serverPort'/' /etc/apache2/ports.conf

##Restart the apache server to use new port
sudo /etc/init.d/apache2 reload

http://www.cyberciti.biz/faq/linux-b...ource-command/