apache2.md

Apache2

This are my notes about the aventure of compiling Apache2. The most used webserver.

Environment

SO: Debian GNU/Linux 9.1 (stretch)

Compiling and runing a fresh new Apache2 Server

1. Install dependencies.

apt-get install libapr1-dev libaprutil1-dev 
apt-get install libpcre3-dev 

2. Download the source

wget http://apache.dattatec.com//httpd/httpd-2.4.39.tar.gz 

3. Configure

./configure --prefix=/opt/apache2/

4. Make

5. Install

Configuration

The apache configuration it's in the file /apache2/conf/httpd.conf.

To reload the configuration without restart the server run

/apache2/bin/apachectl -k graceful

You can test the config syntax running

/apache2/bin/apachectl configtest

mod_proxy: Using when you want to use apache as proxy between your users and the application server.

It's pretty common that some times you need to configure apache in front of your app to do balancer. (https://httpd.apache.org/docs/trunk/en/howto/reverse_proxy.html)

ProxyPass "/status-sim/" "http://167.71.57.12/"
ProxyPassReverse "/" "http://167.71.57.12/"

Above example will send all the traffic from our clients that goes to /status-sim/ to / in the app host 167.71.57.12

mod_proxy + balancer

TODO

KeepAlive

KeepAlive allows clients to re-use the same channel in each request. (https://httpd.apache.org/docs/2.4/es/mod/core.html#keepalive)

Testing some apache behavoirs with Curl

Of course to test a webserver there is nothing like a web browser. Or use curl (https://curl.haxx.se/) that tool that some http clients based in.

Example 1: Running multiple queries in the same connection to check how the keeaplive is working.

curl -k --trace trace.txt https://httpstat.us/200 https://httpstat.us/200 https://httpstat.us/500 https://httpstat.us/200

Plus! Jenkins file to compile the app

pipeline {
    agent any 
    stages {
        stage('Download') { 
            steps {
               sh 'wget http://apache.dattatec.com//httpd/httpd-2.4.39.tar.gz'
            }
        }
        stage('Compile') { 
            steps {
                sh 'tar -zxvf httpd-2.4.39.tar.gz'
                dir("./httpd-2.4.39") {
                    sh "./configure --prefix=/opt/apache2/"
                    sh "make"
                }
            }
        }
        stage('Install Bin') { 
            steps {
                dir("./httpd-2.4.39") {
                    sh "make install"
                }
            }
        }
    }
}