Apache

Some useful links to explain the concepts of Apache

Concepts

• http://code.tutsplus.com/tutorials/an-introduction-to-apache–net-25786

• http://fideloper.com/quick-caching-explanation

• https://anturis.com/blog/get-insight-into-your-website-performance-with-key-apache-statistics/

• http://middlewaretechnologies.blogspot.in/2013/04/have-you-ever-tried-installing-apache.html

Information about MPM (Multi Processing Modules)

• https://prakash-khadka.com.np/apache-mpm/

• http://articles.slicehost.com/2010/12/3/configuring-the-apache-mpm-on-gentoo

• https://serverfault.com/questions/383526/how-do-i-select-which-apache-mpm-to-use

Configuration

• http://fideloper.com/ubuntu-12-04-lamp-server-setup

• https://www.linode.com/docs/websites/apache/apache-web-server-on-centos-6

• https://www.linode.com/docs/websites/lamp/lamp-on-centos-6/

• http://www.erikwebb.net/blog/compile-and-install-apache-24-red-hat-enterprise-linux-rhel-6-or-centos-6/

• https://www.digitalocean.com/community/tutorials/how-to-install-linux-apache-mysql-php-lamp-stack-on-centos-6

• http://shapeshed.com/domain_forwarding_in_apache/

• https://www.linode.com/docs/websites/apache-tips-and-tricks/redirect-urls-with-the-apache-web-server

• http://www.tecmint.com/creating-your-own-webserver-and-hosting-a-website-from-your-linux-box/

• https://serversforhackers.com/video/php-fpm-configuration-the-listen-directive

• https://coderwall.com/p/hmsr5a/have-php-fpm-listen-on-unix-socket

Virtual Hosting

• http://www.thegeekstuff.com/2011/07/apache-virtual-host/

• https://support.rackspace.com/how-to/how-to-serve-multiple-domains-using-virtual-hosts/

• https://mobile.serverwatch.com/tutorials/article.php/1127571/Apache-Guide-Setting-Up-Virtual-Hosts.htm

• https://serversforhackers.com/configuring-apache-virtual-hosts

• http://www.thegeekstuff.com/2011/07/apache-virtual-host/

• https://www.digitalocean.com/community/tutorials/how-to-set-up-apache-virtual-hosts-on-centos-6

• https://www.digitalocean.com/community/tutorials/how-to-create-a-ssl-certificate-on-apache-for-centos-6

• http://aarvik.dk/good-apache-virtualhost/

HTaccess checks and guides

• http://www.htaccesscheck.com/

• http://htaccess.madewithlove.be/

• http://www.askapache.com/htaccess/htaccess.html

• http://socreativedigital.com/7-htaccess-file-examples-that-work-for-seo-2013-05-04

Tuning & Hardening

Apache Server Status Page

• http://www.tecmint.com/monitor-apache-web-server-load-and-page-statistics/

• http://www.coscale.com/blog/apache-troubleshooting-and-monitoring

• https://anturis.com/blog/get-insight-into-your-website-performance-with-key-apache-statistics/

• https://blog.serverdensity.com/monitor-apache/

Other Optimizations

• http://www.tecmint.com/apache-performance-tuning/

• http://www.ubuntufree.com/how-to-optimize-apache/

• https://www.maketecheasier.com/series/apache-server-guide/

• http://linuxbsdos.com/2015/02/17/how-to-reduce-php-fpm-php5-fpm-ram-usage-by-about-50/

• http://blog.chrismeller.com/configuring-and-optimizing-php-fpm-and-nginx-on-ubuntu-or-debian

• https://serversforhackers.com/video/php-fpm-process-management

• http://linuxconfig.org/apache-web-server-ssl-authentication

• https://geekflare.com/apache-web-server-hardening-security/

• https://geekflare.com/category/web-infrastructure/apache/

• http://www.acunetix.com/blog/articles/10-tips-secure-apache-installation/

• http://www.tecmint.com/apache-security-tips/

• http://www.thegeekstuff.com/2011/03/apache-hardening/

• https://haydenjames.io/strip-apache-improve-performance-memory-efficiency/

• http://www.serverlab.ca/tutorials/linux/web-servers-linux/configuring-selinux-policies-for-apache-web-servers/

• http://geekflare.com/apache-web-server-hardening-security/

Troubleshooting & Log Parsing

Find Original IPs of sites using CDNs like Cloudflare

• https://censys.io/

Levels of traffic with Apache access log

• http://www.inmotionhosting.com/support/website/server-usage/view-level-of-traffic-with-apache-access-log

• http://www.inmotionhosting.com/support/website/website-troubleshooting/determine-cause-of-server-usage-spike

• http://www.cyberciti.biz/faq/apache-logs/

• http://www.serverwatch.com/tutorials/article.php/1127521/Apache-Guide-Logging-with-ApacheUnderstanding-Your-accesslog.htm

• http://list.xmodulo.com/web-server-benchmarking-tools-linux.html

• http://stackoverflow.com/questions/9234699/understanding-apache-access-log

• http://logz.io/blog/apache-log-analyzer/

• http://www.the-art-of-web.com/system/logs/

Commands

• Find hits by IP to server from access log in ascending order

sudo tail -n 10000 <path-to-log-file> | awk '{print $2}' | sort | uniq -c | sort -n
sudo grep 'text' <path-to-access-log> | cut -d' ' -f1 | sort | uniq -c | sort -r

• Finding connections to all server IPs source/destination & sorting in ascending order

sudo netstat -antulp | awk '{print $4}' | cut -d":" -f1 | sort | uniq -c | sort -n
sudo netstat -antulp | awk '{print $5}' | cut -d":" -f1 | sort | uniq -c | sort -n