Follow these steps to install the mod_socache_shmcb module for Apache:
1. Update your system and install necessary build tools: \`\`\` sudo apt-get update sudo apt-get upgrade sudo apt-get install build-essential \`\`\`
1. Install Apache development package: \`\`\` sudo apt-get install apache2-dev \`\`\`
1. Get source code of your installed Apache. You can check your installed Apache version via `apache2 -v`. In this example, I’ll assume Apache version is 2.4.29. \`\`\`bash wget http://archive.apache.org/dist/httpd/httpd-2.4.29.tar.gz tar -xzf httpd-2.4.29.tar.gz cd httpd-2.4.29/ \`\`\`
1. Compile mod_socache_shmcb module: \`\`\`bash sudo apxs2 -i -a -c modules/cache/mod_socache_shmcb.c \`\`\`
1. Above command should automatically add LoadModule line to Apache configuration, if not you should add following line to your Apache configuration manually: \`\`\`bash LoadModule socache_shmcb_module /usr/lib/apache2/modules/mod_socache_shmcb.so \`\`\`
1. Restart Apache server: \`\`\`bash sudo service apache2 restart \`\`\`
1. To verify the module works correctly, use the following command: \`\`\`bash apachectl -M | grep socache\_shmcb \`\`\` If the module is installed properly and loaded to the Apache server, it will return something like: `socache_shmcb_module (shared)`
Please note: The location of the Apache configuration file can vary based on how Apache is installed on your system. It can be `/etc/apache2/httpd.conf`, `/etc/apache2/apache2.conf`, or `/etc/httpd/httpd.conf`.
