How to Whitelist or Block IPs in your Firewall on Linux – iptables, firewalld, ufw

Knowing how to Whitelist and Blacklist IPs in your firewall can be very important when you want to allow or deny connection to your server, based on an IP address. Below we will cover how to allow and deny connections from IPs in IP Tables, Firewalld, and UFW. IPTables: Allowing or Denying connections from IPs Read more about How to Whitelist or Block IPs in your Firewall on Linux – iptables, firewalld, ufw[…]

Using SED in Linux to Edit Large Files

Recently I encountered a server that had an Apache configuration file that was over 500,000 lines. Changes needed to make were to comment out the CustomLog line for each domain in /etc/httpd/httpd.conf. For this command, I used SED. NAME sed – stream editor for filtering and transforming text SYNOPSIS sed [OPTION]… {script-only-if-no-other-script} [input-file]… DESCRIPTION Sed Read more about Using SED in Linux to Edit Large Files[…]

Linux mount CIFS Windows Share

CIFS stands for Common Internet File System. This is application-level network protocol mainly used to provide shared access to files, printers, serial ports, and miscellaneous communications between nodes. You can access CIFS share from Linux and mount them as a regular filesystem. This is handy if there is a backup service like Infrascale where you Read more about Linux mount CIFS Windows Share[…]

How do you calculate mysql max_connections variable

The basic formulas are: Available RAM = Global Buffers + (Thread Buffers x max_connections) max_connections = (Available RAM – Global Buffers) / Thread Buffers To get the list of buffers and their values: SHOW VARIABLES LIKE ‘%buffer%’; Here’s a list of the buffers and whether they’re Global or Thread: Global Buffers: key_buffer_size, innodb_buffer_pool_size, innodb_log_buffer_size, innodb_additional_mem_pool_size, Read more about How do you calculate mysql max_connections variable[…]

Add Gzip to Plesk Server

Instructions Login to your Plesk server. Select the domain you wish to enable gzip for from the left hand side. Click in Apache and nginx settings: Down the bottom, add the following to the “Additional nginx directives” field: gzip on; gzip_disable “MSIE [1-6]\.(?!.*SV1)”; gzip_proxied any; gzip_types text/plain text/css application/x-javascript application/javascript text/xml application/xml application/xml+rss text/javascript image/x-icon Read more about Add Gzip to Plesk Server[…]