Categories
SysOps

How to create the simplest possible nftables firewall

Create the simplest possible firewall using nftables framework with relaxed rules that will allow all outgoing traffic, incoming ICMP echo requests, and ssh connections.

Categories
SecOps

How to create site-to-site connection using IPsec

Use the native IPsec stack to connect multiple networks over the internet.

Categories
DevOps

How to configure the Vagrant virtual machine to use a specific proxy

Configure the Vagrant virtual machine to use a specific proxy using the vagrant-proxyconf plugin.

Categories
SysOps

How to log SSL cipher and protocol information in Nginx

Define custom Nginx log format to store SSL cipher and protocol information.

Categories
SecOps

How to trace packets as they pass through the firewall

Trace packets as they pass through the iptables firewall.

Categories
WebOps

How to enforce specific referer header using nginx

Enforce specific referer header using nginx directives.

How to enable debugging log in nginx

Enable debugging log in Nginx to inspect internal behavior and upstream interactions.

How to clear bash history on logout

Automatically clear GNU Bourne-Again SHell history when you exit a login shell.

How to check available security updates

Check available security updates for CentOS 7.

How to test TLS/SSL encryption anywhere on any port

Test TLS/SSL encryption anywhere on any port