How to configure security auditing and runtime security scanning for Docker containers?
The security of containerized applications is not limited to checking image source code before building. Monitoring the behavior of running containers in real-time is equally important, as attackers can exploit zero-day vulnerabilities or configuration errors to gain unauthorized access after the system has started.
To implement runtime security, specialized monitoring tools for host operating system kernel system calls and network activity are used. Solutions like Falco or Sysdig intercept container requests to system resources and compare them against predefined suspicious behavior rules.
The main stages of implementing security auditing include:
Special attention during runtime configuration is paid to namespace isolation and limiting kernel capabilities through the capabilities mechanism. Disabling unnecessary system privileges at container startup significantly reduces the likelihood of a successful attack on the host system, even if the attacker managed to bypass security inside the application itself.