Container Security Practices and Docker Hardened Images

This white paper outlines the security measures associated with container technology, specifically focusing on Docker's approach to securing containers through Docker Hardened Images (DHI). It discusses the limitations of traditional public base images, which are often not designed with enterprise security in mind, and contrasts these with the features of DHI, which include ultra-minimal images, non-root execution by default, and built-in cryptographic signing. The paper also details how DHI improves compliance and auditability while reducing the attack surface. Independent assessments from Security Research Labs validate the security claims of DHI, confirming its architecture and hardening strategies. Furthermore, the document emphasizes the importance of attestation and provenance in the software supply chain, highlighting how DHI enables teams to automate trust policies and meet regulatory compliance. The paper concludes with insights into Docker's customization capabilities, which allow secure modifications without compromising the integrity of the hardened images.