7.2.3.3 None Security Use
A focused guide to None Security Use, connecting core concepts with practical Docker and container operations.
None security use describes deliberately choosing the none network driver specifically as a security measure, eliminating network-based attack surface entirely for a workload that has no legitimate need for network access, rather than relying on a less absolute restriction layered on top of normal connectivity.
The Security Rationale for Disabling Networking
Removing networking capability structurally — rather than merely restricting it through firewall rules — eliminates an entire category of potential attack vector, since there is no network stack present for an attacker to leverage even if some other part of the container were compromised.
docker run -d --network none data-sanitizer:1.0
If this data sanitization tool processes untrusted input and were somehow exploited, the absence of any network capability at all prevents that exploit from being leveraged to exfiltrate data or establish a remote connection.
Why This Is Stronger Than Restrictive Firewall Rules Alone
A firewall rule blocking outbound traffic can potentially be misconfigured, bypassed through an overlooked rule, or undone if an attacker gains sufficient privilege within the container — the structural absence of networking entirely sidesteps this entire category of risk.
docker run -d --network none myapp:1.0
There's no firewall configuration to potentially misconfigure or bypass, since there's no network stack present in the first place.
Identifying Good Candidates for This Security Measure
Workloads processing genuinely untrusted input, performing computation that has no legitimate reason to communicate externally, are strong candidates for this kind of structural network isolation.
docker run --rm --network none -v $(pwd)/untrusted-file:/input:ro file-analyzer:1.0
Why None Security Use Matters
Deliberately applying the none driver as a security measure for appropriate workloads provides a strong, structural defense against network-based exploitation, representing one of the more effective and conceptually simple hardening techniques available for the specific class of workloads genuinely suited to it.