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API Reference: Docker Daemon Configuration Hardening

daemon.json Location

  • Linux: /etc/docker/daemon.json
  • Windows: C:\ProgramData\docker\config\daemon.json
{
  "icc": false,
  "live-restore": true,
  "userland-proxy": false,
  "no-new-privileges": true,
  "userns-remap": "default",
  "log-driver": "json-file",
  "log-opts": {"max-size": "10m", "max-file": "3"},
  "tls": true,
  "tlsverify": true,
  "tlscacert": "/etc/docker/ca.pem",
  "tlscert": "/etc/docker/server-cert.pem",
  "tlskey": "/etc/docker/server-key.pem"
}

CIS Docker Benchmark — Daemon Settings

CIS # Setting Recommendation
2.1 icc Set to false
2.2 live-restore Set to true
2.3 userland-proxy Set to false
2.4 no-new-privileges Set to true
2.6 TLS Enable with certificates
2.8 userns-remap Set to default
2.12 Logging Configure centralized logging

File Permission Checks

File Permissions
/etc/docker/daemon.json 644
/var/run/docker.sock 660
/etc/docker/certs.d/ 444
Docker service files 644

Docker Socket Security

Check permissions

ls -la /var/run/docker.sock
# srw-rw---- 1 root docker 0 ... /var/run/docker.sock

Restrict group access

chmod 660 /var/run/docker.sock
chown root:docker /var/run/docker.sock

Content Trust (Image Signing)

Enable globally

export DOCKER_CONTENT_TRUST=1

In daemon.json

{"content-trust": {"mode": "enforced"}}

Docker Info Command

docker info --format '{{json .}}'

Key Fields

Field Description
SecurityOptions seccomp, apparmor, userns
LiveRestoreEnabled Live restore status
RegistryConfig.InsecureRegistryCIDRs Insecure registries
ServerVersion Docker version