{"id":4260,"date":"2025-10-19T14:13:54","date_gmt":"2025-10-19T14:13:54","guid":{"rendered":"https:\/\/code2deploy.com\/blog\/?p=4260"},"modified":"2025-10-19T14:13:55","modified_gmt":"2025-10-19T14:13:55","slug":"docker-and-kubernetes-security-checklist","status":"publish","type":"post","link":"https:\/\/code2deploy.com\/blog\/docker-and-kubernetes-security-checklist\/","title":{"rendered":"Docker and Kubernetes Security Checklist!!"},"content":{"rendered":"\n

Securing containerized environments is no longer optional \u2014 it\u2019s essential. Whether you\u2019re managing Docker, Kubernetes, or bare-metal servers, security misconfigurations can lead to major vulnerabilities.
This guide provides a complete, production-grade security checklist<\/strong> covering Docker Compose<\/strong>, Dockerfiles<\/strong>, Kubernetes Pods<\/strong>, and Linux servers<\/strong> \u2014 following industry best practices and CIS Benchmarks.<\/p>\n\n\n\n

\ud83d\udd34 Malware Injection Scenarios Through Docker<\/strong><\/p>\n\n\n\n

One common attack scenario occurs when containers are left exposed to the internet without proper protections. For example, an exposed PostgreSQL container with weak or default credentials can be discovered by attackers using automated scanning tools like Masscan or Shodan. Once found, attackers can gain access using default passwords, SQL injection, or known CVEs, then execute commands to download and run malware<\/strong> such as cryptominers (kdevtmpfsi<\/code>)<\/strong> or other malicious scripts inside the container. This malware can consume excessive CPU resources, attempt persistence via cron jobs, disable security tools, and even scan for other vulnerable systems. Similar risks exist for other services: exposed Redis containers can allow attackers to write malicious cron jobs or SSH keys; mounting the Docker socket or host filesystem gives attackers root access to the host; and using untrusted images can lead to supply chain attacks. The key takeaway is that any service exposed to 0.0.0.0<\/code> without proper authentication or restrictions is likely to be found and exploited within hours or days. Always bind internal services to 127.0.0.1<\/code>, use strong passwords, avoid privileged mounts, and monitor container activity to prevent such attacks.<\/p>\n\n\n\n

PRODUCTION SECURITY CHECKLIST<\/h1>\n\n\n\n

DOCKER SECURITY<\/h2>\n\n\n\n

\u2610 All services bound to 127.0.0.1 (not 0.0.0.0)<\/p>\n\n\n\n

\u2610 Containers run as non-root user<\/p>\n\n\n\n

\u2610 Read-only filesystem enabled where possible<\/p>\n\n\n\n

\u2610 tmpfs mounted with noexec,nosuid<\/p>\n\n\n\n

\u2610 Resource limits set (CPU, memory, PIDs)<\/p>\n\n\n\n

\u2610 Security options: no-new-privileges=true<\/p>\n\n\n\n

\u2610 Capabilities dropped (cap_drop: ALL)<\/p>\n\n\n\n

\u2610 Secrets in environment variables or Docker secrets<\/p>\n\n\n\n

\u2610 Images scanned with Trivy\/Grype<\/p>\n\n\n\n

\u2610 Images signed with Docker Content Trust<\/p>\n\n\n\n

\u2610 Multi-stage builds used<\/p>\n\n\n\n

\u2610 Health checks implemented<\/p>\n\n\n\n

\u2610 Logging configured and centralized<\/p>\n\n\n\n

KUBERNETES SECURITY<\/h2>\n\n\n\n

\u2610 Pod Security Standards enforced (restricted)<\/p>\n\n\n\n

\u2610 Security contexts set (runAsNonRoot, readOnlyRootFilesystem)<\/p>\n\n\n\n

\u2610 Network policies implemented (default deny)<\/p>\n\n\n\n

\u2610 Resource quotas and limit ranges set<\/p>\n\n\n\n

\u2610 RBAC with minimal permissions<\/p>\n\n\n\n

\u2610 Secrets externalized (Vault\/Sealed Secrets)<\/p>\n\n\n\n

\u2610 Admission controllers enabled<\/p>\n\n\n\n

\u2610 Image pull policies set to specific versions<\/p>\n\n\n\n

\u2610 Service accounts with minimal permissions<\/p>\n\n\n\n

\u2610 Namespaces isolated<\/p>\n\n\n\n

\u2610 Audit logging enabled<\/p>\n\n\n\n

BARE METAL SECURITY<\/h2>\n\n\n\n

\u2610 SSH hardened (no root, keys only, non-standard port)<\/p>\n\n\n\n

\u2610 Firewall configured (UFW\/iptables)<\/p>\n\n\n\n

\u2610 Fail2ban installed and configured<\/p>\n\n\n\n

\u2610 Automatic security updates enabled<\/p>\n\n\n\n

\u2610 Audit logging configured (auditd)<\/p>\n\n\n\n

\u2610 File integrity monitoring (AIDE)<\/p>\n\n\n\n

\u2610 Kernel hardened (sysctl)<\/p>\n\n\n\n

\u2610 Rootkit scanners running (rkhunter, chkrootkit)<\/p>\n\n\n\n

\u2610 AppArmor\/SELinux enabled<\/p>\n\n\n\n

\u2610 Intrusion detection system deployed (Suricata\/OSSEC)<\/p>\n\n\n\n

\u2610 Log aggregation configured<\/p>\n\n\n\n

\u2610 Backups automated and encrypted<\/p>\n\n\n\n

\u2610 Monitoring stack deployed (Prometheus\/ELK)<\/p>\n\n\n\n

\u2610 Compliance scanning scheduled (Lynis, OpenSCAP)<\/p>\n\n\n\n

ONGOING OPERATIONS<\/h2>\n\n\n\n

\u2610 Vulnerability scanning automated<\/p>\n\n\n\n

\u2610 Security patches applied weekly<\/p>\n\n\n\n

\u2610 Access logs reviewed daily<\/p>\n\n\n\n

\u2610 Incident response plan documented<\/p>\n\n\n\n

\u2610 Disaster recovery plan tested<\/p>\n\n\n\n

\u2610 Security awareness training completed<\/p>\n\n\n\n

\u2610 Third-party security audit scheduled<\/p>\n\n\n\n

\u2610 Penetration testing scheduled quarterly<\/p>\n\n\n\n

\u2610 Backup restoration tested monthly<\/p>\n\n\n\n

\u2610 Security metrics tracked and reviewed<\/p>\n\n\n\n

INCIDENT RESPONSE READY<\/h2>\n\n\n\n

\u2610 Incident response playbook created<\/p>\n\n\n\n

\u2610 Emergency contacts documented<\/p>\n\n\n\n

\u2610 Forensics tools installed<\/p>\n\n\n\n

\u2610 Backup communication channels established<\/p>\n\n\n\n

\u2610 Post-incident review process defined<\/p>\n\n\n\n

\n\n\n\n

Docker Compose Security Best Practices with example!!<\/h2>\n\n\n\n

\u2705 Network Security<\/h3>\n\n\n\n

Avoid exposing containers directly to the internet.<\/p>\n\n\n\n

# \u274c Bad - Exposed to internet\nports:\n  - \"5432:5432\"\n\n# \u2705 Good - Localhost only\nports:\n  - \"127.0.0.1:5432:5432\"\n\n# \u2705 Best - No port binding (internal communication only)\n# Remove ports section entirely for internal services\n<\/code><\/pre>\n\n\n\n
\u2705 Container Hardening<\/h3>\n\n\n\n
services:\n  app:\n    security_opt:\n      - no-new-privileges:true\n    user: \"1000:1000\"\n    read_only: true\n    cap_drop:\n      - ALL\n    cap_add:\n      - NET_BIND_SERVICE\n    tmpfs:\n      - \/tmp:noexec,nosuid,size=64M\n      - \/run:noexec,nosuid,size=10M\n<\/code><\/pre>\n\n\n\n
    \n
  • Prevent privilege escalation<\/li>\n\n\n\n
  • Run as a non-root user<\/li>\n\n\n\n
  • Limit container capabilities<\/li>\n\n\n\n
  • Mount \/tmp<\/code> as noexec<\/code> to prevent malware execution<\/li>\n<\/ul>\n\n\n\n
    \u2705 Resource Limits<\/h3>\n\n\n\n
    deploy:\n  resources:\n    limits:\n      cpus: '2.0'\n      memory: 2G\n    reservations:\n      cpus: '0.5'\n      memory: 512M\npids_limit: 200\nrestart: unless-stopped<\/code><\/pre>\n\n\n\n
      \n
    • Prevent resource abuse<\/li>\n\n\n\n
    • Avoid \u201calways\u201d restart loops<\/li>\n<\/ul>\n\n\n\n
      \u2705 Secrets Management<\/h3>\n\n\n\n
      Never hardcode secrets in Docker Compose files.<\/p>\n\n\n\n
      # \u274c Bad\nenvironment:\n  DB_PASSWORD: mypassword123\n\n# \u2705 Good\nenv_file:\n  - .env\n\n# \u2705 Better\nsecrets:\n  - db_password\n\nsecrets:\n  db_password:\n    file: .\/secrets\/db_password.txt\n<\/code><\/pre>\n\n\n\n
      \u2705 Volume Security<\/h3>\n\n\n\n
      volumes:\n  - .\/config:\/app\/config:ro\n  - app_data:\/var\/lib\/app\n  # - \/var\/run\/docker.sock:\/var\/run\/docker.sock  # \u274c DANGEROUS\n<\/code><\/pre>\n\n\n\n
        \n
      • Use read-only mounts<\/li>\n\n\n\n
      • Prefer named volumes<\/li>\n\n\n\n
      • Avoid mounting Docker socket<\/li>\n<\/ul>\n\n\n\n
        \u2705 Network Isolation<\/h3>\n\n\n\n
        networks:\n  frontend:\n    driver: bridge\n  backend:\n    driver: bridge\n    internal: true\n<\/code><\/pre>\n\n\n\n
          \n
        • Keep backend services private<\/li>\n\n\n\n
        • Isolate internal communication<\/li>\n<\/ul>\n\n\n\n
          \n\n\n\n
          \u2705 Complete Secure Docker Compose Example<\/h2>\n\n\n\n
          version: '3.8'\n\nservices:\n  web:\n    image: myapp:latest\n    user: \"1000:1000\"\n    read_only: true\n    security_opt:\n      - no-new-privileges:true\n    cap_drop:\n      - ALL\n    cap_add:\n      - NET_BIND_SERVICE\n    ports:\n      - \"127.0.0.1:8080:8080\"\n    env_file:\n      - .env\n    secrets:\n      - db_password\n    networks:\n      - frontend\n      - backend\n    tmpfs:\n      - \/tmp:noexec,nosuid,size=100M\n    deploy:\n      resources:\n        limits:\n          cpus: '1.0'\n          memory: 1G\n    restart: unless-stopped\n    healthcheck:\n      test: [\"CMD\", \"curl\", \"-f\", \"http:\/\/localhost:8080\/health\"]\n\n  db:\n    image: postgres:16-alpine\n    user: \"70:70\"\n    read_only: true\n    networks:\n      - backend\n    env_file:\n      - .env\n    secrets:\n      - db_password\n    tmpfs:\n      - \/tmp:noexec,nosuid,size=64M\n    volumes:\n      - db_data:\/var\/lib\/postgresql\/data\n\nnetworks:\n  frontend:\n    driver: bridge\n  backend:\n    driver: bridge\n    internal: true\n\nvolumes:\n  app_data:\n  db_data:\n\nsecrets:\n  db_password:\n    file: .\/secrets\/db_password.txt\n<\/code><\/pre>\n\n\n\n
          \n\n\n\n
          Dockerfile Security Best Practices<\/h2>\n\n\n\n
          \u2705 Base Image Security<\/h3>\n\n\n\n
            \n
          • Never use the latest<\/code> tag<\/li>\n\n\n\n
          • Use minimal or distroless images<\/li>\n<\/ul>\n\n\n\n
            # \u2705 Secure Example\nFROM node:20.10.0-alpine@sha256:abc123...<\/code><\/pre>\n\n\n\n
            \u2705 Non-Root User<\/h3>\n\n\n\n
            RUN addgroup -g 1000 appuser && \\\n    adduser -D -u 1000 -G appuser appuser\nUSER appuser<\/code><\/pre>\n\n\n\n
            \u2705 Multi-Stage Builds<\/h3>\n\n\n\n
            Reduce image size and attack surface.<\/p>\n\n\n\n
            FROM node:20-alpine AS builder\nRUN npm ci --only=production && npm run build\n\nFROM node:20-alpine\nCOPY --from=builder \/app\/dist .\/dist\nUSER appuser<\/code><\/pre>\n\n\n\n
            \u2705 Secrets Management<\/h3>\n\n\n\n
            Use BuildKit secrets, never embed them in images.<\/p>\n\n\n\n
            RUN --mount=type=secret,id=mysecret \\\n    cat \/run\/secrets\/mysecret > \/app\/config<\/code><\/pre>\n\n\n\n
            \u2705 File Permissions<\/h3>\n\n\n\n
            RUN chmod -R 755 \/app && chmod 600 \/app\/secrets\/*<\/code><\/pre>\n\n\n\n
            \u2705 Health Checks<\/h3>\n\n\n\n
            HEALTHCHECK --interval=30s --timeout=3s \\\n  CMD curl -f http:\/\/localhost:8080\/health || exit 1<\/code><\/pre>\n\n\n\n
            \n\n\n\n
            Kubernetes Security Checklist<\/h2>\n\n\n\n
            \u2705 Pod Security<\/h3>\n\n\n\n
            Use restrictive Pod Security Contexts.<\/p>\n\n\n\n
            securityContext:\n  runAsNonRoot: true\n  runAsUser: 1000\n  fsGroup: 1000\n  seccompProfile:\n    type: RuntimeDefault<\/code><\/pre>\n\n\n\n
            \u2705 Pod Security Standards (PSS)<\/h3>\n\n\n\n
            Apply at the namespace level.<\/p>\n\n\n\n
            metadata:\n  labels:\n    pod-security.kubernetes.io\/enforce: restricted<\/code><\/pre>\n\n\n\n
            \u2705 Network Policies<\/h3>\n\n\n\n
            Default deny, then allow selective ingress\/egress.<\/p>\n\n\n\n
            kind: NetworkPolicy\npolicyTypes:\n  - Ingress\n  - Egress<\/code><\/pre>\n\n\n\n
            \u2705 Secrets Management<\/h3>\n\n\n\n
            Use External Secrets<\/strong> or Sealed Secrets<\/strong> instead of raw Kubernetes Secrets.<\/p>\n\n\n\n
            \u2705 RBAC<\/h3>\n\n\n\n
            Assign minimal permissions using Roles<\/strong> and RoleBindings<\/strong>.<\/p>\n\n\n\n
            \u2705 Resource Quotas & Limit Ranges<\/h3>\n\n\n\n
            Prevent resource overuse with quotas per namespace.<\/p>\n\n\n\n
            \u2705 Admission Controllers<\/h3>\n\n\n\n
            Enable:<\/p>\n\n\n\n
            PodSecurity, LimitRanger, ResourceQuota, ServiceAccount, NodeRestriction<\/code><\/pre>\n\n\n\n
            \n\n\n\n
            \ud83e\uddf1 Bare-Metal Server Security Checklist<\/h2>\n\n\n\n
            \u2705 SSH Security<\/h3>\n\n\n\n
              \n
            • Disable root login<\/li>\n\n\n\n
            • Enforce key-based authentication<\/li>\n\n\n\n
            • Restrict users and IPs<\/li>\n<\/ul>\n\n\n\n
              PermitRootLogin no\nPasswordAuthentication no\nAllowUsers deployuser adminuser<\/code><\/pre>\n\n\n\n
              \u2705 Firewall (UFW)<\/h3>\n\n\n\n
              ufw default deny incoming\nufw allow 22\/tcp comment 'SSH'\nufw allow 80,443\/tcp comment 'Web Traffic'\nufw limit 22\/tcp<\/code><\/pre>\n\n\n\n
              \u2705 Fail2ban<\/h3>\n\n\n\n
              Block brute-force login attempts automatically.<\/p>\n\n\n\n
              \u2705 Automatic Security Updates<\/h3>\n\n\n\n
              Use unattended-upgrades<\/code> to auto-install patches.<\/p>\n\n\n\n
              \u2705 User Management<\/h3>\n\n\n\n
              Create non-root users and enforce strong password policies.<\/p>\n\n\n\n
              \u2705 Audit Logging<\/h3>\n\n\n\n
              Monitor critical file and authentication changes using auditd<\/code>.<\/p>\n\n\n\n
              \u2705 File Integrity Monitoring<\/h3>\n\n\n\n
              Use AIDE<\/code> for detecting unauthorized changes.<\/p>\n\n\n\n
              \u2705 Kernel Hardening<\/h3>\n\n\n\n
              Apply sysctl rules:<\/p>\n\n\n\n
              net.ipv4.ip_forward = 0\nkernel.kptr_restrict = 2\nnet.ipv4.tcp_syncookies = 1<\/code><\/pre>\n\n\n\n
              \u2705 Docker Host Security<\/h3>\n\n\n\n
              Configure \/etc\/docker\/daemon.json<\/code> for secure defaults:<\/p>\n\n\n\n
              {\n  \"icc\": false,\n  \"userns-remap\": \"default\",\n  \"live-restore\": true\n}<\/code><\/pre>\n\n\n\n
              \u2705 Rootkit Detection<\/h3>\n\n\n\n
              Install and automate rkhunter<\/code> and chkrootkit<\/code> scans.<\/p>\n\n\n\n
              \u2705 AppArmor\/SELinux<\/h3>\n\n\n\n
              Always enable one for mandatory access control.<\/p>\n\n\n\n
              \n\n\n\n
              Security Scanning & Monitoring<\/h2>\n\n\n\n
              \u2705 Trivy<\/h3>\n\n\n\n
              trivy image myapp:latest\ntrivy config Dockerfile<\/code><\/pre>\n\n\n\n
              \u2705 Grype<\/h3>\n\n\n\n
              Alternative vulnerability scanner for CI\/CD pipelines.<\/p>\n\n\n\n
              \u2705 Falco<\/h3>\n\n\n\n
              Runtime threat detection for containers and Kubernetes.<\/p>\n\n\n\n
              \n\n\n\n
              Summary: Complete Container Security Checklist<\/h2>\n\n\n\n
              Layer<\/th>Key Practices<\/th><\/tr><\/thead>
              Docker Compose<\/strong><\/td>Localhost binding, no root, secrets, resource limits<\/td><\/tr>
              Dockerfile<\/strong><\/td>Minimal base, multi-stage, no secrets, healthcheck<\/td><\/tr>
              Kubernetes<\/strong><\/td>Restricted PSS, RBAC, network policies, quotas<\/td><\/tr>
              Bare Metal<\/strong><\/td>Harden SSH, enable UFW, auditd, kernel sysctl<\/td><\/tr>
              Monitoring<\/strong><\/td>Trivy, Falco, Grype, Docker Scout<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
              \n\n\n\n
              Final Thoughts<\/h3>\n\n\n\n
              Container security is a continuous process<\/strong>, not a one-time setup.
              Follow these checklists regularly, integrate vulnerability scans<\/strong> into your CI\/CD pipeline<\/strong>, and review security configurations quarterly.<\/p>\n\n\n\n
              By implementing these best practices, you\u2019ll significantly reduce the attack surface across Docker<\/strong>, Kubernetes<\/strong>, and bare-metal infrastructure<\/strong> \u2014 achieving compliance and resilience in production.<\/p>\n","protected":false},"excerpt":{"rendered":"
              Securing containerized environments is no longer optional \u2014 it\u2019s essential. Whether you\u2019re managing Docker, Kubernetes, or bare-metal servers, security misconfigurations can lead to major vulnerabilities.This guide provides a complete, production-grade security checklist covering Docker Compose, Dockerfiles, Kubernetes Pods, and Linux servers \u2014 following industry best practices and CIS Benchmarks. \ud83d\udd34 Malware Injection Scenarios Through Docker […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[31,81,9],"tags":[875,27,7,871,870,8,874,10,873,35,872,39],"class_list":["post-4260","post","type-post","status-publish","format-standard","hentry","category-containerization-docker","category-docker","category-kubernetes","tag-cryptominers-kdevtmpfsi","tag-devops","tag-docker","tag-falco","tag-hardening","tag-k8s","tag-kdevtmpfsi","tag-kubernetes","tag-malware-injection","tag-security","tag-server-security","tag-trivy"],"yoast_head":"\nDocker and Kubernetes Security Checklist!! - code2deploy.com<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/code2deploy.com\/blog\/docker-and-kubernetes-security-checklist\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Docker and Kubernetes Security Checklist!! - code2deploy.com\" \/>\n<meta property=\"og:description\" content=\"Securing containerized environments is no longer optional \u2014 it\u2019s essential. 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