Backend Container Security — Securing Backend Containers

DodaTech Updated 2026-06-28 1 min read

In this tutorial, you'll learn about Backend Container Security. We cover key concepts, practical examples, and best practices to help you understand and apply this topic effectively.

Container security ensures backend applications run with minimal privileges and hardened configurations.

# Multi-stage build with security hardening
FROM node:20-alpine AS build
WORKDIR /app
COPY package*.json ./
RUN npm ci --only=production

FROM node:20-alpine
RUN apk add --no-cache dumb-init

# Create non-root user
RUN addgroup -g 1001 -S appgroup && \
    adduser -S appuser -u 1001 -G appgroup

WORKDIR /app
COPY --from=build /app/node_modules ./node_modules
COPY --chown=appuser:appgroup . .

# Security hardening
RUN chmod -R 555 /app && \
    chmod 777 /tmp && \
    chown -R appuser:appgroup /app

USER appuser

# Read-only root filesystem
# docker run --read-only --tmpfs /tmp

# Drop capabilities
# docker run --cap-drop=ALL --cap-add=NET_BIND_SERVICE

# Security options
# docker run --security-opt=no-new-privileges:true
# docker run --security-opt=seccomp=seccomp-profile.json

EXPOSE 8080
ENTRYPOINT ["dumb-init", "node", "server.js"]

// Kubernetes security context
// securityContext:
//   runAsNonRoot: true
//   runAsUser: 1001
//   runAsGroup: 1001
//   fsGroup: 1001
//   capabilities:
//     drop: ["ALL"]
//   readOnlyRootFilesystem: true

Container hardening reduces the Blast Radius of potential exploits by limiting container capabilities.

← Previous Backend Security Testing — Automating Security Testing for Backend APIs Next → Backend Secure Logging — Logging Without Exposing Sensitive Data

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