Docker Healthcheck Generator

Generate Docker HEALTHCHECK and Compose healthcheck configs with curl, shell scripts, intervals, retries, timeouts, and service checks.

Output:A ready-to-use configuration file for Docker Healthcheck with best practices applied.

Service Liveness & Readiness Probes

Healthcheck Protocol

Port

Path

Timing Thresholds

Interval

Timeout

Start Period

Retries

docker-compose.ymlNot Generated

Not generated yet

Why Healthchecks Matter

Without healthchecks, Docker only knows if your process crashed. It won't know if your web server is deadlocked or your database is still initializing.

By implementing health probes, you enable `depends_on: condition: service_healthy` in Docker Compose, ensuring perfect start-up orchestration without brittle `sleep` scripts.

Quick Summary

Use a Docker Healthcheck Generator when you need HEALTHCHECK commands or Compose healthcheck blocks to monitor whether a container is running correctly and to control startup order.

What is this tool?

The Docker HEALTHCHECK instruction tells Docker how to test a container to check that it is still working. This can detect cases such as a web server that is stuck in an infinite loop and unable to handle new connections, even though the server process is still running.

A Healthcheck Generator provides the exact syntax for intervals, timeouts, and start periods, ensuring your dependent services (like an API waiting for a database) don't start prematurely.

How to Use This Tool

Choose the target — Select whether you want a Dockerfile instruction or a Docker Compose YAML block.
Define the test command — Input the command to check health, such as a curl request or a database ping command (e.g., pg_isready).
Configure timings — Set the interval, timeout, retries, and start period to match your app's boot time.
Generate output — Click generate and copy the formatted healthcheck configuration into your files.

What This Tool Generates

Dockerfile HEALTHCHECK instruction.
docker-compose.yml healthcheck block.
healthcheck.sh script (optional advanced usage).
README setup notes — Best practices for deployment.

Example Output Explanation

A Docker Compose healthcheck for a web service:

healthcheck:
  test: ["CMD", "curl", "-f", "http://localhost:80/health"]
  interval: 30s
  timeout: 10s
  retries: 3
  start_period: 40s

Best Practices

Always define a 'start_period' for applications that take a long time to boot (like Java Spring Boot) so they aren't killed prematurely during startup.
Ensure the tool you use in the test command (like curl or wget) is actually installed in the container image.
Use the 'depends_on' condition 'service_healthy' in Compose to ensure dependent services wait for the healthcheck to pass.
Keep the healthcheck script extremely lightweight to avoid consuming excessive CPU over time.

Common Mistakes

Using a test command that requires a shell format but passing it as a direct executable array without 'CMD-SHELL'.
Setting the timeout higher than the interval, which can cause overlapping healthcheck executions.
Forgetting that a failing healthcheck does not automatically restart the container unless orchestrated by Swarm or configured with autoheal scripts.

Security Notes

Ensure the healthcheck endpoint (e.g., /healthz) does not expose sensitive application data or metrics to the public internet.
Validate your configs locally before deployment.
Run the healthcheck as a non-root user if the container drops privileges.

Testing Instructions

Add the healthcheck to your service.
Run docker compose up -d
Run docker ps and wait for the status to change from (health: starting) to (healthy).

Frequently Asked Questions

What is a Docker Healthcheck Generator?

It is a tool that generates the correct syntax for Docker HEALTHCHECK instructions in Dockerfiles or healthcheck blocks in Docker Compose, ensuring containers are monitored correctly.

How do I add a Docker healthcheck?

You can add a HEALTHCHECK instruction in your Dockerfile, or define a 'healthcheck' block in your docker-compose.yml under the specific service.

How do I use curl in Docker healthcheck?

You configure the test command to run 'curl -f http://localhost:8080/health || exit 1'. The generator formats this syntax perfectly for YAML or Dockerfiles.

Why is Docker healthcheck not working?

Common reasons include the container not having 'curl' or 'wget' installed, incorrect syntax in the test array, or the start_period being too short for the application to boot up.

Can I use a shell script for Docker healthcheck?

Yes, you can write a custom healthcheck.sh script, copy it into your image, and set the healthcheck test command to execute that script.

How We Keep Your Configs Safe & Valid

Built-in Error Checking

Every file is checked against official rules. We catch missing fields and bad syntax. YAML indentation errors are flagged right away. Kubernetes, Terraform, and Docker specs are all covered. API versions and labels are verified too. You get valid output every time you generate.

100% Private & Local

All tools run in your browser only. Your API keys never leave your machine. We do not use any tracking scripts. No data is sent to any server. Passwords and secrets stay on your device. Crypto operations use the Web Crypto API. Your privacy is fully protected at all times.

Secure Settings by Default

Configs use safe defaults out of the box. Containers run as non-root users. Root filesystems are set to read-only. Dangerous Linux capabilities are dropped. Network policies limit pod-to-pod traffic. TLS 1.3 is enabled for web servers. Security headers are added where needed.

Ready for CI/CD & Git

Output files are ready for your Git repo. Use them with ArgoCD, Flux, or GitHub Actions. Files use clear formatting and comments. Code review is easy for your team. Indentation and key order are consistent. Test in staging before going to production. Every file is clean and well-structured.

Infrastructure as Code

Store configs in Git alongside your code. Terraform modules include typed variables. Backend configs support remote state locking. Outputs work across multiple modules. Ansible playbooks use clear task steps. Chef and Puppet configs are also supported. Every file works with version control tools.

Monitoring & Tracing

Set up Prometheus with auto-discovery rules. Create Grafana dashboards with template variables. Add alerting rules with severity labels. Use OpenTelemetry for trace collection. Forward logs to Loki or Elasticsearch. Connect to Jaeger or Tempo for tracing. Monitor metrics, logs, and traces together.

Container & Docker Safety

Dockerfiles use multi-stage builds for small images. Base images are pinned to exact versions. Dev files are excluded from final images. Health checks are added for orchestrator use. Containers switch to non-root users. Docker Compose uses named volumes and networks. Resource limits are set in deploy configs.

Multiple Output Formats

Export as YAML, JSON, HCL, or TOML. Kubernetes uses YAML with proper separators. Terraform uses HCL with correct escaping. JSON output has consistent indentation. Copy to clipboard with one click. Preview output with syntax highlighting. Line numbers help you review quickly.

Official References

HEALTHCHECK instruction — Docker Docs