Docker Healthcheck Examples
Docker Health check instructions are defined inside the Dockerfile or in Docker-Compose files. For bettering here we defining a sample healthcheck in a Dockerfile, for a docker container that running a web server.
- Here, The health check instruction runs for every 30seconds of intervals ( –interval=30s ) , With a timeout of 10seconds ( –timeout=10s ) and retries of 3 times. It will check the reachability of the NGINX server using `curl` option, if the it fails ( i.e., unreachability ) then it will exits with status of 1.
FROM nginx:latest
# Define a healthcheck command
HEALTHCHECK --interval=30s --timeout=10s --retries=3 CMD curl -f http://localhost/ || exit 1
What is Docker Health Check ?
Docker Healthcheck instruction facilitates maintaining optimal docker container performance. It watchfully makes your container well-maintained by letting them know the status of the container. This article demonstrates the health check usage and its significance through a practical go-through using a Nginx container in the docker environment.
Table of Content
- What Is HEALTHCHECK Instruction In Docker?
- Docker HealthCheck
- Syntax 1 Of Docker HealthCheck
- Syntax 2 Of Docker Health Check
- Understanding Interval, timeout, start-period and retires options Of Health Check Instructions | Health Check Configurations
- Docker Healthcheck Examples
- How to Write a Custom Health Check Scripts
- Writing a Custom Health Check in Nodejs
- Common Usages For Docker Health Checks
- How To Use And Run Docker’s Health Check Command: A Step-By-Step Guide
- Docker HealthCheck Commands
- Docker HealthCheck Docker-Compose
- Docker HealthCheck curl
- Docker health Check Logs
- Docker Health Check Ports
- Docker Health Check Scripts
- Docker Health Check Status
- Conclusion
- Docker HealthCheck Instruction – FAQ’s