# 📚 How to update your Docker containers safely ## Purpose Learn how to update your Docker containers safely, minimizing downtime and preventing accidental data loss. --- ## 1. Check Running Containers List all currently running containers to know what services are active:
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```bash docker ps ``` --- ## 2. Pull the Latest Images For each image you want to update, pull the latest version from the registry:
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```bash docker pull imagename:tag ``` *Replace `imagename:tag` with your actual image name and tag.* --- ## 3. Stop and Remove Old Containers Stop the container without deleting its data volumes:
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```bash docker stop containername docker rm containername ``` *Replace `containername` with your actual container name.* --- ## 4. Start New Containers with Updated Images Use your original `docker run` command or your `docker-compose` file to launch the updated containers.
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```bash docker run -d --name containername imagename:tag ``` --- ## 5. Verify Everything is Working After starting the new containers, check that everything is healthy:
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```bash docker ps docker logs containername ``` --- ## ✅ Summary - **Always backup your data volumes** before updating if possible. - **Use versioned tags** (e.g., `nginx:1.25`) instead of `latest` to avoid unexpected changes. - **Use compose files** to automate container recreation safely.