Docker

In order to deploy a Java application into AWS ECS (Elastic Container Service) using Terraform, we need to consider a few different things. Step 1 - Java Application Create a file called HelloWorld.java and add the following code to it: public class HelloWorld { public static void main(String[] args) { System.out.println("Hello, World!"); } } We now need to build our class as follows: javac HelloWorld.java Once this is done, we can package our application into a jar file:...

If you get the following error when trying to run a Docker container: Cannot connect to the Docker daemon at unix:/var/run/docker.sock. Is the docker daemon running? Then you can resolve it by running the following: systemctl start docker If this doesn’t work because of a root user issue, then you can do the following first: gpasswd -a $USER docker Additional issues? Issue 1 If you have tried the above, and get this error:...

If you get the following error when trying to run a Docker container that was built on an M1 mac: M1 docker preview and keycloak 'image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8)' Issue The solution Then you can do simply add the following argument to your docker build command. --platform linux/amd64 Where this goes docker build --platform linux/amd64 -t your_docker_item .

If you get the following error while running AWS CDK: raise JSIIError(resp.error) from JavaScriptError(resp.stack) jsii.errors.JSIIError: docker exited with status 1 Then you can resolve it as follows: How to solve docker exited with status 1 error Make sure that your local Docker client is running. Start docker on the local machine and CDK will be able to make the Docker connections required.

If you need to remove any old and unused Docker images, then you can do the following: How to Remove Old and Unused Docker Images Firstly you need to see all the images: docker images You can also use ls to see the Docker Images: docker image ls How to Remove a Single Docker Image The docker rmi command will remove a single Docker image as follows: docker rmi <image_id> You can also use the Docker image names as follows:...

If you need to copy files from a Docker Container to the Host, then you can do one of the following: Option 1 – Using docker cp Syntax: docker cp [OPTIONS] CONTAINER: SRC_PATH DEST_PATH Setup the container: # pull the ubuntu image docker pull ubuntu # run the container locally docker run -it -d ubuntu # connect to the container docker exec -it abcde123456 /bin/bash Create a file from the container:...

If you need to get the IP Address of a Docker Container, then you can do the following: Option 1 – Connect to the Bridge Network Find out the network setup: docker network ls Create a docker container and assign it to the bridge network: docker run -dt <nginx> Get the information about the container: docker ps Inspect the network: docker network inspect bridge Now you can see the container IP Address....

I have a parent directory containing multiple sub-directories. Each of these child directories is a different application and contains a Dockerfile. I want to build and push each image to AWS ECR. The directory looks as follows: ├── apps ├── microservice1 ├── app.js ├── Dockerfile ├── package.json └── readiness.txt ├── frontend ├── Dockerfile ├── index.html ├── package.json ├── server.js ├── microservice2 ├── app.py ├── bootstrap.sh ├── Dockerfile └── requirements.txt Notice there are 3 apps, each with their own Dockerfile, under the parent apps directory....

If you have a Flask app that you would like packaged in a Docker container, then you can do the following. The steps outlined below will help you create the following directory tree: └── flaskapp ├── Dockerfile ├── app.py └── requirements.txt Step 1 – Create your Flask app In a new directory, create the following files: app.py from flask import Flask app = Flask(__name__) @app.route('/') def hello_geek(): return '<h1>Hello world!</h2>' if __name__ == "__main__": app....

Ever needed to extract the files in a Docker container? Docker provides the save sub-command. Exporting Docker files into a Tar Archive The examples below use a Docker container called: aoms/hellojava Swap this out with your own container as required. docker save aoms/hellojava > hellojava.tar hellojava.tar now contains a list of files found in the Docker image. Taking it one step further You can make this a bit better by extracting it into a new directory and untarring automatically:...