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What is docker?

Getting Started

Download docker and install it on your computer

• Link to developer guide – https://docs.docker.com/ee/
• Select the docker option based on your operation system. In my case, I selected Docker for desktop mac. Then from there should be a link to download the docker executable onto your computer.
• You will have to create a docker account to download docker.
• Install docker by double-clicking on the executable your downloaded and follow instructions.

Docker commands

You are going to use the command-line interface to work with Docker.

docker images
– list out all the images in your computer

docker ps -a
– list out all the running containers on your computer

docker rmi imageId
– delete or remove an image.

docker stop containerId
– stop a running container

docker rm containerId
– delete a container

docker pull image: tag
– pull an image from a docker registry(docker hub or AWS ECR).

Run docker container automatically

Use these tags 

-dit --restart unless-stopped

docker run -p outside-port:internal-port –name container-name -dit –restart unless-stopped -d image_name:image_tag
– run docker container with the port where the container will use both externally and internally, the name of the container, the image, and tag being used, and a command to make sure the container will restart if it stops.

– -d means that to run container in background and print container ID

docker run -p outside-port:internal-port --name container-name -dit --restart unless-stopped -d image_name:image_tag

Push up a docker image to aws docker registry

1. Login to aws ECR from your computer

aws ecr get-login-password --profile folauk110

2. Build image

docker build -t project .

3. Tag image

docker tag project:latest remote-ecr-url/project:latest

4. Push image to remote registry

docker push remote-ecr-url/project:latest

SSH into a docker container

docker exec -it {container-name} sh

or

docker exec -it {container-name} sh /bin/bash

Install Redis using docker

Pull redis docker image

docker pull redis

Run redis docker container

docker run --name container-redis -dit --restart unless-stopped -p 6379:6379 -d redis

Set keys and values in redis

First, ssh into the redis container.

docker exec -it container-redis sh

Second, use the redis-cli

redis-cli

127.0.0.1:6379> set docker great
OK
127.0.0.1:6379> get docker
"great"
127.0.0.1:6379> set name objectrocket
OK
127.0.0.1:6379> get name
"objectrocket"

Install Elasticsearch using docker

Pull elasticsearch docker image

Make sure to use the right version that your code and Kibana is using.

docker pull docker.elastic.co/elasticsearch/elasticsearch:7.1.0

Run elasticsearch docker container

docker run -p 9200:9200 -p 9300:9300 --name elasticsearch -e "discovery.type=single-node" -dit --restart unless-stopped -d docker.elastic.co/elasticsearch/elasticsearch:7.1.0

-e ELASTIC_PASSWORD=MagicWord

docker run -p 9200:9200 -p 9300:9300 --name elasticsearch -e "discovery.type=single-node" -e ELASTIC_PASSWORD=DDloadjes233j -dit --restart unless-stopped -d docker.elastic.co/elasticsearch/elasticsearch:7.1.0

Install Kibana using docker

Pull kibana docker image

Make sure to use the right version that your code and elasticsearch is using.

docker pull docker.elastic.co/kibana/kibana:7.1.0

Run kibana docker container 

docker run --link elasticsearch:elasticsearch -dit --restart unless-stopped --name kibana -p 5601:5601 docker.elastic.co/kibana/kibana:7.1.0

Access kibana locally by going on http://localhost:5601/app/kibana

Add Elasticsearch Password

# add elasticsearch password
-e ELASTICSEARCH_PASSWORD=DDloadjes233j

Example
docker run --link elasticsearch:elasticsearch -e ELASTICSEARCH_PASSWORD=DDloadjes233j -dit --restart unless-stopped --name kibana -p 5601:5601 docker.elastic.co/kibana/kibana:7.1.0

Logstash

# pull image
docker pull docker.elastic.co/logstash/logstash:7.15.0

# run container
docker run -dit --restart unless-stopped --name logstash -v ~/pipeline/:/usr/share/logstash/pipeline/ docker.elastic.co/logstash/logstash:7.15.0

docker pull docker.elastic.co/logstash/logstash:7.15.0

Postgresql with docker

#pull image
docker pull postgres:12.6
#run docker container
docker run --name postgres --restart unless-stopped -p 5432:5432 -e POSTGRES_PASSWORD=test -v /Users/folaukaveinga/Software/postgres/data:/var/lib/postgresql/data -d postgres:12.6

Ubuntu with docker

Sometimes when you want to play or learn linux you want to have a linux OS to play with. With docker you can pull a ubuntu docker image and run it locally.

docker pull ubuntu

Run a ubuntu container

docker run -it ubuntu /bin/bash

You will be in the root folder of the ubuntu container right away after running the above command.

Restart a docker container

docker container restart [OPTIONS] CONTAINER [CONTAINER...]

// -t or --time represents seconds to wait for stop before killing the container
docker container restart -t 5 bee0a80b1424

View logs of a docker container

docker logs [OPTIONS] CONTAINER

// Follow log output -f or --follow
docker logs -f asdfwers

If you ever run multiple java projects (microservices) on eclipse. Most of the time you want to start them up all at the same time and luckily eclipse has this feature. Unfortunately what Eclipse doesn’t have is a way to stop or kill all of you java projects(processes) all at the same time. This is useful when you want fresh and clean instances for all my microservices and not have any process in a stale state.

To terminate all of your projects or java processes, do this:

• Open up terminal and type in this command “killall java”
• Or open terminal within your eclipse. Open Eclipse, right-click on a project in the Package Explorer panel, hover over Show in, select terminal, and type in this command “killall java”