The container is allow a device have some mechine on it. Different from virtual mechine that have to install OS into it, but container doesn't need that. The container use OS default from their host (our laptop). For instance, if you have windows in your device, then the container is use windows as well.
Docker is container manager. It is free and Open Source application and it is released in 2013. Docker have UI to allow manage container easily.
docker image ls to show list image.
docker pull nameimage:tag to download docker image. Default tag will set in latest. Once yo have downloaded image, docker will not download again.
docekr image rm nameimage:latest to remove docker image
Docker is place to store docker image. Docker image that have stored in docker registry, can be used by docker demon.
Kind of docker registry:
- Docker Hub : https://hub.docker.com/
- Digital Ocean Container Registry : https://www.digitalocean.com/products/container-registry/
- Google Cloud Container Registry : https://cloud.google.com/container-registry
- Amazon Elastic Container Registry : https://aws.amazon.com/id/ecr/
- Azure Container Registry : https://azure.microsoft.com/en-us/services/container-registry/
One docker image can be used to create some container on condition that you create different name of container. Once you have installed container, the image cannot be removed. When you want to remove the image, you have to remove the container first.
Status container in default is not running. When you want to run containe, you have to start the container. To get list of container in Docker Daemond you can commit this task docker container ls -a. You can also show only list container is running run this command docker container ls.
To create container you can run docker container create --name namecontainer image:redis. When it is created you can get the container ID. When you create container while the image is not available. Docker will download the image automatically.
Next, we can run the container in this command docker container start containerID/namecontainer. When you run docker container ls, it show the contohregis container is running. Run docker container stop contohredis to stop container and status contohredis in docker container ls -a will set *Exited. You can see log the container run this command docker container logs -f connectorid/namecontainer
When you want to remove container, you can run docker container rm namecontainer then check list of container docker container ls -a to ensure that the container is remove.