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Docker Cheatsheet
Raw
docker-tips.md

Docker Cheatsheet

Glossary

Container
Single unit of computing.
Task
A docker container running a command.
Service
Many containers performing the same task.
Swarm
A cluster (many servers) distributing services amongst themselves.
Stack
A group of interrelated services that share dependencies, and can be orchestrated and scaled together

Cheatsheet

Build Container Image

docker build <container_image_name> .

Start Container (in foreground)

docker run -it <container_image_name:tag>

Start Container with Environment Variables

docker run -e MYENVVAR=foo <container_image_name:tag>

Or, the following is effectively equal to -e MYENVVAR=$MYENVVAR:

docker run -e MYENVVAR <container_image_name:tag>

Start Container with Environment Variables from EnvFile

docker run -it --env-file <path/to/envfile> <container_image_name:tag>

Start Container (in background)

docker run -d <container_image_name:tag>

List Running Containers

docker container ls

List Running Containers (IDs only)

docker container ls -q

List Most Recently Created Running Container

docker container ls -l

Stop Most Recently Created Running Container

docker container stop $(docker container ls -ql)

Execute a Command in a Running Container

docker exec -it <container_id> ipython

Deploy Stack

docker stack deploy -c docker-compose.yml <stack_name>

Execute a Command within a Stack Service

docker-compose -f docker-compose.yml run <service_name> <cmd>

Get Stack Service Logs

docker service logs <stack_name>_<service_name>

docker service logs cadasta-async_export-worker

Dockerfile

Healthchecks

It is strongly recommended for every Dockerfile to make use of the HEALTHCHECK directive to ensure that malfunctioning containers can be detected and handled.

Raw
ecs-tips.md

Amazon ECS Cheatsheet

Glossary

Cluster
A grouping of AWS EC2 instances (referred to as "container instances") that are running the ECS agent. Analagous to a "Swarm" in Docker speak.
Task Definition
A prototype for running a collection of interrelated services (services is referring to the Docker definition of services). Analagous to a "Stack" in Docker speak. Using the ecs-cli, a developer can create Task Definitions from a docker-compose.yml file. Example: 
{
  "containerDefinitions": [
    {
      "name": "wordpress",
      "links": [
        "mysql"
      ],
      "image": "wordpress",
      "essential": true,
      "portMappings": [
        {
          "containerPort": 80,
          "hostPort": 80
        }
      ],
      "memory": 500,
      "cpu": 10
    },
    {
      "environment": [
        {
          "name": "MYSQL_ROOT_PASSWORD",
          "value": "password"
        }
      ],
      "name": "mysql",
      "image": "mysql",
      "cpu": 10,
      "memory": 500,
      "essential": true
    }
 ],
 "family": "wordpress"
}
Service
A long-running task. ECS will maintain a required number of instances running the service and route traffic to services via the AWS Elastic Load Balancing service. Example: 
{     
  "cluster": "Wordpress",     
  "serviceName": "wordpress",     
  "taskDefinition": "wordpress:1",     
  "loadBalancers":[],     
  "desiredCount": 1,     
}

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