Docker commands

Docker cli commands

command	docker images
Provides	Image Tag name ,Image     id,date created and size

To identify,what containers running on the server:

command	docker ps
Provides	Containerid,Ports,Names,date created,Status of container

How to start/stop and remove the container:

Mode	Description	command
Start	After deploying the container in to the box, it is specified with the help of ID(that is the container id)	docker start containerid
Stop	If you want to remove/stop the container you have to do this stop command ,before removing the container.	docker stop containerid
remove	to remove the container	docker rm containerid

Note:Inside the box, we have always two containers running,but one container,please make sure at any cost Ecs-agent container /image should not be removed.



Execute an interactive bash shell on the container:

command	Description
docker exec -it containerid /bin/bash	which provides all the information related to the application and other basic stuff and help us to view the container through bash shell.

Please ensure that,when you use the above command,the docker container should be in running state.


Troubleshooting and logs

Application logs

Command	docker logs containerid
Provides	The status of the application that we are running on the container.

ECS logs 

Directory Path	var/log/ecs
Provides	Taskdefinition name & number Task information Image information with Tag name

Directory Path	/var/lib/ecs/data (complete information in the JSON format).
Provides	container definition metrics (Image,Port,version,NODE_ENV the complete stuff used for the container to build).

Docker logs

Directory Path	/var/lib/docker
Provides	Image,container,network,overlay,tmp,volumes and storage drivers.

To know the ipaddress of a specific container:

docker inspect container name | grep '"IPAddress"' | head -n

This is another way to copy files into an image. The -v option temporarily creates a volume that us used during the build process.

docker build -t  {image name }   -v  {host directory} : {temp build directory}   .