Cheat Sheet
Docker useful commands.
If you have a Dockerfile similar to this one:
FROM nginx
COPY my-custom-script.sh /
ENTRYPOINT ["/my-custom-script.sh"]
# OR
# CMD /my-custom-script.sh
And after my-custom-script.sh exits, docker stops the container, you can fix the problem as follows.
Fist, make sure you are using COPY instead of ADD in your Dockerfile to copy your script.
Edit my-custom-script.sh and add the following line at the end:
...
# Run all command line arguments
exec "$@";
Then make sure to use a command when running your container, for example /bin/bash
docker run \
-tid \
-p 8080:8080 \
--name test \
my-custom-image \
/bin/bash
docker exec -ti CONTAINER-NAME-HERE /bin/bash
docker run \
-tid \
--name test \
-p 8080:8080 \
-e MY_VAR='MY-VALUE' \
nginx
docker run --rm -it -v /var/run/docker.sock:/var/run/docker.sock docker
Run your container with
--restart=always flag. Or add the the flag to an existing container:
docker update --restart=always <container>
docker attach CONTAINER-NAME
If you press CTRL+C to exit it will stop the container.
To exit without stopping the container press CTRL+P then CTRL+Q
docker commit CONTAINER-NAME NEW-IMAGE-NAME
docker build -t NEW-IMAGE-NAME .
Access your AWS console and go to EC2, AMIs. Find your AMI and check its Block Devices, for example:
/dev/sda1=snap-081e01478359d5bec:30:true:gp2
snap-081e01478359d5bec is the AMI snapshot ID, which will be used as the source for a new device.
In your AWS console go to Snapshots. Filter using your snapshot ID, for example: snap- 081e01478359d5bec.
Right click on it, then select Create Volume. Add a tag key Name and input your new volume’s name.
Launch a new instance or use an existing one.
Keep in mind the instance must have enough space to store a temporary tar le from your AMI volume.
In your AWS console go to Volumes. Filter by your Volume Name (you created previously).
Right click on it, then select Attach Volume.
Select your instance and choose a Device, for example: /dev/sdf
Click on Attach.
SSH connect to your instance and mount the volume you just created.
mount /dev/xvdf1 /mnt
Note your Device was renamed to /dev/xvdf
Install Docker in your instance.
SSH connect to your instance and mount the volume you just created.
tar -c -C /mnt/ . | docker import - YOUR-IMAGE-NAME
Replace YOUR-IMAGE-NAME
This command might take a while depending on the size of your volume.
List your docker images. Find YOUR-IMAGE-NAME and get its Image ID.
Run a container from your new image.
docker run -tid dd5935d36306 /bin/bash
If everything is OK you can umount your volume:
umount /mnt
Then go to your AWS Console, Volumes. Find the volume you created previously, right click on it then select Detach Volume. Then right click on it again then select Delete Volume.
docker rmi -f $(docker images -f "dangling=true" -q)
Or.. the
docker system prune command will remove all stopped containers, all dangling images, and all unused networks:docker system prune
docker run --rm -v /var/run/docker.sock:/var/run/docker.sock \
assaflavie/runlike YOUR-CONTAINER
docker inspect -f '{{ .Mounts }}' containerid
Last modified 1yr ago