Docker

docker tutorial

https://www.digitalocean.com/community/tags/docker?type=tutorials

install on ubuntu 14.04

install docker on ubuntu 14.04

https://www.digitalocean.com/community/tutorials/how-to-run-nginx-in-a-docker-container-on-ubuntu-14-04

sudo curl -sSL https://get.docker.com/ | sh

sudo service docker start

or

/etc/init.d/docker start

sudo docker run hello-world
sudo docker start nostalgic_hopper
sudo docker ps -a
sudo docker rm nostalgic_hopper
sudo docker pull nginx
sudo docker run --name docker-nginx -p 80:80 nginx

http://127.0.0.1/

sudo docker rm docker-nginx
sudo docker run --name docker-nginx -p 80:80 -d nginx
sudo docker stop docker-nginx
sudo docker rm docker-nginx
sudo docker run --name docker-nginx -p 80:80 -d -v ~/docker-nginx/html:/usr/share/nginx/html nginx
sudo docker stop docker-nginx
sudo docker rm docker-nginx
sudo docker run --name docker-nginx -p 80:80 -v ~/docker-nginx/html:/usr/share/nginx/html -v ~/docker-nginx/default.conf:/etc/nginx/conf.d/default.conf -d nginx
sudo docker restart docker-nginx
sudo docker stop docker-nginx
sudo docker rm docker-nginx
sudo service docker stop

usefull commands

Show local images

 docker images

rum image

sudo docker run hello-world

Don’t truncate ps output

docker ps -a --no-trunc

docker connect to running container https://askubuntu.com/questions/505506/how-to-get-bash-or-ssh-into-a-running-container-in-background-mode

display container output

docker logs -f container-name

find docker container ip and muck more

docker inspect <container id>

Run command on running docker

docker exec -it steemit/steem ls
docker exec -it 27831be92930 ls

no full run only prompt

docker run  -p 6789:6789 -it steemit/steem /bin/bash

rename image

docker tag 0e5574283393 fedora/httpd:version1.0

remove image

docker images

docker rmi node

Error conflict: unable to delete (must be forced) - image is referenced in multiple repositories

It will delete all images!

docker rmi cf52a8a6d919 -f

error: image has dependent child images

https://stackoverflow.com/questions/36584122/docker-how-can-i-get-the-list-of-dependent-child-images

docker rmi c39664f3d4e5

docker inspect --format='תבנית:.Id תבנית:.Parent' $(docker images --filter since=c39664f3d4e5 -q)

docker image config file

https://dantehranian.wordpress.com/2015/03/25/how-should-i-get-application-configuration-into-my-docker-containers/

hub images

https://hub.docker.com/r/mah454/vtiger/

docker run -d --name="vtiger" -h vtiger -p 8080:80 -p 2122:22 mah454/vtiger "/run.sh"

ip_address=$(docker inspect --format 'תבנית:.NetworkSettings.IPAddress' vtiger)
ssh -l root $ip_address -p 22

• http://localhost:8080/
• http://localhost:8080/phpmyadmin/

Build your own images

https://docs.docker.com/engine/tutorials/dockerimages/

containers

remove container

ps -a
docker rm name

restart an existing container after it exited

docker start  `docker ps -q -l` # restart it in the background
docker attach `docker ps -q -l` # reattach the terminal & stdin

-l, --latest          Show the latest created container (includes all states)
-q, --quiet           Only display numeric IDs

docker attach name

http://stackoverflow.com/questions/21928691/how-to-continue-a-docker-which-is-exited

copy docker container to another machine

copy docker container to other machene

https://blog.giantswarm.io/moving-docker-container-images-around/

docker container vs image

To use a programming metaphor, if an image is a class, then a container is an instance of a class—a runtime object

docker host access container files

https://forums.docker.com/t/access-docker-container-files/28906/9

df from root to find the path!

where docker images stored on the host machine

linux docker location

http://stackoverflow.com/questions/19234831/where-are-docker-images-stored-on-the-host-machine

du -hs /var/lib/docker/aufs/*

/etc/docker /etc/apparmor.d/docker /etc/apparmor.d/cache/docker

/var/lib/docker/aufs/diff/<id> has the file contents of the images. /var/lib/docker/repositories-aufs is a JSON file containing local image information. This can be viewed with the command:

docker images

delete docker container log

https://serverfault.com/questions/637996/clearing-deleting-docker-logs

 cp /dev/null  /home2/docker/containers/adfe42f86afd887bfe29f94e83df646746ddd5e6d3c3ac08f8dcd3713eb1024b/adfe42f86afd887bfe29f94e83df646746ddd5e6d3c3ac08f8dcd3713eb1024b-json.log

move docker disk location

move docker images

https://forums.docker.com/t/how-do-i-change-the-docker-image-installation-directory/1169

ps faux | grep docker
sudo service docker stop
ps faux | grep docker
mv /var/lib/docker /home2/

#ln -s /home2/docker /var/lib/docker 

or

vim /etc/default/docker

add file with the -g option: DOCKER_OPTS="-dns 8.8.8.8 -dns 8.8.4.4 -g /home2/docker"

sudo service docker start

now when I run

docker ps

I have no containers

docker ps -a

work fine

Install Docker on centos7

sudo systemctl start docker

troubleshooting

log file

df

/.../.../docker/containers/adfe42f86afd887bfe29f94e83df646746ddd5e6d3c3ac08f8dcd3713eb1024b/adfe42f86afd887bfe29f94e83df646746ddd5e6d3c3ac08f8dcd3713eb1024b-json.log

fail to run The container name "yxz" is already in use by container

docker ps -a
docker start xyz
docker attach xyz