Docker - kanuku/misc GitHub Wiki

Linking containers

##### See how much space your docker container is using
sudo du -d 2 -h /var/lib/docker/devicemapper | grep `docker inspect -f "{{.Id}}" fashion-advice-master`

Mounts /tmp/jenkins folder from the host machine to /var/jenkins_home on the host machine.

docker run -it  -v /tmp/jenkins:/var/jenkins_home busybox

#### Removes the current image
rm .boot2docker/boot2docker.iso

#### To log into the container
docker exec -it <container_name> bash
# Or
docker run -i -t -entrypoint="/bin/bash" postgres

#### To see the loggings
docker logs <containername>

#### Extracting image name from docker container

docker inspect --format "{{ .Config.Image }}" container name

##### Find out which docker version created the image
docker run jenkins cat /etc/lsb-release

How to upgrade

# Upgrading docker to latest release
 wget -qO- https://get.docker.com/ | sh

Known problems

Errors with device mapper when building without aufs

# I switched from the default 'devicemapper' driver to 'aufs' and so far, no more problems..
sudo apt-get install linux-image-extra-$(uname -r) aufs-tools
sudo service docker restart

# @ahromis @kytwb you should try using aufs and see if it clears it up for you. 
# Would be good to have more data points on this..

Insecure registry

Info from here

For Docker 1.3.1 and later, docker push to this development registry 
may fail without SSL certificate support. Restart docker with an 
--insecure-registry flag.

For boot2docker 1.3.1 for example, add 
EXTRA_ARGS="--insecure-registry 192.168.59.103:5000" to 
/var/lib/boot2docker/profile and restart docker with sudo 
/etc/init.d/docker restart.

Certificate gets invalidated for certain IP

solution from here


$ docker ps
An error occurred trying to connect: Get https://192.168.59.103:2376/v1.19/images/json: x509: certificate is valid for 127.0.0.1, 10.0.2.15, not 192.168.59.103

## Fix it with
$ boot2docker ssh 'sudo /etc/init.d/docker restart'

ssh -i cd-jenkinses.pem [email protected]

How to remove all old containers

# Containers older than one week shall be removed
docker ps -a | grep 'Exited' | grep 'weeks ago' | awk '{print $1}' | xargs --no-run-if-empty docker rm

How to create image for java application

FROM openjdk:11-jre-slim

VOLUME /tmp

EXPOSE 8080

ARG JAR_FILE=target/my-service.jar
#OR  ARG JAR_FILE=target/my-service-*.jar

ADD ${JAR_FILE} service.jar

CMD java $JVM_OPTS -jar /service.jar
Dockerfile (END)