docker

# skip entry point and go directly to the shell with --entrypoint
docker run -it --rm --name goalpinebuild -v $(pwd)/../src:/in -v $(pwd)/../dockerleanalpineproduction:/out -v $(pwd):/work -e BUILDARGS="-ldflags \"-extldflags '-static'\" -o /out/ps-737migration-be" --entrypoint=/bin/sh goalpinebuild 

# in docker run, ALWAYS PUT THE IMAGE NAME AT THE END, arguments after the image name are discarded!
sudo docker run --network=bridge -p 80:80 gowebapp

# update a single service in a docker compose composition
docker-compose up -d --no-deps --build <service_name>

# install docker-compose.yml as container with [dcsg](https://github.com/andreaskoch/dcsg/blob/develop/installer.go)
sudo dcsg install ./docker-compose.yml 
sudo nano /etc/systemd/system/MYSERVICE.service  # remove docker pull
sudo systemctl daemon-reload
sudo service MYSERVICE start

# allow the containers to connect to the host
# in host:
sudo sysctl -w net.ipv4.ip_forward=1
# in docker-compose:
     network_mode: bridge
     extra_hosts:
        - "thehost:172.17.0.1"

# setup postfix in docker host:
# add the docker0 network to mynetworks in /etc/postfix/main.cf
mynetworks = **172.17.0.0/24** 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
# remove $mydomain and any other domains for which mail needs to be forwarded to the external relay server:
mydestination = $myhostname, $mydomain, example.com, localhost
# allow access to port 25 from the docker network:
sudo ufw allow from 172.17.0.0/24 to any port 25
# add the docker host public fqdn to the SPF record
# after installation of postfix run
sudo cp /etc/resolv.cnf /var/spool/postfix/etc/
sudo service postfix restart

# view pending / deferred mails:
postqueue -p
# retry mails
postqueue -f

# trap sigterm in docker run script:
# http://veithen.github.io/2014/11/16/sigterm-propagation.html

# save docker image as tar file:
docker save -o <save image to path> <image name>

# Transferring a Docker image via SSH, bzipping the content on the fly:
docker save <image> | bzip2 | pv | \
     ssh user@host 'bunzip2 | docker load'

# dump running or paused container (including changes not in the image)
docker export CONTAINER_ID > my_container.tar

# to do this in reverse (remote to local): 
ssh target_server 'docker save image:latest | bzip2' | pv | bunzip2 | docker load 
     
# load docker image:
docker load -i <path to image tar file>

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

# copy files between host and container:
docker cp foo.txt mycontainer:/foo.txt
docker cp mycontainer:/foo.txt foo.txt

mailserver startte niet op omdat /var/log niet gemapped was => oplossing: ./log met 777 mappen als volume voor /var/log

# show all containers
docker ps -a
docker ps --filter "status=exited"

# delete all containers
docker rm $(docker ps -a -q)

# delete all untagged images
docker rmi $(docker images | grep "^<none>" | awk "{print $3}")

docker rmi /roundcubemail
docker run --rm -P --name myfirstpostgres -e POSTGRES_PASSWORD=MYPASSWORD postgres

connect to postgres in docker (find port numer with docker ps)
psql -h localhost -p 32768 -d postgres -U postgres --password

docker network ls
docker network connect bridge mail
docker network inspect bridge

# koppel 2 docker-compose networks aan elkaar:
https://blog.virtualzone.de/2016/09/docker-compose-link-containers-outside-compose-file-using-external_links.html

# networking with compose 
https://docs.docker.com/compose/networking/

# build image
docker build -t myimagename .

# build compose
docker-compose up
docker-compose up -d # build and run as deamon
docker-compose stop

# run docker compose with interactive shell
docker-compose run --rm mail

execute bash on a running container
docker exec -ti mail /bin/bash

add account to postfix:
docker run --rm \
  -e MAIL_USER=MYUSER \
  -e MAIL_PASS=MYPASSWORD \
  -ti tvial/docker-mailserver:latest \
  /bin/sh -c 'echo "$MAIL_USER|$(doveadm pw -s SHA512-CRYPT -u $MAIL_USER -p $MAIL_PASS)"' >> config/postfix-accounts.cf

docker run --rm -P --name myfirstpostgres -e POSTGRES_PASSWORD=ZEPASSWORD postgres