On my postgresql docker image :

initdb: error: could not access directory "/home/postgres/pgdata/data": Permission denied

I reused a previous image

volumes:
  - pgsql_data:/data/pgsql
environment:
  PGDATA: /data/pgsql

So actions :

• start image without setting PGDATA, then execute :

Then :

docker exec myimage id # to check the user (here 1000:1000)
docker exec myimage ls -l /data/ # to check the mount directory
docker volume inspect pgsql_data # give the path of the volume
// update the rights 
chown 1000:1000 -R /home/docker/volumes/pgsql_data

• stop docker compose up pgsql
• restore PGDATA parameter
• restart docker compose up pgsql

Another docker command :

 docker cp <containerId>:/file/path/within/container /host/path/target

But can not use joker characters like "*"

Petit tutoriel éclairé sur l'init d'une base mongo sous docker

Flatten a docker container :
docker export <CONTAINER ID> | docker import - some-image-name:latest

plus intéressant : http://blog.loof.fr/2016/05/docker-cleanup.html

docker tag d583c3ac45fd myname/server:latest

Installation d'un plugin dans un docker sans internet

bin/plugin -u file:///your/zip/file/path -i mobz/elasticsearch-head

sudo docker exec -i -t loving_heisenberg bash

Docker behind proxy :

$ mkdir /etc/systemd/system/docker.service.d/
$ cat >/etc/systemd/system/docker.service.d/proxy.conf << EOF
[Service]
    Environment=HTTP_PROXY=http://myproxy:3128/
EOF
$ systemctl daemon-reload
$ systemctl restart docker.service