boot2docker cannot cd into a directory

Let's say you are running your server using:

docker-compose up

You may be trying to run bash for your container,

docker ps (grab the container id)
docker exec -it 301 bash

When you cd into a mounted host volume, if you get a "killed" message or it just logs you out, try the following:

boot2docker restart

docker - error fetching ubuntu packages

If you ever see the following error and you are using boot2docker, run "boot2docker restart"

E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/libe/libevent/libevent-2.0-5_2.0.21-stable-1ubuntu1.14.04.1_amd64.deb  Could not resolve 'archive.ubuntu.com'

E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/m/memcached/memcached_1.4.14-0ubuntu9_amd64.deb  Could not resolve 'archive.ubuntu.com'

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

Docker container cannot access mounted volumes in OSX host

If you are running Nginx or Apache in your docker images while using those to write files (ex. cache) on the host machine, chances are you will get a permission error.

Bash into your container:

> docker-compose run bash

cd into the location that has your mounted volume and do a "ls -l", you may see the following:

drwxr-xr-x 1 1000 staff 646 Jun 15 03:39 app

In Nginx or Apache, the user is usually www-data. We need to associate www-data with the UID 1000.

In your Dockerfile, add the following:

> RUN usermod -u 1000 www-data

Now if you check the permission again, you would see the correct user.

drwxr-xr-x 1 www-data staff 646 Jun 15 03:39 app

Create your own Docker Registry with S3

The purpose of this post is to be able to deploy your own custom image to ElasticBeanstalk using docker registry through storing the images on Amazon S3.

Let's begin by cloning Docker Registry 2.0.

git clone https://github.com/docker/distribution.git

Generate self-signed certificates.

cd distribution
mkdir certs
openssl req \
         -newkey rsa:2048 -nodes -keyout certs/domain.key \
         -x509 -days 365 -out certs/domain.crt

Add TLS to config.yml

vi ./cmd/registry/config.yml

Add the tls block to the http section like the following:

http:

    addr: :5000

    secret: asecretforlocaldevelopment

    debug:

        addr: localhost:5001

    tls: 

        certificate: /go/src/github.com/docker/distribution/certs/domain.crt

        key: /go/src/github.com/docker/distribution/certs/domain.key

Remove filesystem settings and use AWS s3 as repository storage:

storage:
   #filesystem:
   #        rootdirectory: /tmp/registry
   s3:
      accesskey: awsaccesskey
      secretkey: awssecretkey
      region: us-west-1
      bucket: bucketname
      encrypt: true
      secure: true
      v4auth: true
      chunksize: 5242880
      rootdirectory: /s3/object/name/prefix

Settings: http://docs.docker.com/registry/configuration/#storage

Save this.

Build the image with a name (ex. docker_registry)

> docker build -t docker_registry .

Tag it. Note that I am using boot2docker on MacOSX. You can get your IP address by running "boot2docker ip".

> docker tag docker_registry:latest 192.168.59.103:5000/docker_registry:latest

Run the registry.

> docker run -p 5000:5000 docker_registry

If you try to push your an image, you will get a error saying you need to add an insecure registry.

> boot2docker ssh "echo $'EXTRA_ARGS=\"--insecure-registry 192.168.59.103:5000\"' | sudo tee -a /var/lib/boot2docker/profile && sudo /etc/init.d/docker restart"

Push an image:

> docker push 192.168.59.103:5000/{image}

boot2docker in terminal MacOSX

Initialize boot2docker

> boot2docker init

Start boot2docker

> boot2docker start

Set the environment variables in the current terminal.

> eval "$(boot2docker shellinit)"

Test run

> docker run hello-world

To run an Nginx server (-d for running in background):

> docker run -d -P --name web nginx

Stop

> boot2docker stop

Check status

> boot2docker status

Built an image:

> docker build -t .

Access home folder:

> cd $HOME

Mount a local directory to the image's directory

echo "my new site" > index.html
> docker run -d -P -v $HOME/site:/usr/share/nginx/html --name mysite nginx

upgrade boot2docker

> boot2docker stop
> boot2docker upgrade