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Sharing Docker directory to another container – sidecar appraoch

Problem

User wants to user create sidecar style storage

  • Benefits to make the docker as portable as possible

Create your first container
Create a file Dockerfile.storage with the following contents

FROM ubuntu:latest

RUN apt update && apt install openssh-server sudo -y
RUN useradd -rm -d /home/ubuntu -s /bin/bash -g root -G sudo -u 1000 test
RUN echo ‘test:test’ | chpasswd
RUN service ssh start
RUN mkdir -p /var/storage

EXPOSE 22
CMD [“/usr/sbin/sshd”,”-D”]

Build first container

sudo docker build -t storage -f Dockerfile.storage .

Run your container

sudo docker run -d -p 2222:22 storage -v /var/storage

Note

Parameter “-v /var/storage” expose this out as volume for another container

 

 Create Second Container with NGINX 
## Create a file Dockerfile.nginx with the following contents

FROM ubuntu:latest

## Install nginx
RUN \
add-apt-repository -y ppa:nginx/stable && \
apt-get update && \
apt-get install -y nginx && \
rm -rf /var/lib/apt/lists/* && \
echo “\ndaemon off;” >> /etc/nginx/nginx.conf && \
chown -R www-data:www-data /var/lib/nginx

# Define mount directories.
VOLUME [“/etc/nginx/sites-enabled”, “/etc/nginx/certs”, “/etc/nginx/conf.d”, “/var/log/nginx”, “/var/www/html”]

# Define working directory.
WORKDIR /etc/nginx

# Define default command.
CMD [“nginx”]

# Expose ports.
EXPOSE 80
EXPOSE 443

Build Docker nginx container
sudo docker build -t nginx -f Dockerfile.nginx .

 

Run your container

sudo docker run -d –volumes-from storage —env TAGS=“nginx” nginx

Note
“–volumes-from app_x” option mount data volumes from container “storage” and binds it into “nginx” container.
Files generated by “storage” in these directories will also be accessible to “nginx” container.

Mount without directories just for test nginx
docker run -d -p 80:80 nginx

Mount with directories from Docker Machine
docker run -d -p 80:80 -v <sites-enabled-dir>:/etc/nginx/conf.d -v <certs-dir>:/etc/nginx/certs -v <log-dir>:/var/log/nginx -v <html-dir>:/var/www/html nginx

Another example with Network Sharing between containers

This assumes you already have containers  you wants to share network

Start rabbitMQ

docker run -d -e RABBITMQ_NODENAME=my-rabbit –name my-rabbit -p 9419:9419 rabbitmq:3-management

Start rabbitmq_exporter in container.

docker run -d –net=container:my-rabbit kbudde/rabbitmq-exporter

 

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