Photo Break – Flag City Balloon Fest

BalloonFestPano

Took the day off today to drive to Findlay for the annual Flag City Balloon Fest. I’ve attempted this trip several other times, but the weather didn’t cooperate. Today the sky was clear and blue, and about a dozen balloons were inflated for Media day. Unfortunately, the weather still didn’t cooperate. High winds several hundred feet up scrubbed the launch, and shortly after this shot the balloons were brought back down.

Interesting Docker Containers (and some tips on running them)

shipping-82339I’ve been learning how to use Docker for the last couple of months. Part of that experience has been downloading and working with various freely available containers from the Docker Hub. Since an ever increasing number applications are web based (i.e using a website as a UI tool) porting many open source projects to use Docker is becoming less complex. While not all open source applications can benefit yet from containerization, I think its only a matter of time before this technology starts to really gain in popularity.
My area of interest tends to fall more towards Business Intelligence and related technologies, so what I’ve been experimenting with are containers in that realm. This time around, I’ll discuss these containers and my experience getting them running on a native Docker installation on Ubuntu:
  • Rstudio
  • Cloudera Hadoop
  • ODOO with Postgresql

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Docker – Handy Tip for Frequent Command

containers-smallOne command I use a lot when working with Docker, is docker ps -a to see what containers I have and which ones are active. To save a little time when entering that command, create an alias in your BASH profile for that command.

  1. From a command prompt, change to your home folder: cd ~
  2. Edit the .profile file with a text editor. In my case, I use NANO: nano ./.profile
  3. Add this line to the end of the file:  alias dpa=”docker ps -a”
  4. Save the file with CTRL-O and exit back to a command prompt with CTRL-X.
  5. Logout and log back in.
  6. At a command prompt enter: dpa. You’ll see the results of docker ps -a but without all the typing!

Configure your Ubuntu Docker installation for remote access

containerThe default installation for Docker on Ubuntu server (16.04) configures the daemon (service) to listen on a local socket. But what if you want to access your Docker daemon remotely, from another box, If you are using the default configuration, you would need to open a Secure Shell to the server, and access Docker that way. But there is a way to setup Docker to allow remote access.

First, lets verify that Docker is only working with a local socket.  On the server,  run from this command line:

ls -l /run

The results show have an entry with the docker.sock entry like this:

dockersocket

And you can check that the daemon is not listening on any ports on your system by running this command:

sudo netstat -tlp

No Docker application should be listed in the results.

NoDocker_port

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