Tag: raspbian

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Updating/installing node.js on the Raspberry Pi

The latest versions of Raspbian (e.g. Jessie) come with an older version of node.js preinstalled. If you search around for how to install node.js on the Pi you’ll find a number of different approaches, as it seems there’s not an official ARM compiled version of the latest releases in the Debian repos.

This approach provided by this project has later versions compiled for ARM. Follow the instructions on their site to download and install from the .deb file.

Before you start, if you already have an older version installed (check ‘node -v’), uninstall it first. The version I had on my fresh Jessie install was from nodejs-legacy, so ‘sudo apt-get remove nodejs-legacy’ did the trick.

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Docker Swarm node set up with Docker 1.12 RC on Raspberry Pi

I’ve been following through the steps in this article to set up a Docker swarm cluster on a pair of Raspberry Pis. Most of the steps work as-is from Mac OS, but for a few steps there’s a couple of variations.

This is most likely going to be part 1 of a few posts as I work through and get this working.

For example, to copy your ssh key to the Pis, instead of:

ssh-copy-id pirate@pi3.local

… you can do (from tip here):

cat ~/.ssh/id_rsa.pub | ssh user@machine "mkdir ~/.ssh; cat >> ~/.ssh/authorized_keys"

To switch between remote hosts:

eval $(docker-machine env pi1)

where pi1 is the name of the remote host.

To switch back to the localhost (not entirely obvious but found the answer here):

eval "$(docker-machine env -u)"

After ‘swarm init’ and adding the other nodes to the cluster, ‘docker swarm ls’ lists the nodes in the cluster:

More to come in part 2:-)

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Configuring a static IP on HypriotOS for the Raspberry Pi

How you configure a static IP on the Pi changed between Wheezy and Jessie, and it seems on Hypriot’s prebuilt images for running Docker on the Pi, it’s a slight variation.

Edit /etc/network/interfaces.d/eth0, comment out the DHCP line:

iface eth0 inet dhcp

and add:

iface eth0 inet static
address your-static-ip
gateway your-gateway-ip
#google dns servers
domain_name_servers=8.8.8.8, 8.8.4.4

Done!

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Docker 1.12 RC on the Raspberry Pi

If you’re excited about playing with the swarm mode in the new 1.12 version of Docker, you can download the release candidates for Linux, Windows, Mac, but it’s not obvious where you can get an ARM compatible version to run on the Raspberry Pi.

The awesome guys over at Hypriot talk about running the 1.12 RC on the Pi, but their prebuilt OS images for the Pi don’t yet include the 1.12 RC version. I found this blog post however, which mentions a download location where you can pick up a .deb file and install it on the Pi with dpkg.

Downloaded, installed on my “to be” Pi cluster of 2 Pis, and up and running! Now to deploy something with swarm 🙂

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