How many containers should I run on the 5$/m droplet ?

May 12, 2015 2.3k views
Docker Ghost Ubuntu

I'm just getting started with docker, I created my first droplet (via the Docker pre-built set-up) and have pointed two domain names to the droplet's IP.

The first domain would be my personal site to play around with, so I would like to test different images/blogs etc. - for the moment I will set it up with Ghost using the official Docker Ghost image.
The second domain will contain 2 sub-sites for my other half and her sister to create a simple portfolio/blog site... for the moment with Ghost but I will possibly switch to Wordpress as it's easier for an end-user.

Therefore, I plan to have at least 3 "portfolio" sites running 3 Ghost images or 1x Ghost + 2x Wordpress.

After checking just the 3 Ghost images running, alongside Nginx image and Docker-Gen - I seem to use 95% memory, I suppose it's normal but I don't know of any ways to test load.

Will I be able to run other sub-sites from the second domain?

Also what is a good set-up for dockerfiles and directories for each site ? I figured I would follow:

With a docker and site folder inside, like so:

/srv/danlemon/site/<other-ghost files>

Although I'm still trying to wrap my head around how a Data Container works, I need an easy way to login and update or tweak files like adding a new theme or plugin to ghost.

Thanks in advance!

2 Answers

Hi -

I actually found running more than one Docker container (I am running a WordPress stack in a container) on the $5.00 droplet too heavy.

In fact, I was getting PhP memory errors even running one big WordPress-based Docker container on a $5 droplet, so I upped my host for the container to the $10 a month, 1 Gig droplet.

I realize Ghost is much lighter than WordPress so you may get away with running 2 maximum per $5 droplet, I would hazard to guess.

What I had tried in the past, which did work, was running 3 WordPress droplets off of on $10 droplet - that worked.

To do the DNS stuff was tricky, but I got it working, as recounted in an article I wrote on my blog about the process:

The Backend for the Uninitiated

Hope that helps/and to continue on this thread as I feel it is important too...


any quantity you want
just mount a swap to stretch 512 memory limit

Have another answer? Share your knowledge.