***This is part of an ongoing series I call "Mode 1 Storage Guy goes to a Mode 2 World." I'm not an expert (yet), YMMV.***
Let's say you need to see how a poker website looks from CentOS, but you have a windows box. What you do? Probably install hyper-v (or vmplayer), download a .iso image of CentOS, and create a new vm out of that ISO. Contained within that VM is every dll, every file, everything CentOS needs.
OK, let's say you invented a winning poker algorithm, and you want it to play 500 games of poker simultaneously. You don't have enough hard drive space for 500 vm's - but you have enough for 500 containers. So on that CentOS VM you install Docker and download 1 thin CentOS container image, and Docker knows what files on the CentOS VM each container needs to run. Docker makes it super easy to download an image in docker: docker pull
Now let's say you're making tons of money and want to get 10,000 containers playing poker. That many images won't fit in your computer - you need more computers. So you buy a bunch of windows computers, and on each you install hyper-v, get a CentOS VM up, and install docker. You have your 10,000 poker games running...but one computer dies, taking down the VM and 500 containers with it. You lose all the chips you had in those 500 games. What's more, people are starting to copy your algorithm, and you start losing! You improve your algorithm, but how can you change the 9,500 containers in time?
So you cluster all your computers with hyper-v. Good first step. And then install OpenShift on all the CentOS VMs. Now when a server dies, OpenShift is replicating each container to another VM and you don't lose the poker game. What's more, every time you update the algorithm, you can use docker to create a new image and have OpenShift deploy it in place of the old algorithm container after each poker game.
Let's say you need to see how a poker website looks from CentOS, but you have a windows box. What you do? Probably install hyper-v (or vmplayer), download a .iso image of CentOS, and create a new vm out of that ISO. Contained within that VM is every dll, every file, everything CentOS needs.
OK, let's say you invented a winning poker algorithm, and you want it to play 500 games of poker simultaneously. You don't have enough hard drive space for 500 vm's - but you have enough for 500 containers. So on that CentOS VM you install Docker and download 1 thin CentOS container image, and Docker knows what files on the CentOS VM each container needs to run. Docker makes it super easy to download an image in docker: docker pull
Now let's say you're making tons of money and want to get 10,000 containers playing poker. That many images won't fit in your computer - you need more computers. So you buy a bunch of windows computers, and on each you install hyper-v, get a CentOS VM up, and install docker. You have your 10,000 poker games running...but one computer dies, taking down the VM and 500 containers with it. You lose all the chips you had in those 500 games. What's more, people are starting to copy your algorithm, and you start losing! You improve your algorithm, but how can you change the 9,500 containers in time?
So you cluster all your computers with hyper-v. Good first step. And then install OpenShift on all the CentOS VMs. Now when a server dies, OpenShift is replicating each container to another VM and you don't lose the poker game. What's more, every time you update the algorithm, you can use docker to create a new image and have OpenShift deploy it in place of the old algorithm container after each poker game.
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