> then freezing that container into an immutable, portable unit of deployment.
Doesn't doing that make a git repo of all the files currently in the container? Wouldn't it take ages to upload this to your machine, versus just uploading a dockerfile and having it rebuild the image from scratch?
I get that Docker containers are sort-of VMs, but I don't really understand the freeezing functionality at the moment... It seems to me that you'd have to freeze the entire binary image, whereas an ansible script/Docker build file would be much more portable and result in the same thing.
Ah, errnoh on IRC also explained some things to me, it seems that Docker reuses "parent" images, so if you launch 10 Ubuntu containers they will only take up 10x20mb plus the parent image of 600 mb, rather than 10x600, hence the freezing.
That's amazing, it means that I can replace my small VMs with Docker containers on a big box.
Doesn't doing that make a git repo of all the files currently in the container? Wouldn't it take ages to upload this to your machine, versus just uploading a dockerfile and having it rebuild the image from scratch?
I get that Docker containers are sort-of VMs, but I don't really understand the freeezing functionality at the moment... It seems to me that you'd have to freeze the entire binary image, whereas an ansible script/Docker build file would be much more portable and result in the same thing.