Docker is old tech, yes, doesn't mean every dev in the world uses it. They don't. Jails/zones are even older (hell a chroot). Did developers all use those before due to them being 'old tech'. No.
Any reasonably big project uses docker because it's a very simple way to have the exact environment in both production and in dev. Also it is helpful for keeping things isolated. In all projects I've worked for the las ten years for several major companies, docker has been a requirement.
Any reasonably big project uses docker because it's a very simple way to have the exact environment in both production and in dev. Also it is helpful for keeping things isolated. In all projects I've worked for the las ten years for several major companies, docker has been a requirement.