Containers vs. Zones vs. Jails vs. VMs (2017)

Post by takeda » Wed, Apr 08, 2020, 6:22 AM UTC

MuffinFlavored wrote: post #129

wmf wrote: post #36

Earlier quoted context omitted.

No. Docker volumes aka bind mounts have little or no overhead. You don't want to run a database in an ephemeral "cattle" container without some kind of HA because you'd lose data.

docker run --rm \ --name postgresql \ -e POSTGRES_PASSWORD=postgres \ -d \ -p 5432:5432 \ --cpuset-cpus="0-1" \ --cpus 2.0 \ -m=1024m \ --mount type=bind,source=$HOME/docker/volumes/postgres,target=/var/lib/postgresql/data \ postgres:12.2 native results on a digitalocean VM: $ pgbench -c 100 -j 2 -T 60 postgres starting vacuum...end. transaction type: scaling factor: 1 query mode: simple number of clients: 100 number…

Post by cle » Wed, Apr 08, 2020, 8:02 PM UTC

tyingq wrote: post #127

cle wrote: post #76

Earlier quoted context omitted.

The gap is that it's skipping half of what makes Docker powerful, and what isn't really discussed in this conversation at all either. Distribution. E.g. see this line of code: https://github.com/p8952/bocker/blob/master/bocker#L25 "But I thought bocker implements Docker?" It doesn't, it only attempts to implement the "Docker daemon" part, and piggy-backs on Docker registries for image distribution. This is a huge par…

I'd argue that bocker makes that more clear. It takes away any idea that the magic is in the containers. To the degree that it is, Linux provides that...not Docker. It helps focus on what Docker does provide, as you mention.