Docker containers can't run on LXC (_NOT LXD_)

nobody · April 27, 2020, 11:23am

lxc/lxd/blob/master/doc/database.md

# Database

## Introduction
So first of all, why a database?

Rather than keeping the configuration and state within each instance's
directory as is traditionally done by LXC, LXD has an internal database
which stores all of that information. This allows very quick queries
against all instances configuration.


An example is the rather obvious question "what instances are using br0?".
To answer that question without a database, LXD would have to iterate
through every single instance, load and parse its configuration and
then look at what network devices are defined in there.

While that may be quick with a few instance, imagine how many
filesystem access would be required for 2000 instances. Instead with a
database, it's only a matter of accessing the already cached database
with a pretty simple query.

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Ok, lxc launch images:centos/7/amd64 centos7-5 so where i can find now config of this container?
If i create container with lxc-create -t download -n centos7-4 -B lvm --vgname vg1 --fssize 5G --fstype ext4 -- -d centos -r 7 -a amd64 i am quite sure exactly, there is stateful /var/lib/lxc/centos7-4/config who can be managed with Puppet or something else. So, i don’t need to create containers with YAML like this lxc launch images:centos/7/amd64 centos7-5 < my_config.yaml , i need to have stateful config of that container

P.S. also, see Change containers config storage on LXD