mjhjmtu

I'm trying to create additional interface with preconfigured static IP.

So I added configuration into /etc/network/interfaces

auto eth88
iface eth88 inet static
 address 10.10.0.1
 netmask 255.255.255.0

And trying to up it with:

ip link set dev eth88 up

As a result I've got: "Cannot find device eth88"

In some articles I've read that interfaces represent physical devices (nic?). But I have some docker0 interface created by docker. Should I create somewhere virtual device to enable my interface?

A network interface is always backed by some kernel module or similar part of the kernel that represents something, be it a physical interface, or some virtual interface that in some way talks to other interfaces. There are also dummy interface that don't do anything; you can assign an IP address to them, but it very likely won't do what you want to achieve.

In general, you can add new interfaces with a variant of ip link add ... type .... See man ip-link for details and a list of types.

You can also add several IP addresses to a single interface. With ip, you don't need the eth0:1 etc. of ifconfig anymore.

I suspect this is an XY-question, if you would tell us what you actually want to achieve, and what you need the second IP address for, it will be easier to answer.