Peng Tao bergwolf

docker volume populate

docker在当一个volume的mountpoint在image里原本有数据的情况下,会把image的数据populate到volume中.这个行为在volume被mount到多个mountpoint的时候,在不同的docker版本行为有差别.

docker 1.10.3,如果volume mount到多个mountpoint,就不会去populate image中原有的数据到volume中

[lear@~]$docker volume create --name foobar
foobar
[lear@~]$docker run --rm -t -v foobar:/vol/data1 -v foobar:/vol/data2 bergwolf/test ls /vol/data1 /vol/data2

spec.proto

syntax = "proto3";

package specs;

message Spec {
        string Version = 1;
        Process Process = 2;
        string Hostname = 4;

Even if we ignore the time consumed by kata-runtime, docker still uses on average 0.629s (0.5526s, 0.684s, 0.588s, 0.69s) to create a new container. So we can claim that docker/containerd architecture makes docker(runc) always slower than hypercontainer now.
All above tests were done with kata persistent storage put in tmpfs. But it does not increate bootup speed. So kata runtime metadata plugin may not help performance either.
The most time consuming operation is kata-runtime create and it needs

How to do a Kata Containers Release

Hi if you are reading this document you may also want to create a kata Containers Release.

The Kata Containers Release Process is defined in the follwoing documents.

https://github.com/kata-containers/documentation/blob/master/Releases.md

To simply the process of read each release we have created a checklist for it.

VM templates provides 38.68% speedup for kata containers when running with containerd shimv2.

	boot speed
no-vm-template avg	0.8199s
with-vm-template avg	0.5028s
speedup	38.68%

CMD to run the test:

Kata 2.0 Release Planning

One release per three weeks

Release	Target Date	Contents	Comments
alpha1	June 5	rust-agent + ttrpc	repository consolidation half done
alpha2	June 26	repository consolidation + ci
alpha3	July 17	close rust-agent feature gaps + image pulling inside sandbox (optional feature) + packaging release pipeline
alpha4	August 7	observability/events/debuggability

	package main

	import (
	"crypto/tls"
	"fmt"

	"github.com/bergwolf/goftp"
	)

	func main() {