Docker instance plugin

[ndegory]

Docker instance plugin for InfraKit

• creates containers based on specs built from Config, HostConfig and []NetworkResource.
• LogicalIDs are Docker hostnames instead of IP (Docker's DNS brings native resolution for the hostname)
• metadata from docker inspect

Can be used with any Docker images but can also be used with Docker in Docker containers in conjunction with the Swarm vanilla plugin.

[YujiOshima]

@ndegory You need to edit vendor.conf and update vendored packages.
See https://github.com/rancher/trash

[YujiOshima]

May be you cannot access docker.sock in CircleCI test.

[ndegory]

thanks for the review @YujiOshima , I'll take care about it.

[GordonTheTurtle]

Please sign your commits following these rules:
https://github.com/docker/docker/blob/master/CONTRIBUTING.md#sign-your-work
The easiest way to do this is to amend the last commit:

$ git clone -b "instance-docker" git@github.com:ndegory/infrakit.git somewhere
$ cd somewhere
$ git rebase -i HEAD~842353663176
editor opens
change each 'pick' to 'edit'
save the file and quit
$ git commit --amend -s --no-edit
$ git rebase --continue # and repeat the amend for each commit
$ git push -f

Amending updates the existing PR. You DO NOT need to open a new one.

[chungers]

CircleCI can't really run tests with docker reliably or at all. Instead of removing this test, do this....

1. import testutil "github.com/docker/infrakit/pkg/testing"
2. Add a check here:

	if testutil.SkipTests("docker") {
		t.SkipNow()
	}

This will skip the test on CircleCI because there's an environment variable set when running tests on CircleCI (see the circle.yml file):

    SKIP_TESTS: "docker,etcd"

[ndegory]

thanks for the tip @chungers

[codecov]

Codecov Report

Merging #469 into master will decrease coverage by 7.63%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #469      +/-   ##
==========================================
- Coverage    63.9%   56.27%   -7.64%     
==========================================
  Files          38       41       +3     
  Lines        2344     2662     +318     
==========================================
  Hits         1498     1498              
- Misses        693     1011     +318     
  Partials      153      153

Impacted Files	Coverage Δ
examples/instance/docker/instance.go	0% <0%> (ø)
examples/instance/docker/builder.go	0% <0%> (ø)
examples/instance/docker/main.go	0% <0%> (ø)

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