sdc-docker

This repository is part of the Joyent Triton project. See the contribution guidelines -- Triton does not use GitHub PRs -- and general documentation at the main Triton project page.

SDC Docker is the Docker Engine for Triton, where the data center is exposed as a single Docker host. The Docker remote API is served from a "docker" core SDC zone built from this repo.

User Guide

For users of the Triton service in Joyent's public cloud, or those using a private SDC Docker stand-up, but not administering it, please see the User Guide. The rest of this README is targeted at development of sdc-docker.

Docker Version

Offically supported version: 1.21 (equivalent to docker client version 1.9)

Supported version range:

• Remote API: 1.20 to 1.24
• Docker CLI: 1.8 to 1.12
• Docker Compose: 1.6 to 1.8

When a client makes a remote API call to sdc-docker and it does not specify a version, then sdc-docker will default to the officially supported version.

Newer clients may continue to work, but until we've tested and marked a newer version as officially supported, then it's best to use an older and officially supported version.

Devs: When updating the sdc-docker server official version, you'll need to be sure to update the following:

1. update both API_VERSION and SERVER_VERSION version in lib/constants.js
2. update the docker cli test client version in globe-theatre/bin/nightly-test-docker-integration-cli

Current State

Many commands are currently at least partially implemented. See docs/divergence.md for details on where sdc-docker diverges from Docker Inc's docker. This software is under active development to provide parity to the newer Docker features that are relevant to SDC, as well as to integrate with other new Triton features .

Installation

Note: Examples in this section are for CoaL, i.e. some setup will not be appropriate for a production DC.

1. Installing sdc-docker and supporting services:

    ssh root@10.99.99.7                                 # ssh to the CoaL GZ
    sdcadm self-update
    sdcadm post-setup common-external-nics && sleep 10  # imgapi needs external
    sdcadm post-setup dev-headnode-prov
    sdcadm post-setup dev-sample-data  # sample packages for docker containers
    sdcadm post-setup cloudapi
    sdcadm post-setup docker
    sdcadm experimental update dockerlogger
    # Optional additional steps for VXLAN setup.
    # TODO: This isn't well automated yet.
    #    sdcadm post-setup fabrics ...
    #    <reboot>
   

For compute nodes added after the first-time setup, you will need to install the dockerlogger on them by executing:

    sdcadm experimental update dockerlogger --servers ${CN1},${CN2},...

SDC Docker uses (as of DOCKER-312) TLS by default. That means you need to setup a user (or use the 'admin' user) and add an SSH key for access.

2. Create a test user (we'll use "jill"):

    # On your dev machine, create a key
    ssh-keygen -t rsa -f ~/.ssh/sdc-docker-jill.id_rsa -b 2048 -N ""
   
    # Copy it to COAL so we can add it to the 'jill' account.
    scp ~/.ssh/sdc-docker-jill.id_rsa.pub root@10.99.99.7:/var/tmp/
   
    ssh root@10.99.99.7      # ssh to the CoaL GZ
    sdc-useradm create -A login=jill email=jill@localhost userpassword=secret123
    sdc-useradm add-key jill /var/tmp/sdc-docker-jill.id_rsa.pub
   

3. Generate a client TLS certificate and set docker to use --tls mode:

   This script in the sdc-docker repo will create the client certificate and print how to configure docker:

    ./tools/sdc-docker-setup.sh coal jill ~/.ssh/sdc-docker-jill.id_rsa
   

   This also puts the env setup in "~/.sdc/docker/jill/env.sh".

    source ~/.sdc/docker/jill/env.sh
   

You should now able to get docker info and see "SDCAccount: jill":

$ docker info
Containers: 0
Images: 0
Storage Driver: sdc
 SDCAccount: jill
Execution Driver: sdc-0.1.0
Operating System: SmartDataCenter
Name: coal

Docker Compose uses different environment variables across different versions to configure timeout. If you receive any warning about the DOCKER_CLIENT_TIMEOUT environment variable being deprecated, simply unset it and remove it from env.sh.

Using custom TLS server certificates for SDC Docker

SDC Docker can optionally be setup to use your own TLS certificates. By default, the Docker VM is provisioned with a self-signed certificate that can always be overridden with the following commands:

    # Copy your TLS certificate to the SDC headnode (assuming COAL)
    scp ./my-key.pem root@10.99.99.7:/var/tmp/
    scp ./my-cert.pem root@10.99.99.7:/var/tmp/

    # Install the TLS certificate
    sdcadm experimental install-docker-cert -k /var/tmp/my-key.pem -c /var/tmp/my-cert.pem

This command will automatically restart the SDC Docker service so certificate changes will take effect immediately. After changing the TLS certificates, you will need to re-run the ./tools/sdc-docker-setup.sh script.

Running SDC docker in invite-only mode

The public APIs to an SDC -- sdc-docker and cloudapi -- can be configured to be in invite-only mode where only explicitly allowed accounts are given authorized. This mode is configured via the account_allowed_dcs SDC Application config var.

sdc-sapi /applications/$(sdc-sapi /applications?name=sdc | json -H 0.uuid) \
    -X PUT -d '{"metadata": {"account_allowed_dcs": true}}'
# Optional "403 Forbidden" response body.
sdc-sapi /applications/$(sdc-sapi /applications?name=sdc | json -H 0.uuid) \
    -X PUT -d '{"metadata": {"account_allowed_dcs_msg": "talk to your Administrator"}}'

Once enabled, one can allow an account via:

DC=$(sh /lib/sdc/config.sh -json | json datacenter_name)
sdc-useradm add-attr LOGIN allowed_dcs $DC

and an account access removed via:

sdc-useradm delete-attr LOGIN allowed_dcs $DC

Allowed users can be listed via:

sdc-useradm search allowed_dcs=$DC -o uuid,login,email,allowed_dcs

For example:

[root@headnode (coal) ~]# sdc-useradm add-attr admin allowed_dcs coal
Added attribute on user 930896af-bf8c-48d4-885c-6573a94b1853 (admin): allowed_dcs=coal

[root@headnode (coal) ~]# sdc-useradm search allowed_dcs=coal -o uuid,login,email,allowed_dcs
UUID                                  LOGIN  EMAIL           ALLOWED_DCS
930896af-bf8c-48d4-885c-6573a94b1853  admin  root@localhost  ["us-west-2","coal"]

[root@headnode (coal) ~]# sdc-useradm delete-attr admin allowed_dcs coal
Deleted attribute "allowed_dcs=coal" from user 930896af-bf8c-48d4-885c-6573a94b1853 (admin)

Limitation: Currently adding access can take a minute or two to take effect (caching) and removing access requires the sdc-docker server to be restarted (DOCKER-233).

Adding packages

By default the size of the container (ram, disk, cpu shares) uses the package in the internal sdc_ set of packages closest to 'ram=1024 MiB'. The sdc_ packages are really only applicable for development. More appropriate for production is a set of packages separate from sdc_. The following can be run to add a number of sample-* packages and to configure the Docker service to use them:

# In the headnode global zone:
sdcadm post-setup dev-sample-data
/opt/smartdc/bin/sapiadm update \
   $(/opt/smartdc/bin/sdc-sapi /services?name=docker | json -H 0.uuid) \
   metadata.PACKAGE_PREFIX="sample-"

Configurations

The SDC Docker service can be configured with the following Service API (SAPI) metadata values.

Key	Type	Default	Description
USE_TLS	Boolean	false	Turn on TLS authentication.
DEFAULT_MEMORY	Number	1024	The default ram/memory to use for docker containers.
PACKAGE_PREFIX	String	'sample-'	The prefix for packages to use for docker container package selection.
USE_FABRICS	Boolean	false	Provision container internal nic on default fabric network.
ENABLED_LOG_DRIVERS	String	'json-file,none'	Comma-delimited list of log drivers allowed (see Log Drivers)

Here is an example of modifying the service configurations with SAPI,

docker_svc=$(sdc-sapi /services?name=docker | json -Ha uuid)
sdc-sapi /services/$docker_svc -X PUT -d '{ "metadata": { "USE_TLS": true } }'

Development hooks

Before commiting be sure to:

make check      # lint and style checks
make test       # run unit tests

A good way to do that is to install the stock pre-commit hook in your clone via:

make git-hooks

Testing

As shown above, the run unit tests locally:

make test

To run integration tests, you need to call the "test/runtests" driver from the global zone (GZ) of a SmartDataCenter setup with sdc-docker, e.g. with COAL that would be:

ssh root@10.99.99.7
/zones/$(vmadm lookup -1 alias=docker0)/root/opt/smartdc/docker/test/runtests

specifically for COAL there is a target for that:

make test-integration-in-coal

To run (a) a particular subset of integration tests -- using 'info' as a filter on test names in this example -- and (b) with trace-level logging:

LOG_LEVEL=trace /zones/$(vmadm lookup -1 alias=docker0)/root/opt/smartdc/docker/test/runtests -f info 2>&1 | bunyan

Some integration tests (those that don't depend on running in the GZ) can be run from your Mac dev tree, e.g.:

./test/runtest ./test/integration/cli-info.test.js

By default all "cli" integration tests ("test/integration/cli-*.test.js") are run against the latest Docker CLI version (see the DOCKER_AVAILABLE_CLI_VERSIONS variable in "test/runtest.common"). To run against against other versions, or all supported versions, set the DOCKER_CLI_VERSIONS (plural) environment variable, e.g.:

make test-integration-in-coal DOCKER_CLI_VERSIONS=all
make test-integration-in-coal DOCKER_CLI_VERSIONS="1.11.1 1.10.3"
DOCKER_CLI_VERSIONS=1.11.1 /zones/$(vmadm lookup -1 alias=docker0)/root/opt/smartdc/docker/test/runtests -f cli-info
DOCKER_CLI_VERSIONS=latest /zones/$(vmadm lookup -1 alias=docker0)/root/opt/smartdc/docker/test/runtests -f cli-labels

Testing locally

It's also possible to run tests directly from your local development machine, by specifying the sdc environment and launching node on the test file(s):

FWAPI_URL=http://10.99.99.26 VMAPI_URL=http://10.99.99.27 node ./test/integration/run-ports.test.js

Official docker test suite

Docker have their own test suite integration-cli for testing a real docker environment. To run the docker cli tests against coal, you will need a local docker binary and go (golang) installed, then do the following:

# Target coal
export DOCKER_HOST=tcp://my.docker.coal:2376
export DOCKER_TEST_HOST=$DOCKER_HOST

# Set go path, so `go get` works correctly
mkdir go && cd go
export GOPATH=`pwd`

# Checkout docker from git
mkdir -p src/github.com/docker
cd src/github.com/docker
git clone https://github.com/docker/docker.git
cd docker

# Build docker test infrastructure.
sh hack/make/.go-autogen   # docker automated build files
# If `go get` shows an error - just ignore it.
go get ./...               # docker dependencies

cd integration-cli

# Run an individual test
go test -test.run "^TestPsListContainers"

# Run all tests - this will take forever... a specific test will be faster.
go test -v

Development from your Mac

1. Add a 'coal' entry to your '~/.ssh/config'. Not required, but we'll use this as a shortcut in examples below.

    Host coal
        User root
        Hostname 10.99.99.7
        ForwardAgent yes
        StrictHostKeyChecking no
        UserKnownHostsFile /dev/null
        ControlMaster no
   

2. Get a clone on your Mac:

    git clone git@github.com:joyent/sdc-docker.git
    cd sdc-docker
   

3. Make changes in your local clone:

    vi
   

4. Sync your changes to your 'docker0' zone in COAL (see Installation above):

    ./tools/rsync-to coal
   

   This will rsync over changes (excepting binary bits like a change in sdcnode version, or added binary node modules) and restart the docker SMF service.

For testing I tend to have a shell open tailing the docker service's log file:

ssh coal
sdc-login docker
tail -f `svcs -L docker` | bunyan

Coding style

You've gotta have one to put to rest some of the bikeshedding. Here's the one for this repo:

• 4-space indentation

• camelCase capitalization for variables. This is within reason -- exceptions where case is required due to outside APIs (e.g. Docker APIs) is fine.

• ClassCase for classes (i.e. JS prototype'd functions).

• Imports from "lib/models" shall consistently be imported as follows to allow grepping for "Link.list", etc.

    var ImageTag = require('.../models/image-tag');
    var Link = require('.../models/link');
  

Naming

Some variable/function naming patterns in this repo.

Pattern	Description
req*	A restify handler that operates (primarily) on a request and adds a request param. E.g. reqClientApiVersion adds req.clientApiVersion.