Bamboo

Bamboo is a web daemon that automatically configures HAProxy for web services deployed on Apache Mesos and Marathon.

It features:

• User interface for configuring HAProxy ACL rules for each Marathon application
• Rest API for configuring proxy ACL rules
• Auto configure HAProxy configuration file based your template; you can provision your own template in production to enable SSL and HAProxy stats interface, or configuring different load balance strategy
• Optionally handles health check endpoint if Marathon app is configured with Healthchecks
• Daemon itself is stateless; enables horizontal replication and scalability
• Developed in Golang, deployment on HAProxy instance has no additional dependency
• Optionally integrates with StatsD to monitor configuration reload event

Compatibility

v0.1.1 supports Marathon 0.6 and Mesos 0.19.x

v0.2.2 supports both DNS and non-DNS proxy ACL rules

v0.2.8 supports both HTTP & TCP via custom Marathon enviroment variables (read below for details)

v0.2.9 supports Marathon 0.7.* (with http_callback enabled) and Mesos 0.21.x

v0.2.11 improves API, deprecate previous API endpoint

Releases and changelog

Since Marathon API and behaviour may change over time, especially in this early days. You should expect we aim to catch up those changes, improve design and adding new features. We aim to maintain backwards compatibility when possible. Releases and changelog are maintained in the releases page. Please read them when upgrading.

Deployment Guide

You can deploy Bamboo with HAProxy on each Mesos slave. Each web service being allocated on Mesos Slave can discover services via localhost or domain you assigned by ACL rules. Alternatively, you can deploy Bamboo and HAProxy on separate instances, which means you need to loadbalance HAProxy cluster.

User Interface

UI is useful to manage and visualize current state of proxy rules. Of course, you can configure HAProxy template to load balance Bamboo.

StatsD Monitoring

Configuration and Template

Bamboo binary accepts -config option to specify application configuration JSON file location. Type -help to get current available options.

Example configuration and HAProxy template can be found under config/production.example.json and config/haproxy_template.cfg This section tries to explain usage in code comment style:

{
  // Marathon instance configuration
  "Marathon": {
    // Marathon service HTTP endpoints
    "Endpoint": "http://marathon1:8080,http://marathon2:8080,http://marathon3:8080",
    // Use the Marathon HTTP event streaming feature (Bamboo 0.2.16, Marathon v0.9.0)
    "UseEventStream": true
  },

  "Bamboo": {
    // Bamboo's HTTP address can be accessed by Marathon
    // This is used for Marathon HTTP callback, and each instance of Bamboo
    // must be provided a unique Endpoint directly addressable by Marathon
    // (e.g., the IP address of each server)
    "Endpoint": "http://localhost:8000",

    // Proxy setting information is stored in Zookeeper
    // Bamboo will create this path if it does not already exist
    "Zookeeper": {
      // Use the same ZK setting if you run on the same ZK cluster
      "Host": "zk01.example.com:2812,zk02.example.com:2812",
      "Path": "/marathon-haproxy/state",
      "ReportingDelay": 5
    }
  }


  // Make sure using absolute path on production
  "HAProxy": {
    "TemplatePath": "/var/bamboo/haproxy_template.cfg",
    "OutputPath": "/etc/haproxy/haproxy.cfg",
    "ReloadCommand": "haproxy -f /etc/haproxy/haproxy.cfg -p /var/run/haproxy.pid -D -sf $(cat /var/run/haproxy.pid)",
    // A command that will validate the config before running reload command.
    // '{{.}}' will be expanded to a temporary path that contains the config contents
    "ReloadValidationCommand": "haproxy -c -f {{.}}",
    // A command that will always be run after ReloadCommand, even if the reload fails
    "ReloadCleanupCommand": "exit 0"
  },

  // Enable or disable StatsD event tracking
  "StatsD": {
    "Enabled": false,
    // StatsD or Graphite server host
    "Host": "localhost:8125",
    // StatsD namespace prefix
    // If you have multiple Bamboo instances, you might want to label each node
    // by bamboo-server.production.n1.
    "Prefix": "bamboo-server.production."
  }
}

Customize HAProxy Template with Marathon App Environment Variables

Marathon app env variables are available to be called in the template. The default template shipped with Bamboo is aware of BAMBOO_TCP_PORT. When this variable is specified in Marathon app creation, the application will be configured with TCP mode. For example:

{
  "id": "FileServer",
  "cmd": "python -m SimpleHTTPServer $PORT0",
  "cpus": 0.1,
  "mem": 90,
  "ports": [0],
  "instances": 2,
  "env": {
    "BAMBOO_TCP_PORT": "1080",
    "MY_CUSTOM_ENV": "hello"
  }
}

In this example, both BAMBOO_TCP_PORT and MY_CUSTOM_ENV can be accessed in HAProxy template. This enables flexible template customization depending on your preferences.

Default Haproxy Template ACL

The default acl rule in the haproxy_template.cfg uses the full marathon app id, which may include slash-separated groups.

        # This is the default proxy criteria
        acl {{ $app.EscapedId }}-aclrule path_beg -i {{ $app.Id }}

For example if your app is named "/mygroup/appname", your default acl will be path_beg -i /mygroup/appname. This can always be changed using the bamboo web UI.

There is also a DNS friendly version of your marathon app Id which can be used instead of the slash-separated one. MesosDnsId includes the groups as hyphenated suffixes. For example, if your appname is "/another/group/app" then the MesosDnsId will be "app-group-another".

You can edit the haproxy_template.cfg and use the DNS friendly name for your default ACL instead.

    acl {{ $app.EscapedId }}-aclrule hdr_dom(host) -i {{ $app.MesosDnsId }}

Environment Variables

Configuration in the production.json file can be overridden with environment variables below. This is generally useful when you are building a Docker image for Bamboo and HAProxy. If they are not specified then the values from the configuration file will be used.

Environment Variable	Corresponds To
MARATHON_ENDPOINT	Marathon.Endpoint
MARATHON_USER	Marathon.User
MARATHON_PASSWORD	Marathon.Password
BAMBOO_ENDPOINT	Bamboo.Endpoint
BAMBOO_ZK_HOST	Bamboo.Zookeeper.Host
BAMBOO_ZK_PATH	Bamboo.Zookeeper.Path
HAPROXY_TEMPLATE_PATH	HAProxy.TemplatePath
HAPROXY_OUTPUT_PATH	HAProxy.OutputPath
HAPROXY_RELOAD_CMD	HAProxy.ReloadCommand
BAMBOO_DOCKER_AUTO_HOST	Sets BAMBOO_ENDPOINT=$HOST when Bamboo container starts. Can be any value.
STATSD_ENABLED	StatsD.Enabled
STATSD_PREFIX	StatsD.Prefix
STATSD_HOST	StatsD.Host

REST APIs

GET /api/state

Shows the data structure used for rendering template

curl -i http://localhost:8000/api/state

GET /api/services

Shows all service configurations

curl -i http://localhost:8000/api/services

Example result:

{
    "/authentication-service": {
        "Id": "/authentication-service",
        "Acl": "path_beg -i /authentication-service"
    },
    "/payment-service": {
        "Id": "/payment-service",
        "Acl": "path_beg -i /payment-service"
    }
}

POST /api/services

Creates a service configuration for a Marathon Application ID

curl -i -X POST -d '{"id":"/ExampleAppGroup/app1","acl":"hdr(host) -i app-1.example.com"}' http://localhost:8000/api/services

PUT /api/services/:id

Updates an existing or creates a new service configuration for a Marathon application. :id is the Marathon Application ID

curl -i -X PUT -d '{"id":"/ExampleAppGroup/app1", "acl":"path_beg -i /group/app-1"}' http://localhost:8000/api/services//ExampleAppGroup/app1

Note: Create semantics are available since version 0.2.11.

DELETE /api/services/:id

Deletes an existing service configuration. :id Marathon Application ID

curl -i -X DELETE http://localhost:8000/api/services//ExampleAppGroup/app1

GET /status

Bamboo webapp's healthcheck point

curl -i http://localhost:8000/status

Deployment

We recommend installing binary with deb or rpm package.

The repository includes an example deb package build script called builder/build.sh which generates a deb package in ./output. For this install fpm and run:

go build bamboo.go
./builder/build.sh

Moreover, there is

• a Jenkins build script to run build.sh from a Jenkins job
• and a Docker build container which will generate the deb package in the volume mounted output directory:

docker build -f Dockerfile-deb -t bamboo-build .
docker run -it -v $(pwd)/output:/output bamboo-build

Independently how you build the deb package, you can copy it to a server or publish to your own apt repository.

The example deb package deploys:

• Upstart job bamboo-server, e.g. upstart assumes /var/bamboo/production.json is configured correctly.
• Application directory is under /opt/bamboo/
• Configuration and logs is under /var/bamboo/
• Log file is rotated automatically

In case you're not using upstart, a template init.d service is provided in init.d-bamboo-server. Install it with

sudo cp builder/init.d-bamboo-server /etc/init.d/bamboo-server
sudo chown root:root /etc/init.d/bamboo-server
sudo chmod 755 /etc/init.d/bamboo-server
sudo update-rc.d "bamboo-server" defaults

You can then start the server with sudo service bamboo-server start. Other commands: status, restart, stop

As a Docker container

There is a Dockerfile that will allow Bamboo to be built and run from within a Docker container.

Building the image

The Docker image can be built and added to your local repository with the following command from within the project root directory:

docker build -t bamboo .

Running Bamboo as a Docker container

Once the image has been built, running as a container is straightforward - you do however still need to provide the configuration to the image as environment variables. Docker allows two options for this - using the -e option or by putting them in a file and using the --env-file option. Bamboo use Marathon event bus to get app info, so make sure set --event_subscriber http_callback or env MARATHON_EVENT_SUBSCRIBER=http_callback before start marathon instance.For this example we will use the former and we will map through ports 8000 and 80 to the docker host (obviously the hosts configured here will need to be reachable from this container):

docker run -t -i --rm -p 8000:8000 -p 80:80 \
    -e MARATHON_ENDPOINT=http://marathon1:8080,http://marathon2:8080,http://marathon3:8080 \
    -e BAMBOO_ENDPOINT=http://bamboo:8000 \
    -e BAMBOO_ZK_HOST=zk01.example.com:2181,zk02.example.com:2181 \
    -e BAMBOO_ZK_PATH=/bamboo \
    -e BIND=":8000" \
    -e CONFIG_PATH="config/production.example.json" \
    -e BAMBOO_DOCKER_AUTO_HOST=true \
    bamboo

Bamboo is started by supervisord in this Docker image. The default Supervisord configuration redirects stderr/stdout logs to the terminal. If you wish to turn the debug information off in production, you can use an alternative configuration.

Development and Contribution

We use godep managing Go package dependencies; Goconvey for unit testing; CommonJS and SASS for frontend development and build distribution.

• Golang 1.3
• Node.js 0.10.x+

Golang:

# Pakcage manager
go get github.com/tools/godep
# Testing Toolkit
go get -t github.com/smartystreets/goconvey

cd $GOPATH/src/github.com/QubitProducts/bamboo

# Build your binary
go build

# Run test (requires a local zookeeper running)
goconvey

Node.js UI dependencies:

# Global 
npm install -g grunt-cli napa browserify node-static foreman karma-cli
# Local
npm install && napa

# Start a foreman configured with Procfile for building SASS and JavaScript 
nf start

License

Bamboo is released under Apache License 2.0