PanteraS
entire Platform as a Service, in a box

"One container to rule them all"

Now you can create a completely dockerized environment for a platform as a service (PaaS) in no time!
PanteraS contains all the necessary components for a highly robust, highly available, fault tolerant PaaS.
The goal is to spawn fully scalable, easy to monitor, debug and orchestrate services in seconds. Totally independent of the underlying infrastructure. PanteraS is also fully transferable between development stages. You can run it on your laptop, test and production systems without hassle.

"You shall not PaaS"

Architecture

Components

• Mesos + Marathon + ZooKeeper (orchestration components)
• Consul (K/V store, monitoring, service directory and registry) + Registrator (automating register/ deregister)
• Fabio (load balancer with dynamic config generation)

Master+Slave mode Container

This is the default configuration. It will start all components inside a container.
It is recommended to run 3 master containers to ensure high availability of the PasteraS cluster.

Only Slave mode Container

Slave mode is enabled by MASTER=false
In this mode only slave components will start (master part is excluded). You can run as many slaves as you wish - this is fully scalable.

Multiple Datacenter supported by Consul

To connect multiple datacenters use consul join -wan <server 1> <server 2>

Combination of daemons startup

Depending on MASTER and SLAVE you can define role of the container

daemon\role	default	Only Master	Only Slave
.	MASTER=true	MASTER=true	MASTER=false
.	SLAVE=true	SLAVE=false	SLAVE=true
Consul	x	x	x
Mesos Master	x	x	-
Marathon	x	x	-
Zookeeper	x	x	-
Mesos Slave	x	-	x
Registrator	x	-	x
Fabio	x	-	x
Traefik	-	-	x
Netdata	-	-	-

Optional services (disabled by default) require manual override like START_TRAEFIK=true

Requirements:

• docker >= 1.12
• docker-compose >= 1.8.0

Usage:

Clone it

git clone -b 0.4.3 https://github.com/eBayClassifiedsGroup/PanteraS.git
cd PanteraS

Default: Stand alone mode

(master and slave in one box)

# vagrant up

or

# IP=<DOCKER_HOST_IP> ./generate_yml.sh
# docker-compose up -d

3 Masters + N slaves:

Configure zookeeper and consul:

everyhost# mkdir restricted
everyhost# echo 'ZOOKEEPER_HOSTS="masterhost-1:2181,masterhost-2:2181,masterhost-3:2181"' >> restricted/host
everyhost# echo 'CONSUL_HOSTS="-join=masterhost-1 -join=masterhost-2 -join=masterhost-3"' >> restricted/host
everyhost# echo 'MESOS_MASTER_QUORUM=2' >> restricted/host

Lets set only masterhost-1 to bootstrap the consul

masterhost-1# echo 'CONSUL_PARAMS="-bootstrap-expect 3"' >> restricted/host
masterhost-1# echo 'ZOOKEEPER_ID=1' >> restricted/host
masterhost-2# echo 'ZOOKEEPER_ID=2' >> restricted/host
masterhost-3# echo 'ZOOKEEPER_ID=3' >> restricted/host

Optionally, if you have multiple IPs, set an IP address of docker host (do not use docker0 interface IP)
if you don't set it - it will try to guess dig +short ${HOSTNAME}

masterhost-1# echo 'IP=x.x.x.1' >> restricted/host
masterhost-2# echo 'IP=x.x.x.2' >> restricted/host
masterhost-3# echo 'IP=x.x.x.3' >> restricted/host

Start containers:

masterhost-n# ./generate_yml.sh
masterhost-n# docker-compose up -d

slavehost-n# MASTER=false ./generate_yml.sh
slavehost-n# docker-compose up -d

Web Interfaces

You can reach the PaaS components on the following ports:

• Fabio: http://hostname:81
• Consul: http://hostname:8500
• Marathon: http://hostname:8080
• Mesos: http://hostname:5050
• Supervisord: http://hostname:9000
• Netdata: http://hostname:19999 (must run START_NETDATA=true)

Listening address

All PaaS components listen default on all interfaces (to all addresses: 0.0.0.0),
which might be dangerous if you want to expose the PaaS.
Use ENV LISTEN_IP if you want to listen on specific IP address.
for example:
echo LISTEN_IP=192.168.10.10 >> restricted/host
This might not work for all services like Marathon that has some additional random ports.

Services Accessibility

You might want to access the PaaS and services with your browser directly via service name like:

http://your_service.service.consul

This could be problematic. It depends where you run docker host. We have prepared two services that might help you solving this problem.

DNS - which supposed to be running on every docker host, it is important that you have only one DNS server occupying port 53 on docker host, you might need to disable yours, if you have already configured.

If you have direct access to the docker host DNS, then just modify your /etc/resolv.conf adding its IP address.

If you do NOT have direct access to docker host DNS, you can use SSHuttle project
so you can tunnel DNS traffic over ssh

Running an example application

There are two examples available:
SimpleWebappPython - basic example - spawn 2x2 containers
SmoothWebappPython - similar to previous one, but with smooth scaling down

Fabio will balance the ports which where mapped and assigned by marathon.

For non human access like services intercommunication, you can use direct access using DNS consul SRV abilities, to verify answers:

$ dig python.service.consul +tcp SRV

or ask consul DNS directly:

$ dig @$CONSUL_IP -p8600  python.service.consul +tcp SRV

Deploy using marathon_deploy

You can deploy your services using marathon_deploy, which also understand YAML and JSON files. As a benefit, you can have static part in YAML deployment plans, and dynamic part (like version or URL) set with ENV variables, specified with %%MACROS%% in deployment plan.

apt-get install ruby1.9.1-dev
gem install marathon_deploy

more info: https://github.com/eBayClassifiedsGroup/marathon_deploy

References

[1] https://www.docker.com/
[2] http://docs.docker.com/compose/
[3] http://stackoverflow.com/questions/25217208/setting-up-a-docker-fig-mesos-environment
[4] http://www.consul.io/docs/