PanteraS - Platform as a Service in a box

"One container to rule them all"

Goal

The goal is to spawn a complete dockerized environment,
containing all necessary components for a PaaS,
fully transferable between any kind of development stage: laptop / integration / production,
highly robust, highly available, fail tolerance,
where deployment part is fully independent from a running part.
Services supposed to be spawn in a second, fully scalable, easy to monitor, debug and orchestrate.

Architecture

Components

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

Master+Slave mode Container

This is the default configuration, that starts all components inside container.
It is recommended to run 3 or 5 master containers to ensure high availability of the PasteraS cluster.

Only Slave mode Container

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

Multiple Datacenter supporeted by Consul

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

Combination of deamons 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 | - | Consul-template| x | - | x | Haproxy | x | - | x | Mesos Slave | x | - | x | Registrator| x | - | x | dnsmasq| x | x | x |

Usage:

Clone it

git clone https://github.com/eBayClassifiedsGroup/PanteraS.git
cd PanteraS

Default: Stand alone mode

(master and slave in one box)

# vagrant up

# 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 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:

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, then you have two options:

A. use OpenVPN client an example server we have created for you (in optional), but you need to provide certificates and config file, it might be little bit complex for the beginers, so you might to try second option first.

B. SSHuttle - use https://github.com/apenwarr/sshuttle project so you can tunnel DNS traffic over ssh but you have to have ssh daemon running in some container.

Running an example application

there are two examples:
SimpleWebappPython - basic one - spawn 2x2containers
SmoothWebappPython - simillar to previous, but with smooth scaling down

HAproxy gonna ballance services between ports,
which has been 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 asking consul DNS directly:

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

remmeber to disable DNS caching in your future services.

Put service into HAproxy loadbalancer

In order to put service into loadbalancer (HAproxy), you need to create service with specific consul tag
(ENV SERVICE_TAGS="haproxy") in JSON deployment plan (see examples).

Create A/B test services (AKA canaries services)

You need to create services with the same consul name (ENV SERVICE_NAME="consul_service"), but different marathon id in every JSON deployment plan (see examples)
You need to set different weights for those services. You can propagate weight value using consul tag
(ENV SERVICE_TAGS="haproxy,weight=1")
We set the default weight value for 100 (max is 256).

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/

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