Ansible playbook to deploy distributed technologies

This project is a set of Ansible playbooks to easily install a set of distributed technologies on AWS

Table of Contents

1. Supported playbooks
2. Supported commands
3. Setup

• On your local/remote machine
• Using Docker container

4. Playbooks

• Launch/Terminate EC2 instances on AWS
• Zookeeper
• Kafka
• Vowpal Wabbit

Supported playbooks

• EC2
• Zookeeper
• Kafka

Supported Commands

~$ ansible-playbook <master-playbook>.yml --extra-vars "<var1>=<value1> <var2>=<value2>" --tags "<tag1>,<tag2>"

• EC2 playbook is controlled by a yaml file containing variables for the EC2 instances to be acted on. More details below
• Zookeeper, Kafka, and Vowpal Wabbit playbooks need respective cluster tags to be specified to identify which nodes are in the cluster and need to be acted on. More details below

Setup

On your local/remote machine

1. Setup ansible for your system
2. Create following folders

~$ mkdir -p /etc/ansible/hosts

3. Clone this repo

~$ git clone https://github.com/InsightDataScience/ansible-playbook.git

4. Copy the ec2.py and ec2.ini files in this repo to /etc/ansible/hosts
5. Update information in ansible_example.cfg and move it to /etc/ansible/ansible.cfg
6. Export AWS credentials as environment variables

export AWS_ACCESS_KEY_ID=XXXXXXXXXXXXXX
export AWS_SECRET_ACCESS_KEY=XXXXXXXXXXXXXX

Using Docker container

1. Setup Docker for your system
2. Clone this repo

~$ git clone https://github.com/InsightDataScience/ansible-playbook.git

3. Build your docker image locally with the following command - run this from the root folder of this repo

~$ docker build -t ansible-playbook -f conf/Dockerfile .

4. Run the docker container in interactive mode using the script in the repo - run_ansible_playbook_container.sh

~$ ./run_ansible_playbook_container.sh

5. Update information in /etc/ansible/ansible.cfg config file inside the container
6. Export AWS credentials in ~/.profile inside the container

export AWS_ACCESS_KEY_ID=XXXXXXXXXXXXXX
export AWS_SECRET_ACCESS_KEY=XXXXXXXXXXXXXX

Playbooks

• ###EC2

  Launch/Start/Stop/Terminate EC2 instances on AWS.

  • ####Variable file:

    Update example_ec2_vars.yml as per your requirement

    EC2 playbook is controlled by a yaml file with variables defined for the EC2 instances. An example variable file -example_ec2_vars.yml - is included in this repo. You can define your own yaml file with the following information:

    ---
    key_pair: <key-name>
    instance_type: <instance-type>
    region: <region>
    security_group_id: <security-group-id>
    num_instances: <num-of-instances>
    subnet_id: <subent-id>
    tag_key_vals:
      Name: <cluster-name>
      <custom-tag-key1>: <custom-tag-val1>
      <custom-tag-key2>: <custom-tag-val2>

    The Name tag in the tag_key_vals is mandatory to create an identifier for the instances. More tags can be added if needed but are optional.

    In your terminal, you will likely also need to add your private key to an ssh agent:

    ssh-add </path/to/my.pem>

  • ####Launch EC2 instances:

    ~$ ansible-playbook ./ec2.yml --extra-vars "vars_file=./example_ec2_vars.yml" --tags launch

  • ####Stop EC2 instances:

    ~$ ansible-playbook ./ec2.yml --extra-vars "vars_file=./example_ec2_vars.yml" --tags stop 

  • ####Start EC2 instances:

    ~$ ansible-playbook ./ec2.yml --extra-vars "vars_file=./example_ec2_vars.yml" --tags start 

  • ####Terminate EC2 instances:

    ~$ ansible-playbook ./ec2.yml --extra-vars "vars_file=./example_ec2_vars.yml" --tags terminate

• ###Zookeeper For Zookeeper playbook, a zookeeper_tag needs to be specified to identify the nodes in the cluster. This zookeeper_tag can be any tag specified in tag_key_vals in the variable file for [EC2]( while launching EC2 instances.

  The zookeeper_tag is specifed as <key>_<value> for one of the tag_key_vals to be used. For example, if the <cluster-name> in the EC2 variable file mentioned above was test-cluster, the zookeeper_tag would be specified as zookeeper_tag=Name_test-cluster. It doesn't have to be the Name tag but could be any key value pair in tag_key_vals specified as zookeeper_tag=<key>_<value>.

  • ####Install Zookeeper:

    ~$ ansible-playbook ./zookeeper.yml --extra-vars "zookeeper_tag=<cluster_tag>" --tags install

  • ####Start Zookeeper:

    ~$ ansible-playbook ./zookeeper.yml --extra-vars "zookeeper_tag=<cluster_tag>" --tags start

  • ####Get info about Zookeeper on the specified cluster:

    ~$ ansible-playbook ./zookeeper.yml --extra-vars "zookeeper_tag=<cluster_tag>" --tags info

  • ####Stop Zookeeper:

    ~$ ansible-playbook ./zookeeper.yml --extra-vars "zookeeper_tag=<cluster_tag>" --tags stop 

  • ####Uninstall Zookeeper:

    ~$ ansible-playbook ./zookeeper.yml --extra-vars "zookeeper_tag=<cluster_tag>" --tags uninstall

• ###Kafka Kafka has a dependency on Zookeeper for cluster membership, topic configuration, data partition, etc. For Kafka playbook, a zookeeper_tag and a kafka_tag needs to be specified to identify the nodes in the zookeeper and kafka cluster respectively. The kafka_tag and zookeeper_tag can be any tag specified in tag_key_vals in the variable file for EC2.

  The kafka_tag and zookeeper_tag are specifed as <key>_<value> for one of the tag_key_vals to be used. For example, if the <cluster-name> in the EC2 variable file mentioned above was test-cluster and we had same cluster for Zookeeper and Kafka, the kafka_tag and zookeeper_tag would be specified as zookeeper_tag=Name_test-cluster and kafka_tag=Name_test-cluster respectively. Both Zookeeper and Kafka don't have to be on the same cluster and it doesn't have to be the Name tag but it could be any key value pair in tag_key_vals specified as zookeeper_tag=<key>_<value> and kafka_tag=<key>_<value>.

  ####Kafka's dependency on Zookeeper

  Kafka's dependency on Zookeeper is taken care of by the Kafka playbook. If you are trying to ssetup Kafka on the cluster specified by kafka_tag, the playbook will check that Zookeeper is installed on the cluster zookeeper_tag and if it is not setup, the playbook will first setup Zookeeper and then Kafka. By default, any operation on Kafka cluster, like start, install, etc., will first be executed on the Zookeeper cluster. However, we would want some of the operations to be executed on the Kafka cluster, like stop, uninstall, etc., not be executed on the Zookeeper cluster. This can be achieved by specifying a flag --skip-tags zookeeper while running the Kafka playbook. Examples for this behavior are shown below in the stop and uninstall operations.

  • ####Install Kafka:

    ~$ ansible-playbook ./kafka.yml --extra-vars "zookeeper_tag=<cluster_tag> kafka_tag=<cluster_tag>" --tags install

  • ####Start Kafka:

    ~$ ansible-playbook ./kafka.yml --extra-vars "zookeeper_tag=<cluster_tag> kafka_tag=<cluster_tag>" --tags start

  • ####Get info about Kafka on the specified cluster:

    ~$ ansible-playbook ./kafka.yml --extra-vars "zookeeper_tag=<cluster_tag> kafka_tag=<cluster_tag>" --tags info

  • ####Stop Kafka:

    ~$ ansible-playbook ./kafka.yml --extra-vars "zookeeper_tag=<cluster_tag> kafka_tag=<cluster_tag>" --tags stop --skip-tags zookeeper

  • ####Uninstall Kafka:

    ~$ ansible-playbook ./kafka.yml --extra-vars "zookeeper_tag=<cluster_tag> kafka_tag=<cluster_tag>" --tags uninstall --skip-tags zookeeper
    

• Vowpal Wabbit

Vowpal Wabbit is a fast out-of-core Machine Learning system. Installation can take upwards of 10 minutes on micro instances, as it compiles a lot of C++ with high optimization levels using Clang.

• ####Install Vowpal Wabbit:

  ~$ ansible-playbook ./vw.yml --extra-vars "vw_tag=class_vw" --tags install