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These Ansible playbooks will deploy a Hortonworks cluster (either Hortonworks Data Platform or Hortonworks DataFlow) using Ambari Blueprints and a static inventory.
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What is a static inventory is described in the Ansible Documentation.
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Using the static inventory implies that the nodes are already built and accessible via SSH.
Before deploying anything, the build node / workstation from where Ansible will run should be prepared.
This node must be able to connect to the cluster nodes via SSH.
It can even be one of the cluster nodes.
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Install the required packages
brew install python pip2 install virtualenv pip2 install virtualenvwrapper -
Create and source the Python virtual environment
virtualenv ~/ansible; source ~/ansible/bin/activate -
Install the required Python packages inside the virtualenv
pip install setuptools --upgrade pip install pip --upgrade pip install ansible -
(Optional) Generate the SSH private key
The build node / workstation will need to login via SSH to the cluster nodes.
This can be done either by using a username and a password or with SSH keys.
For the SSH keys method, the SSH private key needs to be placed or generated on the workstation, normally under .ssh, for example:
~/.ssh/id_rsa.To generate a new key, run the following:
ssh-keygen -q -t rsa -f ~/.ssh/id_rsa
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Install the required packages
sudo yum -y install epel-release || sudo yum -y install http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm sudo yum -y install gcc gcc-c++ python-virtualenv python-pip python-devel libffi-devel openssl-devel libyaml-devel sshpass git vim-enhanced -
Create and source the Python virtual environment
virtualenv ~/ansible; source ~/ansible/bin/activate -
Install the required Python packages inside the virtualenv
pip install setuptools --upgrade pip install pip --upgrade pip install ansible -
(Optional) Generate the SSH private key
The build node / workstation will need to login via SSH to the cluster nodes.
This can be done either by using a username and a password or with SSH keys.
For the SSH keys method, the SSH private key needs to be placed or generated on the workstation, normally under .ssh, for example:
~/.ssh/id_rsa.To generate a new key, run the following:
ssh-keygen -q -t rsa -f ~/.ssh/id_rsa
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Install required packages:
sudo apt-get update sudo apt-get -y install unzip python-virtualenv python-pip python-dev sshpass git libffi-dev libssl-dev libyaml-dev vim -
Create and source the Python virtual environment
virtualenv ~/ansible; source ~/ansible/bin/activate -
Install the required Python packages inside the virtualenv
pip install setuptools --upgrade pip install pip --upgrade pip install ansible -
(Optional) Generate the SSH private key
The build node / workstation will need to login via SSH to the cluster nodes.
This can be done either by using a username and a password or with SSH keys.
For the SSH keys method, the SSH private key needs to be placed or generated on the build node / workstation, normally under .ssh, for example:
~/.ssh/id_rsa.To generate a new key, run the following:
ssh-keygen -q -t rsa -f ~/.ssh/id_rsa -C google-user
Upload the ansible-hortonworks repository to the build node / workstation, preferable under the home folder.
If the build node / workstation can directly download the repository, run the following:
cd && git clone https://github.com/hortonworks/ansible-hortonworks.git
If your GitHub SSH key is installed, you can use the SSH link:
cd && git clone [email protected]:hortonworks/ansible-hortonworks.git
Modify the file at ~/ansible-hortonworks/inventory/static to set the static inventory.
The static inventory puts the nodes in different groups as described in the Ansible Documentation.
Each group defines a specific node role, for example master, slave, edge.
The following variables can be set for each node:
| Variable | Description |
|---|---|
| ansible_host | The DNS name or IP of the host to connect to. |
| ansible_user | The Linux user with sudo permissions that Ansible will use to connect to the host (doesn't have to be root. |
| ansible_ssh_pass | (Optional) The SSH password to use when connecting to the host (this is the password of the ansible_user). Either this or ansible_ssh_private_key_file should be configured. |
| ansible_ssh_private_key_file | (Optional) Local path to the SSH private key that will be used to login into the host. Either this or ansible_ssh_pass should be configured. |
| ambari_server | Set it to true for the host that should also run the Ambari Server. |
List the inventory:
ansible -i inventory/static all --list-hosts
Confirm access to hosts in the inventory:
ansible -i inventory/static all -m setup
Modify the file at ~/ansible-hortonworks/playbooks/group_vars/all to set the cluster configuration.
| Variable | Description |
|---|---|
| cluster_name | The name of the cluster. |
| ambari_version | The Ambari version, in the full, 4-number form, for example: 2.6.2.2. |
| hdp_version | The HDP version, in the full, 4-number form, for example: 2.6.5.0. |
| hdf_version | The HDF version, in the full, 4-number form, for example: 3.1.2.0. |
| repo_base_url | The base URL for the repositories. Change this to the local web server url if using a Local Repository. /HDP/<OS>/2.x/updates/<latest.version> (or /HDF/..) will be appended to this value to set it accordingly if there are additional URL paths. |
| java | Can be set to embedded (default - downloaded by Ambari), openjdk or oraclejdk. If oraclejdk is selected, then the .x64.tar.gz package must be downloaded in advance from Oracle. Same with the JCE package. These files can be copied to all nodes in advanced or only to the Ansible Controller and Ansible will copy them. This behaviour is controlled by the oraclejdk_options.remote_files setting. |
| oraclejdk_options | These options are only relevant if java is set to oraclejdk. |
| .base_folder | This indicates the folder where the Java package should be unpacked to. The default of /usr/java is also used by the Oracle JDK rpm. |
| .tarball_location | The location of the tarball file. This can be the location on the remote systems or on the Ansible controller, depending on the remote_files variable. |
| .jce_location | The location of the JCE package zip file. This can be the location on the remote systems or on the Ansible controller, depending on the remote_files variable. |
| .remote_files | If this variable is set to yes then the tarball and JCE files must already be present on the remote system. If set to no then the files will be copied by Ansible (from the Ansible controller to the remote systems). |
| external_dns | This controls the type of DNS to be used. If yes it will use whatever DNS is currently set up. If no it will populate the /etc/hosts file with all cluster nodes. |
| disable_firewall | This variable controls the local firewall service (iptables, firewalld, ufw). Sometimes, a local firewall service might run and block inter-node cluster communication. In these circumstances the local firewall service should be disabled as traffic rules should be provided by an external firewall such as a Cisco ASA. Set to yes to disable the existing local firewall service if it blocks the inter-node cluster communication. |
| accept_gpl | Set to yes to enable Ambari Server to download and install GPL Licensed packages as explained on the documentation. |
| Variable | Description |
|---|---|
| security | This variable controls the Kerberos security configuration. If set to none, Kerberos will not be enabled. Otherwise the choice is between mit-kdc or active-directory. |
| security_options | These options are only relevant if security is not none. All of the options here are used for an Ambari managed security configuration. No manual option is available at the moment. |
| .external_hostname | The hostname/IP of the Kerberos server. This can be an existing Active Directory or MIT KDC. If left empty '' then the playbooks will install the MIT KDC on the Ambari node and prepare everything. |
| .realm | The realm that will be used when creating service principals. |
| .admin_principal | The Kerberos principal that has the permissions to create new users. No need to append the realm to this value. In case of Active Directory, this user must have Create, delete, and manage user accounts permissions over the OU container. If installing a new MIT KDC this user will be created by the playbook. |
| .admin_password | The password for the above user. |
| .kdc_master_key | The master password for the Kerberos database. Only used when installing a new MIT KDC (when security is mit-kdc and external_hostname is set to ''. |
| .ldap_url | The URL to the Active Directory LDAPS interface. Only used when security is set to active-directory. |
| .container_dn | The distinguished name (DN) of the container that will store the service principals. Only used when security is set to active-directory. |
| .http_authentication | Set to yes to enable Kerberos HTTP authentication (SPNEGO) for most UIs. |
Modify the file at ~/ansible-hortonworks/playbooks/group_vars/ambari-server to set the Ambari Server specific configuration.
| Variable | Description |
|---|---|
| ambari_admin_user | The Ambari administrator's username, normally admin. This user and the password bellow are used to login to Ambari for API requests. |
| ambari_admin_password | The Ambari password of the ambari_admin_user user previously set. If the username is admin and this password is different than the default admin, the ambari-config role will change the default password with the one set here. |
| ambari_admin_default_password | The default password for the Ambari admin user. This is normally admin after Ambari is first installed. No need to change this unless there's a change in the Ambari codebase. |
| wait / wait_timeout | Set this to true if you want the playbook to wait for the cluster to be successfully built after applying the blueprint. The timeout setting controls for how long (in seconds) should it wait for the cluster build. |
| default_password | A default password for all required passwords which are not specified in the blueprint. |
| config_recommendation_strategy | Configuration field which specifies the strategy of applying configuration recommendations to a cluster as explained in the documentation. |
| cluster_template_file | The path to the cluster creation template file that will be used to build the cluster. It can be an absolute path or relative to the ambari-blueprint/templates folder. The default should be sufficient as it uses Jinja2 Template to generate the file. |
| Variable | Description |
|---|---|
| database | The type of database that should be used. A choice between embedded (Ambari default), postgres, mysql or mariadb. |
| database_options | These options are only relevant for the non-embedded database. |
| .external_hostname | The hostname/IP of the database server. This needs to be prepared as per the documentation. No need to load any schema, this will be done by Ansible, but the users and databases must be created in advance. If left empty '' then the playbooks will install the database server on the Ambari node and prepare everything with the settings defined bellow. To change any settings (like the version or repository path) modify the OS specific files under the playbooks/roles/database/vars/ folder. |
| .ambari_db_name,_username,_password | The name of the database that Ambari should use and the username and password to connect to it. If database_options.external_hostname is defined, these values will be used to connect to the database, otherwise the Ansible playbook will create the database and the user. |
| .hive_db_name,_username,_password | The name of the database that Hive should use and the username and password to connect to it. If database_options.external_hostname is defined, these values will be used to connect to the database, otherwise the Ansible playbook will create the database and the user. |
| .oozie_db_name,_username,_password | The name of the database that Oozie should use and the username and password to connect to it. If database_options.external_hostname is defined, these values will be used to connect to the database, otherwise the Ansible playbook will create the database and the user. |
| .rangeradmin_db_name,_username,_password | The name of the database that Ranger Admin should use and the username and password to connect to it. If database_options.external_hostname is defined, these values will be used to connect to the database, otherwise the Ansible playbook will create the database and the user. |
| .registry_db_name,_username,_password | The name of the database that Schema Registry should use and the username and password to connect to it. If database_options.external_hostname is defined, these values will be used to connect to the database, otherwise the Ansible playbook will create the database and the user. |
| .streamline_db_name,_username,_password | The name of the database that SAM should use and the username and password to connect to it. If database_options.external_hostname is defined, these values will be used to connect to the database, otherwise the Ansible playbook will create the database and the user. |
| Variable | Description |
|---|---|
| ranger_options | These options are only relevant if RANGER_ADMIN is a component of the dynamic Blueprint stack. |
| .ranger_admin_password | The password for the Ranger admin users (both admin and amb_ranger_admin). |
| .enable_plugins | If set to yes the plugins for all of the available services will be enabled. With no Ranger would be installed but not functional. |
| Variable | Description |
|---|---|
| blueprint_name | The name of the blueprint as it will be stored in Ambari. |
| blueprint_file | The path to the blueprint file that will be uploaded to Ambari. It can be an absolute path or relative to the roles/ambari-blueprint/templates folder. The blueprint file can also contain Jinja2 Template variables. |
| blueprint_dynamic | Settings for the dynamic blueprint template - only used if blueprint_file is set to blueprint_dynamic.j2. The role names must match the groups from the inventory setting file ~/ansible-hortonworks/inventory/static/group_vars/all. The chosen components are split into two lists: clients and services. The chosen Component layout must respect Ambari Blueprint restrictions - for example if a single NAMENODE is configured, there must also be a SECONDARY_NAMENODE component. |
Run the script that will install the cluster using Blueprints while taking care of the necessary prerequisites.
Make sure you set the CLOUD_TO_USE environment variable to static.
export CLOUD_TO_USE=static
cd ~/ansible-hortonworks*/ && bash install_cluster.sh
You may need to load the environment variables if this is a new session:
source ~/ansible/bin/activate
This script will apply all the required playbooks in one run, but you can also apply the individual playbooks by running the following wrapper scripts:
- Prepare the nodes:
prepare_nodes.sh - Install Ambari:
install_ambari.sh - Configure Ambari:
configure_ambari.sh - Apply Blueprint:
apply_blueprint.sh - Post Install:
post_install.sh