- These Ansible playbooks will build a Cloud environment on Azure.
- And then deploy a Hortonworks cluster (either Hortonworks Data Platform or Hortonworks DataFlow) using Ambari Blueprints.
Before building 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 and to the Azure APIs via HTTPS.
-
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 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 pycparser ansible==2.3.2 azure==2.0.0rc5 msrest msrestazure -
Generate the SSH public/private key pair that will be loaded onto the cluster nodes (if none exists):
ssh-keygen -q -t rsa
-
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 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 pycparser ansible==2.3.2 azure==2.0.0rc5 msrest msrestazure -
Generate the SSH public/private key pair that will be loaded onto the cluster nodes (if none exists):
ssh-keygen -q -t rsa
-
Create a service principal
Use the following guide to create a Service Principal.
After the tutorial the following should have been obtained:
- Subscription ID (from the Subscription page in the Azure portal)
- Client ID
- Secret key (generated when the application was created)
- Tenant ID
-
Create the credentials file
Store the obtained credentials in a file and save this file as
.azure/credentialsunder the home folder of the user running the playbook.[default] subscription_id=xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx client_id=xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx secret=xxxxxxxxxxxxxxxxx tenant=xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxxmkdir -p ~/.azure/ cat > ~/.azure/credentials
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/azure/group_vars/all to set the Azure configuration.
This section contains variables that are cluster specific and are used by all nodes:
| Variable | Description |
|---|---|
| name_suffix | A suffix that will be appended to the name of all nodes. Usually it's a domain, but can be anything or even the empty string ''. It's recommended to set this to a domain name when using the Azure internal DNS otherwise the cluster won't use FQDN nodes. |
| location | The Azure Region as described here. |
| admin_username | The Linux user with sudo permissions. Can be customized in Azure as it's used when building the nodes. |
| ssh.privatekey | Local path to the SSH private key that will be used to login into the nodes. This can be the key generated as part of the Build Setup, step 4. |
| ssh.publickey | Local path to the SSH public key that will be placed on cluster nodes at build time. |
| resource_group | A container that holds related resources for an application. It will be created if it doesn't exist. Details here. |
| storage_account | A namespace to store and access Azure Storage data objects. It will be created if it doesn't exist. Must be an unique name across all Azure. Details here. |
| network | The Azure virtual network (VNet). It will be created if it doesn't exist. The address range can be customized. Details here. |
| subnet | Subnet is a range of IP addresses in the VNet previously set. The subnet should be dedicated to only one cluster. It will be created if it doesn't exist. Details here. |
| security_groups | A list of Access Control List (ACL) associated with the subnet. Details here. |
This section contains variables that are node specific.
Nodes are separated by groups, each group defining a specific node role, for example master, slave, edge.
There can be any number of roles so other roles can be added to correspond with the required architecture.
And roles can have any names and any number of nodes but they should correspond with the host groups in the Ambari Blueprint.
| Variable | Description |
|---|---|
| role | The name of the role. This will be appended to the cluster name in order to form a unique group in the Azure Resource Group. This group is used to derive the nodes names (if node count is greater than 1, numbers will be appended to the group name to uniquely identify nodes). |
| count | The number of nodes to be built with this role. |
| image | The OS image to be used. More details here. |
| flavor | The flavor / size of the node. A list of all the flavors can be found here and the pricing here. |
| public_ip | If the VM should have a Public IP assigned to it. Required if the build node does not have access to the private IP range of the cluster nodes. |
| security_group | The security group that should be applied to the node. |
| ambari_server | Set it to true if the role also defines an Ambari Server. The number of nodes with this role should be 1. If there are more than 1 node, ambari-server will be installed on all of them, but only the first one (in alphabetical order) will be used by the Ambari Agents. |
Modify the file at ~/ansible-hortonworks/playbooks/group_vars/all to set the cluster configuration.
| Variable | Description |
|---|---|
| cluster_name | The name of the cluster. This is also used by default in the cloud components that require uniqueness, such as the name of the nodes or tags. |
| ambari_version | The Ambari version, in the full, 4-number form, for example: 2.5.1.0. |
| hdp_version | The HDP version, in the full, 4-number form, for example: 2.6.1.0. |
| hdf_version | The HDF version, in the full, 4-number form, for example: 3.0.1.0. |
| utils_version | The HDP-UTILS version exactly as displayed on the repositories page. This should be set to 1.1.0.21 for HDP 2.5 or HDF, and to 1.1.0.20 for any HDP less than 2.5. |
| 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. |
| mpack_filename | The exact filename of the mpack to be installed as displayed on the repositories page. Example for HDF 3.0.1: hdf-ambari-mpack-3.0.1.0-43.tar.gz. |
| 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 (it must support reverse lookups). If no it will populate the /etc/hosts file with all cluster nodes. This must be set to no (unless a local DNS is used) because the Azure internal DNS doesn't provide reverse lookups. More about the Azure internal DNS can be found in the documentation. |
| 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 Security Groups. Set to yes to disable the existing local firewall service if it blocks the inter-node cluster communication. |
| 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 for cloud builds as it uses the cloud_config variables and 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. 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 | The name of the database Ambari should use. |
| .ambari_db_username | The username that Ambari should use to connect to its database. |
| .ambari_db_password | The password for the above user. |
| .hive_db_name | The name of the database Hive should use. |
| .hive_db_username | The username that Hive should use to connect to its database. |
| .hive_db_password | The password for the above user. |
| .oozie_db_name | The name of the database Oozie should use. |
| .oozie_db_username | The username that Oozie should use to connect to its database. |
| .oozie_db_password | The password for the above user. |
| .rangeradmin_db_name | The name of the database Ranger Admin should use. |
| .rangeradmin_db_username | The username that Ranger Admin should use to connect to its database. |
| .rangeradmin_db_password | The password for the above 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 roles from the inventory setting file ~/ansible-hortonworks/inventory/azure/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 build the Cloud environment.
Set first the CLOUD_TO_USE environment variable to azure.
export CLOUD_TO_USE=azure
cd ~/ansible-hortonworks*/ && bash build_cloud.sh
You may need to load the environment variables if this is a new session:
source ~/ansible/bin/activate
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 azure.
export CLOUD_TO_USE=azure
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