osops/contrib/heat/lamp

3-Tier LAMP Sample Heat Template

These heat templates deploy WordPress on a 3-Tier LAMP architecture. There are two versions of the primary template, one which creates a static environment which does not require ceilometer, and one which provides autoscaling of the web and application tiers based on CPU load, which does require ceilometer.

The WordPress 3-Tier LAMP Architecture Sample

Tier	Function	Details
Web	Reverse Proxy Server	Apache + mod_proxy
App	WordPress Server	Apache, PHP, MySQL Client, WordPress
Data	Database Server	MySQL

NOTE: The sample WordPress application was tested with CentOS7 and Ubuntu Trusty. The sample application installation does not currently work with Ubuntu Xenial

Heat File Details

The template uses a nested structure, with two different primary yaml files, both of which utilize the same 4 nested files. The templates were tested using Mitaka release of OpenStack, and Ubuntu server 14.04 and Centos7.

AppWG_3Tier.yaml: If you want a static environment, run this yaml file. This will create a static environment, with two load balanced web servers, and two load balanced application servers, and a single database server using cinder block storage for the database files.

REQUIRED PARAMETERS:

• ssh_key_name, image_id, public_network_id

OPTIONAL PARAMETERS:

• db_instance_flavor, app_instance_flavor, web_instance_flavor, db_server_name, app_server_name, web_server_name, dns_nameserver

AppWG_3Tier_AutoScale.yaml: If you want a dynamic autoscaling environment, run this yaml file. This yaml files sets up heat autoscaling groups.

REQUIRED PARAMETERS:

• ssh_key_name, image_id, public_network_id

OPTIONAL PARAMETERS:

• db_instance_flavor, app_instance_flavor, web_instance_flavor, db_server_name, app_server_name, web_server_name, dns_nameserver

The following 4 yaml files are called by the primary files above, and are by default expected to be in a lib subdirectory:

setup_net_sg.yaml: This file creates 3 separate private networks, one for each tier. In addition it creates two load balancers (using neutron LBaaS V1), one which has a public IP that connects the web private network to the public network, and one with a private IP that connects the web network to the application network. The template also creates a router connecting the application network to the database network. In addition to the networks and routers, the template creates 3 security groups, one for each of the tiers.

heat_web_tier.yaml: This template file launches the web tier nodes. In addition to launching instances, it installs and configures Apache and Apache modproxy which is used to redirect traffic to the application nodes.

heat_app_tier.yaml: This template file launches the application tier nodes. In addition to launching the instances, it installs Apache, PHP, MySQL client, and finally WordPress.

heat_sql_tier.yaml: This template file launches the database tier node and installs MySQL. In addition it creates a cinder block device to store the database files. The template also creates the required users and databases for the WordPress application.

Running the heat template files

First you need to source your credential file. You may download a copy of the credential file from Horizon under Project>Compute>Access & Security>API Access

Example to setup the static environment

openstack stack create --template AppWG_3Tier.yaml --parameter ssh_key_name=mykey --parameter image_id=ubuntu --parameter dns_nameserver="8.8.8.8,8.8.4.4" --parameter public_network_id=external_network ThreeTierLAMP

Example to setup the autoscaling environment

openstack stack create --template AppWG_3Tier_AutoScale.yaml --parameter ssh_key_name=mykey --parameter image_id=centos --parameter dns_nameserver="8.8.8.8,8.8.4.4" --parameter public_network_id=external_network ThreeTierLAMP