| heat_template_version: 2013-05-23 | |
| description: AutoScaling Wordpress | |
| parameters: | |
| image: | |
| type: string | |
| description: Image used for servers | |
| key: | |
| type: string | |
| description: SSH key to connect to the servers | |
| flavor: | |
| type: string | |
| description: flavor used by the web servers | |
| database_flavor: | |
| type: string | |
| description: flavor used by the db server | |
| network: | |
| type: string | |
| description: Network used by the server | |
| subnet_id: | |
| type: string | |
| description: subnet on which the load balancer will be located | |
| database_name: | |
| type: string | |
| description: Name of the wordpress DB | |
| default: wordpress | |
| database_user: | |
| type: string | |
| description: Name of the wordpress user | |
| default: wordpress | |
| external_network_id: | |
| type: string | |
| description: UUID of a Neutron external network | |
| resources: | |
| database_password: | |
| type: OS::Heat::RandomString | |
| database_root_password: | |
| type: OS::Heat::RandomString | |
| db: | |
| type: OS::Nova::Server | |
| properties: | |
| flavor: {get_param: database_flavor} | |
| image: {get_param: image} | |
| key_name: {get_param: key} | |
| networks: [{network: {get_param: network} }] | |
| user_data_format: RAW | |
| user_data: | |
| str_replace: | |
| template: | | |
| #!/bin/bash -v | |
| yum -y install mariadb mariadb-server | |
| systemctl enable mariadb.service | |
| systemctl start mariadb.service | |
| mysqladmin -u root password $db_rootpassword | |
| cat << EOF | mysql -u root --password=$db_rootpassword | |
| CREATE DATABASE $db_name; | |
| GRANT ALL PRIVILEGES ON $db_name.* TO "$db_user"@"%" | |
| IDENTIFIED BY "$db_password"; | |
| FLUSH PRIVILEGES; | |
| EXIT | |
| EOF | |
| params: | |
| $db_rootpassword: {get_attr: [database_root_password, value]} | |
| $db_name: {get_param: database_name} | |
| $db_user: {get_param: database_user} | |
| $db_password: {get_attr: [database_password, value]} | |
| asg: | |
| type: OS::Heat::AutoScalingGroup | |
| properties: | |
| min_size: 1 | |
| max_size: 3 | |
| resource: | |
| type: lb_server.yaml | |
| properties: | |
| flavor: {get_param: flavor} | |
| image: {get_param: image} | |
| key_name: {get_param: key} | |
| network: {get_param: network} | |
| pool_id: {get_resource: pool} | |
| metadata: {"metering.stack": {get_param: "OS::stack_id"}} | |
| user_data: | |
| str_replace: | |
| template: | | |
| #!/bin/bash -v | |
| yum -y install httpd wordpress | |
| systemctl enable httpd.service | |
| systemctl start httpd.service | |
| setsebool -P httpd_can_network_connect_db=1 | |
| sed -i "/Deny from All/d" /etc/httpd/conf.d/wordpress.conf | |
| sed -i "s/Require local/Require all granted/" /etc/httpd/conf.d/wordpress.conf | |
| sed -i s/database_name_here/$db_name/ /etc/wordpress/wp-config.php | |
| sed -i s/username_here/$db_user/ /etc/wordpress/wp-config.php | |
| sed -i s/password_here/$db_password/ /etc/wordpress/wp-config.php | |
| sed -i s/localhost/$db_host/ /etc/wordpress/wp-config.php | |
| systemctl restart httpd.service | |
| params: | |
| $db_name: {get_param: database_name} | |
| $db_user: {get_param: database_user} | |
| $db_password: {get_attr: [database_password, value]} | |
| $db_host: {get_attr: [db, first_address]} | |
| web_server_scaleup_policy: | |
| type: OS::Heat::ScalingPolicy | |
| properties: | |
| adjustment_type: change_in_capacity | |
| auto_scaling_group_id: {get_resource: asg} | |
| cooldown: 60 | |
| scaling_adjustment: 1 | |
| web_server_scaledown_policy: | |
| type: OS::Heat::ScalingPolicy | |
| properties: | |
| adjustment_type: change_in_capacity | |
| auto_scaling_group_id: {get_resource: asg} | |
| cooldown: 60 | |
| scaling_adjustment: -1 | |
| cpu_alarm_high: | |
| type: OS::Ceilometer::Alarm | |
| properties: | |
| description: Scale-up if the average CPU > 50% for 1 minute | |
| meter_name: cpu_util | |
| statistic: avg | |
| period: 60 | |
| evaluation_periods: 1 | |
| threshold: 50 | |
| alarm_actions: | |
| - {get_attr: [web_server_scaleup_policy, alarm_url]} | |
| matching_metadata: {'metadata.user_metadata.stack': {get_param: "OS::stack_id"}} | |
| comparison_operator: gt | |
| cpu_alarm_low: | |
| type: OS::Ceilometer::Alarm | |
| properties: | |
| description: Scale-down if the average CPU < 15% for 10 minutes | |
| meter_name: cpu_util | |
| statistic: avg | |
| period: 600 | |
| evaluation_periods: 1 | |
| threshold: 15 | |
| alarm_actions: | |
| - {get_attr: [web_server_scaledown_policy, alarm_url]} | |
| matching_metadata: {'metadata.user_metadata.stack': {get_param: "OS::stack_id"}} | |
| comparison_operator: lt | |
| monitor: | |
| type: OS::Neutron::HealthMonitor | |
| properties: | |
| type: TCP | |
| delay: 5 | |
| max_retries: 5 | |
| timeout: 5 | |
| pool: | |
| type: OS::Neutron::Pool | |
| properties: | |
| protocol: HTTP | |
| monitors: [{get_resource: monitor}] | |
| subnet_id: {get_param: subnet_id} | |
| lb_method: ROUND_ROBIN | |
| vip: | |
| protocol_port: 80 | |
| lb: | |
| type: OS::Neutron::LoadBalancer | |
| properties: | |
| protocol_port: 80 | |
| pool_id: {get_resource: pool} | |
| # assign a floating ip address to the load balancer | |
| # pool. | |
| lb_floating: | |
| type: OS::Neutron::FloatingIP | |
| properties: | |
| floating_network_id: {get_param: external_network_id} | |
| port_id: {get_attr: [pool, vip, port_id]} | |
| outputs: | |
| scale_up_url: | |
| description: > | |
| This URL is the webhook to scale up the autoscaling group. You | |
| can invoke the scale-up operation by doing an HTTP POST to this | |
| URL; no body nor extra headers are needed. | |
| value: {get_attr: [web_server_scaleup_policy, alarm_url]} | |
| scale_dn_url: | |
| description: > | |
| This URL is the webhook to scale down the autoscaling group. | |
| You can invoke the scale-down operation by doing an HTTP POST to | |
| this URL; no body nor extra headers are needed. | |
| value: {get_attr: [web_server_scaledown_policy, alarm_url]} | |
| pool_ip_address: | |
| value: {get_attr: [pool, vip, address]} | |
| description: The IP address of the load balancing pool | |
| website_url: | |
| value: | |
| str_replace: | |
| template: http://host/wordpress/ | |
| params: | |
| host: { get_attr: [lb_floating, floating_ip_address] } | |
| description: > | |
| This URL is the "external" URL that can be used to access the | |
| Wordpress site. | |
| ceilometer_query: | |
| value: | |
| str_replace: | |
| template: > | |
| ceilometer statistics -m cpu_util | |
| -q metadata.user_metadata.stack=stackval -p 600 -a avg | |
| params: | |
| stackval: { get_param: "OS::stack_id" } | |
| description: > | |
| This is a Ceilometer query for statistics on the cpu_util meter | |
| Samples about OS::Nova::Server instances in this stack. The -q | |
| parameter selects Samples according to the subject's metadata. | |
| When a VM's metadata includes an item of the form metering.X=Y, | |
| the corresponding Ceilometer resource has a metadata item of the | |
| form user_metadata.X=Y and samples about resources so tagged can | |
| be queried with a Ceilometer query term of the form | |
| metadata.user_metadata.X=Y. In this case the nested stacks give | |
| their VMs metadata that is passed as a nested stack parameter, | |
| and this stack passes a metadata of the form metering.stack=Y, | |
| where Y is this stack's ID. |