Expand a cloud template

After you create and test the basic Cloud Assembly template for the example application, you expand it into a multiple tier application that is deployable to development, test, and eventually production.

To expand the cloud template, you add the following enhancements.

• An option to cluster application servers for increased capacity
• A public-facing network and load balancer in front of the application servers
• A backup server with archive storage

Prerequisites

Create the basic cloud template and test it. See Create a basic cloud template and Test a basic cloud template.

Procedure

1. Click Cloud Templates, and open the WordPress-BP cloud template.
   The basic template appears, in the design canvas and code editor.
2. Make additions and changes, using the code example and figure for guidance.
   You use the GUI to drag new resources to the canvas, such as the load balancer, and then finish the configuration in the code editor.
   1. Add a count input prompt to make the WordPress application server into a cluster.
   2. Add a cloud agnostic load balancer.
   3. Connect the load balancer to the WordPress application server cluster.
   4. Add a cloud agnostic backup machine.
   5. Connect the backup machine to the private/internal network.
   6. Add a cloud agnostic public/external network.
   7. Connect the load balancer to the public network.
   8. Add a cloud agnostic storage volume for use as an archive disk.
   9. Connect the archive disk to the backup machine.
   10. Add an input prompt for the archive disk speed.
3. Deploy, test, and make changes in the same way that you did for the basic cloud template.
   You can update existing deployments, or even deploy new instances so that you can compare deployments.

   The goal is to reach a solid, repeatable template that can be used for production deployments.

   

   

Example: Completed expanded cloud template code example

formatVersion: 1
inputs: 
  env:
    type: string
    enum:
      - env:dev
      - env:prod
      - env:test
    default: env:dev
    title: Environment
    description: Target Environment
  size:
    type: string
    enum:
      - small
      - medium
      - large
    description: Size of Nodes
    title: Tier Machine Size
  username:
    type: string
    minLength: 4
    maxLength: 20
    pattern: '[a-z]+'
    title: Database Username
    description: Database Username
  userpassword:
    type: string
    pattern: '[a-z0-9A-Z@#$]+'
    encrypted: true
    title: Database Password
    description: Database Password
  count:
    type: integer
    default: 2
    maximum: 5
    minimum: 2
    title: WordPress Cluster Size
    description: WordPress Cluster Size (Number of Nodes)
  storagetype:
    type: string
    enum:
      - storage:general
      - storage:fast
    description: Archive Storage Disk Type
    title: Archive Disk Type
resources:
  WebTier:
    type: Cloud.Machine
    properties:
      name: wordpress
      image: ubuntu
      flavor: '${input.size}'
      count: '${input.count}'
      constraints:
        - tag: '${input.env}'
      networks:
        - network: '${resource["WP-Network-Private"].id}'
          assignPublicIpAddress: true
      cloudConfig: |
        #cloud-config
        repo_update: true
        repo_upgrade: all
        packages:
        - apache2
        - php
        - php-mysql
        - libapache2-mod-php
        - mysql-client
        - gcc
        - make
        - autoconf
        - libc-dev
        - pkg-config
        - libmcrypt-dev
        - php-pear
        - php-dev
        runcmd:
        - mkdir -p /var/www/html/mywordpresssite && cd /var/www/html && wget https://wordpress.org/latest.tar.gz && tar -xzf /var/www/html/latest.tar.gz -C /var/www/html/mywordpresssite --strip-components 1
        - i=0; while [ $i -le 10 ]; do mysql --connect-timeout=3 -h ${DBTier.networks[0].address} -u root -pmysqlpassword -e "SHOW STATUS;" && break || sleep 15; i=$((i+1)); done
        - mysql -u root -pmysqlpassword -h ${DBTier.networks[0].address} -e "create database wordpress_blog;"
        - mv /var/www/html/mywordpresssite/wp-config-sample.php /var/www/html/mywordpresssite/wp-config.php
        - pecl channel-update pecl.php.net
        - pecl update-channels
        - pecl install mcrypt
        - sed -i -e s/"define( 'DB_NAME', 'database_name_here' );"/"define( 'DB_NAME', 'wordpress_blog' );"/ /var/www/html/mywordpresssite/wp-config.php && sed -i -e s/"define( 'DB_USER', 'username_here' );"/"define( 'DB_USER', 'root' );"/ /var/www/html/mywordpresssite/wp-config.php && sed -i -e s/"define( 'DB_PASSWORD', 'password_here' );"/"define( 'DB_PASSWORD', 'mysqlpassword' );"/ /var/www/html/mywordpresssite/wp-config.php && sed -i -e s/"define( 'DB_HOST', 'localhost' );"/"define( 'DB_HOST', '${DBTier.networks[0].address}' );"/ /var/www/html/mywordpresssite/wp-config.php
        - sed -i '950i extension=mcrypt.so' /etc/php/7.4/apache2/php.ini
        - service apache2 reload
  DBTier:
    type: Cloud.Machine
    properties:
      name: mysql
      image: ubuntu
      flavor: '${input.size}'
      constraints:
        - tag: '${input.env}'
      networks:
        - network: '${resource["WP-Network-Private"].id}'
          assignPublicIpAddress: true
      remoteAccess:
        authentication: usernamePassword
        username: '${input.username}'
        password: '${input.userpassword}'
      cloudConfig: |
        #cloud-config
        repo_update: true
        repo_upgrade: all
        packages:
        - mysql-server
        runcmd:
        - sed -e '/bind-address/ s/^#*/#/' -i /etc/mysql/mysql.conf.d/mysqld.cnf
        - service mysql restart
        - mysql -e "CREATE USER 'root'@'%' IDENTIFIED BY 'mysqlpassword';" 
        - mysql -e "GRANT ALL PRIVILEGES ON *.* TO 'root'@'%';"
        - mysql -e "FLUSH PRIVILEGES;"
      attachedDisks: []
  LoadBalancer:
    type: Cloud.LoadBalancer
    properties:
      name: myapp-lb
      network: '${resource["WP-Network-Public"].id}'
      instances:
        - '${WebTier.id}'
      routes:
        - protocol: HTTP
          port: '80'
          instanceProtocol: HTTP
          instancePort: '80'
          healthCheckConfiguration:
            protocol: HTTP
            port: '80'
            urlPath: /mywordpresssite/wp-admin/install.php
            intervalSeconds: 6
            timeoutSeconds: 5
            unhealthyThreshold: 2
            healthyThreshold: 2
      internetFacing: true
  WP-Network-Private:
    type: Cloud.Network
    properties:
      name: WP-Network-Private
      networkType: existing
  WP-Network-Public:
    type: Cloud.Network
    properties:
      name: WP-Network-Public
      networkType: public
  backup:
    type: Cloud.Machine
    properties:
      name: backup
      flavor: '${input.size}'
      image: ubuntu
      networks:
        - network: '${resource["WP-Network-Private"].id}'
      attachedDisks:
        - source: '${resource.ArchiveDisk.id}'
  ArchiveDisk:
    type: Cloud.Volume
    properties:
      name: ArchiveDisk
      capacityGb: 5
      constraints:
        - tag: '${input.storagetype}'

What to do next

Define your own infrastructure and create your own cloud templates.

See Building your Cloud Assembly resource infrastructure and Designing your Cloud Assembly deployments.