02__create_app_servers_and_alb.yml.md
The source files for this tutorial can be downloaded from its GitHub repository, or cloned into your current working directory using the command git clone https://github.com/ionos-cloud/module-ansible.git before changing into the module-ansible/docs/tutorials/07__introducing_the_application_load_balancer sub-directory.
01__create_jumpbox_and_nlb.yml
---
- hosts: localhost
connection: local
gather_facts: false
vars_files:
- ../vars.yml
- vars.yml
tasks:
# =======================================================================
- name: Get information about the datacenter '{{ datacenter_name }}'
ionoscloudsdk.ionoscloud.datacenter_info:
filters: { 'properties.name': '{{ datacenter_name }}' }
register: datacenter_info_response
- name: Get information about the LANs in '{{ datacenter_name }}'
ionoscloudsdk.ionoscloud.lan_info:
datacenter: "{{ datacenter_name }}"
register: lan_info_response
- name: Set the fact 'public_lan' based on the above
ansible.builtin.set_fact:
public_lan: "{{ (lan_info_response | json_query(query))[0] }}"
vars:
query: "lans[?properties.name=='public']"
- name: Set the fact 'secondary_lan' based on the above
ansible.builtin.set_fact:
secondary_lan: "{{ (lan_info_response | json_query(query))[0] }}"
vars:
query: "lans[?properties.name=='{{ lan.name }}']"
# =======================================================================
# Create the 'app servers' defined in 'server_config.app_server'
- name: Create the cloud-init file for our app servers
ansible.builtin.template:
src: templates/cloud-init--app-servers.j2
dest: cloud-init--app-servers.txt
- name: Create the app servers specified in server_config.app_server
ionoscloudsdk.ionoscloud.server:
datacenter: "{{ datacenter_name }}"
name: "{{ item.name }}"
cores: "{{ item.cores }}"
ram: "{{ item.ram }}"
cpu_family: "{{ datacenter_info_response.datacenters[0].properties.cpu_architecture[0].cpu_family }}"
disk_type: HDD
volume_size: "5"
image: "{{ image_alias }}"
image_password: "{{ default_password }}"
ssh_keys:
- "{{ ssh_public_key }}"
- "{{ lookup('file', 'temporary_id_rsa.pub') }}"
lan: "{{ secondary_lan.id }}"
nic_ips:
- "{{ item.ip }}"
user_data: "{{ lookup('file', item.user_data_file) | string | b64encode }}"
state: present
wait: true
wait_timeout: "{{ wait_timeout }}"
with_items: "{{ server_config.app_server }}"
register: create_app_server_response
# =======================================================================
# And finally create and minimally-configure an Application Load Balancer
- name: Get information about our reserved IP Blocks
ionoscloudsdk.ionoscloud.ipblock_info:
filters: "{ 'properties.name': 'IP Block for {{ datacenter_name }}' }"
register: ipblock_info_response
- name: Set 'ip_block' based on the above
ansible.builtin.set_fact:
ip_block: "{{ ipblock_info_response.ipblocks[0].properties.ips }}"
# Before we can create a forwarding rule, we need the list of destination IPs
- name: Set 'target_ips' based on 'create_app_server_response'
ansible.builtin.set_fact:
target_ips: "{{ create_app_server_response | json_query(query) }}"
vars:
query: "results[].machines[].entities.nics.items[].properties.ips"
# we need two separate set_fact calls to guarantee targets is initialised
# as an empty list before it is used in the second call...
- name: Create targets list
ansible.builtin.set_fact:
targets: []
- name: Add new JSON Objects to 'targets'
ansible.builtin.set_fact:
targets: "{{ targets +
[{ 'ip': item[0],
'port': '80',
'weight': '100',
'health_check_enabled': 'false',
'maintenance_enabled': 'false' }] }}"
loop: "{{ target_ips }}"
- name: Print target objects
ansible.builtin.debug:
var: targets
when: verbose_debugging
# see https://docs.ionos.com/ansible/api/application-load-balancer/target_group
- name: Create Target Group
ionoscloudsdk.ionoscloud.target_group:
name: "ALB HTTP target group"
algorithm: "ROUND_ROBIN"
protocol: "HTTP"
targets: "{{ targets }}"
# health_check:
# check_timeout: 2000
# check_interval: 1000
# retries: 3
# http_health_check:
# path: "./"
# method: "GET"
# match_type: "STATUS_CODE"
# response: 200
# regex: false
# negate: false
wait: true
register: target_group_response
# see https://docs.ionos.com/ansible/api/application-load-balancer
- name: Create the Application Load Balancer --- sometimes, this can take a while (up to 15 or so minutes), so please don't interrupt this operation...
ionoscloudsdk.ionoscloud.application_load_balancer:
datacenter: "{{ datacenter_name }}"
name: "{{ alb.name }}"
listener_lan: "{{ public_lan.id }}"
ips:
- "{{ ip_block[1] }}"
target_lan: "{{ secondary_lan.id }}"
lb_private_ips:
- "{{ alb.ip }}"
state: present
wait: true
wait_timeout: "{{ vnf_wait_timeout }}"
register: create_alb_response
- name: Print create_alb_response
ansible.builtin.debug:
var: create_alb_response
when: verbose_debugging
# see https://docs.ionos.com/ansible/api/application-load-balancer/application-load-balancer-rule
- name: Create Application Load Balancer Forwarding Rule for tcp/http
ionoscloudsdk.ionoscloud.application_load_balancer_forwardingrule:
name: "ALB HTTP connections"
algorithm: "ROUND_ROBIN"
protocol: "HTTP"
listener_ip: "{{ ip_block[1] }}"
listener_port: "80"
http_rules:
- name: "HTTP Rule"
type: "FORWARD"
target_group: "{{ target_group_response.target_group.id }}"
datacenter: "{{ datacenter_name }}"
application_load_balancer: "{{ create_alb_response.application_load_balancer.id }}"
wait: true
wait_timeout: "{{ vnf_wait_timeout }}"
register: alb_forwardingrule_response
- name: Print the newly-provisioned Load Balancer's public IP address
ansible.builtin.debug:
msg:
- "The ALB's IP address is {{ ip_block[1] }}. To see its forwarding rule in action, run the"
- "command `curl http://{{ ip_block[1] }}` two or more times _after_ you have configured"
- "the app-servers via `ansible-playbook -i inventory.yml 03__configure_app_servers.yml"
Last updated