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: app-servers
vars_files:
- vars.yml
tasks:
# Apply some basic network configurations needed, since these VMs are
# behind the NAT Gateway and don't have access to a 'full' DHCP server
- name: Set our default route
ansible.builtin.shell: "ip route add default via {{ nat_gateway.ip }} || true"
# Arguably not the most robust solution, but while an approach based upon,
# say, https://stackoverflow.com/a/67379573 would guarantee the resulting
# file is always valid, assuming the level of indention doesn't change,
# the following is simpler, and doesn't remove any comments that said file
# might contain
- name: Add our default route to /etc/netplan/50-cloud-init.yaml to make it persistent
blockinfile:
path: /etc/netplan/50-cloud-init.yaml
insertbefore: "match:"
block: |
<div data-gb-custom-block data-tag="filter" data-width='12' data-idth='12' data-first='true'>
routes:
- to: default
via: 192.168.8.1
</div>
- name: Ensure 'DNS=212.227.123.16 212.227.123.17' is in the '[Resolve]' section of /etc/systemd/resolved.conf
community.general.ini_file:
path: /etc/systemd/resolved.conf
section: Resolve
option: DNS
value: 212.227.123.16 212.227.123.17
state: present
- name: Restart the systemd-resolved service
ansible.builtin.service:
name: systemd-resolved
state: restarted
- name: Update repositories cache and upgrade the system
ansible.builtin.apt:
upgrade: dist
update_cache: yes
cache_valid_time: 3600
- name: Install nginx
ansible.builtin.package:
name:
- nginx
state: present
- name: And create our per-host index.html files on the remote servers
ansible.builtin.template:
src: templates/index.html.j2
dest: /var/www/html/index.html
