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Merge pull request #37 from QuLogic/ansible-setup
Add an Ansible playbook for creating a droplet
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‎README.md

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@@ -38,6 +38,9 @@ prerequisites:
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* Create a DigitalOcean API token, and pass it to the inventory generator by
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setting the `DO_API_TOKEN` environment variable.
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* If you are creating a new droplet, and want to configure DNS as well, then
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create a CloudFlare API token, and pass it to the Ansible playbook by setting
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the `CLOUDFLARE_TOKEN` environment variable.
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* Set the vault decryption password of the Ansible vaulted file with our
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secrets. This may be done by setting the `ANSIBLE_VAULT_PASSWORD_FILE`
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environment variable to point to a file containing the password.
@@ -99,9 +102,11 @@ Naming
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We follow a simplified version of the naming scheme on [this blog
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post](https://mnx.io/blog/a-proper-server-naming-scheme/):
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* Servers are named `<prefix>.matplotlib.org` in A records.
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* Servers get a functional CNAME alias (e.g., `web01.matplotlib.org`).
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* matplotlib.org is a CNAME to the functional CNAME of a server.
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* Servers are named `<prefix>.matplotlib.org` in A records, pointing to the
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IPv4 address of the droplet.
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* Servers get a functional CNAME alias (e.g., `web01.matplotlib.org`) pointing
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to the hostname `<prefix>.matplotlib.org`.
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* matplotlib.org is a CNAME alias of the functional CNAME of a server.
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We use [planets in our Solar System](https://namingschemes.com/Solar_System)
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for the name prefix. When creating a new server, pick the next one in the list.
@@ -113,51 +118,34 @@ The summary of the initial setup is:
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1. Create the droplet with monitoring and relevant SSH keys.
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2. Assign new droplet to the matplotlib.org project and the Web firewall.
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3. Grab the SSH host fingerprints.
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4. Reboot.
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3. Add DNS entries pointing to the server on CloudFlare.
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4. Grab the SSH host fingerprints.
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5. Reboot.
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We currently use a simple $10 droplet from DigitalOcean. You can create one
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from the control panel, or using the `doctl` utility. Be sure to enable
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monitoring, and add the `website` tag and relevant SSH keys to the droplet. An
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example of using `doctl` is the following:
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We currently use a simple $12 droplet from DigitalOcean. You can create one
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from the control panel, or using the `create.yml` Ansible playbook:
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```
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doctl compute droplet create \
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--image fedora-35-x64 \
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--region tor1 \
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--size s-1vcpu-2gb \
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--ssh-keys <key-id>,<key-id> \
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--tag-name website \
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--enable-monitoring \
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venus.matplotlib.org
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ansible-playbook create.yml
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```
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Note, you will have to use `doctl compute ssh-key list` to get the IDs of the
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relevant SSH keys saved on DigitalOcean, and substitute them above. Save the ID
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of the new droplet from the output, e.g., in:
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This playbook will prompt you for 3 settings:
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```
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ID Name Public IPv4 Private IPv4 Public IPv6 Memory VCPUs Disk Region Image VPC UUID Status Tags Features Volumes
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294098687 mpl.org 2048 1 50 tor1 Fedora 35 x64 new website monitoring,droplet_agent
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```
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the droplet ID is 294098687.
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1. The host name of the droplet, which should follow the naming convention
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above.
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2. The functional CNAME alias of the droplet.
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3. The names of SSH keys to add to the droplet.
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You should also assign the new droplet to the `matplotlib.org` project and the
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`Web` firewall:
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You may also pass these directly to Ansible as:
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```
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doctl projects list
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# Get ID of the matplotlib.org project from the output.
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doctl projects resources assign <project-id> --resource=do:droplet:<droplet-id>
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doctl compute firewall list
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# Get ID of the Web firewall from the output.
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doctl compute firewall add-droplets <firewall-id> --droplet-ids <droplet-id>
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ansible-playbook create.yml --extra-vars "host=pluto functional=web99 ssh_keys='a b c'"
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```
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The playbook will create the server, as well as add DNS records on CloudFlare.
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Note, you must set `DO_API_TOKEN` and `CLOUDFLARE_TOKEN` in the environment to
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access these services.
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Then, to ensure you are connecting to the expected server, you should grab the
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SSH host keys via the DigitalOcean Droplet Console:
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@@ -181,14 +169,6 @@ Finally, you should reboot the droplet. This is due to a bug in cloud-init on
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DigitalOcean, which generates a new machine ID after startup, causing system
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logs to be seem invisible.
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DNS setup
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---------
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1. Add an A record for `<prefix>.matplotlib.org` to the IPv4 address of the new
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droplet.
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2. Add a CNAME record for `webNN.matplotlib.org` pointing to the given
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`<prefix.matplotlib.org>`.
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Running Ansible
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---------------
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‎collections/requirements.yml

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@@ -2,4 +2,5 @@
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collections:
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- name: ansible.posix
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- name: community.general
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version: ">=2.0.0"
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- name: community.digitalocean

‎create.yml

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---
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- hosts: localhost
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tasks:
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- name: Gather information about DigitalOcean droplets
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community.digitalocean.digital_ocean_droplet_info:
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register: do_droplets
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- name: Gather information about DigitalOcean SSH keys
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community.digitalocean.digital_ocean_sshkey_info:
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register: do_ssh_keys
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- name: Print info on existing droplets
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ansible.builtin.debug:
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msg: >-
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{{ item.name }}:
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{{ item.networks.v4 | map(attribute='ip_address') | join(',') }}
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loop: "{{ do_droplets.data }}"
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loop_control:
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label: "{{ item.id }}"
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- name: "Enter name for new droplet (subdomain only)"
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ansible.builtin.pause:
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register: input_name
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when: host is not defined
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- name: "Enter functional name for new droplet (webNN)"
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ansible.builtin.pause:
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register: input_functional
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when: functional is not defined
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- name: Print available SSH public keys
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ansible.builtin.debug:
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msg: "{{ item.name}} {{ item.fingerprint }}"
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loop: "{{ do_ssh_keys.data }}"
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loop_control:
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label: "{{ item.id }}"
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- name: "Enter SSH key names for new droplet (space separated)"
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ansible.builtin.pause:
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register: input_ssh_keys
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when: ssh_keys is not defined
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- name: Set droplet facts
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ansible.builtin.set_fact:
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host: >-
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{{
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(host if host is defined else input_name.user_input) |
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trim
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}}
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functional: >-
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{{
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(functional if functional is defined else input_functional.user_input) |
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trim
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}}
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ssh_fingerprints: >-
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{{
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do_ssh_keys.data |
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selectattr(
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'name',
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'in',
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(ssh_keys if ssh_keys is defined
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else input_ssh_keys.user_input) | split) |
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map(attribute='fingerprint')
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}}
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- name: Verify droplet configuration
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ansible.builtin.assert:
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that:
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- host in valid_planets
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# Must not be an existing name.
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- >-
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do_droplets.data |
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selectattr('name', 'equalto', '{{ host }}.matplotlib.org') |
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count == 0
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# TODO: Also check that functional name doesn't already exist.
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- functional is regex('^web[0-9][0-9]$')
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# At least 1 key, and same number as requested.
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- ssh_fingerprints | length >= 1
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- >-
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ssh_fingerprints | length == (
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ssh_keys if ssh_keys is defined
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else input_ssh_keys.user_input) | split | length
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- name: Print configuration
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ansible.builtin.debug:
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msg: "Creating droplet '{{ host }}' with SSH keys {{ ssh_fingerprints }}"
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- name: Please verify the above configuration
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ansible.builtin.pause:
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- name: Create droplet on DigitalOcean
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community.digitalocean.digital_ocean_droplet:
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state: present
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name: "{{ host }}.matplotlib.org"
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firewall:
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- Web
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image: fedora-39-x64
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monitoring: true
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project: matplotlib.org
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region: tor1
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size: s-1vcpu-2gb
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ssh_keys: "{{ ssh_fingerprints }}"
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tags:
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- website
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unique_name: true
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register: new_droplet
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- name: Setup DNS for droplet on CloudFlare
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community.general.cloudflare_dns:
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state: present
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proxied: true
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record: "{{ host }}"
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type: A
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value: >-
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{{
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new_droplet.data.droplet.networks.v4 |
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selectattr('type', 'equalto', 'public') |
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map(attribute='ip_address') |
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first
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}}
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zone: matplotlib.org
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- name: Setup functional DNS for droplet on CloudFlare
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community.general.cloudflare_dns:
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state: present
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proxied: true
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record: "{{ functional }}"
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type: CNAME
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value: "{{ host }}.matplotlib.org"
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zone: matplotlib.org
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vars:
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# We currently name servers based on planets in the Solar System.
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valid_planets:
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- mercury
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- venus
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- earth
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- mars
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- jupiter
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- saturn
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- uranus
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- neptune
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- pluto

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