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Update docs on using Butane snippets for customization 

* Typhoon now consistently uses Butane Configs for snippets
(variant `fcos` or `flatcar`). Previously snippets were either
Butane Configs (on FCOS) or Container Linux Configs (on Flatcar)
* Update docs on uploading Flatcar Linux DigitalOcean images
* Update docs on uploading Fedora CoreOS Azure images
This commit is contained in:
Dalton Hubble 2022-08-03 20:24:40 -07:00
parent 4a469513dd
commit 16c2785878
4 changed files with 87 additions and 108 deletions
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115
docs/advanced/customization.md
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@ -12,9 +12,11 @@ Clusters are kept to a minimal Kubernetes control plane by offering components l
## Hosts ## Hosts
Typhoon uses the [Ignition](https://github.com/coreos/ignition) system of Fedora CoreOS and Flatcar Linux to immutably declare a system via first-boot disk provisioning. Fedora CoreOS uses a [Butane Config](https://coreos.github.io/butane/specs/) and Flatcar Linux uses a [Container Linux Config](https://github.com/coreos/container-linux-config-transpiler/blob/master/doc/examples.md) (CLC). These define disk partitions, filesystems, systemd units, dropins, config files, mount units, raid arrays, and users. ### Background
Controller and worker instances form a minimal and secure Kubernetes cluster on each platform. Typhoon provides the **snippets** feature to accept Butane or Container Linux Configs to validate and additively merge into instance declarations. This allows advanced host customization and experimentation. Typhoon uses the [Ignition](https://github.com/coreos/ignition) system of Fedora CoreOS and Flatcar Linux to immutably declare a system via first-boot disk provisioning. Human-friendly [Butane Configs](https://coreos.github.io/butane/specs/) define disk partitions, filesystems, systemd units, dropins, config files, mount units, raid arrays, users, and more before being converted to Ignition.
Controller and worker instances form a minimal and secure Kubernetes cluster on each platform. Typhoon provides the **snippets** feature to accept custom Butane Configs that are merged with instance declarations. This allows advanced host customization and experimentation.
!!! note !!! note
Snippets cannot be used to modify an already existing instance, the antithesis of immutable provisioning. Ignition fully declares a system on first boot only. Snippets cannot be used to modify an already existing instance, the antithesis of immutable provisioning. Ignition fully declares a system on first boot only.
@ -25,17 +27,16 @@ Controller and worker instances form a minimal and secure Kubernetes cluster on
!!! danger !!! danger
Edits to snippets for controller instances can (correctly) cause Terraform to observe a diff (if not otherwise suppressed) and propose destroying and recreating controller(s). Recognize that this is destructive since controllers run etcd and are stateful. See [blue/green](/topics/maintenance/#upgrades) clusters. Edits to snippets for controller instances can (correctly) cause Terraform to observe a diff (if not otherwise suppressed) and propose destroying and recreating controller(s). Recognize that this is destructive since controllers run etcd and are stateful. See [blue/green](/topics/maintenance/#upgrades) clusters.
### Fedora CoreOS ### Usage
!!! note
Fedora CoreOS snippets require `terraform-provider-ct` v0.5+
Define a Butane Config ([docs](https://coreos.github.io/butane/specs/), [config](https://github.com/coreos/butane/blob/main/docs/config-fcos-v1_4.md)) in version control near your Terraform workspace directory (e.g. perhaps in a `snippets` subdirectory). You may organize snippets into multiple files, if desired. Define a Butane Config ([docs](https://coreos.github.io/butane/specs/), [config](https://github.com/coreos/butane/blob/main/docs/config-fcos-v1_4.md)) in version control near your Terraform workspace directory (e.g. perhaps in a `snippets` subdirectory). You may organize snippets into multiple files, if desired.
For example, ensure an `/opt/hello` file is created with permissions 0644. For example, ensure an `/opt/hello` file is created with permissions 0644 before boot.
=== "Fedora CoreOS"
```yaml ```yaml
# custom-files # custom-files.yaml
variant: fcos variant: fcos
version: 1.4.0 version: 1.4.0
storage: storage:
@ -47,68 +48,33 @@ storage:
mode: 0644 mode: 0644
``` ```
Reference the FCC contents by location (e.g. `file("./custom-units.yaml")`). On [AWS](/fedora-coreos/aws/#cluster) or [Google Cloud](/fedora-coreos/google-cloud/#cluster) extend the `controller_snippets` or `worker_snippets` list variables. === "Flatcar Linux"
```tf
module "nemo" {
...
controller_count = 1
worker_count = 2
controller_snippets = [
file("./custom-files"),
file("./custom-units"),
]
worker_snippets = [
file("./custom-files"),
file("./custom-units")",
]
...
}
```
On [Bare-Metal](/fedora-coreos/bare-metal/#cluster), different FCCs may be used for each node (since hardware may be heterogeneous). Extend the `snippets` map variable by mapping a controller or worker name key to a list of snippets.
```tf
module "mercury" {
...
snippets = {
"node2" = [file("./units/hello.yaml")]
"node3" = [
file("./units/world.yaml"),
file("./units/hello.yaml"),
]
}
...
}
```
### Flatcar Linux
Define a Container Linux Config (CLC) ([config](https://github.com/coreos/container-linux-config-transpiler/blob/master/doc/configuration.md), [examples](https://github.com/coreos/container-linux-config-transpiler/blob/master/doc/examples.md)) in version control near your Terraform workspace directory (e.g. perhaps in a `snippets` subdirectory). You may organize snippets into multiple files, if desired.
For example, ensure an `/opt/hello` file is created with permissions 0644.
```yaml ```yaml
# custom-files # custom-files.yaml
variant: flatcar
version: 1.0.0
storage: storage:
files: files:
- path: /opt/hello - path: /opt/hello
filesystem: root
contents: contents:
inline: | inline: |
Hello World Hello World
mode: 0644 mode: 0644
``` ```
Or ensure a systemd unit `hello.service` is created and a dropin `50-etcd-cluster.conf` is added for `etcd-member.service`. Or ensure a systemd unit `hello.service` is created.
=== "Fedora CoreOS"
```yaml ```yaml
# custom-units # custom-units.yaml
variant: fcos
version: 1.4.0
systemd: systemd:
units: units:
- name: hello.service - name: hello.service
enable: true enabled: true
contents: | contents: |
[Unit] [Unit]
Description=Hello World Description=Hello World
@ -117,35 +83,48 @@ systemd:
ExecStart=/usr/bin/echo Hello World! ExecStart=/usr/bin/echo Hello World!
[Install] [Install]
WantedBy=multi-user.target WantedBy=multi-user.target
- name: etcd-member.service
enable: true
dropins:
- name: 50-etcd-cluster.conf
contents: |
Environment="ETCD_LOG_PACKAGE_LEVELS=etcdserver=WARNING,security=DEBUG"
``` ```
Reference the CLC contents by location (e.g. `file("./custom-units.yaml")`). On [AWS](/flatcar-linux/aws/#cluster), [Azure](/flatcar-linux/azure/#cluster), [DigitalOcean](/flatcar-linux/digital-ocean/#cluster), or [Google Cloud](/flatcar-linux/google-cloud/#cluster) extend the `controller_snippets` or `worker_snippets` list variables. === "Flatcar Linux"
```yaml
# custom-units.yaml
variant: flatcar
version: 1.0.0
systemd:
units:
- name: hello.service
enabled: true
contents: |
[Unit]
Description=Hello World
[Service]
Type=oneshot
ExecStart=/usr/bin/echo Hello World!
[Install]
WantedBy=multi-user.target
```
Reference the Butane contents by location (e.g. `file("./custom-units.yaml")`). On [AWS](/fedora-coreos/aws/#cluster), [Azure](/fedora-coreos/azure/#cluster), [DigitalOcean](/fedora-coreos/digital-ocean/#cluster), or [Google Cloud](/fedora-coreos/google-cloud/#cluster) extend the `controller_snippets` or `worker_snippets` list variables.
```tf ```tf
module "nemo" { module "nemo" {
... ...
controller_count = 1
worker_count = 2 worker_count = 2
controller_snippets = [ controller_snippets = [
file("./custom-files"), file("./custom-files.yaml"),
file("./custom-units"), file("./custom-units.yaml"),
] ]
worker_snippets = [ worker_snippets = [
file("./custom-files"), file("./custom-files.yaml"),
file("./custom-units")", file("./custom-units.yaml")",
] ]
... ...
} }
``` ```
On [Bare-Metal](/flatcar-linux/bare-metal/#cluster), different CLCs may be used for each node (since hardware may be heterogeneous). Extend the `snippets` map variable by mapping a controller or worker name key to a list of snippets. On [Bare-Metal](/fedora-coreos/bare-metal/#cluster), different Butane configs may be used for each node (since hardware may be heterogeneous). Extend the `snippets` map variable by mapping a controller or worker name key to a list of snippets.
```tf ```tf
module "mercury" { module "mercury" {

2
docs/architecture/operating-systems.md
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@ -19,7 +19,7 @@ Together, they diversify Typhoon to support a range of container technologies.
| Kernel | ~5.10.x | ~5.16.x | | Kernel | ~5.10.x | ~5.16.x |
| systemd | 249 | 249 | | systemd | 249 | 249 |
| Username | core | core | | Username | core | core |
| Ignition system | Ignition v2.x spec | Ignition v3.x spec | | Ignition system | Ignition v3.x spec | Ignition v3.x spec |
| storage driver | overlay2 (extfs) | overlay2 (xfs) | | storage driver | overlay2 (extfs) | overlay2 (xfs) |
| logging driver | json-file | journald | | logging driver | json-file | journald |
| cgroup driver | systemd | systemd | | cgroup driver | systemd | systemd |

10
docs/fedora-coreos/azure.md
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@ -64,18 +64,18 @@ Additional configuration options are described in the `azurerm` provider [docs](
Fedora CoreOS publishes images for Azure, but does not yet upload them. Azure allows custom images to be uploaded to a storage account bucket and imported. Fedora CoreOS publishes images for Azure, but does not yet upload them. Azure allows custom images to be uploaded to a storage account bucket and imported.
[Download](https://getfedora.org/en/coreos/download?tab=cloud_operators&stream=stable) a Fedora CoreOS Azure VHD image and upload it to an Azure storage account container (i.e. bucket) via the UI (quite slow). [Download](https://getfedora.org/en/coreos/download?tab=cloud_operators&stream=stable) a Fedora CoreOS Azure VHD image, decompress it, and upload it to an Azure storage account container (i.e. bucket) via the UI (quite slow).
``` ```
xz -d fedora-coreos-31.20200323.3.2-azure.x86_64.vhd.xz xz -d fedora-coreos-36.20220716.3.1-azure.x86_64.vhd.xz
``` ```
Create an Azure disk (note disk ID) and create an Azure image from it (note image ID). Create an Azure disk (note disk ID) and create an Azure image from it (note image ID).
``` ```
az disk create --name fedora-coreos-31.20200323.3.2 -g GROUP --source https://BUCKET.blob.core.windows.net/fedora-coreos/fedora-coreos-31.20200323.3.2-azure.x86_64.vhd az disk create --name fedora-coreos-36.20220716.3.1 -g GROUP --source https://BUCKET.blob.core.windows.net/fedora-coreos/fedora-coreos-36.20220716.3.1-azure.x86_64.vhd
az image create --name fedora-coreos-31.20200323.3.2 -g GROUP --os-type=linux --source /subscriptions/some/path/providers/Microsoft.Compute/disks/fedora-coreos-31.20200323.3.2 az image create --name fedora-coreos-36.20220716.3.1 -g GROUP --os-type=linux --source /subscriptions/some/path/providers/Microsoft.Compute/disks/fedora-coreos-36.20220716.3.1
``` ```
Set the [os_image](#variables) in the next step. Set the [os_image](#variables) in the next step.
@ -95,7 +95,7 @@ module "ramius" {
dns_zone_group = "example-group" dns_zone_group = "example-group"
# configuration # configuration
os_image = "/subscriptions/some/path/Microsoft.Compute/images/fedora-coreos-31.20200323.3.2" os_image = "/subscriptions/some/path/Microsoft.Compute/images/fedora-coreos-36.20220716.3.1"
ssh_authorized_key = "ssh-ed25519 AAAAB3Nz..." ssh_authorized_key = "ssh-ed25519 AAAAB3Nz..."
# optional # optional

8
docs/flatcar-linux/digitalocean.md
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@ -63,13 +63,13 @@ terraform {
### Flatcar Linux Images ### Flatcar Linux Images
Flatcar Linux publishes DigitalOcean images, but does not yet upload them. DigitalOcean allows [custom images](https://blog.digitalocean.com/custom-images/) to be uploaded via URLor file. Flatcar Linux publishes DigitalOcean images, but does not yet upload them. DigitalOcean allows [custom images](https://blog.digitalocean.com/custom-images/) to be uploaded via a URL or file.
[Download](https://www.flatcar-linux.org/releases/) the Flatcar Linux DigitalOcean bin image. Rename the image with the channel and version (to refer to these images over time) and [upload](https://cloud.digitalocean.com/images/custom_images) it as a custom image. Choose a Flatcar Linux [release](https://www.flatcar-linux.org/releases/) from Flatcar's file [server](https://stable.release.flatcar-linux.net/amd64-usr/). Copy the URL to the `flatcar_production_digitalocean_image.bin.bz2`, import it into DigitalOcean, and name it as a custom image. Add a data reference to the image in Terraform:
```tf ```tf
data "digitalocean_image" "flatcar-stable-2303-4-0" { data "digitalocean_image" "flatcar-stable-3227-2-0" {
name = "flatcar-stable-2303.4.0.bin.bz2" name = "flatcar-stable-3227.2.0.bin.bz2"
} }
``` ```