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Merge pull request #1064 from stealthybox/azure

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Document Azure + Flux Installs
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Stefan Prodan 4 years ago committed by GitHub
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26
docs/guides/image-update.md
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@ -857,11 +857,11 @@ so that it can access GCR and download the json file.
Then create a secret, encrypt it using [Mozilla SOPS](mozilla-sops.md)
or [Sealed Secrets](sealed-secrets.md) , commit and push the encypted file to git.
```
kubectl create secret docker-registry <secret-name> \
--docker-server=<GCR-REGISTRY> \ # e.g gcr.io
--docker-username=_json_key \
--docker-password="$(cat <downloaded-json-file>)"
```sh
kubectl create secret docker-registry <secret-name> \
--docker-server=<GCR-REGISTRY> \ # e.g gcr.io
--docker-username=_json_key \
--docker-password="$(cat <downloaded-json-file>)"
```
### Azure Container Registry
@ -874,15 +874,7 @@ Note that the resulting ImagePullSecret for Flux could also be specified by Pods
#### Generating Tokens for Managed Identities [short-lived]
With [AAD Pod-Identity](https://azure.github.io/aad-pod-identity/docs/), we can create Pods that have their own
cloud credentials for accessing Azure services like ACR.
Your cluster should have `--enable-managed-identity` configured.
This software can be [installed via Helm](https://azure.github.io/aad-pod-identity/docs/getting-started/installation/) not managed by Azure.
Use Flux's `HelmRepository` and `HelmRelease` object to manage the aad-pod-identity installation from a bootstrap repository.
!!! As an alternative to Helm, the `--enable-aad-pod-identity` flag for the `az aks create` is currently in Preview.
Follow the Azure guide for [Creating an AKS cluster with AAD Pod Identity](https://docs.microsoft.com/en-us/azure/aks/use-azure-ad-pod-identity) if you would like to enable this feature with the Azure CLI.
As a pre-requisite, your AKS cluster will need [AAD Pod Identity](../use-cases/azure.md#aad-pod-identity) installed.
Once we have AAD Pod Identity installed, we can create a Deployment that frequently refreshes an image pull secret into
our desired Namespace.
@ -937,7 +929,8 @@ folder into your own repository or use a git submodule to vendor it if preferred
#### Using Static Credentials [long-lived]
!!! Using a static credential requires a Secrets management solution compatible with your GitOps workflow.
!!! info
Using a static credential requires a Secrets management solution compatible with your GitOps workflow.
Follow the official Azure documentation for [Creating an Image Pull Secret for ACR](https://docs.microsoft.com/en-us/azure/container-registry/container-registry-auth-kubernetes).
@ -949,4 +942,5 @@ Update the `ImageRepository.spec.secretRef` to point to it.
It is also possible to create [Repository Scoped Tokens](https://docs.microsoft.com/en-us/azure/container-registry/container-registry-repository-scoped-permissions).
!!! Note that this feature is in preview and does have limitations.
!!! warning
Repository Scoped Tokens are in preview and do have limitations.

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@ -336,22 +336,35 @@ If you don't specify the SSH algorithm, then `flux` will generate an RSA 2048 bi
Note that this implementation does not support shallow cloning, and it is therefore advised to only resort to this option if a
connection fails with the default configuration.
If you are using Azure DevOps you need to specify a different Git implementation than the default:
Azure DevOps [only supports RSA SSH keys](https://developercommunity.visualstudio.com/t/support-non-rsa-keys-for-ssh-authentication/365980),
you cannot use elliptic curve SSH keys like ecdsa or ed25519.
Here is how to specify the `libgit2` implementation and generate a proper RSA key:
```sh
flux create source git flux-system \
--git-implementation=libgit2 \
--ssh-key-algorithm=rsa \
--ssh-rsa-bits=4096 \
--url=ssh://git@ssh.dev.azure.com/v3/<org>/<project>/<repository> \
--branch=master \
--branch=main \
--interval=1m
```
This config uses the `main` branch, but your repo may be older and need to specify `master` instead.
Note that unlike `git`, Flux does not support the
["shorter" scp-like syntax for the SSH protocol](https://git-scm.com/book/en/v2/Git-on-the-Server-The-Protocols#_the_ssh_protocol)
(e.g. `ssh.dev.azure.com:v3`).
Use the [RFC 3986 compatible syntax](https://tools.ietf.org/html/rfc3986#section-3) instead: `ssh.dev.azure.com/v3`.
If you wish to use Git over HTTPS, then generated a personal access token and supply it as the password:
The `flux create source git` command will prompt you to add a deploy key to your repository, but Azure DevOps
[does not support repository or org-specific deploy keys](https://developercommunity.visualstudio.com/t/allow-the-creation-of-ssh-deploy-keys-for-vsts-hos/365747).
You may add the deploy key to a user's personal SSH keys being mindful that removing them from the repo may revoke Flux's access.
As an alternative, create a machine-user whose sole purpose is to store credentials for automation.
Using a machine-user also has the benefit of being able to be read-only or restricted to specific repositories if that is needed.
If you wish to use Git over HTTPS, then generate a personal access token and supply it as the password:
```sh
flux create source git flux-system \
@ -359,12 +372,15 @@ If you don't specify the SSH algorithm, then `flux` will generate an RSA 2048 bi
--url=https://dev.azure.com/<org>/<project>/_git/<repository> \
--branch=master \
--username=git \
--password=token \
--password=${AZ_PAT_TOKEN} \
--interval=1m
```
Please consult the [Azure DevOps documentation](https://docs.microsoft.com/en-us/azure/devops/organizations/accounts/use-personal-access-tokens-to-authenticate?view=azure-devops&tabs=preview-page)
on how to generate personal access tokens for Git repositories.
Azure DevOps PAT's always have an expiration date, so be sure to have some process for renewing or updating these tokens.
Similar to the lack of repo-specific deploy keys, a user needs to generate a user-specific PAT.
If you are using a machine-user, you can generate a PAT or simply use the machine-user's password which does not expire.
If your Git server supports basic auth, you can set the URL to HTTPS and specify the credentials with:

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@ -213,9 +213,92 @@ IAM Role example:
#### Azure
When using Azure Key Vault you need to authenticate the kustomize controller either by passing
[Service Principal credentials as environment variables](https://github.com/mozilla/sops#encrypting-using-azure-key-vault)
or with [add-pod-identity](https://github.com/Azure/aad-pod-identity).
When using Azure Key Vault you need to authenticate kustomize-controller either with [add-pod-identity](../use-cases/azure.md#aad-pod-identity)
or by passing [Service Principal credentials as environment variables](https://github.com/mozilla/sops#encrypting-using-azure-key-vault).
Create the Azure Key-Vault:
```sh
export VAULT_NAME="fluxcd-$(uuidgen | tr -d - | head -c 16)"
export KEY_NAME="sops-cluster0"
az keyvault create --name "${VAULT_NAME}"
az keyvault key create --name "${KEY_NAME}" \
--vault-name "${VAULT_NAME}"
--protection software \
--ops encrypt decrypt
az keyvault key show --name "${KEY_NAME}" \
--vault-name "${VAULT_NAME}" \
--query key.kid
```
If using AAD Pod-Identity, create an identity within Azure to bind against, then create an `AzureIdentity` object to match:
```yaml
# Create an identity in Azure and assign it a role to access Key Vault (note: the identity's resourceGroup should match the desired Key Vault):
# az identity create -n sops-akv-decryptor
# az role assignment create --role "Key Vault Crypto User" --assignee-object-id "$(az identity show -n sops-akv-decryptor -o tsv --query principalId)"
# Fetch the clientID and resourceID to configure the AzureIdentity spec below:
# az identity show -n sops-akv-decryptor -otsv --query clientId
# az identity show -n sops-akv-decryptor -otsv --query resourceId
---
apiVersion: aadpodidentity.k8s.io/v1
kind: AzureIdentity
metadata:
name: sops-akv-decryptor # kustomize-controller label will match this name
namespace: flux-system
spec:
clientID: 58027844-6b86-424b-9888-b5ae2dc28b4f
resourceID: /subscriptions/8c69185e-55f9-4d00-8e71-a1b1bb1386a1/resourcegroups/stealthybox/providers/Microsoft.ManagedIdentity/userAssignedIdentities/sops-akv-decryptor
type: 0 # user-managed identity
```
[Customize your Flux Manifests](../guides/installation.md#customize-flux-manifests) so that kustomize-controller has the proper credentials.
Patch the kustomize-controller Pod template so that the label matches the `AzureIdentity` name.
Additionally, the SOPS specific environment variable `AZURE_AUTH_METHOD=msi` to activate the proper auth method within kustomize-controller.
```yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: kustomize-controller
namespace: flux-system
spec:
template:
metadata:
labels:
aadpodidbinding: sops-akv-decryptor # match the AzureIdentity name
spec:
containers:
- name: manager
env:
- name: AZURE_AUTH_METHOD
value: msi
```
Alternatively, if using a Service Principal stored in a K8s Secret, patch the Pod's envFrom to reference the `AZURE_TENANT_ID`/`AZURE_CLIENT_ID`/`AZURE_CLIENT_SECRET`
fields from your Secret.
```yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: kustomize-controller
namespace: flux-system
spec:
template:
spec:
containers:
- name: manager
envFrom:
- secretRef:
name: sops-akv-decryptor-service-principal
```
At this point, kustomize-controller is now authorized to decrypt values in SOPS encrypted files from your Sources via the related Key Vault.
See Mozilla's guide to [Encrypting Using Azure Key Vault](https://github.com/mozilla/sops#encrypting-using-azure-key-vault) to get started
committing encrypted files to your Git Repository or other Sources.
#### Google Cloud

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docs/index.md
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@ -48,7 +48,7 @@ the API.
## Where do I start?
!!!hint "Get started with Flux v2!"
!!! hint "Get started with Flux v2!"
Following this [guide](get-started/index.md) will just take a couple of minutes to complete:
After installing the `flux` CLI and running a couple of very simple commands,
you will have a GitOps workflow setup which involves a staging and a production cluster.

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docs/use-cases/azure.md
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@ -0,0 +1,112 @@
# Using Flux on Azure
## AKS Cluster Options
It's important to follow some guidelines when installing Flux on AKS.
### CNI and Network Policy
Previously, there has been an issue with Flux and Network Policy on AKS. ([Upstream Azure Issue](https://github.com/Azure/AKS/issues/2031)) ([Flux Issue](https://github.com/fluxcd/flux2/issues/703))
If you ensure your AKS cluster is upgraded, and your Nodes have been restarted with the most recent Node images, this could
resolve flux reconciliation failures where source-controller is unreachable.
Using `--network-plugin=azure --network-policy=calico` has been tested to work properly.
This issue only affects you if you are using `--network-policy` on AKS, which is not a default option.
!!! warning
AKS `--network-policy` is currently in Preview
### AAD Pod-Identity
Depending on the features you are interested in using with Flux, you may want to install AAD Pod Identity.
With [AAD Pod-Identity](https://azure.github.io/aad-pod-identity/docs/), we can create Pods that have their own
cloud credentials for accessing Azure services like Azure Container Registry(ACR) and Azure Key Vault(AKV).
If you do not use AAD Pod-Identity, you'll need to manage and store Service Principal credentials in K8s Secrets, to integrate Flux
with other Azure Services.
As a pre-requisite, your cluster must have `--enable-managed-identity` configured.
This software can be [installed via Helm](https://azure.github.io/aad-pod-identity/docs/getting-started/installation/) (unmanaged by Azure).
Use Flux's `HelmRepository` and `HelmRelease` object to manage the aad-pod-identity installation from a bootstrap repository and keep it up to date.
!!! note
As an alternative to Helm, the `--enable-aad-pod-identity` flag for the `az aks create` is currently in Preview.
Follow the Azure guide for [Creating an AKS cluster with AAD Pod Identity](https://docs.microsoft.com/en-us/azure/aks/use-azure-ad-pod-identity) if you would like to enable this feature with the Azure CLI.
### Cluster Creation
!!! info
When working with the Azure CLI, it can help to set a default `location`, `group`, and `acr`.
See `az configure --help`, `az configure --list-defaults`, and `az configure --defaults key=value`
The following creates an AKS cluster with some minimal configuration that will work well with Flux:
```sh
az aks create \
--network-plugin="azure" \
--network-policy="calico" \
--enable-managed-identity \
--enable-pod-identity \
--name="my-cluster"
```
## Flux Installation with Azure DevOps Repos
Ensure you can login to [https://dev.azure.com](dev.azure.com) for your proper organization, and create a new repo to hold your
flux install and other necessary config.
There is no bootstrap provider currently for Azure DevOps Repos,
but you can clone your Azure Repo, then use the [Generic Git Server](../guides/installation.md#generic-git-server)
guide to manually bootstrap Flux. (It must be a Git repo; TFVC Repos are not supported by source-controller)
Take note of the Azure DevOps specific section within the guide.
If you use the generated SSH deploy key from `flux create source git`, ensure it is an RSA key (not an elliptic curve).
Make sure to use the `libgit2` provider for all `GitRepository` objects fetching from Azure Repos since they use Git Protocol v2.
Whether you're using the generated SSH deploy key or a Personal Access Token, the credentials used by
Flux will need to be owned by an Azure DevOps User with access to the repo.
Consider creating a machine-user and granting it granular permissions to access what's needed.
This allows changing user access without affecting Flux.
Since PAT's expire on Azure DevOps, using a machine-user's login password to authenticate with HTTPS and `libgit2`
can be a good option that avoids the need to renew the credential while also having the benefit of more granular permissions.
## Helm Repositories on Azure Container Registry
The Flux `HelmRepository` object currently supports [Chart Repositories](https://helm.sh/docs/topics/chart_repository/)
as well as fetching `HelmCharts` from paths in `GitRepository` sources.
Azure Container Registry has a sub-command ([`az acr helm`](https://docs.microsoft.com/en-us/cli/azure/acr/helm)) for working with
ACR-Hosted Chart Repositories, but it is deprecated.
If you are using these deprecated Azure Chart Repositories, you can use Flux `HelmRepository` objects with them.
[Newer ACR Helm documentation](https://docs.microsoft.com/en-us/azure/container-registry/container-registry-helm-repos) suggests
using ACR as an experimental [Helm OCI Registry](https://helm.sh/docs/topics/registries/).
This will not work with Flux, because using Charts from OCI Registries is not yet supported.
## Secrets Management with SOPS and Azure Key Vault
You will need to create an Azure Key Vault and bind a credential such as a Service Principal or Managed Identity to it.
If you want to use Managed Identities, install or enable [AAD Pod Identity](#aad-pod-identity).
Patch kustomize-controller with the proper Azure credentials, so that it may access your Azure Key Vault, and then begin
committing SOPS encrypted files to the Git repository with the proper Azure Key Vault configuration.
See the [Mozilla SOPS Azure Guide](../guides/azure.md) for further detail.
## Image Updates with Azure Container Registry
You will need to create an ACR registry and bind a credential such as a Service Principal or Managed Identity to it.
If you want to use Managed Identities, install or enable [AAD Pod Identity](#aad-pod-identity).
You may need to update your Flux install to include additional components:
```sh
flux install \
--components-extra="image-reflector-controller,image-automation-controller" \
--export > ./clusters/my-cluster/flux-system/gotk-components.yaml
```
Follow the [Image Update Automation Guide](../guides/image-update.md) and see the
[ACR specific section](../guides/image-update.md#azure-container-registry) for more details.
Your AKS cluster's configuration can also be updated to [allow the kubelets to pull images from ACR](https://docs.microsoft.com/en-us/azure/aks/cluster-container-registry-integration)
without ImagePullSecrets as an optional, complimentary step.

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@ -64,6 +64,8 @@ nav:
- Mozilla SOPS: guides/mozilla-sops.md
- Automate image updates to Git: guides/image-update.md
- Sortable image tags to use with automation: guides/sortable-image-tags.md
- Use Cases:
- Azure: use-cases/azure.md
- Toolkit Components:
- Overview: components/index.md
- Source Controller:

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