Overview
The motivations for the new layout are related to bringing more flexibility to users and part of the process to Integrating Kubebuilder and Operator SDK.
What was changed
-
The
deploy
directory was replaced with theconfig
directory including a new layout of Kubernetes manifests files:- CRD manifests in
deploy/crds/
are now inconfig/crd/bases
- CR manifests in
deploy/crds/
are now inconfig/samples
- Controller manifest
deploy/operator.yaml
is now inconfig/manager/manager.yaml
- RBAC manifests in
deploy
are now inconfig/rbac/
- CRD manifests in
-
build/Dockerfile
is moved toDockerfile
in the project root directory -
The
molecule/
directory is now more aligned to Ansible and the new Layout
What is new
Scaffolded projects now use:
- kustomize to manage Kubernetes resources needed to deploy your operator
- A
Makefile
with helpful targets for build, test, and deployment, and to give you flexibility to tailor things to your project’s needs - Updated metrics configuration using kube-auth-proxy, a
--metrics-addr
flag, and kustomize-based deployment of a KubernetesService
and prometheus operatorServiceMonitor
How to migrate
The easy migration path is to a project from the scratch and let the tool scaffold the new layout. Then, add your customizations and implementations. See below for an example.
Creating a new project
In Kubebuilder-style projects, CRD groups are defined using two different flags
(--group
and --domain
).
When we initialize a new project, we need to specify the domain that all APIs in our project will share, so before creating the new project, we need to determine which domain we’re using for the APIs in our existing project.
To determine the domain, look at the spec.group
field in your CRDs in the
deploy/crds
directory.
The domain is everything after the first DNS segment. Using cache.example.com
as an
example, the --domain
would be example.com
.
So let’s create a new project with the same domain (example.com
):
mkdir memcached-operator
cd memcached-operator
operator-sdk init --plugins=ansible --domain=example.com
Now that we have our new project initialized, we need to recreate each of our APIs.
Using our API example from earlier (cache.example.com
), we’ll use cache
for the
--group
flag.
For --version
and --kind
, we use spec.versions[0].name
and spec.names.kind
, respectively.
For each API in the existing project, run:
operator-sdk create api \
--group=cache \
--version=v1 \
--kind=Memcached
Running the above command creates an empty roles/<kind>
. We can copy over the content of our old roles/<kind>
to the new one.
Migrating your Custom Resource samples
Update the CR manifests in config/samples
with the values of the CRs in your existing project which are in deploy/crds/<group>_<version>_<kind>_cr.yaml
In our example
the config/samples/cache_v1alpha1_memcached.yaml
will look like:
apiVersion: cache.example.com/v1alpha1
kind: Memcached
metadata:
name: memcached-sample
spec:
# Add fields here
size: 3
Migrating watches.yaml
Update the watches.yaml
file with your roles/playbooks
and check if you have custom options in the watches.yaml
file of your existing project. If so, update the new watches.yaml
file to match.
In our example, we will replace # FIXME: Specify the role or playbook for this resource.
with our previous role and it will look like:
---
# Use the 'create api' subcommand to add watches to this file.
- version: v1alpha1
group: cache.example.com
kind: Memcached
role: memcached
# +kubebuilder:scaffold:watch
NOTE: Do not remove the +kubebuilder:scaffold:watch
marker. It allows the tool to update the watches file when new APIs are created.
Migrating your Molecule tests
If you are using Molecule in your project will be required to port the tests for the new layout.
See that default structure changed from:
├── cluster
│ ├── converge.yml
│ ├── create.yml
│ ├── destroy.yml
│ ├── molecule.yml
│ ├── prepare.yml
│ └── verify.yml
├── default
│ ├── converge.yml
│ ├── molecule.yml
│ ├── prepare.yml
│ └── verify.yml
├── templates
│ └── operator.yaml.j2
└── test-local
├── converge.yml
├── molecule.yml
├── prepare.yml
└── verify.yml
To:
├── default
│ ├── converge.yml
│ ├── create.yml
│ ├── destroy.yml
│ ├── kustomize.yml
│ ├── molecule.yml
│ ├── prepare.yml
│ ├── tasks
│ │ └── foo_test.yml
│ └── verify.yml
└── kind
├── converge.yml
├── create.yml
├── destroy.yml
└── molecule.yml
Ensure that the provisioner.host_vars.localhost
has the following host_vars
:
....
host_vars:
localhost:
ansible_python_interpreter: '{{ ansible_playbook_python }}'
config_dir: ${MOLECULE_PROJECT_DIRECTORY}/config
samples_dir: ${MOLECULE_PROJECT_DIRECTORY}/config/samples
operator_image: ${OPERATOR_IMAGE:-""}
operator_pull_policy: ${OPERATOR_PULL_POLICY:-"Always"}
kustomize: ${KUSTOMIZE_PATH:-kustomize}
...
For more information read the Testing with Molecule.
Checking the Permissions (RBAC)
In your new project, roles are automatically generated in config/rbac/role.yaml
.
If you modified these permissions manually in deploy/role.yaml
in your existing
project, you need to re-apply them in config/rbac/role.yaml
.
New projects are configured to watch all namespaces by default, so they need a ClusterRole
to have the necessary permissions. Ensure that config/rbac/role.yaml
remains a ClusterRole
if you want to retain the default behavior of the new project conventions.
The following rules were used in earlier versions of anisible-operator to automatically create and manage services and servicemonitors
for metrics collection. If your operator’s don’t require these rules, they can safely be left out of the new config/rbac/role.yaml
file:
- apiGroups:
- monitoring.coreos.com
resources:
- servicemonitors
verbs:
- get
- create
- apiGroups:
- apps
resourceNames:
- memcached-operator
resources:
- deployments/finalizers
verbs:
- update
Configuring your Operator
If your existing project has customizations in deploy/operator.yaml
, they need to be ported to
config/manager/manager.yaml
. If you are passing custom arguments in your deployment, make sure to also update config/default/auth_proxy_patch.yaml
.
Note that the following environment variables are no longer used.
OPERATOR_NAME
is deprecated. It is used to define the name for a leader election config map. Operator authors should begin using--leader-election-id
instead.POD_NAME
has been removed. It was used to enable a particular pod to hold the leader election lock when the Ansible operator used the leader for life mechanism. Ansible operator now uses controller-runtime’s leader with lease mechanism.
Exporting metrics
If you are using metrics and would like to keep them exported you will need to configure
it in the config/default/kustomization.yaml
. Please see the metrics doc to know how you can perform this setup.
The default port used by the metric endpoint binds to was changed from :8383
to :8080
. To continue using port 8383
, specify --metrics-addr=:8383
when you start the operator.
Checking the changes
Finally, follow the steps in the “run the Operator” section to verify your project is running.
Note that, you also can troubleshooting by checking the container logs.
E.g $ kubectl logs deployment.apps/memcached-operator-controller-manager -n memcached-operator-system -c manager