Maestro is a system to leverage CloudEvents to transport Kubernetes resources to the target clusters, and then transport the resource status back. The resources are stored in a database and the status is updated in the database as well. The system is composed of two parts: the Maestro server and the Maestro agent.
- The Maestro server is responsible for storing the resources and their status. And sending the resources to the message broker in the CloudEvents format. The Maestro server provides Resful APIs and gRPC APIs to manage the resources.
- Maestro agent is responsible for receiving the resources and applying them to the target clusters. And reporting back the status of the resources.
# 1. build the project
$ go install gotest.tools/gotestsum@latest
$ make binary
# 2. run a postgres database locally in docker
$ make db/setup
$ make db/login
root@f076ddf94520:/# psql -h localhost -U maestro maestro
psql (14.4 (Debian 14.4-1.pgdg110+1))
Type "help" for help.
maestro=# \dt
Did not find any relations.
# 3. run a mqtt broker locally in docker
$ make mqtt/setup
The initial migration will create the base data model as well as providing a way to add future migrations.
# Run migrations
./maestro migration
# Verify they ran in the database
$ make db/login
root@f076ddf94520:/# psql -h localhost -U maestro maestro
psql (14.4 (Debian 14.4-1.pgdg110+1))
Type "help" for help.
maestro=# \dt
List of relations
Schema | Name | Type | Owner
--------+------------+-------+---------------------
public | resources | table | maestro
public | events | table | maestro
public | migrations | table | maestro
(3 rows)
make test
make test-integration
make e2e-test
make run
To verify that the server is working use the curl command:
curl http://localhost:8000/api/maestro/v1/resources | jq
That should return a 401 response like this, because it needs authentication:
{
"kind": "Error",
"id": "401",
"href": "/api/maestro/errors/401",
"code": "API-401",
"reason": "Request doesn't contain the 'Authorization' header or the 'cs_jwt' cookie"
}
Authentication in the default configuration is done through the RedHat SSO, so you need to login with a Red Hat customer portal user in the right account (created as part of the onboarding doc) and then you can retrieve the token to use below on https://console.redhat.com/openshift/token To authenticate, use the ocm tool against your local service. The ocm tool is available on https://console.redhat.com/openshift/downloads
ocm login --token=${OCM_ACCESS_TOKEN} --url=http://localhost:8000
This will be empty if no Resource is ever created
ocm get /api/maestro/v1/resources
{
"items": [],
"kind": "ResourceList",
"page": 1,
"size": 0,
"total": 0
}
ocm post /api/maestro/v1/resources << EOF
{
"consumer_name": "cluster1",
"version": 1,
"manifest": {
"apiVersion": "apps/v1",
"kind": "Deployment",
"metadata": {
"name": "nginx",
"namespace": "default"
},
"spec": {
"replicas": 1,
"selector": {
"matchLabels": {
"app": "nginx"
}
},
"template": {
"metadata": {
"labels": {
"app": "nginx"
}
},
"spec": {
"containers": [
{
"image": "nginxinc/nginx-unprivileged",
"name": "nginx"
}
]
}
}
}
}
}
EOF
ocm get /api/maestro/v1/resources
{
"items": [
{
"consumer_name": "cluster1",
"created_at": "2023-11-23T09:26:13.43061Z",
"href": "/api/maestro/v1/resources/f428e21d-71cb-47a4-8d7f-82a65d9a4048",
"id": "f428e21d-71cb-47a4-8d7f-82a65d9a4048",
"kind": "Resource",
"manifest": {
"apiVersion": "apps/v1",
"kind": "Deployment",
"metadata": {
"name": "nginx",
"namespace": "default"
},
"spec": {
"replicas": 1,
"selector": {
"matchLabels": {
"app": "nginx"
}
},
"template": {
"metadata": {
"labels": {
"app": "nginx"
}
},
"spec": {
"containers": [
{
"image": "nginxinc/nginx-unprivileged",
"name": "nginx"
}
]
}
}
}
},
"status": {
"ContentStatus": {
"availableReplicas": 1,
"conditions": [
{
"lastTransitionTime": "2023-11-23T07:05:50Z",
"lastUpdateTime": "2023-11-23T07:05:50Z",
"message": "Deployment has minimum availability.",
"reason": "MinimumReplicasAvailable",
"status": "True",
"type": "Available"
},
{
"lastTransitionTime": "2023-11-23T07:05:47Z",
"lastUpdateTime": "2023-11-23T07:05:50Z",
"message": "ReplicaSet \"nginx-5d6b548959\" has successfully progressed.",
"reason": "NewReplicaSetAvailable",
"status": "True",
"type": "Progressing"
}
],
"observedGeneration": 1,
"readyReplicas": 1,
"replicas": 1,
"updatedReplicas": 1
},
"ReconcileStatus": {
"Conditions": [
{
"lastTransitionTime": "2023-11-23T09:26:13Z",
"message": "Apply manifest complete",
"reason": "AppliedManifestComplete",
"status": "True",
"type": "Applied"
},
{
"lastTransitionTime": "2023-11-23T09:26:13Z",
"message": "Resource is available",
"reason": "ResourceAvailable",
"status": "True",
"type": "Available"
},
{
"lastTransitionTime": "2023-11-23T09:26:13Z",
"message": "",
"reason": "StatusFeedbackSynced",
"status": "True",
"type": "StatusFeedbackSynced"
}
],
"ObservedVersion": 1,
"SequenceID": "1744926882802962432"
}
},
"updated_at": "2023-11-23T09:26:13.457419Z",
"version": 1
}
],
"kind": "",
"page": 1,
"size": 1,
"total": 1
}
Take OpenShift Local as an example to deploy the maestro. If you want to deploy maestro in an OpenShift cluster, you need to set the external_apps_domain
environment variable to point your cluster.
$ export external_apps_domain=`oc -n openshift-ingress-operator get ingresscontroller default -o jsonpath='{.status.domain}'`
Use OpenShift Local to deploy to a local openshift cluster. Be sure to have CRC running locally:
$ crc status
CRC VM: Running
OpenShift: Running (v4.13.12)
RAM Usage: 7.709GB of 30.79GB
Disk Usage: 23.75GB of 32.68GB (Inside the CRC VM)
Cache Usage: 37.62GB
Cache Directory: /home/mturansk/.crc/cache
Log into CRC:
$ make crc/login
Logging into CRC
Logged into "https://api.crc.testing:6443" as "kubeadmin" using existing credentials.
You have access to 66 projects, the list has been suppressed. You can list all projects with 'oc projects'
Using project "ocm-mturansk".
Login Succeeded!
Deploy maestro:
We will push the image to your OpenShift cluster default registry and then deploy it to the cluster. You need to follow this document to expose a default registry manually and login into the registry with podman.
$ make deploy
$ oc get pod -n maestro-root
NAME READY STATUS RESTARTS AGE
maestro-85c847764-4xdt6 1/1 Running 0 62s
maestro-db-1-deploy 0/1 Completed 0 62s
maestro-db-1-kwv4h 1/1 Running 0 61s
maestro-mqtt-6cb7bdf46c-kcczm 1/1 Running 0 63s
Create a consumer:
$ ocm login --token=${OCM_ACCESS_TOKEN} --url=https://maestro.${external_apps_domain} --insecure
$ ocm post /api/maestro/v1/consumers << EOF
{
"name": "cluster1"
}
EOF
{
"created_at":"2023-12-08T11:35:08.557450505Z",
"href":"/api/maestro/v1/consumers/3f28c601-5028-47f4-9264-5cc43f2f27fb",
"id":"3f28c601-5028-47f4-9264-5cc43f2f27fb",
"kind":"Consumer",
"name":"cluster1",
"updated_at":"2023-12-08T11:35:08.557450505Z"
}
Deploy maestro agent:
$ export consumer_name=cluster1
$ make deploy-agent
$ oc get pod -n maestro-agent-root
NAME READY STATUS RESTARTS AGE
maestro-agent-5dc9f5b4bf-8jcvq 1/1 Running 0 13s
Create a resource:
$ ocm post /api/maestro/v1/resources << EOF
{
"consumer_name": "cluster1",
"version": 1,
"manifest": {
"apiVersion": "apps/v1",
"kind": "Deployment",
"metadata": {
"name": "nginx",
"namespace": "default"
},
"spec": {
"replicas": 1,
"selector": {
"matchLabels": {
"app": "nginx"
}
},
"template": {
"metadata": {
"labels": {
"app": "nginx"
}
},
"spec": {
"containers": [
{
"image": "nginxinc/nginx-unprivileged",
"name": "nginx"
}
]
}
}
}
}
}
EOF
You should be able to see the pod is created in default namespace.
$ oc get pod -n default
NAME READY STATUS RESTARTS AGE
nginx-5d6b548959-829c7 1/1 Running 0 70s
- Add to openapi.yaml
- Generate the new structs/clients (
make generate
)