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update Readme and fix couple of spilling errors
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Signed-off-by: Mohamed Mahmoud <mmahmoud@redhat.com>
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msherif1234 committed Jun 3, 2024
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192 changes: 189 additions & 3 deletions README.md
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# bpfman-operator

This repository currently contains a copy of the operator code which is part of
the [core bpfman mono-repo](https://github.com/bpfman/bpfman). To get started
please see the [bpfman documentation](https://bpfman.io/main).
The `bpfman-operator` repository exists in order to deploy and manage bpfman within a Kubernetes cluster.
This operator was built utilizing some great tooling provided by the
[operator-sdk library](https://sdk.operatorframework.io/).
A great first step in understanding some of the functionality can be to just run `make help`.


[![license](https://img.shields.io/github/license/bpfman/bpfman-operator.svg?maxAge=2592000)](https://github.com/bpfman/bpfman-operator/blob/main/LICENSE)
[![Project maturity: alpha](https://img.shields.io/badge/maturity-alpha-orange.svg)]()
[![Go report card](https://goreportcard.com/badge/github.com/bpfman/bpfman-operator)](https://goreportcard.com/report/github.com/bpfman/bpfman-operator)

## Deploy bpfman Operator

The `bpfman-operator` is running as a Deployment with a ReplicaSet of one.
It runs on the control plane and is composed of the containers `bpfman-operator` and
`kube-rbac-proxy`.
The operator is responsible for launching the bpfman Daemonset, which runs on every node.
The bpfman Daemonset is composed of the containers `bpfman`, `bpfman-agent`, and `node-driver-registrar`.

### Deploy Locally via KIND

After reviewing the possible make targets it's quick and easy to get `bpfman` deployed locally on your system
via a [KIND cluster](https://kind.sigs.k8s.io/), run:

```bash
make run-on-kind
```

> **NOTE:** By default, bpfman-operator deploys bpfman with CSI enabled.
CSI requires Kubernetes v1.26 due to a PR
([kubernetes/kubernetes#112597](https://github.com/kubernetes/kubernetes/pull/112597))
that addresses a gRPC Protocol Error that was seen in the CSI client code and it doesn't appear to have
been backported.
It is recommended to install kind v0.20.0 or later.

### Deploy To Openshift Cluster

First deploy the operator with one of the following two options:

#### 1. Manually with Kustomize

To manually install with Kustomize and raw manifests, execute the following
commands.
The Openshift cluster needs to be up and running and specified in `~/.kube/config`
file.

```bash
make deploy-openshift
```

To clean up at a later time, run:

```bash
make undeploy-openshift
```

#### 2. Via the OLM bundle

The other option for installing the `bpfman-operator` is through the
[OLM bundle](https://www.redhat.com/en/blog/deploying-operators-olm-bundles).

First create the namespace:

```bash
oc create ns openshift-bpfman
```

Then use `operator-sdk` to install the bundle like so:

```bash
operator-sdk run bundle quay.io/bpfman/bpfman-operator-bundle:latest --namespace openshift-bpfman
```

To clean up at a later time, execute:

```bash
operator-sdk cleanup bpfman-operator
```

followed by

```bash
oc delete ns openshift-bpfman
```

## Verify the Installation

Regardless of the deployment method, if the `bpfman-operator` was deployed successfully,
you will see the `bpfman-daemon` and `bpfman-operator` pods running without errors:

```bash
kubectl get pods -n bpfman
NAME READY STATUS RESTARTS AGE
bpfman-daemon-w24pr 3/3 Running 0 130m
bpfman-operator-78cf9c44c6-rv7f2 2/2 Running 0 132m
```

## Deploy an eBPF Program to the cluster

To test the deployment simply deploy one of the sample `xdpPrograms`:

```bash
kubectl apply -f config/samples/bpfman.io_v1alpha1_xdp_pass_xdpprogram.yaml
```

If loading of the XDP Program to the selected nodes was successful it will be reported
back to the user via the `xdpProgram`'s status field:

```bash
kubectl get xdpprogram xdp-pass-all-nodes -o yaml
apiVersion: bpfman.io/v1alpha1
kind: XdpProgram
metadata:
annotations:
kubectl.kubernetes.io/last-applied-configuration: |
{"apiVersion":"bpfman.io/v1alpha1","kind":"XdpProgram","metadata":{"annotations":{},"labels":{"app.kubernetes.io/name":"xdpprogram"},"name":"xdp-pass-all-nodes"},"spec":{"bpffunctionname":"pass","bytecode":{"image":{"url":"quay.io/bpfman-bytecode/xdp_pass:latest"}},"globaldata":{"GLOBAL_u32":[13,12,11,10],"GLOBAL_u8":[1]},"interfaceselector":{"primarynodeinterface":true},"nodeselector":{},"priority":0}}
creationTimestamp: "2023-11-07T19:16:39Z"
finalizers:
- bpfman.io.operator/finalizer
generation: 2
labels:
app.kubernetes.io/name: xdpprogram
name: xdp-pass-all-nodes
resourceVersion: "157187"
uid: 21c71a61-4e73-44eb-9b49-07af2866d25b
spec:
bpffunctionname: pass
bytecode:
image:
imagepullpolicy: IfNotPresent
url: quay.io/bpfman-bytecode/xdp_pass:latest
globaldata:
GLOBAL_u8: AQ==
GLOBAL_u32: DQwLCg==
interfaceselector:
primarynodeinterface: true
mapownerselector: {}
nodeselector: {}
priority: 0
proceedon:
- pass
- dispatcher_return
status:
conditions:
- lastTransitionTime: "2023-11-07T19:16:42Z"
message: bpfProgramReconciliation Succeeded on all nodes
reason: ReconcileSuccess
status: "True"
type: ReconcileSuccess
```

To view information in listing form simply run:

```bash
kubectl get xdpprogram -o wide
NAME BPFFUNCTIONNAME NODESELECTOR PRIORITY INTERFACESELECTOR PROCEEDON
xdp-pass-all-nodes pass {} 0 {"primarynodeinterface":true} ["pass","dispatcher_return"]
```

## API Types Overview

Refer to [api-spec.md](./api-spec.md) for a detailed description of all the bpfman Kubernetes API types.

### Multiple Program CRDs

The multiple `*Program` CRDs are the bpfman Kubernetes API objects most relevant to users.
They express how and where eBPF programs are to be deployed within a Kubernetes cluster. Currently,
bpfman supports:

* `fentryProgram`
* `fexitProgram`
* `kprobeProgram`
* `tcProgram`
* `tracepointProgram`
* `uprobeProgram`
* `xdpProgram`

## BpfProgram CRD

The `BpfProgram` CRD is used internally by the `bpfman-deployment` to keep track of per-node `bpfman` state,
such as map pin points, and to report node specific errors back to the user.
Kubernetes users/controllers are only allowed to view these objects, NOT create or edit them.

Applications wishing to use `bpfman` to deploy/manage their eBPF programs in Kubernetes will make use of this
object to find references to the bpfMap pinpoints (`spec.maps`) in order to configure their eBPF programs.

## Developer

For more architecture details about `bpfman-operator`, refer to
[Developing the bpfman-operator](https://bpfman.io/v0.4.1/developer-guide/develop-operator)
4 changes: 2 additions & 2 deletions apis/v1alpha1/shared_types.go
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Expand Up @@ -143,7 +143,7 @@ const (
// yet been loaded on all nodes in the cluster.
ProgramNotYetLoaded ProgramConditionType = "NotYetLoaded"

// ProgramReconcileError indicates that an unforseen situation has
// ProgramReconcileError indicates that an unforeseen situation has
// occurred in the controller logic, and the controller will retry.
ProgramReconcileError ProgramConditionType = "ReconcileError"

Expand Down Expand Up @@ -257,7 +257,7 @@ const (
// eBPF program and that program is not loaded.
BpfProgCondMapOwnerNotLoaded BpfProgramConditionType = "MapOwnerNotLoaded"

// BpfProgCondByteCodeError indicates that an error occured when trying to
// BpfProgCondBytecodeSelectorError indicates that an error occurred when trying to
// process the bytecode selector.
BpfProgCondBytecodeSelectorError BpfProgramConditionType = "BytecodeSelectorError"

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2 changes: 1 addition & 1 deletion controllers/bpfman-agent/common.go
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Expand Up @@ -255,7 +255,7 @@ func (r *ReconcilerCommon) reconcileBpfProgram(ctx context.Context,
}
}

// The BPF program was sucessfully reconciled.
// The BPF program was successfully reconciled.
return r.reconcileBpfProgramSuccessCondition(
isLoaded,
shouldBeLoaded,
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