Running a local cluster network operator for plugin development

Creating a Custom Image

Create an image repository

You need somewhere to store your custom image that the AWS cluster instance can pull it from. The easiest options are Docker Hub or Quay.io. Create an account. Now create a repository called "ovn-kubernetes".

The typical development cni images are for ovn-kubernetes and sdn. ovn upstream is at [email protected]:ovn-org/ovn-kubernetes.git. Downstream is [email protected]:openshift/ovn-kubernetes.git The installer includes images built in downstream. sdn is [email protected]:openshift/sdn

Creating a Custom ovn-kubernetes Image

Clone ovn-kubernetes

1. git clone [email protected]:ovn-org/ovn-kubernetes.git
2. make your changes to the source tree
3. cd ovn-kubernetes/go-controller
4. make

Build and push the custom ovn-kubernetes image

Assuming you are working with the upstream ovn-kubernetes git repo and using Docker Hub, you can build an image from your ovn-kubernetes changes using the following steps:

1. cd dist/images/
2. make fedora
3. docker tag ovn-kube-f:latest docker.io/(docker hub username)/ovn-kubernetes:latest
4. docker push docker.io/(docker hub username)/ovn-kubernetes:latest

Using Downstream/OpenShift ovn-kubernetes with podman

1. Create your combined pull secrets as described below
2. Make your changes to your local openshift/ovn-kubernetes repo
3. Push your changes to a new PR
4. Click the 'details' link on the prow/images CI job in your PR
5. Refresh until the build log appears, and look for the line Tagged shared images from ocp/4.4:${component}, images will be pullable from registry.svc.ci.openshift.org/XXXXXXX/stable:${component}
6. Run sudo podman pull --authfile /path/to/combined-pull-secrets registry.svc.ci.openshift.org/XXXXXXX/stable:ovn-kubernetes substituting the right ci-op-xxxx namespace from step 5.
7. Push the image to dockerhub with sudo podman push

Using Downstream/OpenShift ovn-kubernetes with docker

1. Create your combined pull secrets as described below
2. Make your changes to your local openshift/ovn-kubernetes repo
3. Push your changes to a new PR
4. Click the 'details' link on the prow/images CI job in your PR
5. Refresh until the build log appears, and look for the line Tagged shared images from ocp/4.4:${component}, images will be pullable from registry.svc.ci.openshift.org/XXXXXXX/stable:${component}
6. Run oc registry login
7. Run docker login --username $(oc whoami) --password $(oc whoami -t) registry.svc.ci.openshift.org
8. Run docker pull registry.svc.ci.openshift.org/XXXXXXX/stable:ovn-kubernetes substituting the right ci-op-xxxx namespace from step 5.
9. Push the image to dockerhub with docker push

Download the OpenShift Installer

The installer handles cluster creation in AWS, gcp, Azure and more.

1. Go to https://amd64.ocp.releases.ci.openshift.org/ and find an installer in the "4.6" stream that is shown in green (eg, has passed CI).

The selected installer includes installer and client images for Linux and Mac. Always grab both an installer and the related client tools. You will frequently need to upgrade the installer and tools so put them in a convenient directory and add the directory to your $PATH (in ~/.baserc).

The nightly installers are built with the official OCP images and the ci builds are built with the images that are used in ci testing. Aside from the cluster-network-operator which we will be building and testing, all the images are part of the chosen installer. So if you need a specific image you need an installer that has it.

2. Click the "Download the installer" link at the top of the page
3. Wait a while
4. Click the link for the "openshift-install-linux" tarball (eg "openshift-install-linux-4.2.0-0.ci-2019-06-25-135202.tar.gz") to download it
5. Extract the tarball somewhere for later, like /tmp

Get your Pull Secrets

Pull Secrets are specific to your user and allow your cluster to download the container images for all the OpenShift components. There are two pull secrets to get: the internal-only OpenShift CI ones (used by some installer bootstrap images) and the general OpenShift Developer secrets. The pull-secrets do change periodically. It's best to make sure you have the latest pull-secrets before attempting to spawn the cluster if it's been a few days since you got your pull-secrets updated.

Get the Generic OpenShift pull secrets

The generic pull secrets are the same for all clusters. The "AWS" choice is a good as any other.

1. Go to the OpenShift Hybrid Cloud Console
2. Click on Create Cluster
3. Click on AWS
4. Click the Installer Provisioned Infrastructure box
5. Click the "Download Pull Secret" box and save the pull secret to /tmp/pull-secret

Get the OpenShift CI pull secret

1. go to the registry.ci server
2. login by clicking the "Github" button
3. click "Display Token"
4. copy the oc login ... command into a terminal and execute it
5. Run oc registry login --to=/tmp/pull-secret to dump the pull secret to the same file as before Your CI pull secret is also now in /tmp/pull-secret combined with the generic OpenShift pull secrets that we'll feed to the installer.

Using the combined pull secret

Once we've combined the pull secret file you can pass them to the installer when it asks for them. simply by copying the output of jq -c < /tmp/pull-secret

Clone and build the Cluster Network Operator

1. git clone [email protected]:openshift/cluster-network-operator.git
2. cd cluster-network-operator
3. hack/build-go.sh

Whenever you make changes in the Cluster Network Operator you must hack/build-go.sh to include the changes in testing.

Get an AWS account

https://mojo.redhat.com/docs/DOC-1081313#jive_content_id_Amazon_AWS

Get a GCE account

https://mojo.redhat.com/docs/DOC-1081313#jive_content_id_GCE The Service Account is required the first time you create a GCP cluster. It is cached for subsequent use.

Run hack/run-locally.sh to start a cluster with your custom image

The first time you run the installer it will ask a series of questions. One of the questions is the cluster host. When it is done there will be an 'install-config.yaml.bak.XXXXXX' file in the cluster temporary directory that you give to hack/run-locally.sh. You can copy this 'install-config.yaml.bak.XXXXX' file and pass it to hack/run-locally.sh to save steps next time.

The installer puts its work files in a supplied directory (which it will create if not present). Otherwise, it puts them in the current directory.

The default cni plugin is sdn. The -n option can be used to select ovn.

3. Run hack/run-locally.sh -c (cluster temp dir) -n ovn -m docker.io/(docker hub username)/ovn-kubernetes:latest and substitute as necessary.
4. hack/run-locally.sh runs the openshift-installer for you, so now you get to answer some questions
5. SSH Public Key - this allows you to SSH to the bootstrap node for debugging; pick one.
6. Platform - pick AWS or gcp
7. Region - pick something close to you (the default selection tends to get oversubscribed)
8. Base Domain - pick devcluster.openshift.com
9. Cluster Name - pick something unique like "dcbw-ovntest". (It should start with your redhat username).
10. Pull Secret - Paste the contents of /tmp/combined-pull-secrets that we created earlier
11. Your install-config.yaml.bak.XXXXX file will now be in your (cluster temp dir). Copy this file somewhere for future use.

It is convenient to put the kubeconfig into the KUBECONFIG environment variable. This eliminates the need for the --config option. export KUBECONFIG=/(cluster temp dir)/auth/kubeconfig

Poking around your cluster

1. You can tail -f /(cluster temp dir)/.openshift-install.log to watch progress. After it says "
2. List pods: oc get pods --all-namespaces and look for ovn-kubernetes related pods. You should see them running.
3. Get logs from ovn-kubernetes: /path/to/oc --config /(cluster temp dir)/auth/kubeconfig logs -n openshift-ovn-kubernetes (ovn-kubernetes pod name) and it will yell at you to pick a container. Pick one and repeat the previous command but add -c (container name) to the end to get the logs.

AWS cluster: You can SSH to the bootstrap node if things don't seem to be coming up after a while. Look in /(cluster temp dir)/terraform.tfstate for the aws_instance type with the name "bootstrap". About 20 lines below you'll see "public_ip"; copy that IP and ssh -i /path/to/openshift-dev.pem core@(public IP). You get openshift-dev.pem from the shared secrets repository. Then journalctl -b -f -u bootkube.service and take a look at the errors.

GCP cluster: You can SSH to the bootstrap node if things don't seem to be coming up after a while. Look in /(cluster temp dir)/terraform.tfstate for the first "access_config": a few lines below is "nat_ip": "35.221.35.206" which is the public IP address of the bootstrap node. ssh -i ~/.ssh/\(rsa key)/ core@(public IP)

On the bootstrap node, oc get nodes -o wide shows the internal IP of the nodes. Copy the rsa key you selected in the cluster create into ~/.ssh

From the bootstrap node you can ssh into the master nodes ssh -i \(rsa key)\ core@\(internal node ip)\

Destroying your cluster

1. Ctrl+C hack/run-locally.sh
2. Run /path/to/openshift-install --dir (cluster temp dir) destroy cluster
3. Wait a long time

Subsequent cluster starts

Since you cached the install-config you can save yourself a lot of time. Now all you need to do is:

1. Run PATH=/path/to/oc:$PATH hack/run-locally.sh -c (cluster temp dir) -i /path/to/openshift-install -n ovn -m docker.io/(docker hub username)/ovn-kubernetes:latest -f /path/to/install-config.yaml and substitute as necessary.