ib-kubernetes

README

• InfiniBand Kubernetes
  • Subnet Manager Plugins
  • Build
    • Building InfiniBand Kubernetes Binary
    • Building Subnet Manager Plugins
    • Building Container Image
  • Configuration Reference
  • Plugins
    • NOOP Plugin
    • UFM (Unified Fabric Manager) Plugin
  • Deployment

InfiniBand Kubernetes

InfiniBand Kubernetes provides a daemon ib-kubernetes, that works in conjuction with InfiniBand SR-IOV CNI and Multus CNI, it acts on kubernetes Pod object changes(Create/Update/Delete), reading the Pod's network annotation and fetching its corresponding network CRD and and reads the PKey, to add the newly generated Guid or the predefined Guid in guid field of CRD cni-args to that PKey, for pods with annotation mellanox.infiniband.app.

Note: InfiniBand Kubernetes supports x86 architecture.

Subnet Manager Plugins

InifiBand Kubernets uses Golang plugins to communicate with the fabric subnet manager Subnet manager plugins exists in pkg/sm/plugins. There are currently 2 plugins:

1. UFM Plugin
2. NOOP Plugin

Build

To build InfiniBand Kubernetes use the makefile.

Building InfiniBand Kubernetes Binary

To build only the binary for InfiniBand Kubernetes

$ make build

Upon successful build the binary will be available in build/ib-kubernetes.

Building Subnet Manager Plugins

To build all the plugins binaries for InfiniBand Kubernetes that exist in pkg/sm/plugins

Building all plugins

$ make plugins

Building a specific plugin

make <plugin name>-plugin

Example:

$ make ufm-plugin

Upon successful build the plugins binaries will be available in build/plugins/.

Note: to build all binaries at once run make.

Building Container Image

To build container image

Building image mellanox/ib-kubernetes

$ make image

Building image with custom tag and Dockerfile

$ DOCKERFILE=myfile TAG=mytag make image

Configuration Reference

IB Kubernetes configration as ConfigMap :

apiVersion: v1
kind: ConfigMap
metadata:
  name: ib-kubernetes-config
  namespace: kube-system
data:
  DAEMON_SM_PLUGIN: "ufm" # Name of the subnet manager plugin
  DAEMON_SM_PLUGIN_PATH: "/plugins" # Path to SM plugins folder
  DAEMON_PERIODIC_UPDATE: "5" # Interval in seconds to send add and remove request to subnet manager
  GUID_POOL_RANGE_START: "02:00:00:00:00:00:00:00" # The first guid in the pool
  GUID_POOL_RANGE_END: "02:FF:FF:FF:FF:FF:FF:FF" # The last guid in the pool

Note: For Infiniband workloads to work properly, multus CNI must be configured to work with kubernetes API by specifying the kubeconfig field in its configurations. If it is missing, then the Pod's infiniband network will not be properly set up.

Plugins

Subnet Manager Plugin to configure PKeys (Partition Keys) in the InfiniBand fabric.

NOOP Plugin

Plugin that does nothing. Example for developing user subnet manager plugin

UFM (Unified Fabric Manager) Plugin

UFM is a powerful platform for managing scale-out computing environments. UFM Plugin allow to configure PKeys (Partition Keys) via UFM.

Plugin Configuration

apiVersion: v1
kind: Secret
metadata:
  name: ib-kubernetes-ufm-secret
  namespace: kube-system
stringData:
  UFM_USERNAME: "admin"  # UFM Username
  UFM_PASSWORD: "123456" # UFM Password
  UFM_ADDRESS: ""        # UFM Hostname/IP Address 
  UFM_HTTP_SCHEMA: ""    # http/https. Default: https
  UFM_PORT: ""           # UFM REST API port. Defaults: 443(https), 80(http)
string:
  UFM_CERTIFICATE: ""    # UFM Certificate in base64 format. (if not provided client will not verify server's certificate chain and host name)

UFM CERTIFICATE

UFM utilizes certificates to authenticate requests, during deployment you should provide UFM with a valid certificate in your organization or create a self signed one.

Self Signed Certificates

Optional step if don't have a valid certificate for UFM.

Login to UFM

Containerized UFM:

$ docker exec -it ufm bash

Create private key and certificate

$ openssl req -x509 -newkey rsa:4096 -keyout ufm.key -out ufm.crt -days 365 -subj '/CN=<UFM hostname>'

Install UFM private key and certificate

Login to UFM

Containerized UFM:

$ docker exec -it ufm bash

Copy private and crtificate to UFM location

$ cp ufm.key /etc/pki/tls/private/ufmlocalhost.key
$ cp ufm.crt /etc/pki/tls/certs/ufmlocalhost.crt

Restart UFM

Containerized UFM:

$ docker restart ufm

Bare-metal UFM:

systemctl restart ufmd

Create UFM secret

$ kubectl create secret generic ib-kubernetes-ufm-secret --namespace="kube-system" --from-literal=UFM_USER="admin" --from-literal=UFM_PASSWORD="12345" --from-literal=UFM_ADDRESS="127.0.01" --from-file=UFM_CERTIFICATE=ufmlocalhost.crt --dry-run -o yaml > ib-kubernetes-ufm-secret.yaml
$ kubectl create -f ./ib-kubernetes-ufm-secret.yaml 

Deployment

To deploy the InfiniBand Kbubernetes

$ kubectl create -f deployment/ib-kubernetes-configmap.yaml
$ kubectl create -f deployment/ib-kubernetes-ufm-secret.yaml
$ kubectl create -f deployment/ib-kubernetes.yaml

Limitations

• Each node in an Infiniband Kubernetes deployment may be associated with up to 128 PKeys due to kernel limitation.