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ocp-open5gs

Manifests and data examples to deploy open5gs in Red Hat OpenShift.

Rationale

This repo contains an example deployment of open5gs in Red Hat OpenShift container platform. More info of this opensource 5GC can be found at open5gs

Quickstart

  1. Deploy mongodb community operator. A mongodb cluster with three replicas that will act as backend for the open5gs core network. Currently, we use a privileged service account to mount as root some persistent volumes via nfs in mongodb-agents.

    deploy-mongodb

  2. Deploy certificates for open5gs components requiring diameter authentication. The HSS, MME, PCRF and the SMF are the entities requiring a certifacate that use diameter AAA protocol. The command below deploys cert-manager operator to ultimately generate the required secrets for the HSS, MME, PCRF, and SMF. A service account necessary to associate to all the subsequent deployments is also created.

    deploy-certificates

  3. Deploy sriov network node policy and networks for the 4G/5G core interfaces using sriov network operator.

    kustomize build sriov | oc apply -f -

  4. Deploy open5gs components.

    deploy-open5gs

  5. Uninstall open5gs components. Note that this does not uninstall mongodb operator.

    destroy-open5gs

  6. Destroy sriov network policy and sriov networks

    kustomize build assets/sriov | oc delete -f -

  7. Uninstall mongodb operator and database replicas. The command below will uninstall mongodb community operator and mongo DBs. The command below needs to be executed after the open5gs components have been uninstalled with the command in previou step.

    destroy-mongodb

  8. Delete ns

oc delete ns mongodb
oc delete ns open5gs-core

Deployment Strategy

SRIOV Networks

  • One SRIOV Network Node policy in Intel SRIOV-capable XXV710 NIC.

  • Five SRIOV networks are created (N2, N3, N6, S1U and S1C).

Component Configuration

  • All microservices running in one node

  • We use Kustomize configMapGenerator to generate ConfigMap from files for each Open5gs component. The configmaps generated will be consumed by each of the deployment associated to every open5gs component (i.e., Config Data--->Kustomize-->Configmaps). The example below generated the configmap for the SGWU component:

     kustomize build config/sgwu | oc apply -f -

  • The data stored in the configmaps populates Volume objects for every open5gs component to deploy. Every open5gs component will create one pod composed by one container.

  • Dependencies amongst the different open5gs components are currently handled on a synchronous wait (i.e., using wait --for=condition).

    • The configmap for the SMF requires of the IP allocated to the UPF.

  • UPF routing for uplink and downlink is initialized at UPF pod startup by the script configmap wraprouting, which is injected as a volume in UPF deployment.

Certificates and Diameter

As some of the services composing open5gs require diameter protocol authentication, the deployment needs to self-generate some certificates. In particular HSS, MME, PCRF, and SMF are using certificates. The certificates are gathered as secrets and mounted during deployment in /etc/tls. These certificates are deployed using the cert manager. To check that the certificates are present run kubectl get certificate and expect a very similar output as the one below:

NAME   READY   SECRET   AGE
hss    True    hss      30m
mme    True    mme      30m
pcrf   True    pcrf     30m
smf    True    smf      30m

MongoDB operator

The HSS and UDM are using as backend mongodb to store subscriber information. We use mongoDB-operator to deploy three replicas sets of mongodb (since we are deploying three workers). Before deploying open5gs components to check that the mongodb operator has been deployed run oc get mongodbcommunity and expect a very similar ouput as the one below:

NAME              PHASE     VERSION
open5gs-mongodb   Running

Open5Gs components

We use the same base image for all open5gs components. At deployment time we inject different .yamlconfiguration files to each open5gs microservice by means of configmap. Also we use a config map to mount diameter configuration for the hss, smf, mme, and pcrf. After running the deployment of open5gs we recomment to check that all pods are running eventually. Expect a very similar output as the one below after running oc get pods:

NAME                                          READY   STATUS    RESTARTS   AGE
amf-d5975b77b-nndh6                           1/1     Running   3          41m
ausf-799db46f87-nzthd                         1/1     Running   3          41m
bsf-6b8cf6cb55-787tg                          1/1     Running   3          41m
hss-6cd4d9b7b6-znsmf                          1/1     Running   0          41m
mme-79cbb9d965-qdmzs                          1/1     Running   4          41m
mongodb-kubernetes-operator-957dff59d-tgpgr   1/1     Running   0          82m
nrf-776d87bb5d-2vj7p                          1/1     Running   0          41m
nssf-67c5f6df78-x4lv5                         1/1     Running   3          41m
open5gs-mongodb-0                             2/2     Running   0          82m
pcf-7d749b98bf-884d5                          1/1     Running   3          41m
pcrf-5dffd6c689-kmhdf                         1/1     Running   4          41m
sgwc-74c9f94664-s64jt                         1/1     Running   3          41m
sgwu-694ddffd-tkkzp                           1/1     Running   0          41m
smf-76f648f58-f96f7                           1/1     Running   3          41m
udm-7549c55f5b-hc889                          1/1     Running   3          41m
udr-f748b7465-hk8bv                           1/1     Running   3          41m
upf-75fcf5dc7-g6vkc                           1/1     Running   0          41m
webui-d7797f598-b48jb                         1/1     Running   0          41m

Open5GS external services

Webui

The webui pod running inside the kubernetes cluster is used to register subscriber information that is stored in mongo db. To expose this service externally we can use a NodePort.

oc get svc webui-svc
NAME        TYPE       CLUSTER-IP     EXTERNAL-IP   PORT(S)          AGE
webui-svc   NodePort   10.96.59.136   <none>        3000:30030/TCP   2m

The service is accessible in worker nodes in port 30030. You should be able to access the web service in your localhost at port 3000, e.g., curl IP_WORKER:30030.

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Contributors

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