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What is OpenStack? What is Kubernetes? What is Docker?
In the OpenStack lab, the controller executes the function of partitioning resources. The compute nodes are the collection of resources (memory, CPUs, hard drive space) to be partitioned. When creating a VM with "X" memory, "Y" CPUs and "Z" hard drive space, OpenStack's controller reviews its pool of available resources, allocates the quota, and then creates the VM on one of the available compute nodes. Many VMs can be created on a single compute node. OpenStack's controller uses a lot of criteria to choose a compute node, but if an application spans multiple VMs, Affinity rules can be used to ensure the VMs don’t congregate on a single compute node. This would not be good for resilience.
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Deployment Architecture
The Kubernetes deployment in this tutorial will be set up on top of OpenStack VMs. Let's call this the undercloud. undercloud can be physical boxes, or VMs. The VMs can come from different cloud providers, but in this tutorial we will use OpenStack. The following table shows the layers of software that need to be considered when thinking about resilience:
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openstack server list; openstack network list; openstack flavor list; openstack keypair list; openstack image list; openstack security group list openstack server create --flavor "flavor-name" --image "ubuntu-16.04-server-cloudimg-amd64-disk1" --key-name "keypair-name" --nic net-id="net-name" --security-group "security-group-id" "k8s-master" openstack server create --flavor "flavor-name" --image "ubuntu-16.04-server-cloudimg-amd64-disk1" --key-name "keypair-name" --nic net-id="net-name" --security-group "security-group-id" "k8s-node1" openstack server create --flavor "flavor-name" --image "ubuntu-16.04-server-cloudimg-amd64-disk1" --key-name "keypair-name" --nic net-id="net-name" --security-group "security-group-id" "k8s-node2" openstack server create --flavor "flavor-name" --image "ubuntu-16.04-server-cloudimg-amd64-disk1" --key-name "keypair-name" --nic net-id="net-name" --security-group "security-group-id" "k8s-node3" |
Configure Each VM
Repeat the following steps on each VM:
Pre-Configure Each VM
Make sure the VMs are:
- Up to date
- The clocks are synchonized
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Question: Did you check date on all K8S nodes to make sure they are in synch?
Install Docker
The ONAP apps are pakages in Docker containers.
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sudo apt-get install linux-image-extra-$(uname -r) linux-image-extra-virtual
sudo apt-get install apt-transport-https ca-certificates curl software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo apt-key fingerprint 0EBFCD88
# Add a docker repository to "/etc/apt/sources.list". It is for the latest stable one for the ubuntu falvour on the machine ("lsb_release -cs")
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
sudo apt-get update
sudo apt-get -y install docker-ce
sudo docker run hello-world
# Verify:
sudo docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
c66d903a0b1f hello-world "/hello" 10 seconds ago Exited (0) 9 seconds ago vigorous_bhabha |
Install the Kubernetes Pakages
Just install the pakages; there is no need to configure them yet.
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Note: If you intend to remove kubernetes packages use "apt autoremove kubelet; apt autoremove kubeadm;apt autoremove kubectl;apt autoremove kubernetes-cni" .
Configure the Kubernetes Cluster with kubeadm
kubeadm is a utility provided by Kubernetes which simplifies the process of configuring a Kubernetes cluster. Details about how to use it can be found here: https://kubernetes.io/docs/setup/independent/create-cluster-kubeadm/.
Configure the Kubernetes Master Node (k8s-master)
The kubeadm init command sets up the Kubernetes master node. SSH to the k8s-master VM and invoke the following command. It is important to capture the output into a log file as there is information which you will need to refer to afterwards.
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sudo kubectl get pods --all-namespaces -o wide NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE kube-system etcd-k8s-master 1/1 Running 0 1m 10.147.112.140 k8s-master kube-system kube-apiserver-k8s-master 1/1 Running 0 1m 10.147.112.140 k8s-master kube-system kube-controller-manager-k8s-master 1/1 Running 0 1m 10.147.112.140 k8s-master kube-system kube-dns-545bc4bfd4-jcklm 3/3 Running 0 44m 10.32.0.2 k8s-master kube-system kube-proxy-lnv7r 1/1 Running 0 44m 10.147.112.140 k8s-master kube-system kube-scheduler-k8s-master 1/1 Running 0 1m 10.147.112.140 k8s-master kube-system weave-net-b2hkh 2/2 Running 0 1m 10.147.112.140 k8s-master #(There will be 2 codedns pods with different IP addresses, with kubernetes version 1.10.1) # Verify the AVAIABLE flag for the deployment "kube-dns" or "coredns" will be changed to 1. (2 with kubernetes version 1.10.1) sudo kubectl get deployment --all-namespaces NAMESPACE NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE kube-system kube-dns 1 1 1 1 1h |
Troubleshooting tip:
- If any of the weave pods face a problem and gets stuck at "ImagePullBackOff " state, you can try running the " sudo kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')" " again.
- Sometimes, you need to delete the problematic pod, to let it terminate and start fresh. Use "kubectl delete po/<pod-name> -n <name-space> " to delete a pod.
- To "Unjoin" a worker node "kubectl delete node <node-name> (go through the "Undeploy APPC" process at the end if you have an APPC cluster running)
Install "make" ( Learn more about ubuntu-make here : https://wiki.ubuntu.com/ubuntu-make)
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####################### # Install make from kubernetes directory. ####################### $ sudo apt install make Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: linux-headers-4.4.0-62 linux-headers-4.4.0-62-generic linux-image-4.4.0-62-generic snap-confine Use 'sudo apt autoremove' to remove them. Suggested packages: make-doc The following NEW packages will be installed: make 0 upgraded, 1 newly installed, 0 to remove and 72 not upgraded. Need to get 151 kB of archives. After this operation, 365 kB of additional disk space will be used. Get:1 http://nova.clouds.archive.ubuntu.com/ubuntu xenial/main amd64 make amd64 4.1-6 [151 kB] Fetched 151 kB in 0s (208 kB/s) Selecting previously unselected package make. (Reading database ... 121778 files and directories currently installed.) Preparing to unpack .../archives/make_4.1-6_amd64.deb ... Unpacking make (4.1-6) ... Processing triggers for man-db (2.7.5-1) ... Setting up make (4.1-6) ... |
Install Helm and Tiller on the Kubernetes Master Node (k8s-master)
ONAP uses Helm, a package manager for kubernetes.
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# Uninstalls Tiller from a cluster helm reset --force # Clean up any existing artifacts kubectl -n kube-system delete deployment tiller-deploy kubectl -n kube-system delete serviceaccount tiller kubectl -n kube-system delete ClusterRoleBinding tiller-clusterrolebinding kubectl create -f tiller-serviceaccount.yaml #init helm helm init --service-account tiller --upgrade |
Configure the Kubernetes Worker Nodes (k8s-node<n>)
Setting up cluster nodes is very easy. Just refer back to the "kubeadm init" output logs (/root/kubeadm_init.log). In the last line of the the logs, there is a “kubeadm join” command with token information and other parameters.
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Now you have a Kubernetes cluster with 3 worker nodes and 1 master node.
Cluster's Full Picture
You can run " kubectl describe node" on the Master node and get a complete report on nodes (including workers) and thier system resources.
Configure dockerdata-nfs
This is a shared directory which must be mounted on all of the Kuberenetes VMs(master node and worker nodes). Because many of the ONAP pods use this directory to share data.
See 3. Share the /dockerdata-nfs Folder between Kubernetes Nodes for instruction on how to set this up.
Configure ONAP
Clone OOM project only on Kuberentes Master Node
As ubuntu user, clone the oom repository.
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$ vi oom/kubernetes/onap/values.yaml Example: ... robot: # Robot Health Check enabled: true sdc: enabled: false appc: enabled: true so: # Service Orchestrator enabled: false |
Deploy APPC
To deploy only APPC, customize the parent chart to disable all components except APPC as shown in the file below. Also set the global.persistence.mountPath to some non-mounted directory (by default, it is set to mounted directory /dockerdata-nfs).
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ubuntu@k8s-master:~/oom/kubernetes$ kubectl get pods --all-namespaces -o wide -w NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE kube-system etcd-k8s-master 1/1 Running 5 14d 10.12.5.171 k8s-master kube-system kube-apiserver-k8s-master 1/1 Running 5 14d 10.12.5.171 k8s-master kube-system kube-controller-manager-k8s-master 1/1 Running 5 14d 10.12.5.171 k8s-master kube-system kube-dns-86f4d74b45-px44s 3/3 Running 21 27d 10.32.0.5 k8s-master kube-system kube-proxy-25tm5 1/1 Running 8 27d 10.12.5.171 k8s-master kube-system kube-proxy-6dt4z 1/1 Running 4 27d 10.12.5.174 k8s-node1 kube-system kube-proxy-jmv67 1/1 Running 4 27d 10.12.5.193 k8s-node2 kube-system kube-proxy-l8fks 1/1 Running 6 27d 10.12.5.194 k8s-node3 kube-system kube-scheduler-k8s-master 1/1 Running 5 14d 10.12.5.171 k8s-master kube-system tiller-deploy-84f4c8bb78-s6bq5 1/1 Running 0 4d 10.47.0.7 k8s-node2 kube-system weave-net-bz7wr 2/2 Running 20 27d 10.12.5.194 k8s-node3 kube-system weave-net-c2pxd 2/2 Running 13 27d 10.12.5.174 k8s-node1 kube-system weave-net-jw29c 2/2 Running 20 27d 10.12.5.171 k8s-master kube-system weave-net-kxxpl 2/2 Running 13 27d 10.12.5.193 k8s-node2 onap dev-appc-0 0/2 PodInitializing 0 2m 10.47.0.5 k8s-node2 onap dev-appc-1 0/2 PodInitializing 0 2m 10.36.0.8 k8s-node3 onap dev-appc-2 0/2 PodInitializing 0 2m 10.44.0.7 k8s-node1 onap dev-appc-cdt-8cbf9d4d9-mhp4b 1/1 Running 0 2m 10.47.0.1 k8s-node2 onap dev-appc-db-0 2/2 Running 0 2m 10.36.0.5 k8s-node3 onap dev-appc-dgbuilder-54766c5b87-xw6c6 0/1 PodInitializing 0 2m 10.44.0.2 k8s-node1 onap dev-robot-785b9bfb45-9s2rs 0/1 PodInitializing 0 2m 10.36.0.7 k8s-node3 |
Cleanup deployed ONAP instance
To delete a deployed instance, use the following command:
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#query existing pv in onap namespace $ kubectl get pv -n onap NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE dev-appc-data0 1Gi RWO Retain Bound onap/dev-appc-data-dev-appc-0 dev-appc-data 8m dev-appc-data1 1Gi RWO Retain Bound onap/dev-appc-data-dev-appc-2 dev-appc-data 8m dev-appc-data2 1Gi RWO Retain Bound onap/dev-appc-data-dev-appc-1 dev-appc-data 8m dev-appc-db-data 1Gi RWX Retain Bound onap/dev-appc-db-data dev-appc-db-data 8m #Example commands are found here: #delete existing pv $ kubectl delete pv dev-appc-data0 -n onap pv "dev-appc-data0" deleted $ kubectl delete pv dev-appc-data1 -n onap pv "dev-appc-data0" deleted $ kubectl delete pv dev-appc-data2 -n onap pv "dev-appc-data2" deleted $ kubectl delete pv dev-appc-db-data -n onap pv "dev-appc-db-data" deleted #query existing pvc in onap namespace $ kubectl get pvc -n onap NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE dev-appc-data-dev-appc-0 Bound dev-appc-data0 1Gi RWO dev-appc-data 9m dev-appc-data-dev-appc-1 Bound dev-appc-data2 1Gi RWO dev-appc-data 9m dev-appc-data-dev-appc-2 Bound dev-appc-data1 1Gi RWO dev-appc-data 9m dev-appc-db-data Bound dev-appc-db-data 1Gi RWX dev-appc-db-data 9m #delete existing pvc $ kubectl delete pvc dev-appc-data-dev-appc-0 -n onap pvc "dev-appc-data-dev-appc-0" deleted $ kubectl delete pvc dev-appc-data-dev-appc-1 -n onap pvc "dev-appc-data-dev-appc-1" deleted $ kubectl delete pvc dev-appc-data-dev-appc-2 -n onap pvc "dev-appc-data-dev-appc-2" deleted $ kubectl delete pvc dev-appc-db-data -n onap pvc "dev-appc-db-data" deleted |
Verify APPC Clustering
Refer to Validate the APPC ODL cluster.
Get the details from Kubernete Master Node
Access to RestConf UI is via https://<Kuberbetes-Master Node-IP>:30230/apidoc/explorer/index.html (admin user)
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