Contiv-VPP Vagrant Installation¶
Prerequisites¶
The following items are prerequisites before installing vagrant:
Vagrant 2.0.1 or later
Hypervisors:
VirtualBox 5.2.8 or later
VMWare Fusion 10.1.0 or later or VmWare Workstation 14
For VmWare Fusion, you will need the Vagrant VmWare Fusion plugin
Laptop or server with at least 4 CPU cores and 16 Gig of RAM
Creating / Shutting Down / Destroying the Cluster¶
This folder contains the Vagrant file that is used to create a single or multi-node Kubernetes cluster using Contiv-VPP as a Network Plugin.
The folder is organized into two subfolders:
(config) - contains the files that share cluster information, which are used during the provisioning stage (master IP address, Certificates, hash-keys). CAUTION: Editing is not recommended!
(vagrant) - contains scripts that are used for creating, destroying, rebooting and shutting down the VMs that host the K8s cluster.
To create and run a K8s cluster with a contiv-vpp CNI plugin, run the
vagrant-start script, located in the vagrant folder. The vagrant-start
script prompts the user to select the number of worker nodes for the kubernetes cluster.
Zero (0) worker nodes mean that a single-node cluster (with one kubernetes master node) will be deployed.
Next, the user is prompted to select either the production environment or the development environment. Instructions on how to build the development contiv/vpp-vswitch image can be found below in the development environment command section.
The last option asks the user to select either Without StealTheNIC or With StealTheNIC. Using option With StealTheNIC has the plugin “steal” interfaces owned by Linux and uses their configuration in VPP.
For the production environment, enter the following commands:
| => ./vagrant-start
Please provide the number of workers for the Kubernetes cluster (0-50) or enter [Q/q] to exit: 1
Please choose Kubernetes environment:
1) Production
2) Development
3) Quit
--> 1
You chose Development environment
Please choose deployment scenario:
1) Without StealTheNIC
2) With StealTheNIC
3) Quit
--> 1
You chose deployment without StealTheNIC
Creating a production environment, without STN and 1 worker node(s)
For the development environment, enter the following commands:
| => ./vagrant-start
Please provide the number of workers for the Kubernetes cluster (0-50) or enter [Q/q] to exit: 1
Please choose Kubernetes environment:
1) Production
2) Development
3) Quit
--> 2
You chose Development environment
Please choose deployment scenario:
1) Without StealTheNIC
2) With StealTheNIC
3) Quit
--> 1
You chose deployment without StealTheNIC
Creating a development environment, without STN and 1 worker node(s)
To destroy and clean-up the cluster, run the vagrant-cleanup script, located inside the vagrant folder:
cd vagrant/
./vagrant-cleanup
To shutdown the cluster, run the vagrant-shutdown script, located inside the vagrant folder:
cd vagrant/
./vagrant-shutdown
To reboot the cluster, run the vagrant-reload script, located inside the vagrant folder:
cd vagrant/
./vagrant-reload
From a suspended state, or after a reboot of the host machine, the cluster can be brought up by running the vagrant-up script.
Building and Deploying the dev-contiv-vswitch Image¶
If you chose the optional development-environment-deployment option, then perform the following instructions on how to build a modified contivvpp/vswitch image:
Make sure changes in the code have been saved. From the k8s-master node, build the new contivvpp/vswitch image (run as sudo):
vagrant ssh k8s-master
cd /vagrant/config
sudo ./save-dev-image
The newly built contivvpp/vswitch image is now tagged as latest. Verify the build with
sudo docker images; the contivvpp/vswitch should have been created a few seconds ago. The new image with all the changes must become available to all the nodes in the K8s cluster. To make the changes available to all, load the docker image into the running worker nodes (run as sudo):
vagrant ssh k8s-worker1
cd /vagrant/config
sudo ./load-dev-image
Verify with
sudo docker images; the old contivvpp/vswitch should now be tagged as<none>and the latest tagged contivvpp/vswitch should have been created a few seconds ago.
Exploring the Cluster¶
Once the cluster is up, perform the following steps:
Log into the master:
cd vagrant
vagrant ssh k8s-master
Welcome to Ubuntu 16.04 LTS (GNU/Linux 4.4.0-21-generic x86_64)
* Documentation: https://help.ubuntu.com/
vagrant@k8s-master:~$
Verify the Kubernetes/Contiv-VPP installation. First, verify the nodes in the cluster:
vagrant@k8s-master:~$ kubectl get nodes -o wide
NAME STATUS ROLES AGE VERSION EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
k8s-master Ready master 22m v1.9.2 <none> Ubuntu 16.04 LTS 4.4.0-21-generic docker://17.12.0-ce
k8s-worker1 Ready <none> 15m v1.9.2 <none> Ubuntu 16.04 LTS 4.4.0-21-generic docker://17.12.0-ce
Next, verify that all pods are running correctly:
vagrant@k8s-master:~$ kubectl get pods -n kube-system -o wide
NAME READY STATUS RESTARTS AGE IP NODE
contiv-etcd-2ngdc 1/1 Running 0 17m 192.169.1.10 k8s-master
contiv-ksr-x7gsq 1/1 Running 3 17m 192.169.1.10 k8s-master
contiv-vswitch-9bql6 2/2 Running 0 17m 192.169.1.10 k8s-master
contiv-vswitch-hpt2x 2/2 Running 0 10m 192.169.1.11 k8s-worker1
etcd-k8s-master 1/1 Running 0 16m 192.169.1.10 k8s-master
kube-apiserver-k8s-master 1/1 Running 0 16m 192.169.1.10 k8s-master
kube-controller-manager-k8s-master 1/1 Running 0 15m 192.169.1.10 k8s-master
kube-dns-6f4fd4bdf-62rv4 2/3 CrashLoopBackOff 14 17m 10.1.1.2 k8s-master
kube-proxy-bvr74 1/1 Running 0 10m 192.169.1.11 k8s-worker1
kube-proxy-v4fzq 1/1 Running 0 17m 192.169.1.10 k8s-master
kube-scheduler-k8s-master 1/1 Running 0 16m 192.169.1.10 k8s-master
If you want your pods to be scheduled on both the master and the workers, you have to untaint the master node:
Check VPP and its interfaces:
vagrant@k8s-master:~$ sudo vppctl
_______ _ _ _____ ___
__/ __/ _ \ (_)__ | | / / _ \/ _ \
_/ _// // / / / _ \ | |/ / ___/ ___/
/_/ /____(_)_/\___/ |___/_/ /_/
vpp# sh interface
Name Idx State Counter Count
GigabitEthernet0/8/0 1 up rx packets 14
rx bytes 3906
tx packets 18
tx bytes 2128
drops 3
ip4 13
...
Make sure that
GigabitEthernet0/8/0is listed and that its status isup.Next, create an example deployment of nginx pods:
vagrant@k8s-master:~$ kubectl run nginx --image=nginx --replicas=2
deployment "nginx" created
Check the status of the deployment:
vagrant@k8s-master:~$ kubectl get deploy -o wide
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR
nginx 2 2 2 2 2h nginx nginx run=nginx
Verify that the pods in the deployment are up and running:
vagrant@k8s-master:~$ kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE
nginx-8586cf59-6kx2m 1/1 Running 1 1h 10.1.2.3 k8s-worker1
nginx-8586cf59-j5vf9 1/1 Running 1 1h 10.1.2.2 k8s-worker1
Issue an HTTP GET request to a pod in the deployment:
vagrant@k8s-master:~$ wget 10.1.2.2
--2018-01-19 12:34:08-- http://10.1.2.2/
Connecting to 10.1.2.2:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 612 [text/html]
Saving to: ‘index.html.1’
index.html.1 100%[=========================================>] 612 --.-KB/s in 0s
2018-01-19 12:34:08 (1.78 MB/s) - ‘index.html.1’ saved [612/612]
How to SSH into k8s Worker Node¶
To SSH into k8s Worker Node, perform the following steps:
cd vagrant
vagrant status
vagrant ssh k8s-worker1