Infoblox Kubernetes1.0.0 IPAM Plugin
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1 2h DEPLOYMENT GUIDE Infoblox Kubernetes1.0.0 IPAM Plugin NIOS version 8.X August Infoblox Inc. All rights reserved. Infoblox Kubernetes IPAM Deployment Guide August 2018 Page 1 of 18
2 Overview... 3 Introduction... 3 Kubernetes... 3 Docker... 3 Infoblox IPAM plugin for Kubernetes... 3 Use Cases... 3 Automatic IP Address Assignment... 3 Deployment... 4 Docker Installation... 5 Cleaning up Older Versions... 5 Setting up the Docker Repository... 6 Verify Installation... 7 Kubernetes installation... 7 Setting up the kubernetes repository... 7 Configure cgroup driver used by kubelet... 8 Reload and restart the Kubelet daemon... 8 Run the following commands ONLY on master node... 8 Commands to be executed on Nodes (Node1 and Node2)... 9 Downloading and Installing Infoblox plugin Checking Infoblox IPAM plugin configuration files and binary in the Nodes Creating Pods Grid View of Infoblox IPAM plugin for Kubernetes Getting the Pod information from the Cloud View Deleting the Pods Infoblox Inc. All rights reserved. Infoblox Kubernetes IPAM Deployment Guide August 2018 Page 2 of 18
3 Overview Introduction Kubernetes Kubernetes is an open source platform that automates container (Docker and Rocket) operations. It eliminates many of the manual processes involved in deploying and scaling containerized applications. In other words, you can cluster together groups of hosts (called nodes) running containers, and Kubernetes helps you easily and efficiently manage those clusters. These clusters can span hosts across public, private, or hybrid clouds. Containers provide a different take on virtualization. In traditional virtualization, an entire computer platform is virtualized, including its operating system/kernel. With containers, the operating system becomes a shared resource and only the software deployed in the container is isolated. This consolidates system resources, providing a more efficient, streamlined and lightweight infrastructure. Docker Docker is a tool designed to make it easier to create, deploy, and run applications by using containers. Containers allow a developer to package up an application with all the parts it needs, such as libraries and other dependencies, and ship it all out as one package. By doing so, thanks to the container, the developer can rest assured that the application will run on any other Linux machine regardless of any customized settings that machine might have that could differ from the machine used for writing and testing the code. Infoblox IPAM plugin for Kubernetes The Infoblox IPAM plugin for Kubernetes is a managed plugin that interfaces with Infoblox to provide IP Address Management services for Infoblox managed Pods. The Infoblox IPAM plugin for Kubernetes is open source and can be downloaded from GitHub. This deployment guide will walk you through the steps of installing, using Kubernetes and the Infoblox IPAM plugin. Use Cases Automatic IP Address Assignment As containers become more prevalent across an organization, the ability to assign IP addresses that are routable and that follow the organization s policies becomes more critical. If an organization is using a spreadsheet and/or manual processes for IP address assignment across the organization, the dynamic and agile container world will quickly break the traditional manual IP address assignment processes. In addition, when containers are destroyed, the IP addresses should be documented and released but most IT teams do not focus on reclamation and clean up. The Infoblox IPAM Adapter for Kubernetes provides the pre-built and tested interaction to support IP address automation in container environments. Instead of manually allocating IP addresses, Infoblox automatically assigns IP addresses with flexible configuration options with separate or combined address space per host or hub. This automation reduces deployment times and eliminates the risk of overlapping and conflicting IP addresses. Reporting views track current and historical data for improved visibility Infoblox Inc. All rights reserved. Infoblox Kubernetes IPAM Deployment Guide August 2018 Page 3 of 18
4 Deployment This guide assumes that Kubernetes will be installed on 3 machines One Master and 2 Nodes. All the machines are running Ubuntu Server OS. All the machines are part of same subnet with Internet access. Please make sure that machines have corresponding host name entry in /etc/hosts file. /etc/hosts file for the Master node /etc/hosts file for the Node01 node 2018 Infoblox Inc. All rights reserved. Infoblox Kubernetes IPAM Deployment Guide August 2018 Page 4 of 18
5 /etc/hosts file for the Node02 node Docker Installation Docker is supported on multiple platforms and the installation steps will vary depending on the platform you are installing it on. Installation instructions can be found through the download page for the version of Docker that you will be using. There may also be multiple methods that can be used to complete the installation, including the use of repositories, an RPM package, or with automated convenience scripts. In this guide, we demonstrate the installation of the version of Docker CE on Ubuntu using repositories, a commonly used installation method. Additional instruction details can be found at Cleaning up Older Versions Run following commands on all 3 machines. Before beginning the installation of Docker, it is recommended to remove any older versions and their associated dependencies. To do this, type the following command: sudo apt-get remove docker docker-engine docker.io If no older versions have been previously installed, you may see output such as the following: 2018 Infoblox Inc. All rights reserved. Infoblox Kubernetes IPAM Deployment Guide August 2018 Page 5 of 18
6 apt-get remove docker docker-engine docker.io [sudo] password for infoblox: Reading package lists... Done Building dependency tree Reading state information... Done Package 'docker-engine' is not installed, so not removed Package 'docker' is not installed, so not removed Package 'docker.io' is not installed, so not removed 0 upgraded, 0 newly installed, 0 to remove and 45 not upgraded. Proceed to the next step once complete. Setting up the Docker Repository When installing Docker for the first time, you will first need to setup the Docker repository (a one-time step). After the repository has been configured, the installation and any upgrades are done from the repository. To setup the Docker repository: 1. Update the apt-get package index using: apt-get update 2. Install the curl utility using apt-get install curl 3. Install https related packages required to enable connectivity to the repository over https: apt-get install \ apt-transport-https \ ca-certificates \ software-properties-common Note: Copy and paste each line at a time in step 3. Don t copy and paste all of them at once as you will run into a problem executing the command. 4. Add the official GPG key for Docker: curl -fssl sudo apt-key add - 5. Run the following command to confirm that the key was successfully added. sudo add-apt-repository "deb [arch=amd64] $(lsb_release -cs) stable" 6. Install the docker container engine apt-get update && apt-get install -y docker-ce=$(apt-cache madison docker-ce grep head -1 awk '{print $3}') 2018 Infoblox Inc. All rights reserved. Infoblox Kubernetes IPAM Deployment Guide August 2018 Page 6 of 18
7 Verify Installation The Docker daemon starts automatically once the installation completes successfully. To verify that Docker has been successfully installed and is running, run the command docker --version : This will display the current version of docker. root@master:~# docker --version Docker version ce, build f5ec1e2 Kubernetes installation Run following commands on all 3 machines Setting up the kubernetes repository Use the following commands to set up the kubernetes repository and to install kubernetes. You can copy the commands shown in the box and directly paste in the command line. 1. sudo swapoff -a 2. apt-get update && apt-get install -y apt-transport-https curl 3. curl -s apt-key add - 4. cat <<EOF >/etc/apt/sources.list.d/kubernetes.list deb kubernetes-xenial main EOF Note: Copy and paste each line at a time in step 4. Don t copy and paste all of them at once as you will run into a problem executing the command. 5. apt-get update 6. apt-get install -y kubelet= kubeadm= kubectl= sudo swapoff -a apt-get update && apt-get install -y apt-transport-https curl curl -s \ apt-key add cat <<EOF >/etc/apt/sources.list.d/kubernetes.list deb kubernetes-xenial main EOF apt-get update apt-get install -y kubelet= kubeadm= kubectl= Infoblox Inc. All rights reserved. Infoblox Kubernetes IPAM Deployment Guide August 2018 Page 7 of 18
8 Configure cgroup driver used by kubelet Navigate to the /etc/systemd/system/kubelet.service.d/ directory to edit 10-kubeadm.conf file and add the following parameter --cgroup-driver=cgroupfs in Environment section. Sample Output: Reload and restart the Kubelet daemon 1. systemctl daemon-reload 2. systemctl restart kubelet systemctl daemon-reload systemctl restart kubelet Run the following commands ONLY on master node 1. swapoff -a 2. kubeadm init Note: This command will take some time to execute and will generate an output like this: Please make a note of the command highlighted in the red box. We will run this command on all nodes (Node1 and Node2) to join them to the master. 3. mkdir -p $HOME/.kube 4. sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config 5. sudo chown $(id -u):$(id -g) $HOME/.kube/config 6. export KUBECONFIG=/etc/kubernetes/admin.conf 2018 Infoblox Inc. All rights reserved. Infoblox Kubernetes IPAM Deployment Guide August 2018 Page 8 of 18
9 swapoff -a kubeadm init mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config export KUBECONFIG=/etc/kubernetes/admin.conf Commands to be executed on Nodes (Node1 and Node2) On the NODES, run the command which we obtained from step 2 in the previous section. kubeadm join : token bltz2g.2kc3wj1rza0yfm2v --discoverytoken-ca-cert-hash sha256:fb5886f96e278a4c97434b2dc a8e81b6ea805658bd301f7a92ef1e7f kubeadm join master_ip_address: token token --discovery-token-ca-certhash sha256:generated_sha_thumbprint Note: Please replace the values in Red with your environment specific details. Sample Output: Verifying Nodes Status To verify that the nodes are registered in the master, please run the following command in the master VM kubectl get nodes 2018 Infoblox Inc. All rights reserved. Infoblox Kubernetes IPAM Deployment Guide August 2018 Page 9 of 18
10 Sample Output: Note : Sometimes STATUS shows as Not Ready. It is a known issue and can be safely ignored. Downloading and Installing Infoblox plugin Login to the master and run the following commands 1. git clone git clone This command will create a cni-infoblox folder and will download the Infoblox Kubernetes plugin files to it. cd to this folder. Sample Output: 2. Change directory to k8s 2018 Infoblox Inc. All rights reserved. Infoblox Kubernetes IPAM Deployment Guide August 2018 Page 10 of 18
11 k8s folder has Infoblox IPAM plugin related files. We will modify some of these files to integrate Infoblox grid with the Kubernetes. 3. Edit the cni-infoblox-daemon.yaml file (nano cni-infoblox-daemon.yaml) and update the Infoblox Grid IP under args section 4. Edit the cni-infoblox-plugin.yaml file and update the master interface name under data section. Also update your container network subnet which you are planning to deploy. You can also define the network view name under network-view section. We will leave it as cni_view Infoblox Inc. All rights reserved. Infoblox Kubernetes IPAM Deployment Guide August 2018 Page 11 of 18
12 a. Interface name can be obtained by running ip a command 5. To create the cni-infoblox-daemon run the following command under cni-infoblox/k8s directory kubectl create -f cni-infoblox-daemon.yaml 6. Verify the creation of Infoblox daemon by running following command kubectl get pods --all-namespaces -o wide 7. Install the Infoblox IPAM plugin by running the following command under cni-infoblox/k8s directory kubectl create -f cni-infoblox-plugin.yaml 8. Verify the creation of Infoblox plugin pod by running following command kubectl get pods --all-namespaces -o wide 2018 Infoblox Inc. All rights reserved. Infoblox Kubernetes IPAM Deployment Guide August 2018 Page 12 of 18
13 Checking Infoblox IPAM plugin configuration files and binary in the Nodes By design, it is not required to install the Infoblox IPAM plugin on each of the nodes saperately. Master itself pushes the Infoblox IPAM plugin configuration files and binaries to the Nodes. Perform these actions on all the nodes 1. Login to the first node and navigate to the /etc/cni/net.d directory. 2. You will see 2 files in /etc/cni/net.d directory. Open the infoblox-ipam.conf file and verify the contents. Subnet details and network-view should be identical to the master VM. 3. To check the binary navigate to the /opt/cni/bin directory 2018 Infoblox Inc. All rights reserved. Infoblox Kubernetes IPAM Deployment Guide August 2018 Page 13 of 18
14 You will see the infoblox binary present in the /op/cni/bin directory Repeat this on the other node as well. Creating Pods 1. Navigate to the cni-infoblox directory which we created in master node under Downloading and Installing Infoblox plugin section. You will see an example directory. Navigate to this directory using cd command. 2. Create a pod by running following command kubectl create -f test-app.yml 3. Verify that the container creation process has started by running following command kubectl get pods 2018 Infoblox Inc. All rights reserved. Infoblox Kubernetes IPAM Deployment Guide August 2018 Page 14 of 18
15 Grid View of Infoblox IPAM plugin for Kubernetes 1. Login to the Grid and navigate to the Data Management tab. You should see a network view created as cni_view 2. Navigate to cni_view network view > IPAM. You should see a /24 network created Infoblox Inc. All rights reserved. Infoblox Kubernetes IPAM Deployment Guide August 2018 Page 15 of 18
16 3. Navigate to the /24 network and click on list view. You should see 2 IP addresses assigned to the pods which we created under Creating Pods section. 4. Login to the master VM and run the following command to get the pod details kubectl get pods -o wide 5. Verify that the name of the Pods and IP addresses match the values in the Infoblox Grid cni_view >IPAM >List Getting the Pod information from the Cloud View 1. Login to the Grid and navigate to the Cloud tab Tenants. Here you will get information about the Kubernetes cluster. Under VM tab you can find out number of active pods Infoblox Inc. All rights reserved. Infoblox Kubernetes IPAM Deployment Guide August 2018 Page 16 of 18
17 2. Now click on VM tab to get detailed information about the kubernetes pods. Here we see 4 active pods. We created first 2 pods by running the test-app.yml file. Last 2 pods got created when we ran cni-infoblox-daemon.yaml file and cni-infoblox-plgin.yaml file as described under Downloading and Installing Infoblox section. Infoblox plugin runs as a containerized application in these 2 pods. Deleting the Pods 1. Login to the master and run the following command under cni-infoblox/example directory to delete the pods. kubectl delete -f test-app.yml 2018 Infoblox Inc. All rights reserved. Infoblox Kubernetes IPAM Deployment Guide August 2018 Page 17 of 18
18 2. Login to the Infoblox Grid and navigate to Data Management > cni_view > IPAM > List. Verify that all the pods are deleted Infoblox Inc. All rights reserved. Infoblox Kubernetes IPAM Deployment Guide August 2018 Page 18 of 18
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