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~/kube-cluster/hosts will be your inventory file and you’ve added two Ansible groups ( masters and workers) to it specifying the logical structure of your cluster. You may recall that inventory files in Ansible are used to specify server information such as IP addresses, remote users, and groupings of servers to target as a single unit for executing commands. Worker2 ansible_host= worker_2_ip ansible_user=rootĪnsible_python_interpreter=/usr/bin/python3
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Worker1 ansible_host= worker_1_ip ansible_user=root Master ansible_host= master_ip ansible_user=root It will also be the directory inside which you will run all local commands.Ĭreate a file named ~/kube-cluster/hosts using nano or your favorite text editor: nano ~/kube-cluster/hostsĪdd the following text to the file, which will specify information about the logical structure of your cluster: This directory will be your workspace for the rest of the tutorial and will contain all of your Ansible playbooks. The other two servers will be workers and will have the IPs worker_1_ip and worker_2_ip.Ĭreate a directory named ~/kube-cluster in the home directory of your local machine and cd into it: mkdir ~/kube-cluster Out of your three servers, one will be the master with an IP displayed as master_ip. Once that’s done, you will create a hosts file containing inventory information such as the IP addresses of your servers and the groups that each server belongs to. You will configure Ansible locally so that it can communicate with and execute commands on your remote servers. In this section, you will create a directory on your local machine that will serve as your workspace. Step 1 - Setting Up the Workspace Directory and Ansible Inventory File
Ansible playbooks kubeadm centos 7 how to#
Knowledge of how to launch a container from a Docker image.For review, check out Configuration Management 101: Writing Ansible Playbooks. For installation instructions on other platforms like macOS or CentOS, follow the official Ansible installation documentation.
Ansible playbooks kubeadm centos 7 install#
If you’re running Ubuntu 18.04 as your OS, follow the “Step 1 – Installing Ansible” section in How to Install and Configure Ansible on Ubuntu 18.04to install Ansible.
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containerized applications and services) will run. Worker nodes are the servers where your workloads (i.e. It runs Etcd, which stores cluster data among components that schedule workloads to worker nodes. The master node (a node in Kubernetes refers to a server) is responsible for managing the state of the cluster. Your cluster will include the following physical resources: