LAB Prometheus and Grafana on CentOS8
Sun 16.02.2020
Lab used for learning Prometheus, Grafana and CentOS8 in the same time. IaC provided through Terraform and Ansible on a vSphere 6.7 test infrastructure. Prometheus and Grafana will reside on the same VM. No HA (maybe in the next lab). Version control done with Git and GitHub.
Lab configuration
Prerequisites
-
a vSphere 6.7 test infrastructure
-
Terraform and Ansible installed on the control workstation
$ terraform -v Terraform v0.12.20 + provider.vsphere v1.16.1 $ ansible --version ansible 2.9.4 -
govcinstalled (optional) on the control workstation -
a CentOS8 template image to clone from, prepared for Ansible configuration management
| Hostname | IP | CPU | RAM | Storage |
|---|---|---|---|---|
| okila.hl.local | 192.168.7.95 | 2 | 4 GB | 50 GB thin |
CentOS8 is installed using UEFI boot and this is reflected in Terraform main.tf file as it needs firmware and efi_secure_boot_enabled parameters configured. The template used for cloning the VM is a minimal netinstall, which is already updated when the network installation is completed, but you have to install Perl on it otherwise the customization script on vSphere won't work. Perl isn't installed by default on a minimal install. Also the CentOS8 template is prepared to be configured by Ansible (it has a user with sudo rights and a key ssh-copy-id-ed as required).
All the variables are exposed in terraform.tfvars file except the username and password needed to access the vSphere infrastructure. These two variables are exported as environment variables from the file vsphere.env excluded in .gitignore for security reasons. Replace them with your own credentials.
$ cat vsphere.env
export TF_VAR_vsphere_user="user@domain.local"
export TF_VAR_vsphere_password="password"
Of course before running terraform commands the .env file must be sourced.