Installing Rancher. As we have the docker installed in the system,We can install Rancher as a docker container on the Ubuntu Host. Sudo docker run -d -restart=unless-stopped -p 8080:8080 rancher/server. The above command will download the latest version of rancher docker image to the Ubuntu host machine. Aug 18, 2019 the install is finished. Setup Rancher HA with Helm and Cert Manager. In this step we will install Rancher with certificates managed by Let’s encrypt. First we need to install the cert-manager with: $ helm install stable/cert-manager -name cert-manager -namespace kube-system -version v0.5.2. We can check the install status with. Installing Rancher. As we have the docker installed in the system,We can install Rancher as a docker container on the Ubuntu Host. Sudo docker run -d -restart=unless-stopped -p 8080:8080 rancher/server. The above command will download the latest version of rancher docker image to the Ubuntu host machine.
One of the attractive characteristics of Kubernetes is how it can run pretty much anywhere – in the cloud, in the data center, on the edge, on your local machine and much more. Leveraging existing investments in datacenter resources can be logical when deciding where to place new Kubernetes clusters, and this post goes into automating this with Rancher and Terraform.
For this exercise the following is leveraged:
- Rancher 2.3
- vSphere 6.7
- Ubuntu 18.04 LTS
An Ubuntu VM will be created and configured into a template to spin up Kubernetes nodes.
Step 1 – Preparing a Ubuntu Server VM
In Rancher 2.3 Node templates for vSphere can leverage either of the following:
For the purposes of this demo,
'Deploy from template' will be used, given its simplicity.
To create a new VM template, we must first create a VM. Right-click an appropriate object in vCenter and select
'New Virtual Machine'
Select a source:
Give it a name:
Give it a home (compute):
Give it a home (storage):
Specify the VM hardware version:
Specify the guest OS:
15:11youtube.comDocker, Rancher, Kubernetes... Minecraft? (Rancher Setup And Install Tutorial)
Configure the VM properties, ensure the Ubuntu install CD is mounted:
After this, power up the VM and walk through the install steps. After which it can be turned into a template:
Rancher doesn’t have much in the way of requirements for the VM. For this install method a VM needs to have:
- Cloud-Init (Installed by default on Ubuntu 18.04).
- SSH connectivity (Rancher will provide its own SSH certificates as per Cloud-Init bootstrap) – Ensure SSH server has been installed.
A Note on Cloud-Init
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For Vanilla Ubuntu Server installs, it uses Cloud-Init as part of the general Installation process. As such, cloud-init can not be re-invoked on startup by default. To get around this for templating purposes, the VM must be void of the existing cloud-init configuration prior to being turned into a template. To accomplish this, run the following:
Before shutting down the VM and converting it into a template.
Constructing the Terraform Script
Rancher.com › Docs › RancherInstalling Rancher Server
Now the VM template has been created it can be leveraged by a Terraform script:
Specify the provider: (Note –
insecure = 'true' Is required for vCenter servers leveraging an untrusted certificate, such as self-signed.
Specify the Cloud Credentials:
Specify the Node Template settings:
Note we can supply extra cloud-config options to further customise the VM, including adding additional SSH keys for users.
Specify the cluster settings:
Specify the Node Pool:
After which the script can be executed.
What’s going on?
Install Rancher Ubuntu 18.04
From a high level the following activities are being executed:
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- Rancher requests VM’s from vSphere using supplied Cloud Credentials.
- vSphere clones the VM Templateeverywhere with the specified configuration parameters.
- An ISO image is mounted to the VM, which contains certificates and configuration generated by Rancher in the cloud-init format.
- Cloud-Init on startup reads this ISO image and applies the configuration.
- Rancher builds the Kubernetes cluster by Installing Docker and pulling down the images.
5:58youtube.comHow To Install Rancher To Manage A Kubernetes Cluster Docker Container
After which, a shiny new cluster will be created!