Add a machine¶
After you create a new OpenStack-based Mirantis Container Cloud managed cluster as described in Create a managed cluster, proceed with adding machines to this cluster using the Container Cloud web UI.
You can also use the instruction below to scale up an existing managed cluster.
To add a machine to an OpenStack-based managed cluster:
Log in to the Container Cloud web UI with the
Switch to the required project using the Switch Project action icon located on top of the main left-side navigation panel.
In the Clusters tab, click the required cluster name. The cluster page with Machines list opens.
On the cluster page, click Create Machine.
Fill out the form with the following parameters as required:
Create Machines Pool
Available since Container Cloud 2.17.0. Select to create a set of machines with the same provider spec to manage them as a single unit. Enter the machine pool name in the Pool Name field.
Specify the number of machines to create. If you create a machine pool, specify the replicas count of the pool.
Select Manager or Worker to create a Kubernetes manager or worker node.
The required minimum number of machines:
3 manager nodes for HA.
2 worker nodes for the Container Cloud workloads. If the multiserver mode is enabled for StackLight, add 3 worker nodes.
A cluster can have more than 3 manager machines, but only an odd number. In an even-sized cluster, an additional machine remains in the
Pendingstate until an extra manager machine is added. An even number of manager machines does not provide additional fault tolerance but increases the number of node required for etcd quorum.
From the drop-down list, select the required hardware configuration for the machine. The list of available flavors corresponds to the one in your OpenStack environment.
For the hardware requirements, see Requirements for an OpenStack-based cluster.
From the drop-down list, select the required cloud image:
If you do not have the required image in the list, add it to your OpenStack environment using the Horizon web UI by downloading it from:
A Container Cloud cluster based on both Ubuntu and CentOS operating systems is not supported.
From the drop-down list, select the availability zone from which the new machine will be launched.
Optional. Select Configure Server Metadata and add the required number of string key-value pairs for the machine
Prohibited keys are:
namespaceas they are used by Container Cloud.
Select the required node labels for the worker machine to run certain components on a specific node. For example, for the StackLight nodes that run Elasticsearch 0 and require more resources than a standard node, select the StackLight label. The list of available node labels is obtained from your current
Due to the known issue 23002, a custom value for a predefined node label cannot be set using the Container Cloud web UI. For a workaround, refer to the issue description.
If you deploy StackLight in the HA mode (recommended):
Add the StackLight label to minimum three worker nodes. Otherwise, StackLight will not be deployed until the required number of worker nodes is configured with the StackLight label.
Removal of the StackLight label from worker nodes along with removal of worker nodes with StackLight label can cause the StackLight components to become inaccessible. It is important to correctly maintain the worker nodes where the StackLight local volumes were provisioned. For details, see Delete a cluster machine.
To obtain the list of nodes where StackLight is deployed, refer to Upgrade managed clusters with StackLight deployed in HA mode.
You can add node labels after deploying a worker machine. On the Machines page, click the More action icon in the last column of the required machine field and select Configure machine.
Repeat the steps above for the remaining machines.
Monitor the deploy or update live status of the machine:
- Quick status
On the Clusters page, in the Managers or Workers columns. The green status icon indicates that the machine is Ready, the orange status icon indicates that the machine is Updating.
- Detailed status
In the Machines section of a particular cluster page, in the Status column. Hover over a particular machine status icon to verify the deploy or update status of a specific machine component.
You can monitor the status of the following machine components:
Readiness of a node in a Kubernetes cluster
Health and readiness of a node in a Docker Swarm cluster
LCM readiness status of a node
Readiness of a node in the underlying infrastructure (virtual or bare metal, depending on the provider type)
The machine creation starts with the Provision status. During provisioning, the machine is not expected to be accessible since its infrastructure (VM, network, and so on) is being created.
Other machine statuses are the same as the LCMMachine object states described in LCM controller.
Once the status changes to Ready, the deployment of the managed cluster components on this machine is complete.
Verify the status of the cluster nodes as described in Connect to a Mirantis Container Cloud cluster.
An operational managed cluster must contain a minimum of 3 Kubernetes manager nodes and 2 Kubernetes worker nodes. The deployment of the cluster does not start until the minimum number of nodes is created.
A machine with the manager node role is automatically deleted during the cluster deletion.
Before Container Cloud 2.17.0, to meet the etcd quorum and prevent the deployment failure, deletion of the manager nodes was prohibited.