Applies to SUSE Linux Enterprise Server 15 SP3, Rancher Kubernetes Engine Government 1.20.14

5 Deployment #

This section describes the process steps for the deployment of the Rancher Kubernetes Engine Government solution. It describes the process steps to deploy each of the component layers starting as a base functional proof-of-concept, having considerations on migration toward production, providing scaling guidance that is needed to create the solution.

5.1 Deployment overview #

The deployment stack is represented in the following figure:

Figure 5.1: Deployment Stack - Rancher Kubernetes Engine Government #

and details are covered for each layer in the following sections.

Note

The following section’s content is ordered and described from the bottom layer up to the top.

5.2 Compute Platform #

The base, starting configuration can reside all within a single HP ZCentral 4R. Based upon the relatively small resource requirements for a Rancher Kubernetes Engine Government deployment, a viable approach is to deploy as a virtual machine (VM) on the target nodes, on top of an existing hypervisor, like Kernel-bsed Virtual Machine (KVM). Another option is to use one or more HP ZCentral 4R baremetal systems for the deployments. For the physical host, there are tools that can be used during the setup of the server, as detailed below.

Preparation(s)

When the system is obtained, connect the network cables and a display monitor, keyboard and mouse to interact with the HP ZCentral 4R.

Deployment Process

On the respective compute module node

Given the simplicity of the deployment, the operating system can
- be installed with the respective SUSE operating system media ISO media,
- be converted to a USB drive, or
- leverage Preboot Execution Environment (PXE) infrastructure.
For deployments targeting virtual machines, determine if a hypervisor is already available or provisioned.
- If this will be the first use of this node, an option is to deploy a KVM hypervisor, based upon SUSE Linux Enterprise Server by following the Virtualization Guide.
- Then for the solution VM node, use the hypervisor user interface to allocate the necessary CPU, memory, disk and networking as noted in the SUSE Rancher hardware requirements.

Deployment Consideration(s)

To further optimize system resources, leverage the following practice(s):

Performance
- If a Graphics Processing Unit (GPU) is present in the HP ZCentral 4R, include deployment of the respective device driver at the operating system level and potentially obtain any available respective container runtime libraries for cloud-native workloads to access this resource.

5.3 SUSE Linux Enterprise Server #

As the base software layer, use an enterprise-grade Linux operating system. For example, SUSE Linux Enterprise Server.

Preparation(s)

To meet the solution stack prerequisites and requirements, SUSE operating system offerings, like SUSE Linux Enterprise Server can be used.

Ensure these services are in place and configured for this node to use:
- Domain Name Service (DNS) - an external network-accessible service to map IP Addresses to host names
- Network Time Protocol (NTP) - an external network-accessible service to obtain and synchronize system times to aid in time stamp consistency
- Software Update Service - access to a network-based repository for software update packages. This can be accessed directly from each node via registration to
  - the general, internet-based SUSE Customer Center (SCC) or
  - an organization’s SUSE Manager infrastructure or
  - a local server running an instance of Repository Mirroring Tool (RMT)
    Note
    During the node’s installation, it can be pointed to the respective update service. This can also be accomplished post-installation with the command line tool named SUSEConnect.

Deployment Process

On the compute platform node, install the noted SUSE operating system, by following these steps:

Download the SUSE Linux Enterprise Server product (either for the ISO or Virtual Machine image)
- Identify the appropriate, supported version of SUSE Linux Enterprise Server by reviewing the support matrix for SUSE Rancher versions Web page.
The installation process is described and can be performed with default values by following steps from the product documentation, see Installation Quick Start
Tip
Adjust both the password and the local network addressing setup to comply with local environment guidelines and requirements.

Deployment Consideration(s)

To further optimize deployment factors, leverage the following practices:

Automation
- To reduce user intervention, unattended deployments of SUSE Linux Enterprise Server can be automated
  - for ISO-based installations, by referring to the AutoYaST Guide

5.4 Rancher Kubernetes Engine Government #

Preparation(s)

Identify the appropriate, desired version of the Rancher Kubernetes Engine Government (for example vX.YY.ZZ+rke2rV) by reviewing
- the "Supported Rancher Kubernetes Engine Government Versions" associated with the respective SUSE Rancher version from "Rancher Kubernetes Engine Government Downstream Clusters" section, or
- the "Releases" on the Download Web page.
For Rancher Kubernetes Engine Government versions 1.21 and higher, if the host kernel supports AppArmor, the AppArmor tools (usually available via the "apparmor-parser" package) must also be present prior to installing Rancher Kubernetes Engine Government.
- On the SUSE Linux Enterprise Server node, install this required package
```
zypper install apparmor-parser
```
For the underlying operating system firewall service, either
- enable and configure the necessary inbound ports or
- stop and completely disable the firewall service.

Deployment Process

Perform the following steps to install the first Rancher Kubernetes Engine Government server on one of the nodes to be used for the Kubernetes control plane

Set the following variable with the noted version of Rancher Kubernetes Engine Government, as found during the preparation steps.
```
RKE2_VERSION=""
```
Install the appropriate version of Rancher Kubernetes Engine Government:
- Download the installer script:
```
curl -sfL https://get.rke2.io | \
	INSTALL_RKE2_VERSION=${RKE2_VERSION} sh -
```
- Set the following variable with the URL that will be used to access the SUSE Rancher server. This may be based on one or more DNS entries, a reverse-proxy server, or a load balancer:
```
RKE2_subjectAltName=
```
- Create the RKE2 config.yaml file:
```
mkdir -p /etc/rancher/rke2/
cat <<EOF> /etc/rancher/rke2/config.yaml
write-kubeconfig-mode: "0644"
tls-san:
  - "${RKE2_subjectAltName}"
EOF
```
Start and enable the RKE2 service, which will begin installing the required Kubernetes components:
```
systemctl enable --now rke2-server.service
```
- Include the Rancher Kubernetes Engine Government binary directories in this user’s path:
```
echo "PATH=${PATH}:/opt/rke2/bin:/var/lib/rancher/rke2/bin/" >> ~/.bashrc
source  ~/.bashrc
```
- Monitor the progress of the installation:
```
export KUBECONFIG=/etc/rancher/rke2/rke2.yaml
watch -c "kubectl get deployments -A"
```
  Note
  For the first two to three minutes of the installation, the initial output will include the error phrase "The connection to the server 127.0.0.1:6443 was refused - did you specify the right host or port?". As Kubernetes services get started this will be replace with "No resources found". About four minutes after beginning the installation, the output will begin showing the deployments being created, and after six to seven minutes the installation should be complete.
  - The Rancher Kubernetes Engine Government deployment is complete when elements of all the deployments (coredns, ingress, and metrics-server) show at least "1" as "AVAILABLE"
    Use Ctrl+c to exit the watch loop after all deployment pods are running

Deployment Consideration(s)

To further optimize deployment factors, leverage the following practices:

Availability
- A full high-availability Rancher Kubernetes Engine Government cluster is recommended for production workloads. The etcd key/value store (aka database) requires an odd number of servers (aka master nodes) be allocated to the Rancher Kubernetes Engine Government cluster. In this case, two additional control-plane servers should be added; for a total of three.
  1. Deploy the same operating system on the new compute platform nodes
  2. Log in to the first server node and create a new config.yaml file for the remaining two server nodes:
    Set the following variables, as appropriate for this cluster
    # Private IP preferred, if available FIRST_SERVER_IP="" # Private IP preferred, if available SECOND_SERVER_IP="" # Private IP preferred, if available THIRD_SERVER_IP="" # From the /var/lib/rancher/rke2/server/node-token file on the first server NODE_TOKEN="" # Match the first of the first server (Hint: `kubectl get nodes`) RKE2_VERSION=""
    Create the new config.yaml file:
    echo "server: https://${FIRST_SERVER_IP}:9345" > config.yaml echo "token: ${NODE_TOKEN}" >> config.yaml cat /etc/rancher/rke2/config.yaml >> config.yaml
    Tip
    The next steps require using SCP and SSH. Setting up passwordless SSH, and/or using ssh-agent, from the first server node to the second and third nodes will make these steps quicker and easier.
    Copy the new config.yaml file to the remaining two server nodes:
    scp config.yaml ${SECOND_SERVER_IP}:~/ scp config.yaml ${THIRD_SERVER_IP}:~/
    Move the config.yaml file to the correct location in the file system:
    ssh ${SECOND_SERVER_IP} << EOF mkdir -p /etc/rancher/rke2/ cp ~/config.yaml /etc/rancher/rke2/config.yaml cat /etc/rancher/rke2/config.yaml EOF ssh ${THIRD_SERVER_IP} << EOF mkdir -p /etc/rancher/rke2/ cp ~/config.yaml /etc/rancher/rke2/config.yaml cat /etc/rancher/rke2/config.yaml EOF
    Execute the following sets of commands on each of the remaining control-plane nodes:
    Install Rancher Kubernetes Engine Government
    ssh ${SECOND_SERVER_IP} << EOF curl -sfL https://get.rke2.io | \ INSTALL_RKE2_VERSION=${RKE2_VERSION} sh - systemctl enable --now rke2-server.service EOF ssh ${THIRD_SERVER_IP} << EOF curl -sfL https://get.rke2.io | \ INSTALL_RKE2_VERSION=${RKE2_VERSION} sh - systemctl enable --now rke2-server.service EOF
    Monitor the progress of the new server nodes joining the Rancher Kubernetes Engine Government cluster: watch -c "kubectl get nodes"
    It takes up to eight minutes for each node to join the cluster
    A node has deployed correctly when its status is "Ready" and it holds the roles of "control-plane,etcd,master"
    Use Ctrl+c to exit the watch loop after all deployment pods are running
    Note
    This can be changed to the normal Kubernetes default by adding a taint to each server node. See the official Kubernetes documentation for more information on how to do that.
  3. (Optional) In cases where agent nodes are desired, execute the following sets of commands, using the same, "RKE2_VERSION", "FIRST_SERVER_IP" and "NODE_TOKEN" variable settings as above, on each of the agent nodes to add it to the Rancher Kubernetes Engine Government cluster:
    curl -sfL https://get.rke2.io | \ INSTALL_RKE2_VERSION=${RKE2_VERSION} \ RKE2_URL=https://${FIRST_SERVER_IP}:6443 \ RKE2_TOKEN=${NODE_TOKEN} \ RKE2_KUBECONFIG_MODE="644" \ sh -

After this successful deployment of the Rancher Kubernetes Engine Government solution, review the product documentation for details on how to directly use this Kubernetes cluster. Furthermore, by reviewing the SUSE Rancher product documentation this solution can also be:

imported (refer to sub-section "Importing Existing Clusters"), then
managed (refer to sub-section "Cluster Administration") and
accessed (refer to sub-section "Cluster Access") to address orchestration of workloads, maintaining security and many more functions are readily available.