$ ssh-keygen -t rsa -b 4096 -N '' \ -f <path>/<file_name> (1)
In OpenShift Container Platform version 4.3, you can install a cluster into an existing Azure Virtual Network (VNet) on Microsoft Azure. The installation program provisions the rest of the required infrastructure, which you can further customize. To customize the installation, you modify parameters in the install-config.yaml
file before you install the cluster.
Review details about the OpenShift Container Platform installation and update processes.
Configure an Azure account to host the cluster and determine the tested and validated region to deploy the cluster to.
If you use a firewall, you must configure it to allow the sites that your cluster requires access to.
If you do not allow the system to manage identity and access management (IAM), then a cluster administrator can manually create and maintain IAM credentials. Manual mode can also be used in environments where the cloud IAM APIs are not reachable.
In OpenShift Container Platform 4.3, you can deploy a cluster into an existing Azure Virtual Network (VNet) in Microsoft Azure. If you do, you must also use existing subnets within the VNet and routing rules.
By deploying OpenShift Container Platform into an existing Azure VNet, you might be able to avoid service limit constraints in new accounts or more easily abide by the operational constraints that your company’s guidelines set. This is a good option to use if you cannot obtain the infrastructure creation permissions that are required to create the VNet.
The use of an existing VNet requires the use of the updated Azure Private DNS (preview) feature. See Announcing Preview Refresh for Azure DNS Private Zones for more information about the limitations of this feature. |
When you deploy a cluster by using an existing VNet, you must perform additional network configuration before you install the cluster. In installer-provisioned infrastructure clusters, the installer usually creates the following components, but it does not create them when you install into an existing VNet:
Subnets
Route tables
VNets
Network Security Groups
If you use a custom VNet, you must correctly configure it and its subnets for the installation program and the cluster to use. The installation program cannot subdivide network ranges for the cluster to use, set route tables for the subnets, or set VNet options like DHCP, so you must do so before you install the cluster.
The cluster must be able to access the resource group that contains the existing VNet and subnets. While all of the resources that the cluster creates are placed in a separate resource group that it creates, some network resources are used from a separate group. Some cluster Operators must be able to access resources in both resource groups. For example, the Machine API controller attaches NICS for the virtual machines that it creates to subnets from the networking resource group.
Your VNet must meet the following characteristics:
The VNet’s CIDR block must contain the Networking.MachineCIDR
range, which is the IP address pool for cluster machines.
The VNet and its subnets must belong to the same resource group, and the subnets must be configured to use Azure-assigned DHCP IP addresses instead of static IP addresses.
You must provide two subnets within your VNet, one for the control plane machines and one for the compute machines. Because Azure distributes machines in different availability zones within the region that you specify, your cluster will have high availability by default.
To ensure that the subnets that you provide are suitable, the installation program confirms the following data:
All the subnets that you specify exist.
You provide two private subnets for each availability zone.
The subnet CIDRs belong to the machine CIDR that you specified. Machines are not provisioned in availability zones that you do not provide private subnets for. If required, the installation program creates public load balancers that manage the control plane and worker nodes, and Azure allocates a public IP address to them.
If you destroy a cluster that uses an existing VNet, the VNet is not deleted.
The network security groups for the subnets that host the compute and control plane machines require specific access to ensure that the cluster communication is correct. You must create rules to allow access to the required cluster communication ports.
The network security group rules must be in place before you install the cluster. If you attempt to install a cluster without the required access, the installation program cannot reach the Azure APIs, and installation fails. |
Port | Description | Control plane | Compute |
---|---|---|---|
|
Allows HTTP traffic |
x |
|
|
Allows HTTPS traffic |
x |
|
|
Allows communication to the control plane machines. |
x |
x |
Starting with OpenShift Container Platform 4.3, you do not need all of the permissions that are required for an installation program-provisioned infrastructure cluster to deploy a cluster. This change mimics the division of permissions that you might have at your company: some individuals can create different resources in your clouds than others. For example, you might be able to create application-specific items, like instances, storage, and load balancers, but not networking-related components such as VNets, subnet, or ingress rules.
The Azure credentials that you use when you create your cluster do not need the networking permissions that are required to make VNets and core networking components within the VNet, such as subnets, routing tables, internet gateways, NAT, and VPN. You still need permission to make the application resources that the machines within the cluster require, such as ELBs, security groups, S3 buckets, and nodes.
In OpenShift Container Platform 4.3, you require access to the internet to install your cluster. The Telemetry service, which runs by default to provide metrics about cluster health and the success of updates, also requires internet access. If your cluster is connected to the internet, Telemetry runs automatically, and your cluster is registered to the Red Hat OpenShift Cluster Manager (OCM).
Once you confirm that your Red Hat OpenShift Cluster Manager inventory is correct, either maintained automatically by Telemetry or manually using OCM, use subscription watch to track your OpenShift Container Platform subscriptions at the account or multi-cluster level.
You must have internet access to:
Access the Red Hat OpenShift Cluster Manager page to download the installation program and perform subscription management. If the cluster has internet access and you do not disable Telemetry, that service automatically entitles your cluster.
Access Quay.io to obtain the packages that are required to install your cluster.
Obtain the packages that are required to perform cluster updates.
If your cluster cannot have direct internet access, you can perform a restricted network installation on some types of infrastructure that you provision. During that process, you download the content that is required and use it to populate a mirror registry with the packages that you need to install a cluster and generate the installation program. With some installation types, the environment that you install your cluster in will not require internet access. Before you update the cluster, you update the content of the mirror registry. |
If you want to perform installation debugging or disaster recovery on your cluster, you must provide an SSH key to both your ssh-agent
and to the installation program.
In a production environment, you require disaster recovery and debugging. |
You can use this key to SSH into the master nodes as the user core
. When you
deploy the cluster, the key is added to the core
user’s
~/.ssh/authorized_keys
list.
You must use a local key, not one that you configured with platform-specific approaches such as AWS key pairs. |
If you do not have an SSH key that is configured for password-less authentication on your computer, create one. For example, on a computer that uses a Linux operating system, run the following command:
$ ssh-keygen -t rsa -b 4096 -N '' \ -f <path>/<file_name> (1)
1 | Specify the path and file name, such as ~/.ssh/id_rsa , of the SSH key.
Do not specify an existing SSH key, as it will be overwritten. |
Running this command generates an SSH key that does not require a password in the location that you specified.
Start the ssh-agent
process as a background task:
$ eval "$(ssh-agent -s)" Agent pid 31874
Add your SSH private key to the ssh-agent
:
$ ssh-add <path>/<file_name> (1) Identity added: /home/<you>/<path>/<file_name> (<computer_name>)
1 | Specify the path and file name for your SSH private key, such as ~/.ssh/id_rsa |
When you install OpenShift Container Platform, provide the SSH public key to the installation program.
Before you install OpenShift Container Platform, download the installation file on a local computer.
You must install the cluster from a computer that uses Linux or macOS.
You need 500 MB of local disk space to download the installation program.
Access the Infrastructure Provider page on the Red Hat OpenShift Cluster Manager site. If you have a Red Hat account, log in with your credentials. If you do not, create an account.
Navigate to the page for your installation type, download the installation program for your operating system, and place the file in the directory where you will store the installation configuration files.
The installation program creates several files on the computer that you use to install your cluster. You must keep both the installation program and the files that the installation program creates after you finish installing the cluster. |
Deleting the files created by the installation program does not remove your cluster, even if the cluster failed during installation. You must complete the OpenShift Container Platform uninstallation procedures outlined for your specific cloud provider to remove your cluster entirely. |
Extract the installation program. For example, on a computer that uses a Linux operating system, run the following command:
$ tar xvf <installation_program>.tar.gz
From the
Pull Secret page on the Red Hat OpenShift Cluster Manager site, download your installation pull secret as a .txt
file. This pull secret allows you to authenticate with the services that
are provided by the included authorities, including Quay.io, which serves the
container images for OpenShift Container Platform components.
You can customize your installation of OpenShift Container Platform on Microsoft Azure.
Obtain the OpenShift Container Platform installation program and the pull secret for your cluster.
Create the install-config.yaml
file.
Run the following command:
$ ./openshift-install create install-config --dir=<installation_directory> (1)
1 | For <installation_directory> , specify the directory name to store the
files that the installation program creates. |
Specify an empty directory. Some installation assets, like bootstrap X.509 certificates have short expiration intervals, so you must not reuse an installation directory. If you want to reuse individual files from another cluster installation, you can copy them into your directory. However, the file names for the installation assets might change between releases. Use caution when copying installation files from an earlier OpenShift Container Platform version. |
At the prompts, provide the configuration details for your cloud:
Optional: Select an SSH key to use to access your cluster machines.
For production OpenShift Container Platform clusters on which you want to perform installation debugging or disaster recovery on, specify an SSH key that your |
Select azure as the platform to target.
If you do not have a Microsoft Azure profile stored on your computer, specify the following Azure parameter values for your subscription and service principal:
azure subscription id: The subscription ID to use for the cluster.
Specify the id
value in your account output.
azure tenant id: The tenant ID. Specify the tenantId
value in your
account output.
azure service principal client id: The value of the appId
parameter
for the service principal.
azure service principal client secret: The value of the password
parameter for the service principal.
Select the region to deploy the cluster to.
Select the base domain to deploy the cluster to. The base domain corresponds to the Azure DNS Zone that you created for your cluster.
Enter a descriptive name for your cluster.
All Azure resources that are available through public endpoints are subject to resource name restrictions, and you cannot create resources that use certain terms. For a list of terms that Azure restricts, see Resolve reserved resource name errors in the Azure documentation. |
Paste the pull secret that you obtained from the Pull Secret page on the Red Hat OpenShift Cluster Manager site.
Modify the install-config.yaml
file. You can find more information about
the available parameters in the Installation configuration parameters section.
Back up the install-config.yaml
file so that you can use
it to install multiple clusters.
The |
Before you deploy an OpenShift Container Platform cluster, you provide parameter values to
describe your account on the cloud platform that hosts your cluster
and optionally customize your
cluster’s platform. When you create the install-config.yaml
installation
configuration file, you provide values for the required parameters through the
command line. If you customize your cluster, you can modify the
install-config.yaml
file to provide more details about the platform.
You cannot modify these parameters in the |
Parameter | Description | Values |
---|---|---|
|
The base domain of your cloud provider. This value is used to create routes
to your OpenShift Container Platform cluster components. The full DNS name for your cluster
is a combination of the |
A fully-qualified domain or subdomain name, such as |
|
The cloud provider to host the control plane machines. This parameter value
must match the |
|
|
The cloud provider to host the worker machines. This parameter value
must match the |
|
|
The name of your cluster. |
A string that contains uppercase or lowercase letters, such as |
|
The region to deploy your cluster in. |
A valid region for your cloud, such as |
|
The pull secret that you obtained from the Pull Secret page on the Red Hat OpenShift Cluster Manager site. You use this pull secret to authenticate with the services that are provided by the included authorities, including Quay.io, which serves the container images for OpenShift Container Platform components. |
|
Parameter | Description | Values | ||
---|---|---|---|---|
|
The SSH key to use to access your cluster machines.
|
A valid, local public SSH key that you added to the |
||
|
Whether to enable or disable FIPS mode. By default, FIPS mode is not enabled. If FIPS mode is enabled, the Red Hat Enterprise Linux CoreOS (RHCOS) machines that OpenShift Container Platform runs on bypass the default Kubernetes cryptography suite and use the cryptography modules that are provided with RHCOS instead. |
|
||
|
How to publish the user-facing endpoints of your cluster. |
|
||
|
Whether to enable or disable simultaneous multithreading, or
|
|
||
|
The number of compute machines, which are also known as worker machines, to provision. |
A positive integer greater than or equal to |
||
|
Whether to enable or disable simultaneous multithreading, or
|
|
||
|
The number of control plane machines to provision. |
A positive integer greater than or equal to |
Parameter | Description | Values |
---|---|---|
|
The Azure VM instance type. |
VMs that use Windows or Linux as the operating system. See the Guest operating systems supported on Azure Stack in the Azure documentation. |
|
The Azure disk size for the VM. |
Integer that represents the size of the disk in GB, for example |
|
The name of the resource group that contains the DNS zone for your base domain. |
String, for example |
|
The name of the Azure region that hosts your cluster. |
Any valid region name. |
|
List of availability zones to place machines in. For high availability, specify at least two zones. |
List of zones, for example |
|
The name of the resource group that contains the existing VNet that you want to deploy your cluster to. This name cannot be the same as the |
String. |
|
The name of the existing VNet that you want to deploy your cluster to. |
String. |
|
The name of the existing subnet in your VNet that you want to deploy your control plane machines to. |
Valid CIDR, for example |
|
The name of the existing subnet in your VNet that you want to deploy your compute machines to. |
Valid CIDR, for example |
You cannot customize Azure Availability Zones or Use tags to organize your Azure resources with an Azure cluster. |
install-config.yaml
file for AzureYou can customize the install-config.yaml
file to specify more details about your OpenShift Container Platform cluster’s platform or modify the values of the required parameters.
This sample YAML file is provided for reference only. You must obtain your |
apiVersion: v1
baseDomain: example.com (1)
controlPlane: (2)
hyperthreading: Enabled (3) (4)
name: master
platform:
azure:
osDisk:
diskSizeGB: 1024 (5)
type: Standard_D8s_v3
replicas: 3
compute: (2)
- hyperthreading: Enabled (3)
name: worker
platform:
azure:
type: Standard_D2s_v3
osDisk:
diskSizeGB: 512 (5)
zones: (6)
- "1"
- "2"
- "3"
replicas: 5
metadata:
name: test-cluster (1)
networking:
clusterNetwork:
- cidr: 10.128.0.0/14
hostPrefix: 23
machineCIDR: 10.0.0.0/16
networkType: OpenShiftSDN
serviceNetwork:
- 172.30.0.0/16
platform:
azure:
region: centralus (1)
baseDomainResourceGroupName: resource_group (7)
networkResourceGroupName: vnet_resource_group (8)
virtualNetwork: vnet (9)
controlPlaneSubnet: control_plane_subnet (10)
computeSubnet: compute_subnet (11)
pullSecret: '{"auths": ...}' (1)
fips: false (12)
sshKey: ssh-ed25519 AAAA... (13)
1 | Required. The installation program prompts you for this value. | ||
2 | If you do not provide these parameters and values, the installation program provides the default value. | ||
3 | The controlPlane section is a single mapping, but the compute section is a sequence of mappings. To meet the requirements of the different data structures, the first line of the compute section must begin with a hyphen, - , and the first line of the controlPlane section must not. Although both sections currently define a single machine pool, it is possible that future versions of OpenShift Container Platform will support defining multiple compute pools during installation. Only one control plane pool is used. |
||
4 | Whether to enable or disable simultaneous multithreading, or hyperthreading . By default, simultaneous multithreading is enabled to increase the performance of your machines' cores. You can disable it by setting the parameter value to Disabled . If you disable simultaneous multithreading in some cluster machines, you must disable it in all cluster machines.
|
||
5 | You can specify the size of the disk to use in GB. Minimum recommendation for master nodes is 1024 GB. | ||
6 | Specify a list of zones to deploy your machines to. For high availability, specify at least two zones. | ||
7 | Specify the name of the resource group that contains the DNS zone for your base domain. | ||
8 | If you use an existing VNet, specify the name of the resource group that contains it. | ||
9 | If you use an existing VNet, specify its name. | ||
10 | If you use an existing VNet, specify the name of the subnet to host the control plane machines. | ||
11 | If you use an existing VNet, specify the name of the subnet to host the compute machines. | ||
12 | Whether to enable or disable FIPS mode. By default, FIPS mode is not enabled. If FIPS mode is enabled, the Red Hat Enterprise Linux CoreOS (RHCOS) machines that OpenShift Container Platform runs on bypass the default Kubernetes cryptography suite and use the cryptography modules that are provided with RHCOS instead. | ||
13 | You can optionally provide the sshKey value that you use to access the machines in your cluster.
|
Production environments can deny direct access to the Internet and instead have
an HTTP or HTTPS proxy available. You can configure a new OpenShift Container Platform
cluster to use a proxy by configuring the proxy settings in the
install-config.yaml
file.
An existing install-config.yaml
file.
Review the sites that your cluster requires access to and determine whether any need to bypass the proxy. By default, all cluster egress traffic is proxied, including calls to hosting cloud provider APIs. Add sites to the Proxy object’s spec.noProxy
field to bypass the proxy if necessary.
The Proxy object’s |
Edit your install-config.yaml
file and add the proxy settings. For example:
apiVersion: v1
baseDomain: my.domain.com
proxy:
httpProxy: http://<username>:<pswd>@<ip>:<port> (1)
httpsProxy: http://<username>:<pswd>@<ip>:<port> (2)
noProxy: example.com (3)
additionalTrustBundle: | (4)
-----BEGIN CERTIFICATE-----
<MY_TRUSTED_CA_CERT>
-----END CERTIFICATE-----
...
1 | A proxy URL to use for creating HTTP connections outside the cluster. The
URL scheme must be http . If you use an MITM transparent proxy network that does not require additional proxy configuration but requires additional CAs, you must not specify an httpProxy value. |
2 | A proxy URL to use for creating HTTPS connections outside the cluster. If
this field is not specified, then httpProxy is used for both HTTP and HTTPS
connections.
If you use an MITM transparent proxy network that does not require additional proxy configuration but requires additional CAs, you must not specify an httpsProxy value. |
3 | A comma-separated list of destination domain names, domains, IP addresses, or
other network CIDRs to exclude proxying. Preface a domain with . to include
all subdomains of that domain. Use * to bypass proxy for all destinations. |
4 | If provided, the installation program generates a ConfigMap that is named user-ca-bundle in
the openshift-config namespace that contains one or more additional CA
certificates that are required for proxying HTTPS connections. The Cluster Network
Operator then creates a trusted-ca-bundle ConfigMap that merges these contents
with the Red Hat Enterprise Linux CoreOS (RHCOS) trust bundle, and this ConfigMap is referenced in the Proxy
object’s trustedCA field. The additionalTrustBundle field is required unless
the proxy’s identity certificate is signed by an authority from the RHCOS trust
bundle.
If you use an MITM transparent proxy network that does not require additional proxy configuration but requires additional CAs, you must provide the MITM CA certificate. |
The installation program does not support the proxy |
Save the file and reference it when installing OpenShift Container Platform.
The installation program creates a cluster-wide proxy that is named cluster
that uses the proxy
settings in the provided install-config.yaml
file. If no proxy settings are
provided, a cluster
Proxy object is still created, but it will have a nil
spec
.
Only the Proxy object named |
You can install OpenShift Container Platform on a compatible cloud platform.
You can run the |
Configure an account with the cloud platform that hosts your cluster.
Obtain the OpenShift Container Platform installation program and the pull secret for your cluster.
Run the installation program:
$ ./openshift-install create cluster --dir=<installation_directory> \ (1) --log-level=info (2)
1 | For <installation_directory> , specify the
location of your customized ./install-config.yaml file. |
2 | To view different installation details, specify warn , debug , or
error instead of info . |
If the cloud provider account that you configured on your host does not have sufficient permissions to deploy the cluster, the installation process stops, and the missing permissions are displayed. |
When the cluster deployment completes, directions for accessing your cluster,
including a link to its web console and credentials for the kubeadmin
user,
display in your terminal.
The Ignition config files that the installation program generates contain certificates that expire after 24 hours. You must keep the cluster running for 24 hours in a non-degraded state to ensure that the first certificate rotation has finished. |
You must not delete the installation program or the files that the installation program creates. Both are required to delete the cluster. |
You can install the OpenShift CLI (oc
) in order to interact with OpenShift Container Platform from a
command-line interface. You can install oc
on Linux, Windows, or macOS.
If you installed an earlier version of |
You can install the OpenShift CLI (oc
) binary on Linux by using the following procedure.
Navigate to the Infrastructure Provider page on the Red Hat OpenShift Cluster Manager site.
Select your infrastructure provider, and, if applicable, your installation type.
In the Command-line interface section, select Linux from the drop-down menu and click Download command-line tools.
Unpack the archive:
$ tar xvzf <file>
Place the oc
binary in a directory that is on your PATH
.
To check your PATH
, execute the following command:
$ echo $PATH
After you install the CLI, it is available using the oc
command:
$ oc <command>
You can install the OpenShift CLI (oc
) binary on Windows by using the following procedure.
Navigate to the Infrastructure Provider page on the Red Hat OpenShift Cluster Manager site.
Select your infrastructure provider, and, if applicable, your installation type.
In the Command-line interface section, select Windows from the drop-down menu and click Download command-line tools.
Unzip the archive with a ZIP program.
Move the oc
binary to a directory that is on your PATH
.
To check your PATH
, open the command prompt and execute the following command:
C:\> path
After you install the CLI, it is available using the oc
command:
C:\> oc <command>
You can install the OpenShift CLI (oc
) binary on macOS by using the following procedure.
Navigate to the Infrastructure Provider page on the Red Hat OpenShift Cluster Manager site.
Select your infrastructure provider, and, if applicable, your installation type.
In the Command-line interface section, select MacOS from the drop-down menu and click Download command-line tools.
Unpack and unzip the archive.
Move the oc
binary to a directory on your PATH.
To check your PATH
, open a terminal and execute the following command:
$ echo $PATH
After you install the CLI, it is available using the oc
command:
$ oc <command>
You can log in to your cluster as a default system user by exporting the cluster kubeconfig
file.
The kubeconfig
file contains information about the cluster that is used by the CLI to connect a client to the correct cluster and API server.
The file is specific to a cluster and is created during OpenShift Container Platform installation.
Deploy an OpenShift Container Platform cluster.
Install the oc
CLI.
Export the kubeadmin
credentials:
$ export KUBECONFIG=<installation_directory>/auth/kubeconfig (1)
1 | For <installation_directory> , specify the path to the directory that you stored
the installation files in. |
Verify you can run oc
commands successfully using the exported configuration:
$ oc whoami system:admin
If necessary, you can opt out of remote health reporting.