Chapter 16. Configuring a custom PKI

Procedure

1. 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.

   Note

   The installation program does not support the proxy readinessEndpoints field.

2. Save the file and reference it when installing OpenShift Container Platform.

Procedure

1. Create a ConfigMap that contains any additional CA certificates required for proxying HTTPS connections.

   Note

   You can skip this step if the proxy’s identity certificate is signed by an authority from the RHCOS trust bundle.

   1. Create a file called user-ca-bundle.yaml with the following contents, and provide the values of your PEM-encoded certificates:

      apiVersion: v1
      data:
        ca-bundle.crt: | 1
          <MY_PEM_ENCODED_CERTS> 2
      kind: ConfigMap
      metadata:
        name: user-ca-bundle 3
        namespace: openshift-config 4

      1

      This data key must be named ca-bundle.crt.

      2

      One or more PEM-encoded X.509 certificates used to sign the proxy’s identity certificate.

      3

      The ConfigMap name that will be referenced from the Proxy object.

      4

      The ConfigMap must be in the openshift-config namespace.

   2. Create the ConfigMap from this file:

      $ oc create -f user-ca-bundle.yaml

2. Use the oc edit command to modify the Proxy object:

   $ oc edit proxy/cluster

3. Configure the necessary fields for the proxy:

   apiVersion: config.openshift.io/v1
   kind: Proxy
   metadata:
     name: cluster
   spec:
     httpProxy: http://<username>:<pswd>@<ip>:<port> 1
     httpsProxy: http://<username>:<pswd>@<ip>:<port> 2
     noProxy: example.com 3
     readinessEndpoints:
     - http://www.google.com 4
     - https://www.google.com
     trustedCA:
       name: user-ca-bundle 5

   1

   A proxy URL to use for creating HTTP connections outside the cluster. The URL scheme must be http.

   2

   A proxy URL to use for creating HTTPS connections outside the cluster. If this is not specified, then httpProxy is used for both HTTP and HTTPS connections.

   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. Note that if you scale up workers not included in networking.machineCIDR from the installation configuration, you must add them to this list to prevent connection issues.

   4

   One or more URLs external to the cluster to use to perform a readiness check before writing the httpProxy and httpsProxy values to status.

   5

   A reference to the ConfigMap in the openshift-config namespace that contains additional CA certificates required for proxying HTTPS connections. Note that the ConfigMap must already exist before referencing it here. This field is required unless the proxy’s identity certificate is signed by an authority from the RHCOS trust bundle.

4. Save the file to apply the changes.