5.3. Installing a cluster on bare metal in a restricted network

Procedure

1. Configure DHCP or set static IP addresses on each node.
2. Provision the required load balancers.
3. Configure the ports for your machines.
4. Configure DNS.
5. Ensure network connectivity.

Procedure

1. 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 ed25519 -N '' \
       -f <path>/<file_name> 1

   1

   Specify the path and file name, such as ~/.ssh/id_rsa, of the new SSH key. If you have an existing key pair, ensure your public key is in the your ~/.ssh directory.

   Running this command generates an SSH key that does not require a password in the location that you specified.

   注意

   If you plan to install an OpenShift Container Platform cluster that uses FIPS Validated / Modules in Process cryptographic libraries on the x86_64 architecture, do not create a key that uses the ed25519 algorithm. Instead, create a key that uses the rsa or ecdsa algorithm.

2. Start the ssh-agent process as a background task:

   $ eval "$(ssh-agent -s)"

   Example output

   Agent pid 31874

3. Add your SSH private key to the ssh-agent:

   $ ssh-add <path>/<file_name> 1

   Example output

   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

4. Set the GOOGLE_APPLICATION_CREDENTIALS environment variable to the full path to your service account private key file.

   $ export GOOGLE_APPLICATION_CREDENTIALS="<your_service_account_file>"

5. Verify that the credentials were applied.

   $ gcloud auth list

Procedure

1. Create an installation directory to store your required installation assets in:

   $ mkdir <installation_directory>

   重要

   You must create a 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.

2. Customize the following install-config.yaml file template and save it in the <installation_directory>.

   注意

   You must name this configuration file install-config.yaml.

   • Unless you use a registry that RHCOS trusts by default, such as docker.io, you must provide the contents of the certificate for your mirror repository in the additionalTrustBundle section. In most cases, you must provide the certificate for your mirror.
   • You must include the imageContentSources section from the output of the command to mirror the repository.

3. Back up the install-config.yaml file so that you can use it to install multiple clusters.

   重要

   The install-config.yaml file is consumed during the next step of the installation process. You must back it up now.

Procedure

1. Generate the Kubernetes manifests for the cluster:

   $ ./openshift-install create manifests --dir=<installation_directory> 1

   Example output

   INFO Consuming Install Config from target directory
   WARNING Making control-plane schedulable by setting MastersSchedulable to true for Scheduler cluster settings

   1

   For <installation_directory>, specify the installation directory that contains the install-config.yaml file you created.

   Because you create your own compute machines later in the installation process, you can safely ignore this warning.

2. Remove the Kubernetes manifest files that define the control plane machines:

   $ rm -f <installation_directory>/openshift/99_openshift-cluster-api_master-machines-*.yaml

   By removing these files, you prevent the cluster from automatically generating control plane machines.

3. Optional: If you do not want the cluster to provision compute machines, remove the Kubernetes manifest files that define the worker machines:

   $ rm -f <installation_directory>/openshift/99_openshift-cluster-api_worker-machineset-*.yaml

   Because you create and manage the worker machines yourself, you do not need to initialize these machines.

1. Modify the <installation_directory>/manifests/cluster-scheduler-02-config.yml Kubernetes manifest file to prevent pods from being scheduled on the control plane machines:

   1. Open the <installation_directory>/manifests/cluster-scheduler-02-config.yml file.
   2. Locate the mastersSchedulable parameter and set its value to False.
   3. Save and exit the file.

2. Optional: If you do not want the Ingress Operator to create DNS records on your behalf, remove the privateZone and publicZone sections from the <installation_directory>/manifests/cluster-dns-02-config.yml DNS configuration file:

   apiVersion: config.openshift.io/v1
   kind: DNS
   metadata:
     creationTimestamp: null
     name: cluster
   spec:
     baseDomain: example.openshift.com
     privateZone: 1
       id: mycluster-100419-private-zone
     publicZone: 2
       id: example.openshift.com
   status: {}

   1 2

   Remove this section completely.

   If you do so, you must add ingress DNS records manually in a later step.

3. Obtain the Ignition config files:

   $ ./openshift-install create ignition-configs --dir=<installation_directory> 1

   1

   For <installation_directory>, specify the same installation directory.

   The following files are generated in the directory:

   .
   ├── auth
   │   ├── kubeadmin-password
   │   └── kubeconfig
   ├── bootstrap.ign
   ├── master.ign
   ├── metadata.json
   └── worker.ign

Procedure

1. Create the contents of the chrony.conf file and encode it as base64. For example:

   $ cat << EOF | base64
       pool 0.rhel.pool.ntp.org iburst 1
       driftfile /var/lib/chrony/drift
       makestep 1.0 3
       rtcsync
       logdir /var/log/chrony
   EOF

   1

   Specify any valid, reachable time source, such as the one provided by your DHCP server.

   Example output

   ICAgIHNlcnZlciBjbG9jay5yZWRoYXQuY29tIGlidXJzdAogICAgZHJpZnRmaWxlIC92YXIvbGli
   L2Nocm9ueS9kcmlmdAogICAgbWFrZXN0ZXAgMS4wIDMKICAgIHJ0Y3N5bmMKICAgIGxvZ2RpciAv
   dmFyL2xvZy9jaHJvbnkK

2. Create the MachineConfig object file, replacing the base64 string with the one you just created. This example adds the file to master nodes. You can change it to worker or make an additional MachineConfig for the worker role. Create MachineConfig files for each type of machine that your cluster uses:

   $ cat << EOF > ./99-masters-chrony-configuration.yaml
   apiVersion: machineconfiguration.openshift.io/v1
   kind: MachineConfig
   metadata:
     labels:
       machineconfiguration.openshift.io/role: master
     name: 99-masters-chrony-configuration
   spec:
     config:
       ignition:
         config: {}
         security:
           tls: {}
         timeouts: {}
         version: 2.2.0
       networkd: {}
       passwd: {}
       storage:
         files:
         - contents:
             source: data:text/plain;charset=utf-8;base64,ICAgIHNlcnZlciBjbG9jay5yZWRoYXQuY29tIGlidXJzdAogICAgZHJpZnRmaWxlIC92YXIvbGliL2Nocm9ueS9kcmlmdAogICAgbWFrZXN0ZXAgMS4wIDMKICAgIHJ0Y3N5bmMKICAgIGxvZ2RpciAvdmFyL2xvZy9jaHJvbnkK
             verification: {}
           filesystem: root
           mode: 420
           path: /etc/chrony.conf
     osImageURL: ""
   EOF

3. Make a backup copy of the configuration files.

4. Apply the configurations in one of two ways:

   • If the cluster is not up yet, after you generate manifest files, add this file to the <installation_directory>/openshift directory, and then continue to create the cluster.

   • If the cluster is already running, apply the file:

     $ oc apply -f ./99-masters-chrony-configuration.yaml

Procedure

1. Monitor the bootstrap process:

   $ ./openshift-install --dir=<installation_directory> wait-for bootstrap-complete \ 1
       --log-level=info 2

   1

   For <installation_directory>, specify the path to the directory that you stored the installation files in.

   2

   To view different installation details, specify warn, debug, or error instead of info.

   Example output

   INFO Waiting up to 30m0s for the Kubernetes API at https://api.test.example.com:6443...
   INFO API v1.18.3 up
   INFO Waiting up to 30m0s for bootstrapping to complete...
   INFO It is now safe to remove the bootstrap resources

   The command succeeds when the Kubernetes API server signals that it has been bootstrapped on the control plane machines.

2. After bootstrap process is complete, remove the bootstrap machine from the load balancer.

   重要

   You must remove the bootstrap machine from the load balancer at this point. You can also remove or reformat the machine itself.

Procedure

1. 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.

2. Verify you can run oc commands successfully using the exported configuration:

   $ oc whoami

   Example output

   system:admin

Procedure

1. Confirm that the cluster recognizes the machines:

   $ oc get nodes

   Example output

   NAME      STATUS    ROLES   AGE  VERSION
   master-0  Ready     master  63m  v1.18.3
   master-1  Ready     master  63m  v1.18.3
   master-2  Ready     master  64m  v1.18.3
   worker-0  NotReady  worker  76s  v1.18.3
   worker-1  NotReady  worker  70s  v1.18.3

   The output lists all of the machines that you created.

2. Review the pending CSRs and ensure that you see the client requests with the Pending or Approved status for each machine that you added to the cluster:

   $ oc get csr

   Example output

   NAME        AGE     REQUESTOR                                                                   CONDITION
   csr-8b2br   15m     system:serviceaccount:openshift-machine-config-operator:node-bootstrapper   Pending
   csr-8vnps   15m     system:serviceaccount:openshift-machine-config-operator:node-bootstrapper   Pending
   ...

   In this example, two machines are joining the cluster. You might see more approved CSRs in the list.

3. If the CSRs were not approved, after all of the pending CSRs for the machines you added are in Pending status, approve the CSRs for your cluster machines:

   注意

   Because the CSRs rotate automatically, approve your CSRs within an hour of adding the machines to the cluster. If you do not approve them within an hour, the certificates will rotate, and more than two certificates will be present for each node. You must approve all of these certificates. Once the client CSR is approved, the Kubelet creates a secondary CSR for the serving certificate, which requires manual approval. Then, subsequent serving certificate renewal requests are automatically approved by the machine-approver if the Kubelet requests a new certificate with identical parameters.

   • To approve them individually, run the following command for each valid CSR:

     $ oc adm certificate approve <csr_name> 1

     1

     <csr_name> is the name of a CSR from the list of current CSRs.

   • To approve all pending CSRs, run the following command:

     $ oc get csr -o go-template='{{range .items}}{{if not .status}}{{.metadata.name}}{{"\n"}}{{end}}{{end}}' | xargs --no-run-if-empty oc adm certificate approve

4. Now that your client requests are approved, you must review the server requests for each machine that you added to the cluster:

   $ oc get csr

   Example output

   NAME        AGE     REQUESTOR                                                                   CONDITION
   csr-bfd72   5m26s   system:node:ip-10-0-50-126.us-east-2.compute.internal                       Pending
   csr-c57lv   5m26s   system:node:ip-10-0-95-157.us-east-2.compute.internal                       Pending
   ...

5. If the remaining CSRs are not approved, and are in the Pending status, approve the CSRs for your cluster machines:

   • To approve them individually, run the following command for each valid CSR:

     $ oc adm certificate approve <csr_name> 1

     1

     <csr_name> is the name of a CSR from the list of current CSRs.

   • To approve all pending CSRs, run the following command:

     $ oc get csr -o go-template='{{range .items}}{{if not .status}}{{.metadata.name}}{{"\n"}}{{end}}{{end}}' | xargs oc adm certificate approve

6. After all client and server CSRs have been approved, the machines have the Ready status. Verify this by running the following command:

   $ oc get nodes

   Example output

   NAME      STATUS    ROLES   AGE  VERSION
   master-0  Ready     master  73m  v1.20.0
   master-1  Ready     master  73m  v1.20.0
   master-2  Ready     master  74m  v1.20.0
   worker-0  Ready     worker  11m  v1.20.0
   worker-1  Ready     worker  11m  v1.20.0

   注意

   It can take a few minutes after approval of the server CSRs for the machines to transition to the Ready status.

Procedure

1. Watch the cluster components come online:

   $ watch -n5 oc get clusteroperators

   Example output

   NAME                                 VERSION   AVAILABLE   PROGRESSING   DEGRADED   SINCE
   authentication                       4.5.4     True        False         False      69s
   cloud-credential                     4.5.4     True        False         False      12m
   cluster-autoscaler                   4.5.4     True        False         False      11m
   console                              4.5.4     True        False         False      46s
   dns                                  4.5.4     True        False         False      11m
   image-registry                       4.5.4     True        False         False      5m26s
   ingress                              4.5.4     True        False         False      5m36s
   kube-apiserver                       4.5.4     True        False         False      8m53s
   kube-controller-manager              4.5.4     True        False         False      7m24s
   kube-scheduler                       4.5.4     True        False         False      12m
   machine-api                          4.5.4     True        False         False      12m
   machine-config                       4.5.4     True        False         False      7m36s
   marketplace                          4.5.4     True        False         False      7m54m
   monitoring                           4.5.4     True        False         False      7h54s
   network                              4.5.4     True        False         False      5m9s
   node-tuning                          4.5.4     True        False         False      11m
   openshift-apiserver                  4.5.4     True        False         False      11m
   openshift-controller-manager         4.5.4     True        False         False      5m943s
   openshift-samples                    4.5.4     True        False         False      3m55s
   operator-lifecycle-manager           4.5.4     True        False         False      11m
   operator-lifecycle-manager-catalog   4.5.4     True        False         False      11m
   service-ca                           4.5.4     True        False         False      11m
   service-catalog-apiserver            4.5.4     True        False         False      5m26s
   service-catalog-controller-manager   4.5.4     True        False         False      5m25s
   storage                              4.5.4     True        False         False      5m30s

2. Configure the Operators that are not available.

Procedure

1. Confirm that all the cluster components are online with the following command:

   $ watch -n5 oc get clusteroperators

   Example output

   NAME                                       VERSION   AVAILABLE   PROGRESSING   DEGRADED   SINCE
   authentication                             4.5.4     True        False         False      7m56s
   cloud-credential                           4.5.4     True        False         False      31m
   cluster-autoscaler                         4.5.4     True        False         False      16m
   console                                    4.5.4     True        False         False      10m
   csi-snapshot-controller                    4.5.4     True        False         False      16m
   dns                                        4.5.4     True        False         False      22m
   etcd                                       4.5.4     False       False         False      25s
   image-registry                             4.5.4     True        False         False      16m
   ingress                                    4.5.4     True        False         False      16m
   insights                                   4.5.4     True        False         False      17m
   kube-apiserver                             4.5.4     True        False         False      19m
   kube-controller-manager                    4.5.4     True        False         False      20m
   kube-scheduler                             4.5.4     True        False         False      20m
   kube-storage-version-migrator              4.5.4     True        False         False      16m
   machine-api                                4.5.4     True        False         False      22m
   machine-config                             4.5.4     True        False         False      22m
   marketplace                                4.5.4     True        False         False      16m
   monitoring                                 4.5.4     True        False         False      10m
   network                                    4.5.4     True        False         False      23m
   node-tuning                                4.5.4     True        False         False      23m
   openshift-apiserver                        4.5.4     True        False         False      17m
   openshift-controller-manager               4.5.4     True        False         False      15m
   openshift-samples                          4.5.4     True        False         False      16m
   operator-lifecycle-manager                 4.5.4     True        False         False      22m
   operator-lifecycle-manager-catalog         4.5.4     True        False         False      22m
   operator-lifecycle-manager-packageserver   4.5.4     True        False         False      18m
   service-ca                                 4.5.4     True        False         False      23m
   service-catalog-apiserver                  4.5.4     True        False         False      23m
   service-catalog-controller-manager         4.5.4     True        False         False      23m
   storage                                    4.5.4     True        False         False      17m

   Alternatively, the following command notifies you when all of the clusters are available. It also retrieves and displays credentials:

   $ ./openshift-install --dir=<installation_directory> wait-for install-complete 1

   1

   For <installation_directory>, specify the path to the directory that you stored the installation files in.

   Example output

   INFO Waiting up to 30m0s for the cluster to initialize...

   The command succeeds when the Cluster Version Operator finishes deploying the OpenShift Container Platform cluster from Kubernetes API server.

   重要

   The Ignition config files that the installation program generates contain certificates that expire after 24 hours, which are then renewed at that time. If the cluster is shut down before renewing the certificates and the cluster is later restarted after the 24 hours have elapsed, the cluster automatically recovers the expired certificates. The exception is that you must manually approve the pending node-bootstrapper certificate signing requests (CSRs) to recover kubelet certificates. See the documentation for Recovering from expired control plane certificates for more information.

2. Confirm that the Kubernetes API server is communicating with the pods.

   1. To view a list of all pods, use the following command:

      $ oc get pods --all-namespaces

      Example output

      NAMESPACE                         NAME                                            READY   STATUS      RESTARTS   AGE
      openshift-apiserver-operator      openshift-apiserver-operator-85cb746d55-zqhs8   1/1     Running     1          9m
      openshift-apiserver               apiserver-67b9g                                 1/1     Running     0          3m
      openshift-apiserver               apiserver-ljcmx                                 1/1     Running     0          1m
      openshift-apiserver               apiserver-z25h4                                 1/1     Running     0          2m
      openshift-authentication-operator authentication-operator-69d5d8bf84-vh2n8        1/1     Running     0          5m
      ...

   2. View the logs for a pod that is listed in the output of the previous command by using the following command:

      $ oc logs <pod_name> -n <namespace> 1

      1

      Specify the pod name and namespace, as shown in the output of the previous command.

      If the pod logs display, the Kubernetes API server can communicate with the cluster machines.

3. Register your cluster on the Cluster registration page.