Installation workflow - Installing bare metal clusters on IBM Cloud | Installing

Preparing the provisioner node for OpenShift Container Platform installation on IBM Cloud
Configuring the public subnet
Retrieving the OpenShift Container Platform installer
Extracting the OpenShift Container Platform installer
Configuring the install-config.yaml file
Additional install-config parameters
Root device hints
Creating the OpenShift Container Platform manifests
Deploying the cluster via the OpenShift Container Platform installer
Following the installation

Preparing the provisioner node for OpenShift Container Platform installation on IBM Cloud

Perform the following steps to prepare the provisioner node.

Procedure

Create a non-root user (kni) and provide that user with sudo privileges:

# useradd kni

# passwd kni

# echo "kni ALL=(root) NOPASSWD:ALL" | tee -a /etc/sudoers.d/kni

# chmod 0440 /etc/sudoers.d/kni

Create an ssh key for the new user:

# su - kni -c "ssh-keygen -f /home/kni/.ssh/id_rsa -N ''"

Use Red Hat Subscription Manager to register the provisioner node:

$ sudo subscription-manager register --username=<user> --password=<pass> --auto-attach

$ sudo subscription-manager repos --enable=rhel-8-for-x86_64-appstream-rpms \
                                  --enable=rhel-8-for-x86_64-baseos-rpms

For more information about Red Hat Subscription Manager, see Using and Configuring Red Hat Subscription Manager.

Install the following packages:

$ sudo dnf install -y libvirt qemu-kvm mkisofs python3-devel jq ipmitool

Modify the user to add the libvirt group to the newly created user:
```
$ sudo usermod --append --groups libvirt kni
```
Start firewalld:
```
$ sudo systemctl start firewalld
```
Enable firewalld:
```
$ sudo systemctl enable firewalld
```

Start the http service:

$ sudo firewall-cmd --zone=public --add-service=http --permanent

$ sudo firewall-cmd --reload

Start and enable the libvirtd service:
```
$ sudo systemctl enable libvirtd --now
```
Set the ID of the provisioner node:
```
$ PRVN_HOST_ID=<ID>
```
You can view the ID with the following ibmcloud command:
```
$ ibmcloud sl hardware list
```
Set the ID of the public subnet:
```
$ PUBLICSUBNETID=<ID>
```
You can view the ID with the following ibmcloud command:
```
$ ibmcloud sl subnet list
```
Set the ID of the private subnet:
```
$ PRIVSUBNETID=<ID>
```
You can view the ID with the following ibmcloud command:
```
$ ibmcloud sl subnet list
```

Set the provisioner node public IP address:

$ PRVN_PUB_IP=$(ibmcloud sl hardware detail $PRVN_HOST_ID --output JSON | jq .primaryIpAddress -r)

Set the CIDR for the public network:

$ PUBLICCIDR=$(ibmcloud sl subnet detail $PUBLICSUBNETID --output JSON | jq .cidr)

Set the IP address and CIDR for the public network:
```
$ PUB_IP_CIDR=$PRVN_PUB_IP/$PUBLICCIDR
```

Set the gateway for the public network:

$ PUB_GATEWAY=$(ibmcloud sl subnet detail $PUBLICSUBNETID --output JSON | jq .gateway -r)

Set the private IP address of the provisioner node:

$ PRVN_PRIV_IP=$(ibmcloud sl hardware detail $PRVN_HOST_ID --output JSON | \
                 jq .primaryBackendIpAddress -r)

Set the CIDR for the private network:

$ PRIVCIDR=$(ibmcloud sl subnet detail $PRIVSUBNETID --output JSON | jq .cidr)

Set the IP address and CIDR for the private network:
```
$ PRIV_IP_CIDR=$PRVN_PRIV_IP/$PRIVCIDR
```

Set the gateway for the private network:

$ PRIV_GATEWAY=$(ibmcloud sl subnet detail $PRIVSUBNETID --output JSON | jq .gateway -r)

Set up the bridges for the baremetal and provisioning networks:

$ sudo nohup bash -c "
    nmcli --get-values UUID con show | xargs -n 1 nmcli con delete
    nmcli connection add ifname provisioning type bridge con-name provisioning
    nmcli con add type bridge-slave ifname eth1 master provisioning
    nmcli connection add ifname baremetal type bridge con-name baremetal
    nmcli con add type bridge-slave ifname eth2 master baremetal
    nmcli connection modify baremetal ipv4.addresses $PUB_IP_CIDR ipv4.method manual ipv4.gateway $PUB_GATEWAY
    nmcli connection modify provisioning ipv4.addresses 172.22.0.1/24,$PRIV_IP_CIDR ipv4.method manual
    nmcli connection modify provisioning +ipv4.routes \"10.0.0.0/8 $PRIV_GATEWAY\"
    nmcli con down baremetal
    nmcli con up baremetal
    nmcli con down provisioning
    nmcli con up provisioning
    init 6
"

For eth1 and eth2, substitute the appropriate interface name, as needed.

If required, SSH back into the provisioner node:

# ssh kni@provisioner.<cluster-name>.<domain>

Verify the connection bridges have been properly created:

$ sudo nmcli con show

Example output

NAME               UUID                                  TYPE      DEVICE
baremetal          4d5133a5-8351-4bb9-bfd4-3af264801530  bridge    baremetal
provisioning       43942805-017f-4d7d-a2c2-7cb3324482ed  bridge    provisioning
virbr0             d9bca40f-eee1-410b-8879-a2d4bb0465e7  bridge    virbr0
bridge-slave-eth1  76a8ed50-c7e5-4999-b4f6-6d9014dd0812  ethernet  eth1
bridge-slave-eth2  f31c3353-54b7-48de-893a-02d2b34c4736  ethernet  eth2

Create a pull-secret.txt file:
```
$ vim pull-secret.txt
```
In a web browser, navigate to Install on Bare Metal with user-provisioned infrastructure. In step 1, click Download pull secret. Paste the contents into the pull-secret.txt file and save the contents in the kni user’s home directory.

Configuring the public subnet

All of the OpenShift Container Platform cluster nodes must be on the public subnet. IBM Cloud® does not provide a DHCP server on the subnet. Set it up separately on the provisioner node.

You must reset the BASH variables defined when preparing the provisioner node. Rebooting the provisioner node after preparing it will delete the BASH variables previously set.

Procedure

Install dnsmasq:
```
$ sudo dnf install dnsmasq
```
Open the dnsmasq configuration file:
```
$ sudo vi /etc/dnsmasq.conf
```

Add the following configuration to the dnsmasq configuration file:

interface=baremetal
except-interface=lo
bind-dynamic
log-dhcp

dhcp-range=<ip_addr>,<ip_addr>,<pub_cidr> (1)
dhcp-option=baremetal,121,0.0.0.0/0,<pub_gateway>,<prvn_priv_ip>,<prvn_pub_ip> (2)

dhcp-hostsfile=/var/lib/dnsmasq/dnsmasq.hostsfile

1	Set the DHCP range. Replace both instances of `<ip_addr>` with one unused IP address from the public subnet so that the `dhcp-range` for the `baremetal` network begins and ends with the same the IP address. Replace `<pub_cidr>` with the CIDR of the public subnet.
2	Set the DHCP option. Replace `<pub_gateway>` with the IP address of the gateway for the `baremetal` network. Replace `<prvn_priv_ip>` with the IP address of the provisioner node’s private IP address on the `provisioning` network. Replace `<prvn_pub_ip>` with the IP address of the provisioner node’s public IP address on the `baremetal` network.

To retrieve the value for <pub_cidr>, execute:

$ ibmcloud sl subnet detail <publicsubnetid> --output JSON | jq .cidr

Replace <publicsubnetid> with the ID of the public subnet.

To retrieve the value for <pub_gateway>, execute:

$ ibmcloud sl subnet detail <publicsubnetid> --output JSON | jq .gateway -r

Replace <publicsubnetid> with the ID of the public subnet.

To retrieve the value for <prvn_priv_ip>, execute:

$ ibmcloud  sl hardware detail <id> --output JSON | \
            jq .primaryBackendIpAddress -r

Replace <id> with the ID of the provisioner node.

To retrieve the value for <prvn_pub_ip>, execute:

$ ibmcloud sl hardware detail <id> --output JSON | jq .primaryIpAddress -r

Replace <id> with the ID of the provisioner node.

Obtain the list of hardware for the cluster:
```
$ ibmcloud sl hardware list
```
Obtain the MAC addresses and IP addresses for each node:
```
$ ibmcloud sl hardware detail <id> --output JSON | \
  jq '.networkComponents[] | \
  "\(.primaryIpAddress) \(.macAddress)"' | grep -v null
```
Replace <id> with the ID of the node.
Example output
```
"10.196.130.144 00:e0:ed:6a:ca:b4"
"141.125.65.215 00:e0:ed:6a:ca:b5"
```
Make a note of the MAC address and IP address of the public network. Make a separate note of the MAC address of the private network, which you will use later in the install-config.yaml file. Repeat this procedure for each node until you have all the public MAC and IP addresses for the public baremetal network, and the MAC addresses of the private provisioning network.
Add the MAC and IP address pair of the public baremetal network for each node into the dnsmasq.hostsfile file:
```
$ sudo vim /var/lib/dnsmasq/dnsmasq.hostsfile
```
Example input
```
00:e0:ed:6a:ca:b5,141.125.65.215,master-0
<mac>,<ip>,master-1
<mac>,<ip>,master-2
<mac>,<ip>,worker-0
<mac>,<ip>,worker-1
...
```
Replace <mac>,<ip> with the public MAC address and public IP address of the corresponding node name.
Start dnsmasq:
```
$ sudo systemctl start dnsmasq
```
Enable dnsmasq so that it starts when booting the node:
```
$ sudo systemctl enable dnsmasq
```

Verify dnsmasq is running:

$ sudo systemctl status dnsmasq

Example output

● dnsmasq.service - DNS caching server.
Loaded: loaded (/usr/lib/systemd/system/dnsmasq.service; enabled; vendor preset: disabled)
Active: active (running) since Tue 2021-10-05 05:04:14 CDT; 49s ago
Main PID: 3101 (dnsmasq)
Tasks: 1 (limit: 204038)
Memory: 732.0K
CGroup: /system.slice/dnsmasq.service
└─3101 /usr/sbin/dnsmasq -k

Open ports 53 and 67 with UDP protocol:

$ sudo firewall-cmd --add-port 53/udp --permanent

$ sudo firewall-cmd --add-port 67/udp --permanent

Add provisioning to the external zone with masquerade:
```
$ sudo firewall-cmd --change-zone=provisioning --zone=external --permanent
```
This step ensures network address translation for IPMI calls to the management subnet.
Reload the firewalld configuration:
```
$ sudo firewall-cmd --reload
```

Retrieving the OpenShift Container Platform installer

Use the stable-4.x version of the installation program and your selected architecture to deploy the generally available stable version of OpenShift Container Platform:

$ export VERSION=stable-4.11

$ export RELEASE_ARCH=<architecture>

$ export RELEASE_IMAGE=$(curl -s https://mirror.openshift.com/pub/openshift-v4/$RELEASE_ARCH/clients/ocp/$VERSION/release.txt | grep 'Pull From: quay.io' | awk -F ' ' '{print $3}')

Extracting the OpenShift Container Platform installer

After retrieving the installer, the next step is to extract it.

Procedure

Set the environment variables:

$ export cmd=openshift-baremetal-install

$ export pullsecret_file=~/pull-secret.txt

$ export extract_dir=$(pwd)

Get the oc binary:

$ curl -s https://mirror.openshift.com/pub/openshift-v4/clients/ocp/$VERSION/openshift-client-linux.tar.gz | tar zxvf - oc

Extract the installer:

$ sudo cp oc /usr/local/bin

$ oc adm release extract --registry-config "${pullsecret_file}" --command=$cmd --to "${extract_dir}" ${RELEASE_IMAGE}

$ sudo cp openshift-baremetal-install /usr/local/bin

Configuring the install-config.yaml file

The install-config.yaml file requires some additional details. Most of the information is teaching the installer and the resulting cluster enough about the available IBM Cloud® hardware so that it is able to fully manage it. The material difference between installing on bare metal and installing on IBM Cloud is that you must explicitly set the privilege level for IPMI in the BMC section of the install-config.yaml file.

Procedure

Configure install-config.yaml. Change the appropriate variables to match the environment, including pullSecret and sshKey.

apiVersion: v1
baseDomain: <domain>
metadata:
  name: <cluster_name>
networking:
  machineNetwork:
  - cidr: <public-cidr>
  networkType: OVNKubernetes
compute:
- name: worker
  replicas: 2
controlPlane:
  name: master
  replicas: 3
  platform:
    baremetal: {}
platform:
  baremetal:
    apiVIP: <api_ip>
    ingressVIP: <wildcard_ip>
    provisioningNetworkInterface: <NIC1>
    provisioningNetworkCIDR: <CIDR>
    hosts:
      - name: openshift-master-0
        role: master
        bmc:
          address: ipmi://10.196.130.145?privilegelevel=OPERATOR (1)
          username: root
          password: <password>
        bootMACAddress: 00:e0:ed:6a:ca:b4 (2)
        rootDeviceHints:
          deviceName: "/dev/sda"
      - name: openshift-worker-0
        role: worker
        bmc:
          address: ipmi://<out-of-band-ip>?privilegelevel=OPERATOR (1)
          username: <user>
          password: <password>
        bootMACAddress: <NIC1_mac_address> (2)
        rootDeviceHints:
          deviceName: "/dev/sda"
pullSecret: '<pull_secret>'
sshKey: '<ssh_pub_key>'

1	The `bmc.address` provides a `privilegelevel` configuration setting with the value set to `OPERATOR`. This is required for IBM Cloud.
2	Add the MAC address of the private `provisioning` network NIC for the corresponding node.

You can use the ibmcloud command-line utility to retrieve the password.

$ ibmcloud sl hardware detail <id> --output JSON | \
  jq '"(.networkManagementIpAddress) (.remoteManagementAccounts[0].password)"'

Replace <id> with the ID of the node.

Create a directory to store the cluster configuration:
```
$ mkdir ~/clusterconfigs
```
Copy the install-config.yaml file into the directory:
```
$ cp install-config.yaml ~/clusterconfig
```
Ensure all bare metal nodes are powered off prior to installing the OpenShift Container Platform cluster:
```
$ ipmitool -I lanplus -U <user> -P <password> -H <management_server_ip> power off
```

Remove old bootstrap resources if any are left over from a previous deployment attempt:

for i in $(sudo virsh list | tail -n +3 | grep bootstrap | awk {'print $2'});
do
  sudo virsh destroy $i;
  sudo virsh undefine $i;
  sudo virsh vol-

Setting up the environment for an OpenShift Container Platform installation

Preparing the provisioner node for OpenShift Container Platform installation on IBM Cloud

Configuring the public subnet

Retrieving the OpenShift Container Platform installer

Extracting the OpenShift Container Platform installer

Configuring the install-config.yaml file