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OpenShift 4 Bare Metal Install – User Provisioned Infrastructure (UPI)

https://news.descreated.com/edukasi/2049/openshift-4-bare-metal-install-user-provisioned-infrastructure-upi/202305251630/
Thursday, May 25 2023
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OpenShift 4 Bare Metal Install – User Provisioned Infrastructure (UPI)

Architecture Diagrams

Architecture Diagrams

Download Software

  1. Download  CentOS 8 x86_64 image

  2. Login to  RedHat OpenShift Cluster Manager

  3. Select 'Create Cluster' from the 'Clusters' navigation menu

  4. Select 'RedHat OpenShift Container Platform'

  5. Select 'Run on Bare Metal'

  6. Download the following files:

    • Openshift Installer for Linux
    • Pull secret
    • Command Line Interface for Linux and your workstations OS
    • Red Hat Enterprise Linux CoreOS (RHCOS)
      • rhcos-XXX-x86_64-metal.x86_64.raw.gz
      • rhcos-XXX-x86_64-installer.x86_64.iso (or rhcos-XXX-x86_64-live.x86_64.iso for newer versions)

Prepare the 'Bare Metal' environment

VMware ESXi used in this guide

  1. Copy the CentOS 8 iso to an ESXi datastore
  2. Create a new Port Group called 'OCP' under Networking
    • (In case of VirtualBox choose “Internal Network” when creating each VM and give it the same name. ocp for instance)
    • (In case of ProxMox you may use the same network bridge and choose a specific VLAN tag. 50 for instance)
  3. Create 3 Control Plane virtual machines with minimum settings:
    • Name: ocp-cp-# (Example ocp-cp-1)
    • 4vcpu
    • 8GB RAM
    • 50GB HDD
    • The NIC is connected to the OCP network
    • Load the rhcos-XXX-x86_64-installer.x86_64.iso image into the CD/DVD drive
  4. Create 2 Worker virtual machines (or more if you want) with minimum settings:
    • Name: ocp-w-# (Example ocp-w-1)
    • 4vcpu
    • 8GB RAM
    • 50GB HDD
    • The NIC is connected to the OCP network
    • Load the rhcos-XXX-x86_64-installer.x86_64.iso image into the CD/DVD drive
  5. Create a Bootstrap virtual machine (this vm will be deleted once installation completes) with minimum settings:
    • Name: ocp-boostrap
    • 4vcpu
    • 8GB RAM
    • 50GB HDD
    • The NIC is connected to the OCP network
    • Load the rhcos-XXX-x86_64-installer.x86_64.iso image into the CD/DVD drive
  6. Create a Services virtual machine with minimum settings:
    • Name: ocp-svc
    • 4vcpu
    • 4GB RAM
    • 120GB HDD
    • NIC1 connected to the VM Network (LAN)
    • NIC2 is connected to the OCP network
    • Load the CentOS_8.iso image into the CD/DVD drive
  7. Boot all virtual machines so they each are assigned a MAC address
  8. Shut down all virtual machines except for 'ocp-svc'
  9. Use the VMware ESXi dashboard to record the MAC address of each vm, this will be used later to set static IPs

download : ocp4-metal-install-master

Configure Environmental Services

  1. Install CentOS8 on the ocp-svc host

    • Remove the home dir partition and assign all free storage to '/'
    • Optionally you can install the 'Guest Tools' package to have monitoring and reporting in the VMware ESXi dashboard
    • Enable the LAN NIC only to obtain a DHCP address from the LAN network and make note of the IP address (ocp-svc_IP_address) assigned to the vm

  2. Boot the ocp-svc VM

  3. Move the files downloaded from the RedHat Cluster Manager site to the ocp-svc node

    scp ~/Downloads/openshift-install-linux.tar.gz ~/Downloads/openshift-client-linux.tar.gz ~/Downloads/rhcos-metal.x86_64.raw.gz root@{ocp-svc_IP_address}:/root/

  4. SSH to the ocp-svc vm

    ssh root@{ocp-svc_IP_address}

  5. Extract Client tools and copy them to /usr/local/bin

    tar xvf openshift-client-linux.tar.gz
mv oc kubectl /usr/local/bin

  6. Confirm Client Tools are working

    kubectl version
oc version

  7. Extract the OpenShift Installer

    tar xvf openshift-install-linux.tar.gz

  8. Update CentOS so we get the latest packages for each of the services we are about to install

    dnf update

  9. Install Git

    dnf install git -y

  10. Download  config files  for each of the services

    git clone https://github.com/ryanhay/ocp4-metal-install

  11. OPTIONAL: Create a file '~/.vimrc' and paste the following (this helps with editing in vim, particularly yaml files):

    cat <<EOT >> ~/.vimrc
syntax on
set nu et ai sts=0 ts=2 sw=2 list hls
EOT

    Update the preferred editor

    export OC_EDITOR="vim"
export KUBE_EDITOR="vim"

  12. Set a Static IP for OCP network interface  nmtui-edit ens224 or edit /etc/sysconfig/network-scripts/ifcfg-ens224

    • Address : 192.168.22.1
    • DNS Server : 127.0.0.1
    • Search domain : ocp.lan
    • Never use this network for default route
    • Automatically connect

    If changes aren't applied automatically you can bounce the NIC with  nmcli connection down ens224 and nmcli connection up ens224

  13. Firewall setup d

    Create  internal  and  external  zones

    nmcli connection modify ens224 connection.zone internal
nmcli connection modify ens192 connection.zone external

    View zones:

    firewall-cmd --get-active-zones

    Set masquerading (source-nat) on both zones.

    So to give a quick example of source-nat – for packets leaving the external interface, which in this case is ens192 – after they have been routed they will have their source address altered to the interface address of ens192 so that returning packets can find their way back to this interface where the reverse will happen.

    firewall-cmd --zone=external --add-masquerade --permanent
firewall-cmd --zone=internal --add-masquerade --permanent

    Reload firewall config

    firewall-cmd --reload

    Check the current settings of each zone

    firewall-cmd --list-all --zone=internal
firewall-cmd --list-all --zone=external

    When masquerading is enabled so is ip forwarding which basically makes this host a router. Check:

    cat /proc/sys/net/ipv4/ip_forward

  14. Install and configure BIND DNS

    Install

    dnf install bind bind-utils -y

    Apply configuration

    \cp ~/ocp4-metal-install/dns/named.conf /etc/named.conf
cp -R ~/ocp4-metal-install/dns/zones /etc/named/

    Configure the firewall for DNS

    firewall-cmd --add-port=53/udp --zone=internal --permanent
# for OCP 4.9 and later 53/tcp is required
firewall-cmd --add-port=53/tcp --zone=internal --permanent
firewall-cmd --reload

    Enable and start the service

    systemctl enable named
systemctl start named
systemctl status named

    At the moment DNS will still be pointing to the LAN DNS server. You can see this by testing with  dig ocp.lan.

    Change the LAN nic (ens192) to use 127.0.0.1 for DNS AND ensure  Ignore automatically Obtained DNS parameters is ticked

    nmtui-edit ens192

    Restart Network Manager

    systemctl restart NetworkManager

    Confirm dig now sees the correct DNS results by using the DNS Server running locally

    dig ocp.lan
# The following should return the answer ocp-bootstrap.lab.ocp.lan from the local server
dig -x 192.168.22.200

  15. Install & configure DHCP

    Install the DHCP Server

    dnf install dhcp-server -y

    Edit dhcpd.conf from the cloned git repo to have the correct mac address for each host and copy the conf file to the correct location for the DHCP service to use

    \cp ~/ocp4-metal-install/dhcpd.conf /etc/dhcp/dhcpd.conf

    Configure the Firewall

    firewall-cmd --add-service=dhcp --zone=internal --permanent
firewall-cmd --reload

    Enable and start the service

    systemctl enable dhcpd
systemctl start dhcpd
systemctl status dhcpd

  16. Install & configure Apache Web Server

    Install Apache

    dnf install httpd -y

    Change default listen port to 8080 in httpd.conf

    sed -i 's/Listen 80/Listen 0.0.0.0:8080/' /etc/httpd/conf/httpd.conf

    Configure the firewall for Web Server traffic

    firewall-cmd --add-port=8080/tcp --zone=internal --permanent
firewall-cmd --reload

    Enable and start the service

    systemctl enable httpd
systemctl start httpd
systemctl status httpd

    Making a GET request to localhost on port 8080 should now return the default Apache webpage

    curl localhost:8080

  17. Install & configure HAProxy

    Install HAProxy

    dnf install haproxy -y

    Copy HAProxy config

    \cp ~/ocp4-metal-install/haproxy.cfg /etc/haproxy/haproxy.cfg

    Configure the Firewall

    Note: Opening port 9000 in the external zone allows access to HAProxy statistics that are useful for monitoring and troubleshooting. The UI can be accessed at: http://{ocp-svc_IP_address}:9000/stats

    firewall-cmd --add-port=6443/tcp --zone=internal --permanent # kube-api-server on control plane nodes
firewall-cmd --add-port=6443/tcp --zone=external --permanent # kube-api-server on control plane nodes
firewall-cmd --add-port=22623/tcp --zone=internal --permanent # machine-config server
firewall-cmd --add-service=http --zone=internal --permanent # web services hosted on worker nodes
firewall-cmd --add-service=http --zone=external --permanent # web services hosted on worker nodes
firewall-cmd --add-service=https --zone=internal --permanent # web services hosted on worker nodes
firewall-cmd --add-service=https --zone=external --permanent # web services hosted on worker nodes
firewall-cmd --add-port=9000/tcp --zone=external --permanent # HAProxy Stats
firewall-cmd --reload

    Enable and start the service

    setsebool -P haproxy_connect_any 1 # SELinux name_bind access
systemctl enable haproxy
systemctl start haproxy
systemctl status haproxy

  18. Install and configure NFS for the OpenShift Registry. It is a requirement to provide storage for the Registry, emptyDir can be specified if necessary.

    Install NFS Server

    dnf install nfs-utils -y

    Create the Share

    Check available disk space and its location df -h

    mkdir -p /shares/registry
chown -R nobody:nobody /shares/registry
chmod -R 777 /shares/registry

    Export the Share

    echo "/shares/registry  192.168.22.0/24(rw,sync,root_squash,no_subtree_check,no_wdelay)" > /etc/exports
exportfs -rv

    Set Firewall rules:

    firewall-cmd --zone=internal --add-service mountd --permanent
firewall-cmd --zone=internal --add-service rpc-bind --permanent
firewall-cmd --zone=internal --add-service nfs --permanent
firewall-cmd --reload

    Enable and start the NFS related services

    systemctl enable nfs-server rpcbind
systemctl start nfs-server rpcbind nfs-mountd

Generate and host install files

  1. Generate an SSH key pair keeping all default options

    ssh-keygen

  2. Create an install directory

    mkdir ~/ocp-install

  3. Copy the install-config.yaml included in the clones repository to the install directory

    cp ~/ocp4-metal-install/install-config.yaml ~/ocp-install

  4. Update the install-config.yaml with your own pull-secret and ssh key.

    • Line 23 should contain the contents of your pull-secret.txt
    • Line 24 should contain the contents of your '~/.ssh/id_rsa.pub'
    vim ~/ocp-install/install-config.yaml

  5. Generate Kubernetes manifest files

    ~/openshift-install create manifests --dir ~/ocp-install

    A warning is shown about making the control plane nodes scheduled. It is up to you if you want to run workloads on the Control Plane nodes. If you don't want to you can disable this with:  sed -i 's/mastersSchedulable: true/mastersSchedulable: false/' ~/ocp-install/manifests/cluster-scheduler-02-config.yml. Make any other custom changes you like to the core Kubernetes manifest files.

    Generate the Ignition config and Kubernetes auth files

    ~/openshift-install create ignition-configs --dir ~/ocp-install/

  6. Create a hosting directory to serve the configuration files for the OpenShift boot process

    mkdir /var/www/html/ocp4

  7. Copy all generated install files to the new web server directory

    cp -R ~/ocp-install/* /var/www/html/ocp4

  8. Move the Core OS image to the web server directory (later you need to type this path multiple times so it is a good idea to shorten the name)

    mv ~/rhcos-X.X.X-x86_64-metal.x86_64.raw.gz /var/www/html/ocp4/rhcos

  9. Change ownership and permissions of the web server directory

    chcon -R -t httpd_sys_content_t /var/www/html/ocp4/
chown -R apache: /var/www/html/ocp4/
chmod 755 /var/www/html/ocp4/

  10. Confirm you can see all files added to the  /var/www/html/ocp4/ dir through Apache

    curl localhost:8080/ocp4/

Deploy OpenShift

  1. Power on the ocp-bootstrap host and ocp-cp-# hosts and select 'Tab' to enter boot configuration. Enter the following configuration:

    # Bootstrap Node - ocp-bootstrap
coreos.inst.install_dev=sda coreos.inst.image_url=http://192.168.22.1:8080/ocp4/rhcos coreos.inst.insecure=yes coreos.inst.ignition_url=http://192.168.22.1:8080/ocp4/bootstrap.ign

# Or if you waited for it boot, use the following command then just reboot after it finishes and make sure you remove the attached .iso
sudo coreos-installer install /dev/sda -u http://192.168.22.1:8080/ocp4/rhcos -I http://192.168.22.1:8080/ocp4/bootstrap.ign --insecure --insecure-ignition

# Or bootstrap
sudo coreos-installer install /dev/sda --insecure --image-url http://192.168.110.215:8080/ocp4/rhcos --ignition-url http://192.168.110.215:8080/ocp4/bootstrap.ign --insecure-ignition
    # Each of the Control Plane Nodes - ocp-cp-\#
coreos.inst.install_dev=sda coreos.inst.image_url=http://192.168.22.1:8080/ocp4/rhcos coreos.inst.insecure=yes coreos.inst.ignition_url=http://192.168.22.1:8080/ocp4/master.ign

# Or if you waited for it boot, use the following command then just reboot after it finishes and make sure you remove the attached .iso
sudo coreos-installer install /dev/sda -u http://192.168.22.1:8080/ocp4/rhcos -I http://192.168.22.1:8080/ocp4/master.ign --insecure --insecure-ignition

# Or Control Plane
sudo coreos-installer install /dev/sda --insecure --image-url http://192.168.110.215:8080/ocp4/rhcos --ignition-url http://192.168.110.215:8080/ocp4/master.ign --insecure-ignition

  2. Power on the ocp-w-# hosts and select 'Tab' to enter boot configuration. Enter the following configuration:

    # Each of the Worker Nodes - ocp-w-\#
coreos.inst.install_dev=sda coreos.inst.image_url=http://192.168.22.1:8080/ocp4/rhcos coreos.inst.insecure=yes coreos.inst.ignition_url=http://192.168.22.1:8080/ocp4/worker.ign

# Or if you waited for it boot, use the following command then just reboot after it finishes and make sure you remove the attached .iso
sudo coreos-installer install /dev/sda -u http://192.168.22.1:8080/ocp4/rhcos -I http://192.168.22.1:8080/ocp4/worker.ign --insecure --insecure-ignition
# Or Worker 
$ sudo coreos-installer install /dev/sda --insecure --image-url http://192.168.22.1:8080/ocp4/rhcos --ignition-url http://192.168.22.1:8080/ocp4/worker.ign --insecure-ignition

Monitor the Bootstrap Process

  1. You can monitor the bootstrap process from the ocp-svc host at different log levels (debug, error, info)

    ~/openshift-install --dir ~/ocp-install wait-for bootstrap-complete --log-level=debug

  2. Once bootstrapping is complete the ocp-boostrap node  can be removed

Remove the Bootstrap Node

  1. Remove all references to the  ocp-bootstrap host from the  /etc/haproxy/haproxy.cfg file

    # Two entries
vim /etc/haproxy/haproxy.cfg
# Restart HAProxy - If you are still watching HAProxy stats console you will see that the ocp-boostrap host has been removed from the backends.
systemctl reload haproxy

  2. The ocp-bootstrap host can now be safely shutdown and deleted from the VMware ESXi Console, the host is no longer required

Wait for installation to complete

IMPORTANT: if you set mastersSchedulable to false the  worker nodes will need to be joined to the cluster  to complete the installation. This is because the OpenShift Router will need to be scheduled on the worker nodes and it is a dependency for cluster operators such as ingress, console and authentication.

  1. Collect the OpenShift Console address and kubeadmin credentials from the output of the install-complete event

    ~/openshift-install --dir ~/ocp-install wait-for install-complete

  2. Continue to join the worker nodes to the cluster in a new tab while waiting for the above command to complete

Join Worker Nodes

  1. Setup 'oc' and 'kubectl' clients on the ocp-svc machine

    export KUBECONFIG=~/ocp-install/auth/kubeconfig
# Test auth by viewing cluster nodes
oc get nodes

  2. View and approve pending CSRs

    Note: Once you approve the first set of CSRs additional 'kubelet-serving' CSRs will be created. These must be approved too. If you don't see pending requests wait until you do.

    # View CSRs
oc get csr
# Approve all pending CSRs
oc get csr -o go-template='{{range .items}}{{if not .status}}{{.metadata.name}}{{"\n"}}{{end}}{{end}}' | xargs oc adm certificate approve
# Wait for kubelet-serving CSRs and approve them too with the same command
oc get csr -o go-template='{{range .items}}{{if not .status}}{{.metadata.name}}{{"\n"}}{{end}}{{end}}' | xargs oc adm certificate approve

  3. Watch and wait for the Worker Nodes to join the cluster and enter a 'Ready' status

    This can take 5-10 minutes

    watch -n5 oc get nodes

Configure storage for the Image Registry

A Bare Metal cluster does not by default provide storage so the Image Registry Operator bootstraps itself as 'Removed' so the installer can complete. As the installation has now completed storage can be added for the Registry and the operator updated to a 'Managed' state.

  1. Create the 'image-registry-storage' PVC by updating the Image Registry operator config by updating the management state to 'Managed' and adding 'pvc' and 'claim' keys in the storage key:

    oc edit configs.imageregistry.operator.openshift.io
    managementState: Managed
    storage:
  pvc:
    claim: # leave the claim blank

  2. Confirm the 'image-registry-storage' pvc has been created and is currently in a 'Pending' state

    oc get pvc -n openshift-image-registry

  3. Create the persistent volume for the 'image-registry-storage' pvc to bind to

    oc create -f ~/ocp4-metal-install/manifest/registry-pv.yaml

  4. After a short wait the 'image-registry-storage' pvc should now be bound

    oc get pvc -n openshift-image-registry

Create the first Admin user

  1. Apply the  oauth-htpasswd.yaml file to the cluster

    This will create a user 'admin' with the password 'password'. To set a different username and password substitute the htpasswd key in the '~/ocp4-metal-install/manifest/oauth-htpasswd.yaml' file with the output of htpasswd -n -B -b <username> <password>

    oc apply -f ~/ocp4-metal-install/manifest/oauth-htpasswd.yaml

  2. Assign the new user (admin) admin permissions

    oc adm policy add-cluster-role-to-user cluster-admin admin

Access the OpenShift Console

  1. Wait for the 'console' Cluster Operator to become available

    oc get co

  2. Append the following to your local workstations  /etc/hosts file:

    From your local workstation If you do not want to add an entry for each new service made available on OpenShift you can configure the ocp-svc DNS server to serve externally and create a wildcard entry for *.apps.lab.ocp.lan

    # Open the hosts file
sudo vi /etc/hosts

# Append the following entries:
192.168.0.96 ocp-svc api.lab.ocp.lan console-openshift-console.apps.lab.ocp.lan oauth-openshift.apps.lab.ocp.lan downloads-openshift-console.apps.lab.ocp.lan alertmanager-main-openshift-monitoring.apps.lab.ocp.lan grafana-openshift-monitoring.apps.lab.ocp.lan prometheus-k8s-openshift-monitoring.apps.lab.ocp.lan thanos-querier-openshift-monitoring.apps.lab.ocp.lan

  3. Navigate to the  OpenShift Console URL  and log in as the 'admin' user

    You will get self certificate signed warnings that you can ignore If you need to login as kubeadmin and need to the password again you can retrieve it with: cat ~/ocp-install/auth/kubeadmin-password

Troubleshooting

  1. You can collect logs from all cluster hosts by running the following command from the 'ocp-svc' host:

    ./openshift-install gather bootstrap --dir ocp-install --bootstrap=192.168.22.200 --master=192.168.22.201 --master=192.168.22.202 --master=192.168.22.203

  2. Modify the role of the Control Plane Nodes

    If you would like to schedule workloads on the Control Plane nodes apply the 'worker' role by changing the value of 'mastersSchedulable' to true.

    If you do not want to schedule workloads on the Control Plane nodes remove the 'worker' role by changing the value of 'mastersSchedulable' to false.

    Remember depending on where you host your workloads you will have to update HAProxy to include or exclude the control plane nodes from the ingress backends.

    oc edit schedulers.config.openshift.io cluster
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