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Deployment Guide—Dell EMC Ready Stack for Red Hat OpenShift Container Platform 4.3
Setting Up the CSAH Node
Introduction Preparing the CSAH node Preparing and running Ansible playbooks

Preparing the CSAH node

  • To install Red Hat 7.6 in the CSAH node:

    1. Follow the guidelines in the Red Hat Enterprise Linux 7 Installation Guide.

    In the Red Hat UI, ensure that, under Software Selection, Server with GUI is selected, as shown in the following figure:

    Figure 1.         Operating system installation options in UI

    1. After the installation is complete, perform the following tasks as user root unless specified otherwise:
      1. Set the hostname to reflect the naming standards:

     [root@csah ~]# hostnamectl set-hostname <hostname>.<base domain>

    [root@csah ~]# hostnamectl set-hostname csah.example.com

    1. Create a bonded interface, add slaves to it, and then assign an IP address to the bonded interface.

    As part of our validation, we created bond0 using 100 Gb NIC ports in slot 2 (p2p1 and p2p2):

    # Create bond0 interface

    [root@csah ~]# nmcli connection add type bond con-name bond0 ifname bond0 bond.options "lacp_rate=1,miimon=100,mode=802.3ad,xmit_hash_policy=layer3+4"

    # Add slaves to bond0 interface

    [root@csah ~]# nmcli con add type ethernet ifname p2p1 master bond0

    [root@csah ~]# nmcli con add type ethernet ifname p2p2 master bond0

    # Set IP Address to bond0 interface

    [root@csah ~]# nmcli connection modify bond0 ipv4.method manual ipv4.address <ipaddress/cidr> connection.autoconnect yes ipv4.gateway <gateway> ipv4.dns <dns-server> ipv4.dns-search <base domain>

    ex: nmcli connection modify bond0 ipv4.method manual ipv4.addresses 100.82.46.20/26 connection.autoconnect yes ipv4.gateway 100.82.46.1 ipv4.dns 100.82.32.10 ipv4.dns-search example.com

    # Bring up bond0 interface

    [root@csah ~]# nmcli connection up bond0

    Note: Check the /proc/net/bonding/bond0 file and ensure that the slave interfaces (p2p1 and p2p2) are listed along with the bonding configuration.

    Note: The assigned IP address must be able to reach the Internet, and the DNS must be able to resolve subscription.rhsm.redhat.com.

    1. Add the newly created hostname in the /etc/hosts file together with its IP address, as shown in the following output:

    100.82.46.20  csah  csah.example.com

    1. Enable the rhel-7-server-ansible-2.9-rpms repository using subscription-manager:

    [root@csah ~]# subscription-manager register --username <subscription.user> --password <subscription.password> --force

    [root@csah ~]# subscription-manager attach --pool=<pool id>

    [root@csah ~]# subscription-manager repos --enable= rhel-7-server-ansible-2.9-rpms

    1. Install the following RPMs:

    [root@csah ~]# yum install -y git ansible

    1. Create a user to run playbooks.

    Note: Do not use the username core. User core is used as part of the OpenShift Container Platform cluster setup and is a predefined user in CoreOS.

    [root@csah ~]# useradd <user>

    Note: The remainder of this guide assumes that user ansible is created to run playbooks.

    1. As user ansible, set up passwordless access to the CSAH FQDN:

    [ansible@csah ~]$ ssh-keygen (press enter and go by defaults for the next set of questions)

    [ansible@csah ~]$ cat .ssh/id_rsa.pub > .ssh/authorized_keys

    [ansible@csah ~]$ chmod 600 .ssh/authorized_keys

    1. As user root, provide permissions to the user that you just created (ansible in our example) to run all commands without being prompted for a password:

    visudo

    # add the following line after # %wheel ALL=(ALL) NOPASSWD: ALL

    ansible ALL=(ALL) NOPASSWD: ALL

    1. Download the Ansible playbooks from GitHub:

    [ansible@csah ~]$ git clone https://github.com/dell-esg/openshift-bare-metal.git

next

Preparing and running Ansible playbooks