RHEL

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Postinstall

Subscription

After installing RHEL, we cannot use yum just yet:

This system is not yet registered.

We have to register the system first:

$ subscription-manager register
Registering to: subscription.rhsm.redhat.com:443/subscription
Username: xxxx
Password:
The system has been registered with ID: eed6c0d8-da03-4349-9cf8-d8c2c994e558

But we're not quite there yet, as we don't have any active subscriptions yet:

$ subscription-manager list
+-------------------------------------------+
    Installed Product Status
+-------------------------------------------+
Product Name:   Red Hat Enterprise Linux Server
Product ID:     69 
Version:        7.4 Beta
Arch:           x86_64
Status:         Not Subscribed
Status Details: Not supported by a valid subscription.
Starts:
Ends:

$ yum search iotop
Loaded plugins: product-id, search-disabled-repos, subscription-manager
This system is registered with an entitlement server, but is not receiving updates. 
You can use subscription-manager to assign subscriptions.
Warning: No matches found for: iotop

Subscribe with:

$ subscription-manager attach
Installed Product Current Status:
Product Name: Red Hat Enterprise Linux Server
Status:       Subscribed

Now that we're subscribed, we can actually install software.

Network

 root@rhel0# cat /etc/sysconfig/network-scripts/ifcfg-eth0 
 BOOTPROTO=dhcp
 DEVICE=eth0
 ONBOOT=yes
 HWADDR=08:00:27:EE:55:CF
 NM_CONTROLLED=no
 
 root@rhel0# cat /etc/sysconfig/network
 NETWORKING=yes
 HOSTNAME=rhel0
 
 root@rhel0# service network restart

Upgrade

In-Place upgrades were not supported in earlier versions[1] and while a clean install is still the recommended way of upgrading[2] an In-Place upgrade is now possible and supported on some platforms.[3]

TBD

References