Merge pull request #201170 from mathapli/master

Adding EUS to NON EUS process

Author: Maggiemouse1

articles/virtual-machines/workloads/redhat/redhat-rhui.md

@@ -84,6 +84,117 @@ At the time of this writing, EUS support has ended for RHEL <= 7.4. See the "Red
 * RHEL 7.6 EUS support ends May 31, 2021
 * RHEL 7.7 EUS support ends August 30, 2021
 
+### Switch a RHEL VM 7.x to EUS (version-lock to a specific minor version)
+Use the following instructions to lock a RHEL 7.x VM to a particular minor release (run as root):
+
+>[!NOTE]
+> This only applies for RHEL 7.x versions for which EUS is available. At the time of this writing, this includes RHEL 7.2-7.7. More details are available at the [Red Hat Enterprise Linux Life Cycle](https://access.redhat.com/support/policy/updates/errata) page.
+1. Disable non-EUS repos:
+    ```bash
+    yum --disablerepo='*' remove 'rhui-azure-rhel7'
+    ```
+
+1. Add EUS repos:
+    ```bash
+    yum --config='https://rhelimage.blob.core.windows.net/repositories/rhui-microsoft-azure-rhel7-eus.config' install 'rhui-azure-rhel7-eus'
+    ```
+
+1. Lock the `releasever` variable (run as root):
+    ```bash
+    echo $(. /etc/os-release && echo $VERSION_ID) > /etc/yum/vars/releasever
+    ```
+
+    >[!NOTE]
+    > The above instruction will lock the RHEL minor release to the current minor release. Enter a specific minor release if you are looking to upgrade and lock to a later minor release that is not the latest. For example, `echo 7.5 > /etc/yum/vars/releasever` will lock your RHEL version to RHEL 7.5.
+1. Update your RHEL VM
+    ```bash
+    sudo yum update
+    ```
+
+### Switch a RHEL VM 8.x to EUS (version-lock to a specific minor version)
+Use the following instructions to lock a RHEL 8.x VM to a particular minor release (run as root):
+
+>[!NOTE]
+> This only applies for RHEL 8.x versions for which EUS is available. At the time of this writing, this includes RHEL 8.1-8.2. More details are available at the [Red Hat Enterprise Linux Life Cycle](https://access.redhat.com/support/policy/updates/errata) page.
+1. Disable non-EUS repos:
+    ```bash
+    yum --disablerepo='*' remove 'rhui-azure-rhel8'
+    ```
+
+1. Get the EUS repos config file:
+    ```bash
+    wget https://rhelimage.blob.core.windows.net/repositories/rhui-microsoft-azure-rhel8-eus.config
+    ```
+
+1. Add EUS repos:
+    ```bash
+    yum --config=rhui-microsoft-azure-rhel8-eus.config install rhui-azure-rhel8-eus
+    ```
+
+1. Lock the `releasever` variable (run as root):
+    ```bash
+    echo $(. /etc/os-release && echo $VERSION_ID) > /etc/yum/vars/releasever
+    ```
+
+    >[!NOTE]
+    > The above instruction will lock the RHEL minor release to the current minor release. Enter a specific minor release if you are looking to upgrade and lock to a later minor release that is not the latest. For example, `echo 8.1 > /etc/yum/vars/releasever` will lock your RHEL version to RHEL 8.1.
+    >[!NOTE]
+    > If there are permission issues to access the releasever, you can edit the file using 'nano /etc/yum/vars/releaseve' and add the image version details and save ('Ctrl+o' then press enter and then 'Ctrl+x').  
+1. Update your RHEL VM
+    ```bash
+    sudo yum update
+    ```
+
+
+### Switch a RHEL 7.x VM back to non-EUS (remove a version lock)
+Run the following as root:
+1. Remove the `releasever` file:
+    ```bash
+    rm /etc/yum/vars/releasever
+     ```
+
+1. Disable EUS repos:
+    ```bash
+    yum --disablerepo='*' remove 'rhui-azure-rhel7-eus'
+   ```
+
+1. Configure RHEL VM
+    ```bash
+    yum --config='https://rhelimage.blob.core.windows.net/repositories/rhui-microsoft-azure-rhel7.config' install 'rhui-azure-rhel7'
+    ```
+
+1. Update your RHEL VM
+    ```bash
+    sudo yum update
+    ```
+
+### Switch a RHEL 8.x VM back to non-EUS (remove a version lock)
+Run the following as root:
+1. Remove the `releasever` file:
+    ```bash
+    rm /etc/yum/vars/releasever
+     ```
+
+1. Disable EUS repos:
+    ```bash
+    yum --disablerepo='*' remove 'rhui-azure-rhel8-eus'
+   ```
+
+1. Get the regular repos config file:
+    ```bash
+    wget https://rhelimage.blob.core.windows.net/repositories/rhui-microsoft-azure-rhel8.config
+    ```
+
+1. Add non-EUS repos:
+    ```bash
+    yum --config=rhui-microsoft-azure-rhel8.config install rhui-azure-rhel8
+    ```
+
+1. Update your RHEL VM
+    ```bash
+    sudo yum update
+    ```
+
 ## The IPs for the RHUI content delivery servers
 
 RHUI is available in all regions where RHEL on-demand images are available. It currently includes all public regions listed on the [Azure status dashboard](https://azure.microsoft.com/status/) page, Azure US Government, and Microsoft Azure Germany regions.