Add docs for updating ospool-ep docker image

Author: mwestphall

docs/release/updating-to-osg-24.md

@@ -0,0 +1,50 @@
+title: Updating to OSG 24
+
+Updating to OSG 24
+==================
+
+[OSG 24](release_series.md#series-overviews) (the *new series*) introduces support for the ARM architecture. Changes
+required to upgrade from OSG 23 are relatively minor.
+
+Updating Docker-based EP Deployments
+-----------------------------
+
+In OSG 24, the `opensciencegrid/osgvo-docker-pilot` worker node docker image has been renamed to `osg-htc/ospool-ep`.
+To upgrade your docker-based worker nodes from OSG 23 to OSG 24, follow the sections below:
+
+#### Via Docker Run ####
+
+For sites running the container [directly via docker](../resource-sharing/os-backfill-containers.md#running-the-container-with-docker),
+the EP container can be updated by changing the image name referenced in the `docker run` command. All other arguments to the 
+`docker run` command may remain the same. 
+
+```console
+root@host # docker run <existing docker args> hub.opensciencegrid.org/osg-htc/ospool-ep:24-release
+```
+
+#### Via RPM ####
+
+For sites running the ep container [via rpm installation](../resource-sharing/os-backfill-containers.md#running-the-container-via-rpm),
+the container can be upgraded by updating the RPM.
+
+1. [Install](../common/yum.md#install-the-osg-repositories) the new OSG release series RPMs.
+
+    - OSG 24 EL9:
+
+            :::console
+            root@host # yum install https://repo.opensciencegrid.org/osg/24-main/osg-24-main-el9-release-latest.rpm
+
+    - OSG 24 EL8:
+
+            :::console
+            root@host # yum install https://repo.opensciencegrid.org/osg/24-main/osg-24-main-el8-release-latest.rpm
+
+2. Upgrade the `ospool-ep` rpm:
+
+       :::console
+       root@host # yum install ospool-ep
+
+3. Restart the ospool-ep systemctl service:
+
+       :::console
+       root@host # systemctl restart ospool-ep