Add OSG 24 upgrade documentation

docs/common/yum.md

@@ -147,7 +147,7 @@ You must install and enable these first.
 
 This document assumes a fresh install.
 For instructions on upgrading from one OSG series to another, see the
-[release series document](../release/updating-to-osg-36.md).
+[release series document](../release/updating-to-osg-24.md).
 
 1. Install the OSG repository for your OS version and the [OSG release series](../release/release_series.md) that you wish to
    use:

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

@@ -6,6 +6,61 @@ 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.
 
+-   [Compute Entrypoints](../compute-element/htcondor-ce-overview.md) should be updated to OSG 24 as soon as possible.
+
+-   [HTCondor pools](#updating-your-htcondor-hosts) and [access points](#updating-your-osg-access-point) should be
+    updated to OSG 24 as soon as possible.
+
+-   All other services (e.g., OSG Worker Node clients, Frontier Squids) should be updated to
+    [OSG 24](#updating-the-osg-repositories) as soon as possible.
+
+Updating the OSG Repositories
+-----------------------------
+
+!!! note
+    Before updating the OSG repository, be sure to turn off any OSG services. Consult the sections below
+    that match your situation.
+
+1.  Clean the yum cache:
+
+        :::console
+        root@host # yum clean all --enablerepo=*
+
+1.  Disable to upcoming repository:
+
+        :::console
+        yum-config-manager --disable osg-upcoming
+
+1.  Remove the old series Yum repositories:
+
+        :::console
+        root@host # rpm -e osg-release
+
+    This step ensures that any local modifications to `*.repo` files will not prevent installing the new series repos.
+    Any modified `*.repo` files should appear under `/etc/yum.repos.d/` with the `*.rpmsave` extension.
+    After installing the new OSG repositories (the next step) you may want to apply any changes made in the `*.rpmsave`
+    files to the new `*.repo` files.
+
+1.  Update your [Yum repositories](../common/yum.md#install-the-osg-repositories) to OSG 24
+
+1.  Update software:
+
+        :::console
+        root@host # yum update
+
+    !!! warning
+        -   Please be aware that running `yum update` may also update other RPMs.
+            You can exclude packages from being updated using the `--exclude=[package-name or glob]` option for the
+            `yum` command.
+        -   Watch the yum update carefully for any messages about a `.rpmnew` file being created.
+            That means that a configuration file had been edited, and a new default version was to be installed.
+            In that case, RPM does not overwrite the edited configuration file but instead installs the new version with
+            a `.rpmnew` extension.
+            You will need to merge any edits that have made into the `.rpmnew` file and then move the merged version
+            into place (that is, without the `.rpmnew` extension).
+
+1.  Continue on to any update instructions that match the role(s) that the host performs.
+
 Updating Container-based OSPool EP Deployments
 -----------------------------
 
@@ -42,3 +97,94 @@ the container can be upgraded by updating the RPM.
 
         :::console
         root@host # systemctl restart ospool-ep
+
+Updating Your OSG Access Point
+------------------------------
+
+In OSG 23, some manual configuration changes may be required for an OSG Access Point (APs).
+
+#### HTCondor ####
+
+Consult the [HTCondor upgrade section](#updating-your-htcondor-hosts) for details on updating your HTCondor configuration.
+
+### Restarting HTCondor ###
+
+After updating your RPMs, restart your HTCondor service:
+
+```console
+root@host # systemctl restart condor
+```
+
+Updating Your OSG Compute Entrypoint
+------------------------------------
+
+The OSG 24 release series contains [HTCondor-CE 24](https://htcondor.github.io/htcondor-ce/v24/releases/).
+HTCondor-CE 24 no longer accepts the original job router syntax.
+If you have custom job routes, you must be using the new, more flexible,
+[ClassAd transform](https://htcondor.com/htcondor-ce/v24/configuration/job-router-overview/#classad-transforms)
+job router syntax.
+
+To upgrade your CE to OSG 24, follow the sections below.
+
+### Check for possible incompatibilities ###
+
+1.  Ensure that you have the latest HTCondor installed (at least HTCondor 23.10.2 or HTCondor 23.0.17).
+
+1.  Run the `condor_ce_upgrade_check` script and address any issues found.
+
+1.  If you have added custom job routes, make sure that you
+    [convert](https://htcondor.com/htcondor-ce/v23/configuration/job-router-overview/#converting-to-classad-transforms)
+    any jobs routes to the new, more flexible,
+    [ClassAd transform](https://htcondor.com/htcondor-ce/v24/configuration/job-router-overview/#classad-transforms)
+    syntax.
+
+1.  If you have an HTCondor batch system, also run the `condor_upgrade_check` script and address any issues found.
+
+1.  Also consult the [upgrade documentation](https://htcondor.github.io/htcondor-ce/v24/releases/#updating-to-htcondor-ce-24)
+    for more information.
+
+### Turning off CE services ###
+
+1.  Register a [downtime](../common/registration.md#registering-resource-downtimes)
+
+1.  During the update, turn off the following services on your HTCondor-CE host:
+
+        :::console
+        root@host # systemctl stop condor-ce
+
+### Updating CE packages ###
+
+!!! note "For OSG CEs serving an HTCondor pool"
+    If your OSG CE routes pilot jobs to a local HTCondor pool, also
+    see the section for [updating your HTCondor hosts](#updating-your-htcondor-hosts)
+
+After turning off your CE's services, you may proceed with the [repository and RPM update process](#updating-the-osg-repositories).
+
+### Starting CE services ###
+
+After updating your RPMs and updating your configuration, turn on the HTCondor-CE service:
+
+    :::console
+    root@host # systemctl start condor-ce
+
+Updating Your HTCondor Hosts
+----------------------------
+
+!!! warning "HTCondor-CE hosts"
+    Consult [this section](#updating-your-osg-compute-entrypoint) before updating the `condor` package on your
+    HTCondor-CE hosts.
+
+If you are running an HTCondor pool, consult the following instructions to update to HTCondor from OSG 23.
+
+1.  Ensure that you have the latest HTCondor installed (at least HTCondor 23.10.2 or HTCondor 23.0.17).
+
+1.  Run the `condor_upgrade_check` script and address any issues found.
+
+1.  Also consult the [HTCondor 24.0 upgrade instructions](https://htcondor.readthedocs.io/en/24.0/version-history/upgrading-from-23-0-to-24-0-versions.html).
+
+You may proceed with the [repository and RPM update process](#updating-the-osg-repositories).
+
+Getting Help
+------------
+
+To get assistance, please use the [this page](../common/help.md).