diff --git a/.ansible-lint b/.ansible-lint
index 8ff1ec7e..73cc1507 100644
--- a/.ansible-lint
+++ b/.ansible-lint
@@ -22,3 +22,5 @@ exclude_paths:
   - examples/roles/
 mock_roles:
   - linux-system-roles.ha_cluster
+mock_modules:
+  - ansible.utils.update_fact
diff --git a/.ostree/README.md b/.ostree/README.md
new file mode 100644
index 00000000..f5e6931b
--- /dev/null
+++ b/.ostree/README.md
@@ -0,0 +1,3 @@
+*NOTE*: The `*.txt` files are used by `get_ostree_data.sh` to create the lists
+of packages, and to find other system roles used by this role.  DO NOT use them
+directly.
diff --git a/.ostree/get_ostree_data.sh b/.ostree/get_ostree_data.sh
new file mode 100755
index 00000000..7c325241
--- /dev/null
+++ b/.ostree/get_ostree_data.sh
@@ -0,0 +1,123 @@
+#!/bin/bash
+
+set -euo pipefail
+
+role_collection_dir="${ROLE_COLLECTION_DIR:-fedora/linux_system_roles}"
+ostree_dir="${OSTREE_DIR:-"$(dirname "$(realpath "$0")")"}"
+
+if [ -z "${4:-}" ] || [ "${1:-}" = help ] || [ "${1:-}" = -h ]; then
+    cat <<EOF
+Usage: $0 packages [runtime|testing] DISTRO-MAJOR[.MINOR] [json|yaml|raw|toml]
+The script will use the packages and roles files in $ostree_dir to
+construct the list of packages needed to build the ostree image.  The script
+will output the list of packages in the given format
+- json is a JSON list like ["pkg1","pkg2",....,"pkgN"]
+- yaml is the YAML list format
+- raw is the list of packages, one per line
+- toml is a list of [[packages]] elements as in https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html-single/composing_installing_and_managing_rhel_for_edge_images/index#creating-an-image-builder-blueprint-for-a-rhel-for-edge-image-using-the-command-line-interface_composing-a-rhel-for-edge-image-using-image-builder-command-line
+The DISTRO-MAJOR.MINOR is the same format used by Ansible for distribution e.g. CentOS-8, RedHat-8.9, etc.
+EOF
+    exit 1
+fi
+category="$1"
+pkgtype="$2"
+distro_ver="$3"
+format="$4"
+pkgtypes=("$pkgtype")
+if [ "$pkgtype" = testing ]; then
+    pkgtypes+=(runtime)
+fi
+
+get_rolepath() {
+    local ostree_dir role rolesdir roles_parent_dir
+    ostree_dir="$1"
+    role="$2"
+    roles_parent_dir="$(dirname "$(dirname "$ostree_dir")")"
+    rolesdir="$roles_parent_dir/$role/.ostree"
+    # assumes collection format
+    if [ -d "$rolesdir" ]; then
+        echo "$rolesdir"
+        return 0
+    fi
+    # assumes legacy role format like linux-system-roles.$role/
+    for rolesdir in "$roles_parent_dir"/*-system-roles."$role"/.ostree; do
+        if [ -d "$rolesdir" ]; then
+          echo "$rolesdir"
+          return 0
+        fi
+    done
+    # look elsewhere
+    if [ -n "${ANSIBLE_COLLECTIONS_PATHS:-}" ]; then
+        for pth in ${ANSIBLE_COLLECTIONS_PATHS//:/ }; do
+            rolesdir="$pth/ansible_collections/$role_collection_dir/roles/$role/.ostree"
+            if [ -d "$rolesdir" ]; then
+                echo "$rolesdir"
+                return 0
+            fi
+        done
+    fi
+    return 1
+}
+
+get_packages() {
+    local ostree_dir pkgtype pkgfile rolefile
+    ostree_dir="$1"
+    for pkgtype in "${pkgtypes[@]}"; do
+        for suff in "" "-$distro" "-${distro}-${major_ver}" "-${distro}-${ver}"; do
+            pkgfile="$ostree_dir/packages-${pkgtype}${suff}.txt"
+            if [ -f "$pkgfile" ]; then
+                cat "$pkgfile"
+            fi
+        done
+        rolefile="$ostree_dir/roles-${pkgtype}.txt"
+        if [ -f "$rolefile" ]; then
+            local roles role rolepath
+            roles="$(cat "$rolefile")"
+            for role in $roles; do
+                rolepath="$(get_rolepath "$ostree_dir" "$role")"
+                get_packages "$rolepath"
+            done
+        fi
+    done | sort -u
+}
+
+format_packages_json() {
+    local comma pkgs pkg
+    comma=""
+    pkgs="["
+    while read -r pkg; do
+        pkgs="${pkgs}${comma}\"${pkg}\""
+        comma=,
+    done
+    pkgs="${pkgs}]"
+    echo "$pkgs"
+}
+
+format_packages_raw() {
+    cat
+}
+
+format_packages_yaml() {
+    while read -r pkg; do
+        echo "- $pkg"
+    done
+}
+
+format_packages_toml() {
+    while read -r pkg; do
+        echo "[[packages]]"
+        echo "name = \"$pkg\""
+        echo "version = \"*\""
+    done
+}
+
+distro="${distro_ver%%-*}"
+ver="${distro_ver##*-}"
+if [[ "$ver" =~ ^([0-9]*) ]]; then
+    major_ver="${BASH_REMATCH[1]}"
+else
+    echo ERROR: cannot parse major version number from version "$ver"
+    exit 1
+fi
+
+"get_$category" "$ostree_dir" | "format_${category}_$format"
diff --git a/.ostree/packages-runtime.txt b/.ostree/packages-runtime.txt
new file mode 100644
index 00000000..fe7d0282
--- /dev/null
+++ b/.ostree/packages-runtime.txt
@@ -0,0 +1,19 @@
+bash
+coreutils
+corosync
+corosync-qdevice
+corosync-qnetd
+curl
+fence-agents-all
+fence-agents-ipmilan
+fence-virt
+grep
+libknet1-plugins-all
+nss-tools
+openssl
+pacemaker
+pcs
+pcs-snmp
+resource-agents
+sbd
+sed
diff --git a/.ostree/packages-testing.txt b/.ostree/packages-testing.txt
new file mode 100644
index 00000000..679b1f08
--- /dev/null
+++ b/.ostree/packages-testing.txt
@@ -0,0 +1 @@
+pcs
diff --git a/.ostree/roles-runtime.txt b/.ostree/roles-runtime.txt
new file mode 100644
index 00000000..3bfffc9b
--- /dev/null
+++ b/.ostree/roles-runtime.txt
@@ -0,0 +1,3 @@
+certificate
+firewall
+selinux
diff --git a/.sanity-ansible-ignore-2.13.txt b/.sanity-ansible-ignore-2.13.txt
index 608d7700..351c1470 100644
--- a/.sanity-ansible-ignore-2.13.txt
+++ b/.sanity-ansible-ignore-2.13.txt
@@ -29,3 +29,4 @@ plugins/module_utils/ha_cluster_lsr/pcs_api_v2_utils.py import-3.9!skip
 plugins/module_utils/ha_cluster_lsr/pcs_api_v2_utils.py import-3.10!skip
 tests/ha_cluster/unit/test_pcs_api_v2.py shebang!skip
 tests/ha_cluster/unit/test_pcs_qdevice_certs.py shebang!skip
+roles/ha_cluster/.ostree/get_ostree_data.sh shebang!skip
diff --git a/.sanity-ansible-ignore-2.14.txt b/.sanity-ansible-ignore-2.14.txt
index 60eb30b5..641760ec 100644
--- a/.sanity-ansible-ignore-2.14.txt
+++ b/.sanity-ansible-ignore-2.14.txt
@@ -32,3 +32,4 @@ plugins/module_utils/ha_cluster_lsr/pcs_api_v2_utils.py import-3.10!skip
 plugins/module_utils/ha_cluster_lsr/pcs_api_v2_utils.py import-3.11!skip
 tests/ha_cluster/unit/test_pcs_api_v2.py shebang!skip
 tests/ha_cluster/unit/test_pcs_qdevice_certs.py shebang!skip
+roles/ha_cluster/.ostree/get_ostree_data.sh shebang!skip
diff --git a/.sanity-ansible-ignore-2.15.txt b/.sanity-ansible-ignore-2.15.txt
index 60eb30b5..641760ec 100644
--- a/.sanity-ansible-ignore-2.15.txt
+++ b/.sanity-ansible-ignore-2.15.txt
@@ -32,3 +32,4 @@ plugins/module_utils/ha_cluster_lsr/pcs_api_v2_utils.py import-3.10!skip
 plugins/module_utils/ha_cluster_lsr/pcs_api_v2_utils.py import-3.11!skip
 tests/ha_cluster/unit/test_pcs_api_v2.py shebang!skip
 tests/ha_cluster/unit/test_pcs_qdevice_certs.py shebang!skip
+roles/ha_cluster/.ostree/get_ostree_data.sh shebang!skip
diff --git a/README-ostree.md b/README-ostree.md
new file mode 100644
index 00000000..a9f0185b
--- /dev/null
+++ b/README-ostree.md
@@ -0,0 +1,66 @@
+# rpm-ostree
+
+The role supports running on [rpm-ostree](https://coreos.github.io/rpm-ostree/)
+systems. The primary issue is that the `/usr` filesystem is read-only, and the
+role cannot install packages. Instead, it will just verify that the necessary
+packages and any other `/usr` files are pre-installed. The role will change the
+package manager to one that is compatible with `rpm-ostree` systems.
+
+## Building
+
+To build an ostree image for a particular operating system distribution and
+version, use the script `.ostree/get_ostree_data.sh` to get the list of
+packages. If the role uses other system roles, then the script will include the
+packages for the other roles in the list it outputs.  The list of packages will
+be sorted in alphanumeric order.
+
+Usage:
+
+```bash
+.ostree/get_ostree_data.sh packages runtime DISTRO-VERSION FORMAT
+```
+
+`DISTRO-VERSION` is in the format that Ansible uses for `ansible_distribution`
+and `ansible_distribution_version` - for example, `Fedora-38`, `CentOS-8`,
+`RedHat-9.4`
+
+`FORMAT` is one of `toml`, `json`, `yaml`, `raw`
+
+* `toml` - each package in a TOML `[[packages]]` element
+
+```toml
+[[packages]]
+name = "package-a"
+version = "*"
+[[packages]]
+name = "package-b"
+version = "*"
+...
+```
+
+* `yaml` - a YAML list of packages
+
+```yaml
+- package-a
+- package-b
+...
+```
+
+* `json` - a JSON list of packages
+
+```json
+["package-a","package-b",...]
+```
+
+* `raw` - a plain text list of packages, one per line
+
+```bash
+package-a
+package-b
+...
+```
+
+What format you choose depends on which image builder you are using.  For
+example, if you are using something based on
+[osbuild-composer](https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html-single/composing_installing_and_managing_rhel_for_edge_images/index#creating-an-image-builder-blueprint-for-a-rhel-for-edge-image-using-the-command-line-interface_composing-a-rhel-for-edge-image-using-image-builder-command-line),
+you will probably want to use the `toml` output format.
diff --git a/meta/collection-requirements.yml b/meta/collection-requirements.yml
index 5b6e6bdf..08257d28 100644
--- a/meta/collection-requirements.yml
+++ b/meta/collection-requirements.yml
@@ -1,5 +1,7 @@
 # SPDX-License-Identifier: MIT
 ---
 collections:
+  - ansible.posix
+  - ansible.utils
   - community.general
   - fedora.linux_system_roles
diff --git a/tasks/enable-package-repositories.yml b/tasks/enable-package-repositories.yml
index d317e7fb..8eec01b5 100644
--- a/tasks/enable-package-repositories.yml
+++ b/tasks/enable-package-repositories.yml
@@ -26,3 +26,4 @@
   when:
     - ha_cluster_enable_repos
     - __ha_cluster_enable_repo_tasks_file is defined
+    - ansible_facts.pkg_mgr | d() != "ansible.posix.rhel_rpm_ostree"
diff --git a/tasks/main.yml b/tasks/main.yml
index ceb3e16f..f0a43bce 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -13,8 +13,7 @@
     name: "{{
       __ha_cluster_role_essential_packages
       +
-      ha_cluster_extra_packages
-    }}"
+      ha_cluster_extra_packages }}"
     state: present
 
 - name: Check and prepare role variables
@@ -26,9 +25,8 @@
   user:
     name: hacluster
     password: "{{
-      ha_cluster_hacluster_password | string
-      | password_hash('sha512', ansible_hostname.replace('-', 'x')[:16])
-    }}"
+      ha_cluster_hacluster_password | string |
+      password_hash('sha512', ansible_hostname.replace('-', 'x')[:16]) }}"
   when:
     - ha_cluster_hacluster_password | string | length > 0
 
diff --git a/tasks/set_vars.yml b/tasks/set_vars.yml
index 818efd4e..7fab9e6e 100644
--- a/tasks/set_vars.yml
+++ b/tasks/set_vars.yml
@@ -5,6 +5,24 @@
   when: __ha_cluster_required_facts |
     difference(ansible_facts.keys() | list) | length > 0
 
+- name: Ensure correct package manager for ostree systems
+  vars:
+    ostree_pkg_mgr: ansible.posix.rhel_rpm_ostree
+    ostree_booted_file: /run/ostree-booted
+  when: ansible_facts.pkg_mgr | d("") != ostree_pkg_mgr
+  block:
+    - name: Check if system is ostree
+      stat:
+        path: "{{ ostree_booted_file }}"
+      register: __ostree_booted_stat
+
+    - name: Set package manager to use for ostree
+      ansible.utils.update_fact:
+        updates:
+          - path: ansible_facts.pkg_mgr
+            value: "{{ ostree_pkg_mgr }}"
+      when: __ostree_booted_stat.stat.exists
+
 - name: Set platform/version specific variables
   include_vars: "{{ __vars_file }}"
   loop:
diff --git a/tasks/test_cleanup_qnetd.yml b/tasks/test_cleanup_qnetd.yml
index 7ce4af56..4f513607 100644
--- a/tasks/test_cleanup_qnetd.yml
+++ b/tasks/test_cleanup_qnetd.yml
@@ -11,8 +11,10 @@
     name:
       - corosync-qnetd
     state: absent
+  when: ansible_facts.pkg_mgr | d() != "ansible.posix.rhel_rpm_ostree"
 
 - name: Make sure qnetd config files are not present
   file:
     path: /etc/corosync/qnetd
     state: absent
+  when: ansible_facts.pkg_mgr | d() != "ansible.posix.rhel_rpm_ostree"
diff --git a/tasks/test_setup.yml b/tasks/test_setup.yml
index 51b4d6fc..51126d35 100644
--- a/tasks/test_setup.yml
+++ b/tasks/test_setup.yml
@@ -16,9 +16,42 @@
     gather_subset: min
   when: "'distribution' not in ansible_facts"
 
+- name: Ensure correct package manager for ostree systems
+  vars:
+    ostree_pkg_mgr: ansible.posix.rhel_rpm_ostree
+    ostree_booted_file: /run/ostree-booted
+  when: ansible_facts.pkg_mgr | d("") != ostree_pkg_mgr
+  block:
+    - name: Check if system is ostree
+      stat:
+        path: "{{ ostree_booted_file }}"
+      register: __ostree_booted_stat
+
+    - name: Set package manager to use for ostree
+      ansible.utils.update_fact:
+        updates:
+          - path: ansible_facts.pkg_mgr
+            value: "{{ ostree_pkg_mgr }}"
+      when: __ostree_booted_stat.stat.exists
+
 # Test systems may not have repositories available through subscriptions
 - name: Do not try to enable RHEL repositories
   set_fact:
     ha_cluster_enable_repos: false
   when:
     - ansible_distribution == 'RedHat'
+
+# HACK - test systems build ostree images with /usr/lib/passwd
+# have to copy hacluster user to /etc/passwd
+# also coroqnetd user for nss db ownership
+- name: >-
+    Copy nss-altfiles ha_cluster users to /etc/passwd
+  shell: |
+    for username in hacluster coroqnetd; do
+      if ! grep -q "^$username" /etc/passwd && \
+        grep -q "^$username" /usr/lib/passwd; then
+          grep "^$username" /usr/lib/passwd >> /etc/passwd
+      fi
+    done
+  when: ansible_facts.pkg_mgr | d() == "ansible.posix.rhel_rpm_ostree"
+  changed_when: true
diff --git a/tests/tests_cluster_basic_custom_fence_agents.yml b/tests/tests_cluster_basic_custom_fence_agents.yml
index 2d42f58b..8055834d 100644
--- a/tests/tests_cluster_basic_custom_fence_agents.yml
+++ b/tests/tests_cluster_basic_custom_fence_agents.yml
@@ -21,6 +21,7 @@
           package:
             name: fence-agents-all
             state: absent
+          when: ansible_facts.pkg_mgr | d() != "ansible.posix.rhel_rpm_ostree"
 
         - name: Run HA Cluster role
           include_role:
@@ -29,12 +30,14 @@
 
         - name: Get packages status
           package_facts:
+          when: ansible_facts.pkg_mgr | d() != "ansible.posix.rhel_rpm_ostree"
 
         - name: Check installed fence-agents packages
           assert:
             that:
               - "'fence-agents-all' not in ansible_facts.packages"
               - "'fence-agents-ipmilan' in ansible_facts.packages"
+          when: ansible_facts.pkg_mgr | d() != "ansible.posix.rhel_rpm_ostree"
 
         - name: Check cluster status
           include_tasks: tasks/assert_cluster_running.yml
diff --git a/tests/tests_cluster_basic_custom_packages.yml b/tests/tests_cluster_basic_custom_packages.yml
index d7203e46..4cc3f8c8 100644
--- a/tests/tests_cluster_basic_custom_packages.yml
+++ b/tests/tests_cluster_basic_custom_packages.yml
@@ -18,6 +18,10 @@
             name: linux-system-roles.ha_cluster
             tasks_from: test_setup.yml
 
+        - name: Skip test on ostree systems
+          meta: end_host
+          when: ansible_facts.pkg_mgr | d() == "ansible.posix.rhel_rpm_ostree"
+
         - name: Ensure extra package is not installed
           package:
             name: "{{ __test_extra_package }}"
diff --git a/tests/tests_qdevice_tls_kaptb_options.yml b/tests/tests_qdevice_tls_kaptb_options.yml
index f24d299f..d3c39117 100644
--- a/tests/tests_qdevice_tls_kaptb_options.yml
+++ b/tests/tests_qdevice_tls_kaptb_options.yml
@@ -13,6 +13,24 @@
             (ansible_play_hosts_all | length == 1)
             | ternary('localhost', ansible_play_hosts[0]) }}"
 
+    - name: Ensure correct package manager for ostree systems
+      vars:
+        ostree_pkg_mgr: ansible.posix.rhel_rpm_ostree
+        ostree_booted_file: /run/ostree-booted
+      when: ansible_facts.pkg_mgr | d("") != ostree_pkg_mgr
+      block:
+        - name: Check if system is ostree
+          stat:
+            path: "{{ ostree_booted_file }}"
+          register: __ostree_booted_stat
+
+        - name: Set package manager to use for ostree
+          ansible.utils.update_fact:
+            updates:
+              - path: ansible_facts.pkg_mgr
+                value: "{{ ostree_pkg_mgr }}"
+          when: __ostree_booted_stat.stat.exists
+
     # Install pcs so we can detect whether it supports tls and kaptb options
     - name: Install pcs
       package: