diff --git a/collections.yml b/collections.yml
new file mode 100644
index 000000000..77c100ee3
--- /dev/null
+++ b/collections.yml
@@ -0,0 +1,13 @@
+# IIAB requires the Ansible Collections listed below.  Explanations here:
+# http://FAQ.IIAB.IO > "What is Ansible and what version should I use?"
+# https://github.com/iiab/iiab/blob/master/scripts/ansible.md
+
+---
+collections:
+  - name: community.general
+  - name: community.mysql
+  - name: ansible.posix    # 2020-11-28: For ~3 modules below...
+
+# selinux WAS in /opt/iiab/iiab/roles/1-prep/tasks/main.yml
+# sysctl      in /opt/iiab/iiab/roles/2-common/tasks/main.yml
+# synchronize in /opt/iiab/iiab-admin-console/roles/js-menu/tasks/main.yml
diff --git a/iiab-install b/iiab-install
index 261893cf3..f4d45d05c 100755
--- a/iiab-install
+++ b/iiab-install
@@ -8,7 +8,7 @@ INVENTORY=ansible_hosts
 IIAB_STATE_FILE=/etc/iiab/iiab_state.yml
 ARGS=""
 CWD=`pwd`
-OS=`grep ^ID= /etc/*release|cut -d= -f2`
+OS=`grep ^ID= /etc/os-release | cut -d= -f2`
 OS=${OS//\"/}
 MIN_RPI_KERN=4.19.97       # If using Raspbian, 'rpi-update' should no longer be nec -- please use Raspbian 2020-02-13 or higher: https://github.com/iiab/iiab/issues/1993
 MIN_ANSIBLE_VER=2.8.11     # Ansible 2.8.3 and 2.8.6 have serious bugs, preventing their use with IIAB.
diff --git a/scripts/ansible b/scripts/ansible
index bfd02e073..0bc127605 100755
--- a/scripts/ansible
+++ b/scripts/ansible
@@ -15,8 +15,8 @@ GOOD_VER="2.10.3"    # Orig for 'yum install [rpm]' & XO laptops (pip install)
 # IIAB implementers might instead consider these 2 GENERAL TECHNIQUES below
 # ("in an emergency!") e.g. if you must install an older version of Ansible:
 
-# TEMPORARILY USE ANSIBLE 2.9.13 (REMOVE IT WITH "pip uninstall ansible")
-#pip install ansible==2.9.13
+# TEMPORARILY USE ANSIBLE 2.9.15 (REMOVE IT WITH "pip uninstall ansible")
+#pip install ansible==2.9.15
 
 # TEMPORARILY USE ANSIBLE 2.4.2 DUE TO 2.4.3 MEMORY BUG. Details: iiab/iiab#669
 #echo "Install http://download.iiab.io/packages/ansible_2.4.2.0-1ppa~xenial_all.deb"
@@ -93,14 +93,15 @@ $APT_PATH/apt -y --allow-downgrades install ansible-base \
 
 # (Re)running collection installs appears safe, with --force-with-deps to force
 # upgrade of collection and dependencies it pulls in.  Note Ansible may support
-# upgrading all collections cleanly in future.  See PR #2652 (links) & PR #2653
-echo -e "\n\nIIAB requires these 3 Ansible Collections: (we upgrade them here if possible!)\n"
-ansible-galaxy collection install --force-with-deps community.general
-ansible-galaxy collection install --force-with-deps community.mysql
-ansible-galaxy collection install --force-with-deps ansible.posix # For 3 below
-# selinux WAS in /opt/iiab/iiab/roles/1-prep/tasks/main.yml
-# sysctl in      /opt/iiab/iiab/roles/2-common/tasks/main.yml
-# synchronize in /opt/iiab/iiab-admin-console/roles/js-menu/tasks/main.yml
+# upgrading all collections cleanly in future.  See PRs #2647 #2652 #2653 #2655
+echo -e "\n\nIIAB requires these ~3 Ansible Collections: (we upgrade them here if possible!)\n"
+ansible-galaxy collection install --force-with-deps \
+               -r /opt/iiab/iiab/collections.yml \
+               -p /usr/share/ansible/collections
+# 2020-11-28: The ~3 Ansible Collections used by IIAB (~37MB) once lived here:
+#    /root/.ansible/collections/ansible_collections
+# But going forward they'll be stored herein:
+#    /usr/share/ansible/collections/ansible_collections
 
 echo -e "\n\nCreating/verifying directory /etc/ansible & installing /etc/ansible/hosts\n"
 mkdir -p /etc/ansible