diff --git a/roles/cache_clear/cache_clear-opcache/defaults/main.yml b/roles/cache_clear/cache_clear-opcache/defaults/main.yml
index d7f4af62..bf28c5b0 100644
--- a/roles/cache_clear/cache_clear-opcache/defaults/main.yml
+++ b/roles/cache_clear/cache_clear-opcache/defaults/main.yml
@@ -1,12 +1,14 @@
 ---
 cache_clear_opcache:
   # Adapter string to use as argument.
-  # eg.
+  # e.g.
   # --fcgi=127.0.0.1:9000
-  # Leave blank to use /etc/cachetool.yml
-  # adapter: "--fcgi=127.0.0.1:9081" # Leave commented to automatically detect the adapter based on PHP version.
+  # --fcgi=/var/run/php-fpm.sock
+  # Provide an empty string to use /etc/cachetool.yml
+  # adapter: "--fcgi=127.0.0.1:9081"  # Leave commented to automatically detect the adapter based on PHP version.
+  unix_socket: false  # Set to true to use automatic detection of Unix socket as set by ce-provision
   # Bins to clear.
   clear_opcache: true
   clear_apcu: false
   clear_stat: true
-  # cachetool_bin: "/path/to/cachetool.phar" # see _init for paths if undefined
+  # cachetool_bin: "/path/to/cachetool.phar"  # see _init for default paths if undefined
diff --git a/roles/cache_clear/cache_clear-opcache/tasks/main.yml b/roles/cache_clear/cache_clear-opcache/tasks/main.yml
index 97f91ed4..56507c4a 100644
--- a/roles/cache_clear/cache_clear-opcache/tasks/main.yml
+++ b/roles/cache_clear/cache_clear-opcache/tasks/main.yml
@@ -6,10 +6,18 @@
     executable: /bin/bash
   register: _php_version
 
-- name: Set cachetool adapter.
+- name: Set cachetool adapter specified or default to a TCP/IP port.
   ansible.builtin.set_fact:
     _cachetool_adapter: "{{ cache_clear_opcache.adapter | default('--fcgi=127.0.0.1:90' + _php_version.stdout | replace('.','')) }}"
 
+- name: Override cachetool adapter to be a Unix socket if requested.
+  ansible.builtin.set_fact:
+    _cachetool_adapter: "--fcgi=/var/run/php{{ _php_version.stdout | replace('.','') }}-fpm.sock"
+  when:
+    - cache_clear_opcache.unix_socket
+    - cache_clear_opcache.adapter is not defined
+
+# cachetool_bin is set in the _init role.
 - name: Clear opcache.
   ansible.builtin.command:
     cmd: "{{ cachetool_bin }} {{ _cachetool_adapter }} -n opcache:reset"