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+
+                                             ----------------------
+                                    |--------| web1/apache/centos |--------|        -----------------------
+-------------------------------     |        ----------------------        |--------| db01/centos/mariadb |
+| ha01/haproxy/acme.sh/centos |-----|                                      |        -----------------------
+-------------------------------     |        ----------------------        |--------| cache01/debian/redis|
+                                    |--------| web2/nginx/debian  |--------|        -----------------------
+                                             ----------------------