Copied from rancher community catalog as starting point

templates/Guacamole/0/docker-compose.yml

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+database-data:
+  image: busybox
+  labels:
+    io.rancher.container.start_once: 'true'
+  net: none
+  entrypoint: /bin/true
+  volumes:
+    - /var/lib/mysql
+    - /docker-entrypoint-initdb.d
+database:
+  image: mariadb
+  environment:
+    MYSQL_DATABASE: ${guacamole_db}
+    MYSQL_ONETIME_PASSWORD: 'true'
+    MYSQL_PASSWORD: ${guacamole_password}
+    MYSQL_RANDOM_ROOT_PASSWORD: 'true'
+    MYSQL_USER: ${guacamole_user}
+  volumes_from:
+    - database-data
+  labels:
+    io.rancher.sidekicks: setup-get-db-script, database-data
+setup-get-db-script:
+  image: glyptodon/guacamole:0.9.10-incubating
+  net: none
+  volumes_from:
+    - database-data
+  command:
+  - bash
+  - -c
+  - /opt/guacamole/bin/initdb.sh --mysql > /docker-entrypoint-initdb.d/initdb.sql
+  labels:
+    io.rancher.container.start_once: 'true'
+guacd:
+  image: glyptodon/guacd:0.9.10-incubating
+guacamole:
+  image: glyptodon/guacamole:0.9.10-incubating
+  environment:
+    MYSQL_DATABASE: ${guacamole_db}
+    MYSQL_HOSTNAME: database
+    MYSQL_PASSWORD: ${guacamole_password}
+    MYSQL_USER: ${guacamole_user}
+  links:
+   - guacd:guacd
+  ports:
+    - ${public_port}:8080/tcp
+  command:
+    - /bin/bash
+    - -c
+    - cd /usr/local/tomcat/webapps;rm -rf ROOT/; ln -s guacamole.war ROOT.war; /opt/guacamole/bin/start.sh;

templates/Guacamole/0/rancher-compose.yml

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+version: '2'
+.catalog:
+  name: "apache-guacamole"
+  version: "0.1-rancher1"
+  description: " Apache Guacamole is a clientless remote desktop gateway. It supports standard protocols like VNC, RDP, and SSH."
+  minimum_rancher_version: v0.46.0
+  questions:
+
+    - variable: "guacamole_db"
+      label: "MySQL Database Name"
+      description: "Your MYSQL guacamole database name"
+      default: "guacamole_db"
+      required: true
+      type: "string"
+
+    - variable: "guacamole_user"
+      label: "MySQL Database User"
+      description: "Your MYSQL guacamole user name"
+      required: true
+      default: "guacamole_user"
+      type: "string"
+
+    - variable: "guacamole_password"
+      label: "MySQL Database Password"
+      description: "Your MYSQL guacamole user password. Defaults to \"guacamole_password\""
+      required: true
+      default: "guacamole_password"
+      type: "password"
+
+    - variable: "public_port"
+      label: "Public Port"
+      description: "The public port that Guacamole listens on, defaults to 8080"
+      required: true
+      default: 8080
+      type: "int"
+
+services:
+  guacamole:
+    scale: 1
+    health_check:
+      healthy_threshold: 2
+      response_timeout: 2000
+      port: 8080
+      unhealthy_threshold: 3
+      initializing_timeout: 60000
+      interval: 2000
+      strategy: recreate
+      request_line: GET "/guacamole" "HTTP/1.0"
+      reinitializing_timeout: 60000
+  guacd:
+    scale: 1
+    health_check:
+      healthy_threshold: 2
+      response_timeout: 2000
+      port: 4822
+      unhealthy_threshold: 3
+      initializing_timeout: 60000
+      interval: 2000
+      strategy: recreate
+      reinitializing_timeout: 60000
+  setup-get-db-script:
+    scale: 1
+  database:
+    scale: 1
+    health_check:
+      healthy_threshold: 2
+      response_timeout: 2000
+      port: 3306
+      unhealthy_threshold: 3
+      initializing_timeout: 60000
+      interval: 2000
+      strategy: recreate
+      reinitializing_timeout: 60000