Docker Extension

dockerextension.json

 {
            "type": "extensions",
            "name": "DockerExtension",
            "tags": {
              "displayName": "DockerExtension"
            },
            "apiVersion": "2016-03-30",
            "location": "[resourceGroup().location]",
            "dependsOn": [
              "[resourceId('Microsoft.Compute/virtualMachines/', variables('vmName'))]",
              "[resourceId('Microsoft.Compute/virtualMachines/extensions', variables('vmName'), 'CustomScript')]"
            ],
            "properties": {
              "publisher": "Microsoft.Azure.Extensions",
              "type": "DockerExtension",
              "typeHandlerVersion": "1.2",
              "autoUpgradeMinorVersion": true,
              "settings": {
                "compose": {
                  "geoserver": {
                    "image": "roamregistry.azurecr.io/geoserverazure:dev",
                    "ports": [ "8080:8080" ],
                    "volumes": [
                      "/media/geotiffstore/backdrops:/backdrop",
                      "/media/geoserverdatadir:/opt/geoserver/data_dir",
                      "/media/data1:/geowebcache"                    
                    ]
                  }
                },
                "installonly": "false"
              },
              "protectedSettings": {

                "login": {
                  "server": "https://roamregistry.azurecr.io",
                  "username": "roamregistry",
                  "password": "xxxx",
                  "email": "name@example.com"
                }
              }
            }
          }