MAP
  NAME XXX
  STATUS ON
  SIZE 600 600
  EXTENT 49782.1874916550004855 5149959.5214843796566129 664282.1874916550004855 7904959.5214843796566129
  UNITS METERS
  SHAPEPATH "rast"
  IMAGECOLOR 255 255 255
  TEMPLATEPATTERN "itasca"
    WEB
        METADATA
            "wms_enable_request" "*"
        END
    END

  IMAGETYPE PNG
    CONFIG "MS_ERRORFILE" "/tmp/ms_error.txt"
    DEBUG 5

  PROJECTION
    "init=epsg:3857"
  END

    WEB
        IMAGEPATH "/tmp"
        IMAGEURL "http://XXXXXX/tmp/"
        METADATA
            "wfs_title"            "XXXXXX"
            "wfs_onlineresource"   "http://XXXXXX/cgi-bin/mapserv?"
            "wfs_srs"               "EPSG:32719 EPSG:900913 EPSG:4326 EPSG:3857"
            "ows_schemas_location" "http://ogc.dmsolutions.ca"
        END
    END

    LAYER
        NAME balance_hidrico_1
        TYPE raster
        STATUS ON
        DATA "PG:host=192.168.1.XXX port=5432 dbname='XXXXXX' user='postgres' password='XXX' schema='raster' table='balance_hidrico_1' mode='2'"
        DEBUG 5
        PROJECTION
            "init=epsg:32719"
        END
        # PROCESSING "NODATA=0"
        PROCESSING "SCALE=AUTO"

        CLASS
            NAME "-15"
            EXPRESSION ([pixel] <= -15)
            COLOR "#b87711"
        END

        etc...(more LAYERS)

    END
END # Map File

this.state.bal_hidrico = new ol.layer.Tile({
            source: new ol.source.TileWMS({
                url: "http:/XXXXX/cgi-bin/mapserv?",
                serverType: 'mapserver',
                crossOrigin: 'anonymous',
                params: {
                    'LAYERS': 'balance_hidrico_1',
                    'FORMAT': 'image/png',
                    'map' : '/opt/mapfile/map_balance_hidrico.map',
                    'TILED': true
                }
            })
        });