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+# ONAP python logging package
+- python-package onappylog extend python standard logging library which
+could be used in any python project to log MDC(Mapped Diagnostic Contex)
+and easy to reload logging at runtime.
+
+-----
+
+## install package
+```bash
+  pip install onappylog
+```
+
+## Usage
+
+### 1. MDC monkey patch
+
+Import the MDC monkey patch making logRecord to store context in local thread.
+
+```python
+   from onaplogging import monkey; monkey.patch_loggingMDC()
+```
+Import the MDC format to be used to configure mdc output format.
+Please replace your old logging format with mdc format in configuration.
+
+
+```python
+  from onaplogging import mdcformatter
+```
+the mdc format  example
+```python
+'mdcFormater':{
+          '()': mdcformatter.MDCFormatter, # Use MDCFormatter instance to convert logging string
+          'format': '%(mdc)s and other %-style key ', #  Add '%(mdc)s' here.
+          'mdcfmt':  '{key1} {key2}', # Define your mdc keys here.
+          'datefmt': '%Y-%m-%d %H:%M:%S'  # date format
+      }
+```
+
+Import MDC to store context in python file with logger
+code.
+
+```python
+from onaplogging.mdcContext import MDC
+# add mdc  
+MDC.put("key1", "value1")
+MDC.put("key2", "value2")
+
+# origin code
+logger.info("msg")
+logger.debug("debug")
+
+```
+
+### 2. Reload logging at runtime
+
+It's thread safe to reload logging. If you want to use this feature,
+must use yaml file to configure logging.
+
+
+import the  yaml monkey patch and load logging yaml file
+
+```python
+  from onaplogging import monkey,monkey.patch_loggingYaml()
+  # yaml config
+  config.yamlConfig(filepath=<yaml filepath>, watchDog=True)
+```
+
+Notice that the watchDog is opening,So your logging could be reloaded at runtime.
+if you modify yaml file to change handler、filter or format,
+the logger in program will be reloaded to use new configuration.
+
+Set watchDog to **false**, If you don't need to reloaded logging.
+
+
+
+
+Yaml configure exmaple
+
+```yaml
+version: 1
+
+disable_existing_loggers: True
+
+loggers:
+vio:
+    level: DEBUG
+    handlers: [vioHandler]
+    propagate: False
+handlers:
+vioHandler:
+    class: logging.handlers.RotatingFileHandler
+    level: DEBUG
+    filename: /var/log/bt.log
+    mode: a
+    maxBytes: 1024*1024*50
+    backupCount: 10
+    formatter: mdcFormatter
+formatters:
+  mdcFormatter:
+    format: "%(asctime)s:[%(name)s] %(created)f %(module)s %(funcName)s %(pathname)s %(process)d %(levelno)s :[ %(threadName)s  %(thread)d]: [%(mdc)s]: [%(filename)s]-[%(lineno)d] [%(levelname)s]:%(message)s"
+    mdcfmt: "{key1} {key2} {key3} {key4} dwdawdwa "
+    datefmt: "%Y-%m-%d %H:%M:%S"
+    (): onaplogging.mdcformatter.MDCFormatter
+  standard:
+    format: '%(asctime)s:[%(name)s]:[%(filename)s]-[%(lineno)d]
+        [%(levelname)s]:%(message)s  '
+    datefmt: "%Y-%m-%d %H:%M:%S"
+
+```
+
+
+### 3. reference
+
+[What's MDC?](https://logging.apache.org/log4j/2.x/manual/thread-context.html)
+
+[Onap Logging Guidelines](https://wiki.onap.org/pages/viewpage.action?pageId=20087036)
+
+[Python Standard Logging Library](https://docs.python.org/2/library/logging.html)