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Add ability to configure app logs to be written to a file (#903)

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It gives users the option to send Patroni application logs to a File instead of Standard Out. There are three environment variables that can be set to enable and configure file logging.
1. `PATRONI_FILE_LOG_DIR`: Path to a directory that is writeable by the executing user. Having this variable set is what activates file logging.
2. `PATRONI_FILE_LOG_NUM`: This is a rolling file logger. This variable dictates how many log files are retained.
3. `PATRONI_FILE_LOG_SIZE`: This variable dictates the size at which the logs will roll.

If `PATRONI_FILE_LOG_DIR` is not set than Patroni will log to stderr (default behavior does not change)

Closes https://github.com/zalando/patroni/issues/902
This commit is contained in:
Lucas Capistrant
2018-12-21 15:38:29 +01:00
committed by Alexander Kukushkin
parent 491f230711
commit f3da6de129
3 changed files with 22 additions and 4 deletions
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docs/ENVIRONMENT.rst
+3 -1
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@@ -8,11 +8,13 @@ It is possible to override some of the configuration parameters defined in the P
Global/Universal
----------------
- **PATRONI\_CONFIGURATION**: it is possible to set the entire configuration for the Patroni via ``PATRONI_CONFIGURATION`` environment variable. In this case any other environment variables will not be considered!
- **PATRONI\_FILE\_LOG\_DIR**: Directory to write application logs to. The directory must exist and be writable by the user executing Patroni. If you set this env variable, the application will retain 4 25MB logs by default. You can tune those retention values with PATRONI_LOG_FILE_NUM and PATRONI_LOG_FILE_SIZE (see below).
- **PATRONI\_FILE\_LOG\_NUM**: The number of application logs to retain.
- **PATRONI\_FILE\_LOG\_SIZE**: Size of log application log file that triggers a log rolling.
- **PATRONI\_NAME**: name of the node where the current instance of Patroni is running. Must be unique for the cluster.
- **PATRONI\_NAMESPACE**: path within the configuration store where Patroni will keep information about the cluster. Default value: "/service"
- **PATRONI\_SCOPE**: cluster name
- **PATRONI\_LOGLEVEL**: sets the general logging level (see `the docs for Python logging <https://docs.python.org/3.6/library/logging.html#levels>`_)
- **PATRONI\_REQUESTS_LOGLEVEL**: sets the logging level for all HTTP requests e.g. Kubernetes API calls (see `the docs for Python logging <https://docs.python.org/3.6/library/logging.html#levels>`_)
Bootstrap configuration
-----------------------