Add support for logrotate and supervisor

Issue #9

README.md

@@ -19,6 +19,7 @@ For other methods to install SaltStack please refer to the [Official SaltStack I
   - [Git Fileserver](#git-fileserver)
     - [GitPython](#gitpython)
     - [PyGit2](#pygit2)
+  - [Logs](#logs)
   - [Available Configuration Parameters](#available-configuration-parameters)
 - [Usage](#usage)
 - [Shell Access](#shell-access)
@@ -171,6 +172,22 @@ _pygit2.GitError: Failed to authenticate SSH session: Unable to send userauth-pu
 
 look if your private key hash empty lines at the bottom of the file and suppress them for solving the error.
 
+### Logs
+
+Salt logs are accessible by mounting the volume `/home/salt/data/logs/`.
+
+Inside that directory you could find `supervisor/` logs and `salt/` logs:
+
+docker run --name salt_master --detach \
+    --publish 4505:4505/tcp --publish 4506:4506/tcp \
+    --env 'SALT_LOG_LEVEL=info' \
+    --volume $(pwd)/recipes/:/home/salt/data/srv/ \
+    --volume $(pwd)/keys/:/home/salt/data/keys/ \
+    --volume $(pwd)/logs/:/home/salt/data/logs/ \
+    cdalvaro/saltstack-master:2018.3.3
+
+Check [Available Configuration Parameters](#available-configuration-parameters) section for configuring logrotate.
+
 ### Available Configuration Parameters
 
 Please refer the docker run command options for the `--env-file` flag where you can specify all required environment variables in a single file. This will save you from writing a potentially long docker run command. Alternatively you can use docker-compose.
@@ -182,6 +199,8 @@ Below is the list of available options that can be used to customize your SaltSt
 | `DEBUG` | Set this to `true` to enable entrypoint debugging. |
 | `TIMEZONE` | Set the container timezone. Defaults to `UTC`. Values are expected to be in Canonical format. Example: `Europe/Madrid`. See the list of [acceptable values](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones). |
 | `SALT_LOG_LEVEL` | The level of messages to send to the console. One of 'garbage', 'trace', 'debug', info', 'warning', 'error', 'critical'. Default: `warning` |
+| `SALT_LOG_ROTATE_FREQUENCY` | Logrotate frequency for salt logs. Available options are 'daily', 'weekly', 'monthly', and 'yearly'. Default: `weekly` |
+| `SALT_LOG_ROTATE_RETENTION` | Keep x files before deleting old log files. Defaults: `52` |
 | `SALT_LEVEL_LOGFILE` | The level of messages to send to the log file. One of 'garbage', 'trace', 'debug', info', 'warning', 'error', 'critical'. Default: `warning` |
 | `SALT_MASTER_SIGN_PUBKEY` | Sign the master auth-replies with a cryptographic signature of the master's public key. Possible values: 'True' or 'False'. Default: `False` |
 | `SALT_MASTER_USE_PUBKEY_SIGNATURE` | Instead of computing the signature for each auth-reply, use a pre-calculated signature. This option requires `SALT_MASTER_SIGN_PUBKEY` set to 'True'. Possible values: 'True' or 'False'. Default: `True` |