# Basic configurations
The configuration file for eKuiper is at ``$kuiper/etc/kuiper.yaml``. The configuration file is yaml format.
## Log level
```yaml
basic:
# true|false, with debug level, it prints more debug info
debug: false
# true|false, if it's set to true, then the log will be print to console
consoleLog: false
# true|false, if it's set to true, then the log will be print to log file
fileLog: true
# How many hours to split the file
rotateTime: 24
# Maximum file storage hours
maxAge: 72
```
## system log
When the user sets the value of the environment variable named KuiperSyslogKey to true, the log will be printed to the syslog.
## Cli Addr
```yaml
basic:
# CLI bind IP
ip: 0.0.0.0
# CLI port
port: 20498
```
## Rest Service Configuration
```yaml
basic:
# REST service bind IP
restIp: 0.0.0.0
# REST service port
restPort: 9081
restTls:
certfile: /var/https-server.crt
keyfile: /var/https-server.key
```
### restPort
The port for the rest api http server to listen to.
### restTls
The tls cert file path and key file path setting. If restTls is not set, the rest api server will listen on http. Otherwise, it will listen on https.
## Prometheus Configuration
eKuiper can export metrics to prometheus if ``prometheus`` option is true. The prometheus will be served with the port specified by ``prometheusPort`` option.
```yaml
basic:
prometheus: true
prometheusPort: 20499
```
For such a default configuration, eKuiper will export metrics and serve prometheus at `http://localhost:20499/metrics`
## Pluginhosts Configuration
The URL where hosts all of pre-build plugins. By default it's at `packages.emqx.io`. There could be several hosts (host can be separated with comma), if same package could be found in the several hosts, then the package in the 1st host will have the highest priority.
Please notice that only the plugins that can be installed to the current eKuiper instance will be listed through below Rest-APIs.
```
GET http://localhost:9081/plugins/sources/prebuild
GET http://localhost:9081/plugins/sinks/prebuild
GET http://localhost:9081/plugins/functions/prebuild
```
It has following conditions to make the plugins listed through previous APIs,
- eKuiper version: The plugins must be built for the eKuiper instance version. If the plugins cannot be found for a specific version, no plugins will be returned.
- Operating system: Now only Linux system is supported, so if eKuiper is running at other operating systems, no plugins will be returned.
- CPU architecture: Only with correct CPU architecture built plugins are found in the plugin repository can the plugins be returned.
- EMQ official released Docker images: Only when the eKuiper is running at EMQ official released Docker images can the plugins be returned.
```yaml
pluginHosts: https://packages.emqx.io
```
It could be also as following, you can specify a local repository, and the plugin in that repository will have higher priorities.
```yaml
pluginHosts: https://local.repo.net, https://packages.emqx.io
```
The directory structure of the plugins should be similar as following.
```
http://host:port/kuiper-plugins/0.9.1/alpine/sinks
http://host:port/kuiper-plugins/0.9.1/alpine/sources
http://host:port/kuiper-plugins/0.9.1/alpine/functions
```
The content of the page should be similar as below.
```html
Directory listing for enterprise: /4.1.1/
Directory listing for enterprise: /4.1.1/
```
## Sink configurations
```yaml
#The cache persistence threshold size. If the message in sink cache is larger than 10, then it triggers persistence. If you find the remote system is slow to response, or sink throughput is small, then it's recommend to increase below 2 configurations.More memory is required with the increase of below 2 configurations.
# If the message count reaches below value, then it triggers persistence.
cacheThreshold: 10
# The message persistence is triggered by a ticker, and cacheTriggerCount is for using configure the count to trigger the persistence procedure regardless if the message number reaches cacheThreshold or not. This is to prevent the data won't be saved as the cache never pass the threshold.
cacheTriggerCount: 15
# Control to disable cache or not. If it's set to true, then the cache will be disabled, otherwise, it will be enabled.
disableCache: false
```