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# OpenIM Configuration File Descriptions and Common Configuration Modifications
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## External Component Configurations
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| Configuration File | Description |
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| ------------------ |-------------------------------------------------------------|
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| **kafka.yml** | Configuration for Kafka username, password, address, etc. |
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| **redis.yml** | Configuration for Redis password, address, etc. |
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| **minio.yml** | Configuration for MinIO username, password, address, etc. |
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| **mongodb.yml** | Configuration for MongoDB username, password, address, etc. |
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| **discovery.yml** | Service discovery and etcd credentials and address. |
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## OpenIMServer Related Configurations
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| Configuration File | Description |
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| ------------------------------- | ---------------------------------------------- |
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| **log.yml** | Configuration for logging levels and storage directory |
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| **notification.yml** | Event notification settings (e.g., add friend, create group) |
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| **share.yml** | Common settings for all services (e.g., secrets) |
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| **webhooks.yml** | Webhook URLs and related settings |
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| **local-cache.yml** | Local cache settings (generally do not modify) |
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| **openim-rpc-third.yml** | openim-rpc-third listen IP, port, and object storage settings |
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| **openim-rpc-user.yml** | openim-rpc-user listen IP and port settings |
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| **openim-api.yml** | openim-api listen IP, port, and other settings |
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| **openim-crontask.yml** | openim-crontask scheduled task settings |
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| **openim-msggateway.yml** | openim-msggateway listen IP, port, and other settings |
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| **openim-msgtransfer.yml** | Settings for openim-msgtransfer service |
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| **openim-push.yml** | openim-push listen IP, port, and offline push settings |
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| **openim-rpc-auth.yml** | openim-rpc-auth listen IP, port, token validity settings |
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| **openim-rpc-conversation.yml** | openim-rpc-conversation listen IP and port settings |
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| **openim-rpc-friend.yml** | openim-rpc-friend listen IP and port settings |
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| **openim-rpc-group.yml** | openim-rpc-group listen IP and port settings |
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| **openim-rpc-msg.yml** | openim-rpc-msg listen IP and port settings |
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## Monitoring and Alerting Related Configurations
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| Configuration File | Description |
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| ------------------------------ | --------------- |
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| **prometheus.yml** | Prometheus configuration |
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| **instance-down-rules.yml** | Alert rules |
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| **alertmanager.yml** | Alertmanager configuration |
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| **email.tmpl** | Email alert template |
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| **grefana-template/Demo.json** | Default Grafana dashboard |
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## Common Configuration Modifications
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| Configuration Item | Configuration File |
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| -------------------------------------------------------- | ----------------------- |
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| Configure MinIO as object storage (focus on the externalAddress field) | `minio.yml` |
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| Adjust log level and number of log files | `log.yml` |
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| Enable or disable friend verification when sending messages | `openim-rpc-msg.yml` |
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| OpenIMServer secret | `share.yml` |
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| Configure OSS, COS, AWS, or Kodo as object storage | `openim-rpc-third.yml` |
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| Multi-end mutual kick strategy and max concurrent connections per gateway | `openim-msggateway.yml` |
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| Offline message push configuration | `openim-push.yml` |
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| Configure webhooks for callback notifications (e.g., before/after message send) | `webhooks.yml` |
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| Whether new group members can view historical messages | `openim-rpc-group.yml` |
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| Token expiration time settings | `openim-rpc-auth.yml` |
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| Scheduled task settings (e.g., how long to retain messages) | `openim-crontask.yml` |
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## Starting Multiple Instances of a Service and Maximum File Descriptors
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To start multiple instances of an OpenIM service, simply add the corresponding port numbers and modify the `start-config.yml` file in the project’s root directory,
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then restart the service. For example, to start 2 instances of `openim-rpc-user`:
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```yaml
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rpc:
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registerIP: ''
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listenIP: 0.0.0.0
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ports: [ 10110, 10111 ]
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prometheus:
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enable: true
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ports: [ 20100, 20101 ]
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```
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Modify`start-config.yml`:
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```yaml
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serviceBinaries:
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openim-rpc-user: 2
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```
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To set the maximum number of open file descriptors (typically one per online user):
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```
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maxFileDescriptors: 10000
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```
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