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Merge pull request #2240 from id/update-emqx-docs 

update emqx docs
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emqx/content.md
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# What is EMQ X ?
# What is EMQX
[EMQ X MQTT broker](https://www.emqx.io/) is a fully open source, highly scalable, highly available distributed MQTT messaging broker for IoT, M2M and Mobile applications that can handle tens of millions of concurrent clients.
[EMQX MQTT broker](https://emqx.io/products/broker) is a fully open source, highly scalable, highly available distributed MQTT messaging broker for IoT, M2M and Mobile applications that can handle tens of millions of concurrent clients.
Starting from 3.0 release, *EMQ X* broker fully supports MQTT V5.0 protocol specifications and backward compatible with MQTT V3.1 and V3.1.1, as well as other communication protocols such as MQTT-SN, CoAP, LwM2M, WebSocket and STOMP. The 3.0 release of the *EMQ X* broker can scaled to 10+ million concurrent MQTT connections on one cluster.
Starting from 3.0 release, *EMQX* broker fully supports MQTT V5.0 protocol specifications and backward compatible with MQTT V3.1 and V3.1.1, as well as other communication protocols such as MQTT-SN, CoAP, LwM2M, WebSocket and STOMP. The 3.0 release of the *EMQX* broker can scaled to 10+ million concurrent MQTT connections on one cluster.
%%LOGO%%
# How to use this image
### Run emqx
### Run EMQX
Execute some command under this docker image
@ -22,11 +22,11 @@ For example
$ docker run -d --name emqx -p 18083:18083 -p 1883:1883 %%IMAGE%%:latest
```
The emqx broker runs as linux user `emqx` in the docker container.
The EMQX broker runs as Linux user `emqx` in the docker container.
### Configuration
Use the environment variable to configure the EMQ X docker container.
Use the environment variable to configure the EMQX docker container.
By default, the environment variables with `EMQX_` prefix are mapped to key-value pairs in configuration files.
@ -59,30 +59,30 @@ EMQX_HOST
These environment variables will ignore for configuration file.
#### EMQ X Configuration
#### EMQX Configuration
> NOTE: All EMQ X Configuration in [etc/emqx.conf](https://github.com/emqx/emqx/blob/master/etc/emqx.conf) could config by environment. The following list is just an example, not a complete configuration.
> NOTE: All EMQX Configuration in [`etc/emqx.conf`](https://github.com/emqx/emqx/blob/master/apps/emqx/etc/emqx.conf) can be configured via environment variables. The following list is just an example, not a complete configuration.
| Options | Default | Mapped | Description |
|-------------|----------------|--------|----------------------------|
| `EMQX_NAME` | container name | none | emqx node short name |
| `EMQX_HOST` | container IP | none | emqx node host, IP or FQDN |
| `EMQX_NAME` | container name | none | EMQX node short name |
| `EMQX_HOST` | container IP | none | EMQX node host, IP or FQDN |
The list is incomplete and may changed with [etc/emqx.conf](https://github.com/emqx/emqx/blob/master/etc/emqx.conf) and plugin configuration files. But the mapping rule is similar.
The list is incomplete and may be changed with [`etc/emqx.conf`](https://github.com/emqx/emqx/blob/master/apps/emqx/etc/emqx.conf) and plugin configuration files. But the mapping rule is similar.
If set `EMQX_NAME` and `EMQX_HOST`, and unset `EMQX_NODE_NAME`, `EMQX_NODE_NAME=$EMQX_NAME@$EMQX_HOST`.
For example, set mqtt tcp port to 1883
For example, set MQTT TCP port to 1883
```console
$ docker run -d --name emqx -e EMQX__LISTENERS__TCP__DEFAULT__BIND=1883 -p 18083:18083 -p 1883:1883 %%IMAGE%%:latest
```
#### EMQ Loaded Modules Configuration
#### EMQX Loaded Modules Configuration
| Options | Default | Description |
|-----------------------|-------------------|-----------------------------|
| `EMQX_LOADED_MODULES` | see content below | default modules emqx loaded |
| `EMQX_LOADED_MODULES` | see content below | default EMQX loaded modules |
Default environment variable `EMQX_LOADED_MODULES`, including
@ -105,11 +105,11 @@ EMQX_LOADED_MODULES="emqx_mod_delayed emqx_mod_rewrite"
EMQX_LOADED_MODULES="emqx_mod_delayed | emqx_mod_rewrite"
```
#### EMQ Loaded Plugins Configuration
#### EMQX Loaded Plugins Configuration
| Options | Default | Description |
|-----------------------|-------------------|-----------------------------|
| `EMQX_LOADED_PLUGINS` | see content below | default plugins emqx loaded |
| `EMQX_LOADED_PLUGINS` | see content below | default EMQX loaded plugins |
Default environment variable `EMQX_LOADED_PLUGINS`, including
@ -136,9 +136,9 @@ EMQX_LOADED_PLUGINS="emqx_retainer emqx_rule_engine"
EMQX_LOADED_PLUGINS="emqx_retainer | emqx_rule_engine"
```
#### EMQ X Plugins Configuration
#### EMQX Plugins Configuration
The environment variables which with `EMQX_` prefix are mapped to all emqx plugins' configuration file, `.` get replaced by `__`.
The environment variables which with `EMQX_` prefix are mapped to all EMQX plugins' configuration file, `.` get replaced by `__`.
Example:
@ -147,17 +147,17 @@ EMQX_RETAINER__STORAGE_TYPE <--> retainer.storage_type
EMQX_RETAINER__MAX_PAYLOAD_SIZE <--> retainer.max_payload_size
```
Don't worry about where to find the configuration file of emqx plugins, this docker image will find and config them automatically using some magic.
Don't worry about where to find the configuration file of EMQX plugins, this docker image will find and configure them automatically using some magic.
All plugin of emqx project could config in this way, following the environment variables mapping rule above.
All EMQX plugins can be configured this way, following the environment variables mapping rule above.
Assume you are using redis auth plugin, for example:
Assume you are using Redis auth plugin, for example:
```bash
#EMQX_RETAINER__STORAGE_TYPE = "ram"
#EMQX_RETAINER.MAX_PAYLOAD_SIZE = 1MB
docker run -d --name emqx -p 18083:18083 -p 1883:1883 -p 4369:4369 \
docker run -d --name emqx -p 18083:18083 -p 1883:1883 \
-e EMQX_LISTENERS__TCP__DEFAULT=1883 \
-e EMQX_LOADED_PLUGINS="emqx_retainer" \
-e EMQX_RETAINER__STORAGE_TYPE = "ram" \
@ -170,24 +170,24 @@ For numbered configuration options where the number is next to a `.` such as:
- backend.redis.pool1.server
- backend.redis.hook.message.publish.1
You can configure an arbitrary number of them as long as each has a uniq unber for it's own configuration option:
You can configure an arbitrary number of them as long as each has a unique number for its own configuration option:
```bash
docker run -d --name emqx -p 18083:18083 -p 1883:1883 -p 4369:4369 \
-e EMQX_BACKEND_REDIS_POOL1__SERVER=127.0.0.1:6379 \
[...]
-e EMQX_BACKEND__REDIS__POOL5__SERVER=127.0.0.5:6379 \
-e EMQX_BACKEND__REDIS__HOOK_MESSAGE__PUBLISH__1='{"topic": "persistant/topic1", "action": {"function": "on_message_publish"}, "pool": "pool1"}' \
-e EMQX_BACKEND__REDIS__HOOK_MESSAGE__PUBLISH__2='{"topic": "persistant/topic2", "action": {"function": "on_message_publish"}, "pool": "pool1"}' \
-e EMQX_BACKEND__REDIS__HOOK_MESSAGE__PUBLISH__3='{"topic": "persistant/topic3", "action": {"function": "on_message_publish"}, "pool": "pool1"}' \
-e EMQX_BACKEND__REDIS__HOOK_MESSAGE__PUBLISH__1='{"topic": "persistent/topic1", "action": {"function": "on_message_publish"}, "pool": "pool1"}' \
-e EMQX_BACKEND__REDIS__HOOK_MESSAGE__PUBLISH__2='{"topic": "persistent/topic2", "action": {"function": "on_message_publish"}, "pool": "pool1"}' \
-e EMQX_BACKEND__REDIS__HOOK_MESSAGE__PUBLISH__3='{"topic": "persistent/topic3", "action": {"function": "on_message_publish"}, "pool": "pool1"}' \
[...]
-e EMQX_BACKEND__REDIS__HOOK_MESSAGE__PUBLISH__13='{"topic": "persistant/topic13", "action": {"function": "on_message_publish"}, "pool": "pool1"}' \
-e EMQX_BACKEND__REDIS__HOOK_MESSAGE__PUBLISH__13='{"topic": "persistent/topic13", "action": {"function": "on_message_publish"}, "pool": "pool1"}' \
%%IMAGE%%:latest
```
### Cluster
EMQ X supports a variety of clustering methods, see our [documentation](https://docs.emqx.io/broker/latest/en/advanced/cluster.html#emqx-service-discovery) for details.
EMQX supports a variety of clustering methods, see our [documentation](https://www.emqx.io/docs/en/latest/deploy/cluster/intro.html) for details.
Let's create a static node list cluster from docker-compose.
@ -242,7 +242,7 @@ Let's create a static node list cluster from docker-compose.
### Persistence
If you want to persist the EMQ X docker container, you need to keep the following directories:
If you want to persist the EMQX docker container, you need to keep the following directories:
- `/opt/emqx/data`
- `/opt/emqx/etc`
@ -270,18 +270,18 @@ services:
EMQX_HOST: 127.0.0.1
volumes:
- vol-emqx-data:/opt/emqx/data
- vol-emqx-etc:/opt/emqx/etc
- vol-emqx-log:/opt/emqx/log
```
### Kernel Tuning
Under linux host machine, the easiest way is [Tuning guide](https://docs.emqx.io/en/broker/latest/tutorial/tune.html#linux-kernel-tuning).
Under Linux host machine, the easiest way is [Tuning guide](https://www.emqx.io/docs/en/latest/deploy/tune.html).
If you want tune linux kernel by docker, you must ensure your docker is latest version (>=1.12).
If you want tune Linux kernel by docker, you must ensure your docker is latest version (>=1.12).
```bash
docker run -d --name emqx -p 18083:18083 -p 1883:1883 -p 4369:4369 \
docker run -d --name emqx -p 18083:18083 -p 1883:1883 \
--sysctl fs.file-max=2097152 \
--sysctl fs.nr_open=2097152 \
--sysctl net.core.somaxconn=32768 \
@ -300,4 +300,4 @@ docker run -d --name emqx -p 18083:18083 -p 1883:1883 -p 4369:4369 \
%%IMAGE%%:latest
```
> REMEMBER: DO NOT RUN EMQ X DOCKER PRIVILEGED OR MOUNT SYSTEM PROC IN CONTAINER TO TUNE LINUX KERNEL, IT IS UNSAFE.
> REMEMBER: DO NOT RUN EMQX DOCKER PRIVILEGED OR MOUNT SYSTEM PROC IN CONTAINER TO TUNE LINUX KERNEL, IT IS UNSAFE.

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[Discussions](https://github.com/emqx/emqx/discussions) or [Slack](https://slack-invite.emqx.io/)
[Discussions](https://github.com/emqx/emqx/discussions) or [Discord](https://discord.gg/xYGf3fQnES)