# Change EMQX Log Level

## Objective

Modify the log level in the EMQX cluster.

## Configure EMQX Cluster

EMQX CRD `apps.emqx.io/v2` supports configuring the log level of the EMQX cluster through `.spec.config.data`. Refer to the [Configuration Manual](https://docs.emqx.com/en/enterprise/v6.0.0/hocon/) for a complete configuration reference.

1. Save the following content as a YAML file and deploy it using `kubectl apply`:

   ```yaml
   apiVersion: apps.emqx.io/v2
   kind: EMQX
   metadata:
     name: emqx
   spec:
     image: emqx/emqx:6.2.0
     config:
       # Enable debug logging:
       data: |
         log.console.level = debug
         license {
           key = "..."
         }
     dashboardServiceTemplate:
       spec:
         type: LoadBalancer
     listenersServiceTemplate:
       spec:
         type: LoadBalancer
   ```

2. Wait for the EMQX cluster to become ready.

   Check the status of the EMQX cluster with `kubectl get` and ensure that `STATUS` is `Ready`. This may take some time.

   ```bash
   $ kubectl get emqx
   NAME   STATUS   AGE
   emqx   Ready    10m
   ```

## Verify Log Level

1. Obtain the External IP of the EMQX cluster.

   ```bash
   external_ip=$(kubectl get svc emqx-listeners -o json | jq '.status.loadBalancer.ingress[0].ip')
   ```

2. Use MQTTX CLI to connect to the EMQX cluster.

   [MQTTX CLI](https://mqttx.app/cli) is an open source MQTT 5.0 command line client tool, designed to help developers start using MQTT services and applications more quickly.

   ```
   $ mqttx conn -h ${external_ip} -p 1883
   [4/17/2023] [5:17:31 PM] › … Connecting...
   [4/17/2023] [5:17:31 PM] › ✔ Connected
   ```

3. View EMQX container logs.

   ```bash
   $ kubectl logs emqx-core-0 -c emqx
   ...
   2023-04-17T09:11:35.993031+00:00 [debug] msg: mqtt_packet_received, mfa: emqx_channel:handle_in/2, line: 360, peername: 218.190.230.144:59457, clientid: mqttx_322680d9, packet: CONNECT(Q0, R0, D0, ClientId=mqttx_322680d9, ProtoName=MQTT, ProtoVsn=5, CleanStart=true, KeepAlive=30, Username=undefined, Password=), tag: MQTT
   2023-04-17T09:11:35.997066+00:00 [debug] msg: mqtt_packet_sent, mfa: emqx_connection:serialize_and_inc_stats_fun/1, line: 872, peername: 218.190.230.144:59457, clientid: mqttx_322680d9, packet: CONNACK(Q0, R0, D0, AckFlags=0, ReasonCode=0), tag: MQTT
   ```