Integrating Zabbix with Slack: A Complete Guide to Webhook Setup and Action Automation

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Overview

Zabbix’s built-in notification system alone often isn’t enough for real-time monitoring.
By connecting Slack via a Webhook, you can receive immediate alerts for both incidents and recoveries.

This post provides a practical step-by-step guide for integrating Zabbix 7.4 with Slack Webhooks.
Follow the instructions below to implement a stable and production-ready Slack alert integration.

1. Pre-check

1.1 Allow Outbound Connection

Ensure the Zabbix server can reach hooks.slack.com:443.
If you are behind a firewall or proxy, add an exception for this domain and port.

1.2 Create a Slack Channel and Webhook

• Create a dedicated Slack channel for monitoring.
• Go to Channel Settings → Add App → Incoming Webhooks → Generate a Webhook URL.

1.3 Validate the Webhook

Test the Webhook directly from the Zabbix server:

Replace webhook URL in the command below with the Webhook address generated from Slack, then run it..

# curl -X POST \
  -H 'Content-type: application/json' \
  --data '{"text":"Zabbix → Slack connection test"}' \ 'webhook URL'   -> replace with the actual webhook url

If the message appears in your Slack channel, the Webhook is valid.

2. Add a Global Macro for Zabbix URL

Navigate to Administration → Macros → Add Macro

3. Configure the Slack Media Type

3.1 Add the Webhook Parameter

Go to Alerts → Media Types → Slack → Enable and Edit.
Add a new parameter named webhook_url.

3.2 Remove Unused Parameters

Keep only the following parameters and delete all others:

3.3 Replace the Script

Replace the script content with the minimal Webhook sender below, then click Update.

// Slack Webhook sender (minimal)
try {
  var p = JSON.parse(value);
  var payload = {
    "text": "*" + (p.alert_subject || "Zabbix") + "*\n" + (p.alert_message || "")
  };
  var req = new HttpRequest();
  req.addHeader('Content-Type', 'application/json');
  var resp = req.post(p.webhook_url, JSON.stringify(payload));
  if (req.getStatus() != 200) {
    throw 'Slack webhook response: ' + req.getStatus() + ' ' + resp;
  }
  return 'Message sent successfully to Slack.';
} catch (e) {
  throw 'Failed to send Slack message: ' + e;
}

4. Assign Slack Media to a User

Go to Users → Admin → Media

1. Click Add under “Media”.
2. Type: Slack
3. Send to: Enter any dummy value (e.g., slack).
4. Keep Default checked.
5. Set the severity to Warning or higher.
6. Click Add → Update.

5. Create a Notification Action

5.1 Edit the Trigger Action

Path: Alerts → Actions → Trigger Actions → Report problems to Zabbix administrators

5.2 Add a Condition

• Type: Trigger severity
• Operator: ≥ (is greater thanl or equals)
• Severity: Warning
• Check Enabled and click Add.

5.3 Configure the Operations

1. Edit Operation steps 1
2. Send to User group: Zabbix administrators
3. Send to Media type: Slack
4. Enable Custom message
5. Enter the following:

Problem alert message

- Problem detected: {EVENT.NAME}

--------------------------------------
Time: {EVENT.DATE} {EVENT.TIME}
Severity: {EVENT.SEVERITY}
Host: {HOST.NAME1}
Item: {ITEM.NAME1}
Current value: {ITEM.LASTVALUE1}

Event ID: {EVENT.ID}
Link: {$ZABBIX.URL}/tr_events.php?eventid={EVENT.ID}

5.4 Add a Recovery operations

1. Send User group: Zabbix administrators
2. Send to Media type: Slack
3. Enable Custom message
4. Enter the following:

Recovery alert message

- Resolved: {EVENT.NAME}

--------------------------------------
Recovery time: {EVENT.RECOVERY.DATE} {EVENT.RECOVERY.TIME}
Severity: {EVENT.SEVERITY}
Host: {HOST.NAME1}

Event ID: {EVENT.ID}
Link: {$ZABBIX.URL}/tr_events.php?eventid={EVENT.ID}

6. Save and Apply All Changes

After completing the Action configuration, click Update.
Trigger a test event to verify that Slack messages are received correctly.

✅ Final Checklist

Conclusion

Once configured, Zabbix will automatically send event alerts to the designated Slack channel.
This setup requires no external modules—only the native Webhook and built-in Zabbix features.
It’s simple, reliable, and safe to use even in production environments.

🛠 마지막 수정일: 2025.12.12