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In: General, Linux, Monitoring

Initializing n8n process n8n webserver failed, exiting The fix is to add this line -e N8N_LISTEN_ADDRESS=0.0.0.0 In my case, the problem was that IPv6 was disabled in my kernel. Since at least version 1.107.4, the default listen address is ::. sudo docker run -it –rm \ –name n8n \ -e GENERIC_TIMEZONE=”America/New_York” \ -e TZ=”America/New_York” \ -e N8N_ENFORCE_SETTINGS_FILE_PERMISSIONS=false \ -e N8N_RUNNERS_ENABLED=true \ -e N28N_SECURE_COOKIE=false \ -e N8N_METRICS=true \ -e N8N_LISTEN_ADDRESS=0.0.0.0 \ -e QUEUE_HEALTH_CHECK_ACTIVE=true \ -v ./n8n_data:/home/node/.n8n \ docker.n8n.io/n8nio/n8nRead More →

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In: Monitoring, Splunk

Let’s walk through how to extract meaningful fields like IP address, port, error level, and message content from a raw PHP warning log using regular expressions and Splunk’s rex command. Step 1: The Raw Log Here’s a sample of the raw log we’re working with: [client 104.23.211.100:21636] PHP Warning: Cannot assign an empty string to a string offset in /www/website.com/httpdocs/wp-includes/user.php on line 41 From this log, we want to extract: IP Address Port Error Level (e.g., Warning, Notice, etc.) Full message content after the error level Step 2: Crafting the Regex Pattern We used regexr.com to help test and refine our regular expression. After experimenting,Read More →

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In: General, Monitoring

1. Avoid Relying Solely on Email for Alerts Email is not a reliable alerting mechanism. Alerts can be delayed, filtered as spam, or ignored due to cluttered inboxes. From a user experience perspective, email-based alerts are often messy and ineffective. Recommendation: Use a dedicated alerting app or platform that supports webhook integrations. Azure and most modern monitoring tools offer this functionality. These solutions provide more reliable and timely alerting mechanisms. 2. Be Selective and Strategic with Monitors Not all systems or services require immediate alerts. It’s important to evaluate the criticality of each component before creating alerts. Example: If a non-business-critical website goes offline atRead More →

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In: Linux, Monitoring

If you got this error – [inputs.docker] Error in plugin: permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock It’s because /var/run.docker.sock is only accessible by root or anyone in docker group. telegraf is not in this group. The fix is to add telegraf to docker group: usermod -a -G docker telegrafRead More →

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In: General, Monitoring

As you know we can use the variable in some of the format such as : [[variable]]$variable${variable} When upgrading to v10.3.1 , i realize that the variable __interval_ms can’t be used as [[__interval_ms]] , we need to to use it as $__interval_ms as [[]] is going to be depreciated soon, it’s recommended to use the new format. If you have old dashboard and it’s not displaying correctly, check the variable.Read More →

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In: General, Monitoring

Let say you have a load balancer with few thousand sites, the load balancer keeps track the response time from the backend server. Your log is saved in Splunk. Now, the application team comes to you and ask the site performance in the last 30 days. You think it’s easy, yes, when you start with last hour , the results come out within a minute. But when you do last 30 days, it’s a such a pain because the data is too large. Since last one hour seems to be OK, why don’t we dump that result data into some other faster database? Since it’sRead More →

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In: General, Monitoring, Programming

When i use Datadog to collect tracer/span in our PHP , i realize that Datadog library does not collect the client IP address. I don’t know what the reason behind this, but not having the client IP is very hard to troubleshoot the issue. After a while i figured out the way to hack the code. The hack is to modify this file /opt/datadog-php/dd-trace-sources/bridge/_generated.php This is my modification – check the line #================My Customize codeRead More →