A Complete Guide of 'ss' Command Output Metrics - TCP Connection Inspecting Tool

labile.zhu@gmail.com (Mark Zhu) — Sun, 10 Sep 2023 01:12:15 +0800

Introduction

Understanding metrics from Linux ss command output.

I am not a network expert, but after years of troubleshooting network problems in production and test environments, I no longer want to muddle through, so I record what I have learned. Due to limited understanding of TCP stack implementation, the content is for reference only.

ss is a perfect tool to inspect TCP connection level statistics. But it is not well-documented. This article tries to explain the output of ss and how to read the metrics from the ss output.

BPF tracing istio/Envoy - Part4: Upstream/Downstream Event-Driven Collaboration of Envoy@Istio

labile.zhu@gmail.com (Mark Zhu) — Thu, 07 Apr 2022 16:12:15 +0900

Notice: The original article come from https://blog.mygraphql.com/en/posts/low-tec/trace/trace-istio/trace-istio-part4/ . If picture unclear, please redirect to the original article.

There is Chinese version too.

Why

I can’t believe that I really insisted on writing Part 4. Believe it or not, the “Why” section of each part is the hardest thing to write :) . If you’re reading this series for the first time, don’t worry, each section is relatively independent.

Introduction to Envoy you have saw earlier describes envoy’s features like this:

Kernel on Mark Zhu's Blog

A Complete Guide of 'ss' Command Output Metrics - TCP Connection Inspecting Tool

Introduction

BPF tracing istio/Envoy - Part4: Upstream/Downstream Event-Driven Collaboration of Envoy@Istio

Why