Search icon CANCEL
Subscription
0
Cart icon
Your Cart (0 item)
Close icon
You have no products in your basket yet
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Conferences
Free Learning
Arrow right icon
Arrow up icon
GO TO TOP
Troubleshooting CentOS

You're reading from   Troubleshooting CentOS A practical guide to troubleshooting the CentOS 7 community-based enterprise server

Arrow left icon
Product type Paperback
Published in Jun 2015
Publisher
ISBN-13 9781785289828
Length 190 pages
Edition 1st Edition
Tools
Concepts
Arrow right icon
Author (1):
Arrow left icon
Jonathan Hobson Jonathan Hobson
Author Profile Icon Jonathan Hobson
Jonathan Hobson
Arrow right icon
View More author details
Toc

Table of Contents (12) Chapters Close

Preface 1. Basics of Troubleshooting CentOS FREE CHAPTER 2. Troubleshooting Active Processes 3. Troubleshooting the Network Environment 4. Troubleshooting Package Management and System Upgrades 5. Troubleshooting Users, Directories, and Files 6. Troubleshooting Shared Resources 7. Troubleshooting Security Issues 8. Troubleshooting Database Services 9. Troubleshooting Web Services 10. Troubleshooting DNS Services Index

Monitoring network connections with the ss command

The socket statistics command (ss) is the successor to netstat; it is not only faster, but it is also able to display more information. However, unlike netstat, which obtains its information from the various files contained within the /proc directory, the ss command obtains its information directly from the kernel space.

The basic syntax of the ss command is as follows:

# ss | less

Using this syntax, we have simply called for an output of all TCP, UDP, and Unix socket connections with an optional pipe to less in order to ensure that the results can be seen on screen. Of course, this command can be combined with either the -t, -u or, -x option to restrict any output to show either TCP, UDP, or Unix socket connections respectively, but in order to make the output more informative, you will probably want to combine one of these additional options with the -a option in order to report on both connected and listening sockets like this:

# ss -ta...
lock icon The rest of the chapter is locked
Register for a free Packt account to unlock a world of extra content!
A free Packt account unlocks extra newsletters, articles, discounted offers, and much more. Start advancing your knowledge today.
Unlock this book and the full library FREE for 7 days
Get unlimited access to 7000+ expert-authored eBooks and videos courses covering every tech area you can think of
Renews at $19.99/month. Cancel anytime
Banner background image