October 2015
Intermediate to advanced
458 pages
10h 49m
English
Content preview from Red Hat Enterprise Linux Troubleshooting GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Summary
In this chapter, we experienced what seemed like a simple networking issue with our blog application connecting to its database. In our data collection phase, we used commands such as netstat and tcpdump to inspect the network packets and quickly discovered that the blog server was receiving an ICMP packet indicating that the database server is rejecting the blog server's TCP packets.
From that point, we suspected the issue was a firewall issue, which after investigating with the iptables command we noticed that the firewall rules were out of order.
Afterwards, we were able to use the trial and error stage to resolve the issue. This specific issue is a very common issue, something that I personally have seen in many different environments. ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.