What is the diagnostic method of Linux system?

This article introduces the relevant knowledge of "what is the diagnostic method of Linux system". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

First, Linux startup and login problem 1. Ultra-detailed system startup and landing exception troubleshooting point

What if the contents of the 2.grub.conf file are emptied?

3. Skillfully use strace to find missing files

4. Be careful that PAM won't let you log in.

I found out the reason why the 5.CentOS login is stuck.

Second, Linux performance problems 1. Find the "culprit" of Linux virtual machine Load Gao

Who triggered the 2.OOM killer?

3. Where's my server memory?

One of the reasons why the 4.CPU occupies less but the network performance is poor.

5. An IO exception capture process

Third, Linux host network problems 1.ifdown ifup command loss handling

two。 The network doesn't work? Strace made a second shot.

Summary of the discussion of 3.TIME_WAIT & CLOSE_WAIT

4. A classic case study of network jitter

IV. The problem of Linux system service and parameters 1.4 limits entry into force

Step 2.6 to find out the reasons for the differences in ss& netstat statistical results

3. Why can't the java program apply for memory even though there is plenty of memory?

4. Please do not ignore the settings of min_free_kbytes

Fifth, the final experience of the evolution and optimization of the mask project in a certain area.

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