Although the Linux system is very powerful, stable, but we use the process, if the human operation is not appropriate, will still affect the system, and may even make the system does not boot, unable to run services and other problems. Then this blog post summarizes some common troubleshooting methods, but it is impossible to cover all, can only continue to supplement, update.first, the administrator forgot the password(1), restart the computer, enter
PHP cannot obtain Referer for troubleshooting and referer for troubleshooting. PHP cannot obtain Referer troubleshooting. referer troubleshooting test results :? Phpecho Test Source: directly load the page br; echoahreftest_cookie.php enter the page abr; echo test source PHP cannot obtain Referer
Network troubleshooting and viewing in linux, and network troubleshooting in linux
Basic troubleshooting errors
Troubleshooting must be simple and complex. Some people repeatedly configure the above files, but they cannot access the network. They always think that the system is faulty and want to reinstall the host. Th
MySQL redo deadlock troubleshooting and troubleshooting process analysis, mysqlredo
Problem background
I went to work on Monday. I first asked my colleagues about the test results last week. I was told that MySQL Server hang is in multiple instance scenarios and cannot be tested. The native version does not have this problem, this problem occurs in the new version, so I cannot help but feel at ease. I feel
Chapter 8 JVM performance monitoring and troubleshooting tools (2), jvm troubleshooting
Note: This blog is mainly recorded in "deep understanding of Java Virtual Machine (version 2)"
Note: For details about JVM performance monitoring and troubleshooting tools on the command line, see Chapter 7 JVM performance monitoring and t
Details of several common troubleshooting methods for routers, and details of several troubleshooting methods1. Serial Port troubleshooting
When a connectivity problem occurs in the serial port, in order to eliminate the serial port fault, the show interface serial command is generally used to analyze its screen output report content and locate the problem. The s
Atitit. troubleshooting series ----- troubleshooting when apache cannot be started, atitit ----- apache
Atitit. troubleshooting series ----- troubleshooting when apache cannot be started
You can directly use cli to start httpd and print out detailed information ..
C: \ Users \ ASIMO> "C: \ wamp \ apache2 \ bin
For a one-time troubleshooting page 502, page 502 troubleshooting
First, Scene: System Deepin 15;php 5.5.33;nginx 1.9.9
Second, the situation: simple page output normal (such as phpinfo ();), run any of the company's projects, are 502
Third, the investigation
1, query various logs, including Nginx.error.log, Php_error.log, Php-fpm.error.log, find PHP-FPM error as follows
[22-mar-2016 11:06:32] WARNING: [Po
Atitit. troubleshooting series ----- troubleshooting when apache cannot be started
Atitit. troubleshooting series ----- troubleshooting when apache cannot be started
You can directly use cli to start httpd and print out detailed information ..
C: \ Users \ ASIMO> "C: \ wamp \ apache2 \ bin \ httpd.exe"
Httpd.exe: S
Analysis of troubleshooting and troubleshooting
Definition:N ordered elements should have n! . If an arrangement does not place all elements in the original position, it is called an incorrect arrangement. Let's give an n, and find the number of "D" for "1, 2, 3", "...", and give all the error troubleshooting solutions.
Reasoning:
Step 1: place the nth element i
High-load Mysql troubleshooting and mysql troubleshooting
Troubleshooting of Mysql high load
Problems Found The top command checks the server load and finds that mysql has 200% of the cpu, which causes the high load of Mysql. It is estimated that it is caused by index problems and some abnormal SQL statements.Troubleshooting 1. determine the type of high load. T
Linux system-network basic configuration and troubleshooting, and linux basic configuration troubleshooting
In linux, there are three types of network configuration: one is to directly implement the configuration file using command lines on the terminal, and the other is to modify the configuration file, another method is setup text interface settings.
The difference is that after the configuration file is
Although the Linux system is very powerful, stable, but we use the process, if the human operation is not appropriate, will still affect the system, and may even make the system does not boot, unable to run services and other problems. Then this blog post summarizes some common troubleshooting methods, but it is impossible to cover all, can only continue to supplement, update.first, the administrator forgot the password(1), restart the computer, enter
Troubleshooting of common mysql errors and troubleshooting of mysql errors
1. mysql service cannot be started and error 1067 is reported
Solution:1). decompress the mysql Server Directory and add a new my. ini file. The content is as follows:
[Mysqld] # set basedir to installation path, e.g ., c:/mysql # set it to the installation directory basedir = c:/tool/mysql5617win32 # set datadir to location of data
Linux troubleshooting case (1): linux troubleshooting
Running Environment: CentOS6.7
Fault Cause:
Yesterday, the command yum-y update was executed online. The command was forcibly interrupted and the poweroff command was run to shut down. If a fault occurs during reboot:
According to the prompt information analysis, the system kernel information may be disordered due to the incomplete execution of the
Online troubleshooting commands-Shell, online troubleshooting-shell
Creation: Liu Xinyu, latest modification: about 4 hours ago
Go to metadata start 1. Track online logs and regularly refresh the latest content
tail-fn 200 $log
2. Search for a specified string
# Show only matching rowsgrep$String $file# Match up or down n rows of the row where the string is locatedgrep-C n $String $
BTrace: Java online troubleshooting tool, btrace troubleshooting
What is BTrace?
BTrace is a killer for checking and solving online problems. BTrace can obtain all information during program execution by writing scripts. Note that you do not need to restart the service. Yes, you do not need to restart the service. Write the script and run it directly without the code of the original program.
Principle
In ge
The local computer cannot start Apache troubleshooting and apache troubleshooting
Recently, due to work needs, I have to learn the basic programming of PHP, so I learned how to set up the working environment of PHP.
However, as described in the textbook, after WMAP is installed, it cannot run successfully. Then we found that Apache has never been running. Go to the Apache option in WMAP to select start but
Jvm memory growth troubleshooting examples and jvm troubleshooting examplesTroubleshoot jvm memory Growth
Troubleshoot the problem that the jvm memory usage continues to increase. record it and take it as a warning.
The O M team found that the jvm memory usage of the application fell back after the release and continued to increase. After dumping, it analyzed:
Public
The bean Generation Code must be mult
Java virtual machine performance monitoring and troubleshooting tools, virtual machine troubleshooting
1. jdk command line tool
1) jps: Virtual Machine Process status Tool
Jps [option] [hostid]
Main parameters:
2) jstat: Virtual Machine statistics monitoring tool
Jstat-
Main parameters:
For example, if the gc information of process 8675 is queried twice every 8675 ms, jstat-gc 1000 2
3) jinfo: Java conf
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