Steps for troubleshooting common Linux network faults

Article title: common troubleshooting procedures for Linux networks. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.

At present, Linux is good at application fields: basic server applications for a single application, such as DNS, Web server, NFS server, firewall, file server, proxy server, and small and medium databases. Most Linux network faults are related to server configurations. Next we will introduce the troubleshooting steps.

1. DNS server troubleshooting

The Linux domain name server uses Bind9. The domain name server contains part of the database segment information and can be accessed by customers called the parser. If domain name resolution cannot be performed in a Linux network, it is likely that a valid domain name server is not specified locally. this is usually the case. Most DNS faults are caused by incorrect syntax of the configuration file or wrong address assigned to the computer. To diagnose a DNS fault, follow these steps:

(1) Check all records and confirm the spelling of the host name. remember that the absolute address ends.

(2) If any modification is made to the partition file, you must modify the serial number in the SOA record, which will ensure that the server correctly uploads the file again.

(3) confirm that the name and IP address entered in the primary area match the reverse pointer information in the reverse pointer file.

(4) Check firewall related procedures.

2. Apache server troubleshooting

Apache originated from the NCSAhttpd server and has been modified many times to become one of the most popular Web server software in the world. If a problem occurs on the Apache server, you can perform the following steps:

(Warn) view error logs

The error operation details will be written into the server's error log. This information is often enough for you to diagnose and fix errors (such as file permissions ). The default error log is/usr/local/apache. logs/error_log. However, you can modify the location of the error log by setting the ErrorLog entry in the Apache configuration file.

(FAQ) view FAQs

You can find the connection to the latest FAQ on the Apache Main site page, which lists some common problems. The general FAQ is located at http://httpd.apache.org/docs/misc/faq.html.

View Apache Bug database

The Apache development team stores the Bug reported by the user in the Bug database (http://bugs.apache.org/), where you can find out whether your problem has been listed in it. If the report on this issue is still open, we recommend that you check it periodically. You can also send emails to the problem reporters, because some discussions on this issue may be communicated through letters.

Using the relevant email list or newsgroup

Many problems have never been added to the Bug database because they have frequently appeared in the email list and newsgroups. You can obtain this information at http://httpd.apache.org/userslist.html?news:comp.infosystems.www.servers.unix.

(Failure) if all the above methods fail, please go to the Bug database to report this problem.

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