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This article mainly explains "what are the Apache Web Server interview questions?" friends who are interested may wish to have a look. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn "what are the Apache Web Server interview questions?"

1. How do I stop / start the Apache Web server?

You can restart and execute the apachectl script by going to the Apache instance location > > bin folder.

. / apachectl stop./apachectl start replication

You can also use the script in / etc/init.d/. It is usually named "apache" or "httpd"

/ etc/init.d/apache stop/etc/init.d/apache start replication

Another process is to use services

Httpd stopservice httpd start

2. What is the default port for HTTP and HTTPS?

The default ports for HTTP are 80 and HTTPS443. Click here to get the default ports that list other applications in detail.

3. Can you tell me the name of the important configuration file?

Httpd.conf is the main configuration file used in Apache.

4. How do I check the running version of Apache Web Server?

There are several ways to find this method, but more accurately:

(1) Log in to the Web server

(2) go to apache instance and bin folder

(3) execute httpd with-v to get version details

[root@lab sbin] # / httpd-vServer version: Apache/2.2.15 (Unix) Server built: Jul 18 2016 15:24:00 [root@lab sbin] #

Alternatively, you can use the rpm command to check the installed version. Get referenc

[root@lab ~] # rpm-qa | grep httpdhttpd-2.2.15-54.el6.centos.x86_64httpd-tools-2.2.15-54.el6.centos.x86_64 [root@lab ~] #

5. How do I know if the Web server is running?

There are many ways to find it.

(1) Log in to the Web server and perform the "httpd" processing of grep

Ps-ef | grep httpd replication

(2) check the monitoring dashboard for any alerts. (3) check that your apache IP:port can be accessed in the browser. (4) use netstat to check whether the configured IP and port are listening on the server.

Netstat-anlp | grep 80

6. How do I install Apache HTTP?

There are three possible ways to install this program. Click here for more information on JAVA middleware.

(1) use source code-you can download the source code and compile it.

Download the latest version from http://httpd.apache.org/download.cgi using the tar utility or the gzip utility to extract the source, depending on the file type: .tar or .tar.gz

Tar xvf httpd-1.2.3.targzip-d httpd-1.2.4.tar.gz

Navigate to the location of the extraction source through the cd command, and. / configure is configured on the terminal using the command, and then compiled using the make command. Finally, use the make install command to install. If you want to find more options on how to configure it, you can use the configure-- help command.

(2) YUM repository

If your server is connected to Internet or has an internal repository, you can install it using yum. Reference tutorial

Yum install httpd

(3) RPM

You can download the necessary RPM packages and use the rpm command.

Rpm-ivh packagename.rpm

7. How do I ensure that Apache listens for only one IP address on the server?

This is usually required when there is more than one IP on the server. To ensure that Apache listens on only the specified IP, the IP and port need to be explicitly mentioned in the Listen directive.

For example:

Listen 10.10.10.10:80

8. How do I ensure that Apache runs as a non-root user / nobody user?

This can be achieved by adding a User&Group directive to the httpd.conf file

User apacheGroup apache

The above configuration example will ensure that it starts with the "apache" user. Before you configure the server, you must ensure that users exist on the server.

9. How do I disable directory indexing?

You can use "Options-Indexes" in the corresponding directory directive. For example:

Options-Indexes

10. Which module needs to be redirected?

Mod_rewrite is responsible for redirecting and must uncomment in the httpd.conf file.

LoadModule rewrite_module modules/mod_rewrite.so

11. Can you change the listening port from the default port to another port?

Yes, you can do this by specifying the port number in the Listen instruction. For example: have Apache listen for the 10.10.10.10 IP address on port 9000.

Listen 10.10.10.10:9000

twelve。 How do I protect a website hosted on Apache Web Server?

There are several ways to secure Apache Web servers, including the following.

(1) implement SSL

(2) Integration with WAF (Web application firewall) (such as ModSecurity, etc.)

(3) use cloud-based security providers

13. What log files does Apache generate?

Two popular log files are created.

Access.log-all request details and status codes

Error.log-catch all errors in apache or connecting to the backend

14. How to create an enterprise CSR?

You can use the following OpenSSL command or generate CSR online.

Openssl req-out geekflare.csr-newkey rsa:2048-nodes-keyout geekflare.key

15. What is a virtual host?

Virtual hosts in Apache allow you to host multiple Web sites on a single instance. You can create IP-based or virtual host-based names.

16. What modules are required to connect to WebSphere?

Mod_was_ap22_http.so must be added as an httpd.conf file to integrate with IBM WAS.

17. How do I put the log level in debug mode?

You usually need to use it when you troubleshoot a problem and want to capture more details. You can change the logging level for debugging by ensuring the following in the httpd.conf file.

LogLevel debug

18. Which module is required to enable SSL?

Before implementing SSL, you must uncomment the mod_ssl module.

LoadModule auth_basic_module modules/mod_ssl.so

19. What is the name of the WebLogic module?

Mod_wl_22.so

20. What are the log levels available in Apache?

The default configuration setting is "warn", but you can also do the following.

Debugging message warning pay attention to critical strike alarm energy error

21. What is DocumentRoot?

The DocumentRoot directive is a configuration in which you can specify the folder location from which static files will be provided. Also known as WebRoot.

Default DocumentRoot location is / var/www/html

twenty-two。 How do I deploy war or JAVA applications in Apache?

Apache is a Web server, and it cannot deploy Java-based applications. However, you can integrate Java application servers, such as WebLogic,WebSphere and JBoss, where you can deploy war,ear files. Click here to see more

23. What is the difference between Apache Web server and Apache Tomcat?

Apache Web is the HTTP server used to provide static content, where Tomcat is the servlet container used to deploy JSP files.

You can always * * integrate Apache HTTP with Tomcat, but you can choose one of them as needed. If you need the appropriate Web server, you can use the Tomcat of the Apache HTTP or JSP-Servlet container.

24. How does Apache act as a proxy server?

You can use the mod_proxy module as a proxy server. The mod_proxy module can be used to connect to a back-end server, such as Tomcat,WebLogic,WebSphere, etc.

25. How do I configure the Apache log to capture the time spent on a service request? **

You can add "% D" to the httpd.conf file under the LogFormat directive to capture the response time taken to respond to the request. It will display the time in milliseconds.

LogFormat "% h% l% u% t\"% r\ "% > s% b\"% {Referer} I\ "\"% {User-Agent} I\ "% D" combined

Restart the Apache Web server and you can see the results.

182.19.197.23-[02/Oct/2016:10:32:25 + 0000] "GET / HTTP/1.1" 403 4961 "-" Mozilla/5.0 (Macintosh) Intel Mac OS X 10 / 11 / 6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36 "1515182.19.197.23-[02/Oct/2016:10:32:25 + 0000]" GET / icons/apache_pb.gif HTTP/1.1 "304 -" http://lab.geekflare.com/"Mozilla/5.0 (Macintosh) Intel Mac OS X 10 / 11 / 6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36 "424182.19.197.23-[02/Oct/2016:10:32:25 + 0000]" GET / icons/poweredby.png HTTP/1.1 "304 -" http://lab.geekflare.com/"Mozilla/5.0 (Macintosh) Intel Mac OS X 10 / 11 / 6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36 "472

twenty-six。 What tools do you use for log analysis?

You can use many tools such as GoAccess,SumoLogic.

twenty-seven。 Which Web servers have you used with Apache?

There are many Web servers on the market, you can choose to be familiar with them, such as Nginx.

twenty-eight。 How do I verify the httpd.conf file to ensure that there are no configuration syntax errors?

Httpd-t will help you check the syntax.

[root@lab httpd] # / usr/sbin/httpd-tSyntax OK [root@lab httpd] #

Alternatively, you can use the apachectl command.

[root@lab ~] # / usr/sbin/apachectl configtestSyntax OK [root@lab ~] #

twenty-nine。 How do I perform the Apache performance benchmark?

You can use tools such as ApacheBench,SIEGE to perform load tests on Web servers, including Apache. Another option for performing stress tests online to see the overall performance of the Web application under load.

thirty。 If there is a problem, how do I get support for Apache Web Server?

Apache is an open source Web server, so there is no enterprise support. However, you can report errors or ask questions about stack overflows.

thirty-one。 How to ensure that the Web server starts after the server is restarted?

If you are running Linux, you can put the script in / etc/init.d/ and use the chkconfig command to enable startup

Suppose you create a file called apache and put it under / etc/init.d

Chkconfig-add apachechkconfig apache on

If you are on Windows, make sure that the startup type is selected as automatic.

thirty-two。 What is the difference between Apache and Nginx Web servers?

Both are classified as Web servers, which are some of the main differences.

(1) Nginx is an event-based Web server, where Apache is process-based

(2) Nginx is known for its better performance than Apache

(3) Apache supports Nginx operating systems that do not support OpenVMS and IBMi.

(4) Apache has integrated a large number of modules with the back-end application servers that Nginx is still catching up with.

(5) Nginx is lightweight and can quickly capture market share.

thirty-three。 How do you kill Apache if it doesn't work properly?

If you are running on Linux, you can use the kill command. Use ps-ef | grep http to find the PID of Apache, and then kill it.

Kill $PIDNUMBER

If the normal kill does not work, try killing-9

Kill-9$ PIDNUMBER

If on Windows, the Apache task ends from the Task Manager.

thirty-four。 If you don't know the installation location, how do you find the httpd.conf file?

In Linux, you can use the find command.

Assuming you know it must be in the / apps file system, you can use the following command.

Find / apps-name httpd.conf

However, if you are not sure which file system, you can find it on the / file system, but keep in mind that depending on the overall size of the file system, it can take a long time.

Find /-name httpd.conf

thirty-five。 Do you know what different styles Apache Web servers have?

(1) IBM HTTP Server-is called IHS and is usually used with IBM WebSphere Application Server

(2) Oracle HTTP Server- is called OHS and is usually used with Oracle Weblogic servers

thirty-six。 Where is Apache located in the data center?

You can explain it based on your own experience, but usually for Internet-oriented applications, it should be in the Internet DMZ network as well as in the Intranet, the core network.

But this will vary from application to application / organization.

thirty-seven。 How do I hide the server version details in the HTTP response header?

Add the following to the httpd.conf file, and then restart the Web server

ServerTokens ProdServerSignature Off

This hides the version and displays the server as Apache only.

thirty-eight。 What do 200,403 and 503 HTTP error codes mean?

200-find the content and put it

403-attempt to access restricted files / folders

503-the server is too busy to process requests, in other words, the service is not available

thirty-nine。 How do I disable tracking HTTP requests?

Add the following to the httpd.conf file, and then restart the instance

TraceEnable off

forty。 How to resolve port conflicts?

Netstat is useful for resolving port conflicts. If you are running multiple instances on a single server, it is recommended that you configure absolute IP:Port for listening instructions.

forty-one。 How do I install third-party modules?

You can use Apache Toolbox. After downloading, use the tar utility to extract it.

Tar-xf Apachetoolbox-1.5.72.tar.gz

Apachetoolbox-1.5.72 uses the cd command to navigate to this folder, and then runs the following command to select a module for your Apache server.

. / install.sh

It provides modules that mod_ip_forwarding,mod_auth_mysql and mod_auth_samba compile with the Apache Web server. Although you can include these modules manually, it is easier to use Apache Toolbox.

forty-two。 How do I assign multiple names to a virtual host?

You can use the instructions shown below in ServerAlias.

ServerName example.comServerAlias awesome.com fantastic.com

forty-three。 How to limit the upload size?

I have a Web application that allows users to upload files, such as Word documents, pdf, etc. How to restrict users from uploading files?

You can use the LimitRequestBody directive to limit the size of the uploaded file.

LimitRequestBody 9000

The value assigned to LimitRequestBody allows Apache to accept and store 9000 bytes of files uploaded by the user. You can adjust the value as needed.

forty-four。 How do I restrict IP access?

You may want some context roots to be accessible by the allowed IP. To do this, you can use the mod_authz_core or mod_authz_host module to restrict access using the Require directive.

Require 10.0.0.2 10.0.0.4 192.168.34.23 192.168.34.23

With the above operation, the Apache will process the request only if it comes from the listed IP.

You need Require to specify instructions in the directory to allow or deny access to resources.

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