You can restart by going to Apache instance location >> bin folder and execute apachectl script.
You may also use script located in /etc/init.d/. Mostly it will be named either “apache” or “httpd”
Another procedure would be using services
service httpd start
Yes, it’s possible by specifying the port number in Listen directive.
For ex: to make Apache listen on 9000 port to 10.10.10.10 IP address.
httpd.conf is the main configuration file used in Apache.
You can use a mod_proxy module to use as a proxy server. The mod_proxy module can be used to connect to the backend server like Tomcat, WebLogic, WebSphere, etc.
You can use “Options -Indexes” in respective directory directive.
There is multiple ways to find this but more accurately would be;
- Login to web server
- Go to apache instance and bin folder
- Executed httpd with -v to get the version details.
[root@lab sbin]# ./httpd -v
Server version: Apache/2.2.15 (Unix)
Server built: Jul 18 2016 15:24:00
Alternatively, you can also use the rpm command to check the installed version:
[root@lab ~]# rpm -qa |grep httpd
You can either use the following OpenSSL command or generate CSR online.
To create new CSR with private key
openssl req -out geekflare.csr -newkey rsa:2048 -nodes -keyout geekflare.key
Check out OpenSSL cheat sheet for more commands.
I am afraid, Apache is a Web Server and Java based application deployment is not possible with it. However, you can integrate Java application server like WebLogic, WebSphere, JBoss where you can deploy war, ear files.
Add the following in httpd.conf file and restart the instance
This is often needed when you have multiple IPs on the server. In order to ensure Apache listen only on specified IP then you need to explicitly mention IP and port in Listen directive.
This is doable by adding User & Group directive in httpd.conf file
- User apache
- Group apache
Above configuration example will ensure it starts with “apache” user. You must ensure user exist on the server before configuring it.
If running Linux, then you can put a script in /etc/init.d/ and enable to start on boot using chkconfig command
Let’s say you create a file called apache and put under /etc/init.d
chkconfig –add apache
chkconfig apache on
if on Windows, then ensure startup type is selected “Automatic”
In Linux, you can use find command.
Let’s assume, you know it must be in /apps file system then you can use the following command.
find /apps -name httpd.conf
But if you are not sure on which file system then you can do find on / file system but keep it in mind it may take a long time based on the overall file system size.
find / -name httpd.conf
Apache is an Open Source web server so there is no enterprise level support however, you can raise a bug report or ask a question on Stack Overflow.
Add the following in httpd.conf file and restart the web server
This will hide the version and show Server as “Apache” Only.
There are three possible ways to get this installed.
Using source code – you can download the source and compile it.
YUM repository – if your server is connected to the Internet or have internal repository then you can use yum to install it.
yum install httpd
RPM – You can download the necessary RPM package and use rpm command.
rpm -ivh packagename.rpm
There are multiple ways to find this.
- Login to web server and grep for “httpd” process
ps -ef |grep httpd
- Check for any alert in your monitoring dashboard.
- Check if your apache IP:port is accessible in the browser
- Check if configured IP and port is listening on the server with netstat
netstat -anlp |grep 80
You can use a tool like ApacheBench, SIEGE to perform the load test on web servers including Apache. Another option to perform stress test online to see the overall how web application performs under load.
Often needed when you are troubleshooting the issue and wish to capture more details. You can change the logging level to debug by ensuring the following in httpd.conf file.
There are multiple ways to secure the Apache web server including the following.
- Implementing SSL
- Integrating with WAF (Web Application Firewall) like ModSecurity, etc.
- Using cloud-based security provider
netstat would be useful to troubleshoot the port conflict issue. If running multiple instances on a single server then it would be recommended to have absolute IP:Port configured in Listen directive.
httpd –t will help you to verify the syntax.
[root@lab httpd]# /usr/sbin/httpd -t
Alternatively, you may use apachectl command as well.
[root@lab ~]# /usr/sbin/apachectl configtest
If running on Linux, then can use kill command.
Find out the PID of Apache by using ps -ef |grep http
Then kill it
if normal kill doesn’t work then try kill -9
kill -9 $PIDNUMBER
if on Windows, then end the apache task from Task Manager.
IBM HTTP Server – known as IHS and often used with IBM WebSphere Application Server
Oracle HTTP Server- known as OHS often used with Oracle Weblogic server
There are two popular log files created;
access.log – all request details with the status code.
error.log – capture all the errors within apache or connecting in backend.
The default configuration is set to “warn” however, the following is possible too.
Again, you better tell the truth but to make you aware there are many web servers in the market including the following.
- Microsoft IIS
- 200 – content found and served OK
- 403 – tried to access restricted file/folder
- 503 – server is too busy to serve the request and in another word – service unavailable.
Both are categorized as a Web Server and here are some of the main differences.
- Nginx is event-based web server where Apache is process based
- Nginx is known for better performance than Apache
- Apache supports wide range of OS where Nginx doesn’t support OpenVMS and IBMi
- Apache has large number of modules integration with backend application server where Nginx is still catching up
- Nginx is lightweight and capturing the market share rapidly. If you are new to Nginx then you may be interested to check out my articles on Nginx.
DocumentRoot directive is the configuration where you can specify the folder location from where the static files will be served. It’s also called as Web Root.
Default DocumentRoot location is /var/www/html
The default port for HTTP is 80 and HTTPS 443. Checkout default ports for other applications listed here.
Virtual Hosting in Apache allows you to host multiple websites on a single instance. You can either create IP based or Name based in virtual hosting.
mod_was_ap22_http.so must be added in httpd.conf file to integrate with IBM WAS.
You got to speak the truth but to given you an idea you can use GoAccess, SumoLogic or few mentioned here.
Apache Web is HTTP server to serve static contents where Tomcat is servlet container to deploy JSP files.
You can always integrate Apache HTTP with Tomcat, however, based on the requirement you need to choose either one. If you need proper web server then Apache HTTP else Tomcat for JSP-Servlet Container.
You can explain based on your experience, however, typically for Internet-facing applications it would be in Internet DMZ network and for intranet, core network.
But again this will differ based on application/organization.
The mod_ssl module must be uncommented prior to SSL implementation.
LoadModule auth_basic_module modules/mod_ssl.so
mod_rewrite is responsible for the redirection and this must be uncommented in httpd.conf file.
LoadModule rewrite_module modules/mod_rewrite.so
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