Why are there so many Apache processes?
3 Answers. Apache is running multiple processes to have them ready when a client request comes in. Spawning a server process is slow, so it’s best to have one waiting for a client. For memory usage, you should take into the account RES size (as displayed by top), which is the amount of physical memory used by the task.
What is httpd processes in Linux?
httpd is the Apache HyperText Transfer Protocol (HTTP) server program. It is designed to be run as a standalone daemon process. When used like this it will create a pool of child processes or threads to handle requests.
How many requests can Apache handle?
By default, Apache Request limit is 160 requests per second, that is, Apache can handle up to 160 requests per second, without any modification.
What is the purpose of initiating multiple apache2 processes?
Apache httpd always tries to maintain several spare or idle server processes, which stand ready to serve incoming requests. In this way, clients do not need to wait for a new child processes to be forked before their requests can be served.
What is Mod_evasive?
Mod_evasive is an Apache module that can be used to protect against various kinds of attacks on the Apache web server including DDoS, DoS and brute force. Mod_evasive provide evasive action in the event of attacks and reports malicious activity via email and syslog.
What is usr sbin apache2?
/etc – directory is for storing the configuration files. /usr – /usr/bin – user’s executable binary files – /usr/sbin – user’s executable binary files that can only be run with root privileges. Hence /usr/sbin/apache2 is the apache2 command’s full path, as in where apache2 command lives and its binary.
What is the httpd process?
What is D in httpd?
HTTP Daemon is a software program that runs in the background of a web server and waits for the incoming server requests. The daemon answers the request automatically and serves the hypertext and multimedia documents over the Internet using HTTP. HTTPd stands for Hypertext Transfer Protocol daemon (i.e. Web server).
What is Max request workers Apache?
Apache Worker MPM Parameters MaxRequestWorkers sets the limit on the number of simultaneously requests that will be served, i.e. restricts the total number of threads that will be available to serve clients. MaxSpareThreads deals with idle threads on a server-wide basis.
How does Apache handle multiple requests?
Requests are handled in parallel by the web server (which runs the PHP script). Updating data in the database is pretty fast, so any update will appear instantaneous, even if you need to update multiple tables.
What is Mod_evasive Apache?
Does Fail2ban protect DDoS?
Protect Web Servers from DDoS Attacks using Fail2ban.
Why are there so many httpd processes in Apache?
In my experience, the dozens of httpd processes were DOS attacks. After installing mod_evasive, the dozens of httpd processes showing via top were all but eliminated and my mysql CPU load went from an average 100%+ / 99% of the time utilization down to an expected 20% load during heavier query operations.
What is example of multiple httpd processes running on Linux?
The following example shows multiple httpd processes (with MPM worker and event) running on an Linux (Xen) system:
How many requests does Apache get per second?
S 16:31 0:00 /usr/sbin/httpd -DFOREGROUND root 24496 0.0 0.0 112652 964 pts/0 S+ 16:31 0:00 grep –color=auto httpd My apache servers get a request at 2 per second.
How to get rid of a lot of httpd processes?
After installing mod_evasive, the dozens of httpd processes showing via top were all but eliminated and my mysql CPU load went from an average 100%+ / 99% of the time utilization down to an expected 20% load during heavier query operations. and viola. Even if a DOS attack isn’t your issue, mitigating attacks before they happen is wise.
