-c – the number of concurrent users, default is 10.-g – GET, pull down HTTP headers and display the transaction.-C – specify your own configuration file.You can also use command line options, if you want to try different settings from the ones described in the configuration file. Now to tell siege to test the URLs from the file, use the -f option like this: # siege -f /usr/local/etc/urls.txt You can describe the URLs in /usr/local/etc/urls.txt like this: Multiple Web server Load Testing You can test multiple URLs, by setting siege to read them from file. You should also keep an eye on the response time. If the availability remains at 100% and there are no failed connections, your system did well and there were no issues. Running siege is quite easy, you only need to specify the website you wish to test like this: # siege Testing Website Load with Siege Benchmarking Utility With the current configuration, siege will imitate 25 concurrent users over 1 minute. Sample Output logfile = $(HOME)/var/log/siege.log Note that I have uncomment the logfile and time directives: # cat siegerc |egrep -v "^$|#" The contents of the file should look something like this. This will generate nf file located in your user’s home ~/.siege/nf. In case you have decided to build the package from source, you will have to run: $ sudo nfig Once you have completed the installation, you can adjust your siege configuration file. configure -prefix=/usr/local -with-ssl=/usr/bin/opensslĬonfiguring Siege HTTP Load Testing Utility in Linux Then you can download Siege using wget command and install from sources as shown. # yum groupinstall 'Development Tools' #CentOS/RHEL $ sudo apt install build-essential #Ubuntu/Debian For that purpose you will need to have build-essential and development packages installed. Of course for a large scale DDOS this isn't going to solve the problem of the attackers stuffing your internet pipe with packets your server ignores - for that you need to speak to your upstream provider.For CentOS/RHEL, you need to install and enable repository to install siege with: # yum install epel-releaseĪlternatively, you can build the Siege from source. While you could handle the request on the webserver, a better solution is to block access from the remote IP address using iptables - fail2ban is the tool for bridging your log data to your iptables config. Then, for the connections which get through, there may be characteristics in the HTTP request which would identify an attack (referrer, URL requested, user-agent, accept-language.) it doesn't matter what specific values you pick for these just now - you just need to esure that you've got the machinery in place where you can quickly change the parameters at the first sign of an attack. It's also a good idea to limit bandwidth, depending on your traffic profile to, say10% of the available bandwidth - this is done using tc rather than iptables. connlimit-above 20 -j REJECT -reject-with tcp-reset You can limit the number of concurrent connections per ip address: iptables -A INPUT -p tcp -syn -dport 80 -m connlimit \ (drops new connection requests when the rate rises above 80 each 30 seconds) Iptables -A INPUT -p tcp -dport 80 -i eth0 -m state -state NEW -m recent \ You need to think about how you clssify attacks and differentiate them from real traffic - the speed at which new conections are being created is a very good indicator - and you can configure iptables to limit new connections on a per ip basis: iptables -A INPUT -p tcp -dport 80 -i eth0 -m state -state NEW -m recent -set Still it's a good idea to prevent DOS attacks as far awayas possible from your application. That you are already running nginx is a good start - event based servers are much more resilient against sloloris type attacks.
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