UDP Load Balancing using PEN Rumi, January 5, 2017 First setup PEN load balancer using this document. After that, keep digging below 🙂 And that’s it, so now if we run pen we see it now has UDP support. root@penudp:~/pen-0.18.0# pen usage: pen [-C addr:port] [-X] [-b sec] [-S N] [-c N] [-e host[:port]] [-t sec] [-x N] [-w dir] [-HPWadfhrs] [-o option] [-E certfile] [-K keyfile] [-G cacertfile] [-A cacertdir] [-Z] [-R] [-L protocol] [host:]port h1[:p1[:maxc1[:hard1[:weight1[:prio1]]]]] [h2[:p2[:maxc2[:hard2[:weight2[:prio2]]]]]] ... -B host:port abuse server for naughty clients -C port control port -T sec tracking time in seconds (0 = forever) [0] -H add X-Forwarded-For header in http requests -U use udp protocol support Now to test this I have just brought up a couple of DNS servers running bind. These have the address 192.168.74.221 and 192.168.74.222. So we start pen by running: root@penudp:/# pen -r -U 53 192.168.74.221:53 192.168.74.222 This will start pen listening on port 53 and balance the servers 192.168.74.221 and 192.168.74.222 in round robin mode. We can then check its running with: root@penudp:/# netstat -tnulp | grep pen udp 0 0 0.0.0.0:53 0.0.0.0:* 29661/pen To test it is working I have enabled logging on the DNS servers and will use dig and specify the pen server as the name server. root@penudp:/# dig @127.0.0.1 bbc.com root@penudp:/# dig @127.0.0.1 microsoft.com Then looking at the bind logs we can see that the connections are being correctly made to each server. ben@bindd1:~$ tail -n 1 /var/log/syslog Aug 22 12:42:57 bindd1 named[1372]: client 192.168.65.219#44048: query: bbc.com IN A +E (192.168.74.221) root@bind2:/home/ben# tail -n 1 /var/log/syslog Aug 22 12:43:07 bind2 named[6827]: client 192.168.65.219#57100: query: microsoft.com IN A +E (192.168.74.222) Related Administrations Configurations (Linux) LoadBalancerPen
SOLVED Debian Wheezy Letsencrypt error /opt/eff.org/certbot/venv/bin/python: No module named pip.__main__; ‘pip’ is a package and cannot be directly executed May 10, 2019 My case and solution: Debian 7.11 wheezy python2.7 python-pip NOT installed My steps: #ln -fs /usr/lib/python2.7/plat-x86_64-linux-gnu/_sysconfigdata_nd.py /usr/lib/python2.7/ #wget https://raw.githubusercontent.com/certbot/certbot/75499277be6699fd5a9b884837546391950a3ec9/certbot-auto #chmod +x ./certbot-auto #certbot-auto renew –no-self-upgrade it download some files and works fine. Src: https://github.com/certbot/certbot/issues/6824 Related Read More
Allow ICMP Rule on Windows 7, Windows Vista, Windows Server 2008, or Windows Server 2008 R2 August 25, 2010 To allow inbound Internet Control Message Protocol (ICMP) network traffic, use the Windows Firewall with Advanced Security node in the Group Policy Management MMC snap-in to create firewall rules. This type of rule allows ICMP requests and responses to be sent and received by computers on the network. Related Read More
Install Development Tool on CentOS and Debian June 17, 2022 Well, in my working domain I face these tools to be installed, so that most of the dependent tools or programs that need to be deployed later don’t face much of dependency issue. So here goes the installation process for both the OS. On CentOS/RHEL system use the follwoing command… Read More