I’ve done a couple of application slowness (brownout) troubleshooting sessions recently. This blog is my attempt to condense some observations from both engagements, to share lessons learned. “Condense” might not be the right word, seeing how long this blog got! Troubleshooting with some process awareness can help! I have a troubleshooting process. Sometimes I do all the aspects, sometimes I do the short version. I think it helps! As I was drafting this blog, ipspace.net posted a very comprehensive blog on the same topic. Recommended! Darn, Ivan beat me to print again!
Firewalls are becoming increasingly important in today’s world. Hackers and automated scripts are constantly trying to invade your system and use it for Bitcoin mining, botnets or other things. To prevent these attacks, you can use a firewall on your system. IPTables is the strongest firewall in Linux because it can filter packets in the kernel before they reach the application. Using IPTables is not very easy for Linux beginners. We have created easywall - the simple IPTables web interface . The focus of the software is on easy installation and use. Access this neat software over on github: easywall