Now that I'm monitoring my logs using cetralised RSyslog, I regularly notice SSH attacks right when and as they happen. When it becomes obvious that someone's trying to brute-force SSH, I don't always wait to let fail2ban fix the issue - sometimes I … [Continue reading] about Ban Specific IP Manually with fail2ban
Unix Tutorial Digest – March 9th, 2020
Here's the monthly summary of Unix/Linux news and Unix Tutorial posts. Please get in touch to arrange a technical consultation with me or suggest a useful link for the next digest here at Unix Tutorial. Unix Tutorial … [Continue reading] about Unix Tutorial Digest – March 9th, 2020
git push Asks for Username and Password
I've been refreshing my gleb.reys.net website recently and experienced a weird error: pushing latest changes to GitHub resulted in my username and password prompted. Figured I should write down what the issue was and how easy it was to fix it. git … [Continue reading] about git push Asks for Username and Password
Force Filesystem Repair in Raspbian
Raspberry Pi systems use microSD cards and therefore are more error prone than typical servers with hard disks or SSD. Such corruptions are especially tricky when the only storage available to Raspberry Pi is the microSD card which booted Raspbian … [Continue reading] about Force Filesystem Repair in Raspbian
Why I Bought Sublime Text 3
It's taken me exactly two weeks to recognise the value of a native editor like Sublime Text 3 used for Ansible automation and Python scripting. I'm so impressed with the benefits brought by this approach that after another gentle reminder to perhpaps … [Continue reading] about Why I Bought Sublime Text 3
Log fail2ban Messages to Syslog
With quite a few servers accepting SSH connections and protecting themselves using fail2ban, you very quickly recognize one thing: it makes a lot of sense to centralize fail2ban reporting using syslog. To update fail2ban logging. you need to edit … [Continue reading] about Log fail2ban Messages to Syslog
Colorized ls with grc
I blogged about Generic Colouriser (grc) last week, cause I'm using it now to monitor syslog messages in my centralised RSyslog setup. I also mentioned that grc suppors many standard commands in addition to parsing common types of log … [Continue reading] about Colorized ls with grc
Removed DHCP Daemons in Raspbian
I got one of my Raspberry Pi servers attempting to obtain DHCP IP address, a behavior that ignored my static IP address configuration. Not sure why, but it appeared I'd be getting an extra DHCP address, from the same network segment, in addition … [Continue reading] about Removed DHCP Daemons in Raspbian
How To: Disable Sleep on Ubuntu Server
You may remember that I have a small automation server in my home office that's running Ubiquiti UniFi Controller software and where I upgraded UniFi Controller on Ubuntu 19.04. I noticed that this server hasn't been terribly available since … [Continue reading] about How To: Disable Sleep on Ubuntu Server
VPS1 Server is Online
I have just started deploying my new VPS server online: vps1.unixtutorial.org The idea is that I'll be hosting a number of VPS servers for us you learn Linux basics. vps1 is Ubuntu, future VPS servers will probably be CentOS and Amazon Linux 2 … [Continue reading] about VPS1 Server is Online