I recently read that TCP BBR has significantly increased throughput and reduced latency for connections on Google’s internal backbone networks and google.com and YouTube Web servers throughput by 4 percent on average globally – and by more than 14 percent in some countries. The TCP BBR patch needs to be applied to the Linux kernel. The first public release of BBR was here, in September 2016. The patch is available to any one to download and install. Another option is using Google Cloud Platform (GCP). GCP by default turned on to use a cutting-edge new congestion control algorithm named TCP BBR.
I recently setup a small server which is running Debian 9. The purpose of this machine is to run OpenVPN server on port 443 to bypass censorship. It runs the following services and nothing else:
- Squid on private IP belongs to VPN pool (10.8.0.1:3128)
- SSH on private IP belongs to VPN pool (10.8.0.1:22)
- DNS resolver on private IP belongs to VPN pool (10.8.0.1:53)
- OpneVPN on public IP port 443 (server_public_ip_address:443)
Debian GNU/Linux version 9.0 stretch has been released ( jump to download ) after many months of constant development and available for download in various media format. Debian 9.0 is a free operating system includes various new features such as support for mips64el architecture, GNOME 3.22, KDE Plasma 5.8, LXDE, LXQt 0.11, MATE 1.16, Xfce 4.12, Linux kernel 4.9 and more. Debian 9 is dedicated to the project’s founder Ian Murdock, who passed away on 28 December 2015.
From my mailbag:
I run a Debian Linux 8.x on my Desktop and Ubuntu Linux 16.04 LTS on my Linode cloud server for my personal website. I am concerned that my Linux is affected by the recent Wannacrypt malware. I am reading about a ransomware attack, what do I need to do? Should I be worried?
–Concerned Linux User
In the world of mail servers, there are many software and technologies. Here is a list of 3 of them that you must know.
GnuBee is a personal NAS (Network Attached Storage) cloud server that is currently being funded on Crowd Supply. It is a low-cost, low-power, NAS device that runs GNU/Linux and it is claimed to be based on free, libre, and open source software. No proprietary drivers needed to use GnuBee.
Little Snitch is a traditional software firewall for macOS. You can use it to monitor applications, preventing or permitting them to connect to attached networks through advanced rules. OpenSnitch is a GNU/Linux port of the Little Snitch application firewall written in Python.
Everyone loves the desktop operating system. People customize their Linux or Unix desktop with themes, wallpapers, killer configuration and more. These customizations show you how cool your desktop can be!
Recently I come across a nice little nifty tool called pssh to run a single command on multiple Linux / UNIX / BSD servers. You can easily increase your productivy with this SSH tool.
More about pssh
pssh is a command line tool for executing ssh in parallel on some hosts. It provides specialties includes:
- Sending input to all of the processes
- Inputting a password to ssh
- Saving output to files
- IT/sysadmin taks automation such as patching servers
- Timing out and more
Let us see how to install and use pssh on Linux and Unix-like system.
Oops! I did it again. I thought I was logged into my home server. Turns out I rebooted the db server. Another my not so favorite is typing “shutdown -h 0” into the wrong terminal. I know a few people who have admitted to doing that here.
Is there any end to the madness? Do I need to suffer from accidentally random reboots and shutdowns? After all, it is human nature to make mistakes, but one should not keep on making the same mistakes again and again.