racknerd cheap US VPS server installation Google BBR tutorial

How about racknerd? Is racknerd good? RackNerd is an American brand founded in 2019. It mainly provides sales of VPS, independent servers, cluster servers, large hard drive servers and other products in American data centers. It is an American merchant that focuses on high cost performance! Supports Alipay, WeChat, paypal and other payment methods. Racknerd's VPS is very cheap, some cost a few dollars a year. We can maximize the use of such a machine, so we can still give it a try.

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VPS features: KVM virtual architecture, using AMD Ryzen + NVMe high-speed read and write hard drives, with computer rooms available in New York, Chicago and the newly launched Seattle.

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2 cores	3G	45GB	6TB	1Gbps	1	$51.33/year	Link

BBR installation process:

1. First, you need to upgrade to 4.9 or the latest Linux kernel, use the terminal to log in to the VPS server, and then enter the following commands:

rpm –import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm yum –enablerepo=elrepo-kernel install kernel-ml -y

2. After the Linux kernel is successfully installed, it is not the latest by default, so it needs to be modified manually.

Execute the following command to see which kernels have been installed:

cat /boot/grub2/grub.cfg |grep menuentry

You can choose any installation. Here, install 5.4.2-1.el7.elrepo.x86_64 and execute the command:

grub2-set-default ‘CentOS Linux 7 Rescue f162c5663d6044ba8d784979acd61b44 (5.4.2-1.el7.elrepo.x86_64)’

Note: CentOS Linux 7 Rescue f162c5663d6044ba8d784979acd61b44 (5.4.2-1.el7.elrepo.x86_64)’ can be replaced with the version you want to replace.

3. After the installation is complete, enter the "reboot" command to restart the VPS.

4. Next, execute the uname command to confirm whether the correct kernel is used. The command is as follows:

uname -r

If the result "5.4.2-1.el7.elrepo.x86_64" appears, the upgrade is successful.

​5. After the kernel is completed, install BBR and execute the following three commands in sequence:

echo ‘net.core.default_qdisc=fq’ | sudo tee -a /etc/sysctl.conf echo ‘net.ipv4.tcp_congestion_control=bbr’ | sudo tee -a /etc/sysctl.conf sudo sysctl -p

6. After installing BBR, execute the following commands to check whether BBR is opened successfully:

sudo sysctl net.ipv4.tcp_available_congestion_control #The output should be net.ipv4.tcp_available_congestion_control = reno cubic bbr sudo sysctl -n net.ipv4.tcp_congestion_control # The output should be bbr lsmod | grep bbr # The output should be similar to tcp_bbr 20480 1

7. Finally enter the following command. If the output contains bbr, it means the installation is successful.

sysctl net.ipv4.tcp_available_congestion_control

System kernel version upgrade method

It should be noted that if the system kernel is below version 4.9, BBR cannot be installed, so the kernel needs to be upgraded. The specific method is as follows:

1. First log in to the VPS using the root user, and then execute the following command:

wget –no-check-certificate https://github.com/teddysun/across/raw/master/bbr.sh && chmod +x bbr.sh && ./bbr.sh

The current VPS operating system (OS) and kernel (Kernel) system will be displayed at this time. For example, the editor’s kernel version is version 3.10.0, as shown in the figure below:

2. Press the Enter key and wait for a few minutes. After the installation is successful, you will see the new kernel. As shown in the figure below, the kernel has changed from 3.10.0 before installation to the highest version 5.6.14, so BBR acceleration can be installed.

3. Enter "y" and press Enter to restart the VPS. BBR will take effect only after the restart.

4. After restarting, log in to the remote VPS using the terminal again, and finally enter the following command:

uname -r

If you see: 5.6.14-1.e17.elrepo.x86_64, it means the kernel upgrade is successful.

BBR acceleration effect test

After the BBR acceleration function is successfully installed, if you want to see the effect, execute the following command:

sudo dd if=/dev/zero of=500mb.zip bs=1024k count=500

After BBR acceleration, access to YouTube 1080HD is basically smooth, and the overall speed is still acceptable:

As we all know, BBR is a new congestion control algorithm proposed by Google, which can significantly improve the throughput of Linux system servers and reduce the delay of TCP connections, and can significantly improve foreign VPS access and download speeds.

Finally, if you think the above installation process is complicated, you can consider choosing the Banwagonhost Cloud Server VPS. The system template comes with BBR acceleration, which is very convenient.

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