On CentOS 7, how does one deploy Google BBR [handling, turning over] And centosbbr?

On CentOS 7, how does one deploy Google BBR [handling, turning over] And centosbbr?

How to deploy Google BBR on CentOS 7

This article carries from https://www.vultr.com/docs/how-to-deploy-google-bbr-on-centos-7

[Note: The kernel version used at the time of this article is 4.9.0 and is 4.15.6 at present (version 4.15 is higher than version 4.9 )]

 

 

Step 1: Use the Elrepo RPM repository to upgrade the kernel

To use BBR, You need to upgrade the kernel of CentOS 7 to 4.9.0 or above. You can use the Elrepo RPM repository to perform this operation easily.

Before upgrading, you can view the current kernel:

uname -r

This command should output a string, similar:

3.10.0-514.2. 2. El7 x86_64

As you can see, the current kernel is 3.10.0.

Install ELRepo repo:

sudo rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.orgsudo rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm

Use ELRepo repo to install the 4.9.0 kernel: [4.15.6 is currently installed]

sudo yum --enablerepo=elrepo-kernel install kernel-ml -y

Confirmation result:

rpm -qa | grep kernel

If the installation is successful, you should see the kernel-ml-4.9.0-1.el7.elrepo.x86_64 in the output list

kernel-ml-4.9.0-1.el7.elrepo.x86_64kernel-3.10.0-514.el7.x86_64kernel-tools-libs-3.10.0-514.2.2.el7.x86_64kernel-tools-3.10.0-514.2.2.el7.x86_64kernel-3.10.0-514.2.2.el7.x86_64

[Do not see OK]

Now, you need to enable the 4.9.0 kernel by setting the default GRUB2 boot item.

Show all entries in the Grub2 menu:

sudo egrep ^menuentry /etc/grub2.cfg | cut -f 2 -d \'

The result should be similar:

CentOS Linux 7 Rescue a0cbf86a6ef1416a8812657bb4f2b860 (4.9.0-1.el7.elrepo.x86_64)CentOS Linux (4.9.0-1.el7.elrepo.x86_64) 7 (Core)CentOS Linux (3.10.0-514.2.2.el7.x86_64) 7 (Core)CentOS Linux (3.10.0-514.el7.x86_64) 7 (Core)CentOS Linux (0-rescue-bf94f46c6bd04792a6a42c91bae645f7) 7 (Core)

Because the row count starts from 0 and the 4.9.0 kernel item is located on the second line, the default startup Item is set to 1:

sudo grub2-set-default 1

 

　Note: The result is different from the example.

CentOS Linux (4.15.6-1. el7.elrepo. x86_64) 7 (Core)

　　CentOS Linux 7 Rescue 186e68c8657e4bfc8df5044d08b50231 (3.10.0-693.17.1.el7.x86 _ 64)

CentOS Linux (3.10.0-693.17.1.el7.x86 _ 64) 7 (Core)
CentOS Linux (3.10.0-693.11.6.el7.x86 _ 64) 7 (Core)
CentOS Linux (3.10.0-693. el7.x86 _ 64) 7 (Core)
CentOS Linux (0-rescue-c73a5ccf3b8145c3a675b64c4c3ab1d4) 7 (Core)

　　At this timeCentOS Linux (4.15.6-1. el7.elrepo. x86_64) 7 (Core)Located in the first entry, so what I entered should be

　　

　　sudo grub2-set-default 0

 

Restart the system:

sudo shutdown -r now

When the server is online again, log on again and run the uname command again to confirm that you are using the correct kernel:

uname -r

You should see the following results:

4.9.0-1.el7.elrepo.x86_64

(Now it should be)

4.15.6-1.el7.elrepo.x86_64

 

 

 

Step 2: Enable BBR

To enable the BBR algorithm, you must modify the Sysctl configuration as follows:

echo 'net.core.default_qdisc=fq' | sudo tee -a /etc/sysctl.confecho 'net.ipv4.tcp_congestion_control=bbr' | sudo tee -a /etc/sysctl.confsudo sysctl -p

Now, you can use the following command to confirm that BBR is Enabled:

sudo sysctl net.ipv4.tcp_available_congestion_control

The output should be similar:

net.ipv4.tcp_available_congestion_control = bbr cubic reno

Next, verify:

sudo sysctl -n net.ipv4.tcp_congestion_control

The output should be:

bbr

Finally, check whether the kernel module is loaded:

lsmod | grep bbr

The output will be similar:

tcp_bbr 16384 0

 

 

Step 3 (optional): test network performance enhancement

To test the BBR network performance enhancement, you can create a file in the Web Server Directory for download, and then test the download speed from the Web browser on the desktop computer.

sudo yum install httpd -ysudo systemctl start httpd.servicesudo firewall-cmd --zone=public --permanent --add-service=httpsudo firewall-cmd --reloadcd /var/www/htmlsudo dd if=/dev/zero of=500mb.zip bs=1024k count=500

Finally, access the URL http: // [your-server-IP]/500mb.zip from the Web browser on the desktop computer, and evaluate the download speed.

Above. Thank you for reading.