How to deploy Google BBR on CentOS 7

How to deploy Google BBR on CentOS 7

This article describes 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.org
Sudo 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_64
Kernel-3.10.0-514.el7.x86_64
Kernel-tools-libs-3.10.0-514.2.2.el7.x86_64
Kernel-tools-3.10.0-514.2.2.el7.x86_64
Kernel-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)

In this case, CentOS Linux (4.15.6-1. el7.elrepo. x86_64) 7 (Core) is 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. conf
Echo 'Net. ipv4.tcp _ congestion_control = bbr' | sudo tee-a/etc/sysctl. conf
Sudo 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-y
Sudo systemctl start httpd. service
Sudo firewall-cmd -- zone = public -- permanent -- add-service = http
Sudo firewall-cmd -- reload
Cd/var/www/html
Sudo dd if =/dev/zero of1_500mb.zip bs = 1024 k 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.

OK. Thank you for reading.

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