One-Click Kernel Upgrade and BBR Activation on CentOS

Google BBR is a TCP acceleration tool similar to RRS. Google open-sourced the BBR congestion control algorithm and submitted it to the Linux kernel. The latest 4.9 kernel version already includes this algorithm. Therefore, to use BBR, you must upgrade to the latest kernel.

Check Architecture

OpenVZ virtualization does not support individual kernel upgrades, so it can be skipped. KVM, XEN, and other virtualizations generally support this. You can use the following command on CentOS to check the current virtualization technology. For detailed instructions, refer to: CentOS Cloud Host/VPS Architecture Check.

# Install virt-what
yum install virt-what
# Check architecture
virt-what

Upgrade Kernel and Enable BBR

Execute the following commands in order to upgrade the kernel and enable BBR. After execution, you must restart the server. If the kernel upgrade fails and the system cannot start, refer to CentOS 6 Modify Boot Kernel for handling. Please back up important data before upgrading and do not test in a production environment.

# Execute the following commands separately to upgrade the kernel
wget --no-check-certificate https://github.com/teddysun/across/raw/master/bbr.sh
chmod +x bbr.sh
./bbr.sh

Verification

# Check kernel version, generally the return value should be >= 4.9
uname -r
# Execute the following command, generally returns net.ipv4.tcp_available_congestion_control = bbr cubic reno
sysctl net.ipv4.tcp_available_congestion_control
# The following command generally returns net.ipv4.tcp_congestion_control = bbr
sysctl net.ipv4.tcp_congestion_control
# The following command generally returns net.core.default_qdisc = fq
sysctl net.core.default_qdisc
# If the return value includes the tcp_bbr module, BBR is enabled
lsmod | grep bbr

Other Notes

The one-click script has been tested on Vultr. This script is also applicable to Debian 7+ and Ubuntu 12+. Please try it yourself. It works even better when combined with another script by Qiushui Yibing: CentOS One-Click Shadowsocks Installation Script.

This article references: One-Click Install Latest Kernel and Enable BBR Script by teddysun