BBR (Bottleneck Bandwidth and RTT) is a new congestion control algorithm which is contributed to the Linux kernel TCP stack by Google. With BBR in place, a Linux server can get significantly increased throughput and reduced latency for connections. Besides, it’s easy to deploy BBR because this algorithm requires only updates on the sender side, not in the network or on the receiver side.
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| #!/usr/bin/env bash | |
| if [ "$(whoami)" != "root" ]; then | |
| SUDO=sudo | |
| fi | |
| if ! $(type lsb_release > /dev/null 2>&1) ; then | |
| ${SUDO} yum install -y redhat-lsb-core | |
| fi | |
| majversion=$(lsb_release -rs | cut -f1 -d.) | |
| # Import the ELRepo GPG Key | |
| ${SUDO} rpm –import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org | |
| ${SUDO} yum insall -y yum-plugin-fastestmirror | |
| # Install latest kernel using the ELRepo repository: | |
| if [ ${majversion} == 6 ]; then | |
| # CentOS 6 | |
| ${SUDO} yum install -y https://www.elrepo.org/elrepo-release-6-9.el6.elrepo.noarch.rpm | |
| ${SUDO} yum –enablerepo=elrepo-kernel install -y kernel-lt kernel-lt-devel | |
| elif [ ${majversion} == 7 ]; then | |
| # CentOS 7 | |
| ${SUDO} yum install -y https://www.elrepo.org/elrepo-release-7.0-4.el7.elrepo.noarch.rpm | |
| ${SUDO} yum –enablerepo=elrepo-kernel install -y kernel-ml kernel-ml-devel | |
| elif [ ${majversion} == 8 ]; then | |
| # CentOS 8 | |
| ${SUDO} yum install -y https://www.elrepo.org/elrepo-release-8.0-2.el8.elrepo.noarch.rpm | |
| ${SUDO} yum –enablerepo=elrepo-kernel install -y kernel-ml kernel-ml-devel | |
| else | |
| echo "Not support version" | |
| exit 1 | |
| fi | |
| # Check all entries in the grub2 menu | |
| if [ ${majversion} == 6 ]; then | |
| ${SUDO} egrep ^menuentry /etc/grub.conf | cut -f 2 -d \' | |
| # Set the default boot entry | |
| ${SUDO} sed -i "s/default=[0-9]/default=0/g" /etc/grub.conf | |
| else | |
| ${SUDO} egrep ^menuentry /etc/grub2.cfg | cut -f 2 -d \' | |
| # Set the default boot entry | |
| ${SUDO} grub2-set-default 0 | |
| fi | |
| # Set BBR TCP congestion control | |
| # Or use zercle's sysctl script | |
| # https://gist.github.com/bouroo/bc52ad58a6e75d44e5235b229e9ca988 | |
| echo '# Fallback if BBR not support' | ${SUDO} tee -a /etc/sysctl.conf | |
| echo 'net.ipv4.tcp_congestion_control=cubic' | ${SUDO} tee -a /etc/sysctl.conf | |
| echo 'net.ipv4.tcp_congestion_control=bbr' | ${SUDO} tee -a /etc/sysctl.conf | |
| echo 'net.core.default_qdisc=fq' | ${SUDO} tee -a /etc/sysctl.conf | |
| echo 'net.ipv4.tcp_notsent_lowat = 16384' | ${SUDO} tee -a /etc/sysctl.conf | |
| ${SUDO} sysctl -p | |
| # After reboot check kernel and remove normal kernel | |
| # uname -a | |
| # if using kernel-ml | |
| # yum remove kernel | |
| exit 0 |
System administrator at Zercle Technology Co., Ltd.
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