Setup BBR for Linux

setup_bbr.sh

#!/bin/bash

err() {
    msg="$@"
    echo "ERROR: $msg" >&2
}

centos6() {
    rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
    rpm -Uvh http://www.elrepo.org/elrepo-release-6-8.el6.elrepo.noarch.rpm
    yum --enablerepo=elrepo-kernel install kernel-ml kernel-ml-devel -y
    sed -i 's:default=.*:default=0:g' /etc/grub.conf
}

centos7() {
    rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
    rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
    yum --enablerepo=elrepo-kernel install kernel-ml -y
    grub2-set-default 0
    reboot
}

ubuntu14() {
    wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.10.17/linux-image-4.10.17-041017-generic_4.10.17-041017.201705201051_amd64.deb
    dpkg -i linux-image-4.*.deb
    update-grub
}

check_kernel() {
    kv=$(uname -r)
    echo "Kernel is $kv"
    test "${kv:0:1}" == "4"
}

upgrade_kernel() {
    
    check_kernel && return 0
    
    if grep -qi ubuntu /etc/*release
    then
        ubuntu14
    elif grep -qi 'centos release 6' /etc/*release
    then
        centos6
    elif grep -qi 'centos linux release 7' /etc/*release
    then
        centos7
    else
        err Unsupported OS
        exit 1
    fi
    
    check_kernel
}

setup_bbr() {
    modprobe tcp_bbr
    echo "net.core.default_qdisc=fq" >> /etc/sysctl.conf
    echo "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf
    sysctl -p
}

#-----------------
# MAIN goes here
#-----------------

upgrade_kernel || exit 1
setup_bbr || exit 1

exit 0