Centos7安装BBR

安装elrepo并升级内核

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm
yum --enablerepo=elrepo-kernel install kernel-ml -y

安装完成后使用下面命令查看当前已安装的内核

awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg

返回

0 : CentOS Linux (5.13.2-1.el7.elrepo.x86_64) 7 (Core)
1 : CentOS Linux (3.10.0-1160.25.1.el7.x86_64) 7 (Core)
2 : CentOS Linux (0-rescue-1cfc3bd119f34aa79df425015ceaaeee) 7 (Core)

把CentOS Linux (5.13.2-1.el7.elrepo.x86_64) 7 (Core)内核设置为默认

grub2-set-default 0

重启

reboot

查询内核版本

uname -r

输出

5.13.2-1.el7.elrepo.x86_64

即可

4、设置BBR

编辑

vi /etc/sysctl.conf

添加如下内容

net.core.default_qdisc = fq
net.ipv4.tcp_congestion_control = bbr

加载系统参数

sysctl -p

验证bbr是否已经开启

lsmod | grep bbr

返回形如如下形式的信息即成功

tcp_bbr                20480  2

Centos7.1升级7.9

配置CentOS-Base.repo

vi /etc/yum.repos.d/CentOS-Base.repo

把CentOS-Base.repo内容替换如下

# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client.  You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#
[base]
name=CentOS-$releasever - Base
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
baseurl=http://mirrors.163.com/centos/7.9.2009/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#released updates
[updates]
name=CentOS-$releasever - Updates
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
baseurl=http://mirrors.163.com/centos/7.9.2009/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=
file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-

配置好之后保存退出

:wq

随后执行

yum clean all
yum update --disablerepo=epel 

等待升级完成,之后会自动重启。查看系统版本

 cat /etc/redhat-release

输出为7.9 表示升级成功

CentOS Linux release 7.9.2009 (Core)