CentOS7更新linux内核
1、查看当前内核版本
uname -r
2、安装epel源
yum install -y epel-release
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 update
3、安装内核
yum --enablerepo=elrepo-kernel list all |grep kernel
yum --enablerepo=elrepo-kernel install kernel-ml kernel-ml-tools kernel-ml-header
查看系统内核
[root@CentOS ~]# egrep ^menuentry /etc/grub2.cfg | cut -f 2 -d '
CentOS Linux (5.4.7-1.el7.elrepo.x86_64) 7 (Core)
CentOS Linux (3.10.0-1062.9.1.el7.x86_64) 7 (Core)
CentOS Linux (3.10.0-693.21.1.el7.x86_64) 7 (Core)
CentOS Linux (3.10.0-693.el7.x86_64) 7 (Core)
CentOS Linux (0-rescue-8f930081116c4c29bda2a2f6aff35c68) 7 (Core)
[root@CentOS ~]# rpm -qa | grep kernel
kernel-3.10.0-693.21.1.el7.x86_64
kernel-ml-tools-5.4.7-1.el7.elrepo.x86_64
kernel-3.10.0-1062.9.1.el7.x86_64
kernel-ml-5.4.7-1.el7.elrepo.x86_64
kernel-3.10.0-693.el7.x86_64
abrt-addon-kerneloops-2.1.11-55.el7.centos.x86_64
kernel-ml-devel-5.4.7-1.el7.elrepo.x86_64
kernel-ml-tools-libs-5.4.7-1.el7.elrepo.x86_64
选择最新的内核启动系统
# default 0表示第一个内核设置为默认运行, 选择最新内核就对了
[root@CentOS ~]# grub2-set-default 0
4、重启系统
reboot
查看内核
[root@CentOS ~]# uname -r
5.4.7-1.el7.elrepo.x86_64
卸载旧的内核
yum remove kernel
如果有运行虚拟化软件,需要同时安装`kenel-ml-headers
开启bbr加速
[root@CentOS ~]# echo "net.core.default_qdisc=fq" >> /etc/sysctl.conf
[root@CentOS ~]# echo "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf
[root@CentOS ~]# sysctl -p
net.core.default_qdisc = fq
net.ipv4.tcp_congestion_control = bbr
检查bbr模块
[root@CentOS ~]# lsmod |grep bbr
tcp_bbr 20480 1
[root@CentOS ~]# sysctl net.ipv4.tcp_available_congestion_control
net.ipv4.tcp_available_congestion_control = reno cubic bbr
[root@CentOS ~]# sysctl net.ipv4.tcp_congestion_control
net.ipv4.tcp_congestion_control = bbr
参考链接
elrepo.org/tiki/tiki-i… unixetc.com/post/linux_… elrepo.org/linux/kerne… teddysun.com/623.html