centos 内核升级

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-lt -y

grub2-mkconfig

grub2-set-default 0

 

 

 

#修改内核参数

echo "fs.file-max = 1000000">> /etc/sysctl.conf
echo "net.core.somaxconn = 32768">> /etc/sysctl.conf
echo "net.ipv4.tcp_tw_recycle = 0">> /etc/sysctl.conf
echo "net.ipv4.tcp_syncookies = 0">> /etc/sysctl.conf
echo "vm.overcommit_memory = 1">> /etc/sysctl.conf

sysctl -p

 

cat << EOF >>/etc/security/limits.conf
* soft nofile 1000000
* hard nofile 1000000
* soft stack 32768
* hard stack 32768
* soft nproc 80000
* hard nproc 80000
EOF

 

 

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

mv /etc/yum.repos.d/epel.repo /etc/yum.repos.d/epel.repo.bak

wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
yum clean all
yum makecache