CentOS7部分备忘

关闭防火墙

systemctl disable firewalld
systemctl stop firewalld
systemctl status firewalld

yum

cd /etc/yum.repos.d/
mv CentOS-Base.repo CentOS-Base.repo.bak
wget -O CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo ##替换yum源
---
yum makecache fast ## 缓存
yum -y update ## 升级
yum -y upgrade ## 只升级所有包，不升级内核

关闭swap分区

swapoff -a
echo "vm.swappiness=0" >> /etc/sysctl.conf
sysctl -p /etc/sysctl.conf
sed -i 's$/dev/mapper/centos-swap$#/dev/mapper/centos-swap$g' /etc/fstab
free -m

关闭selinux

vim /etc/selinux/config

image.png

setenforce 0

重启

NetworkManager

service  NetworkManager stop
systemctl disable NetworkManager

升级系统内核

一般来说，只有从 kernel.org 下载并编译安装的内核才是官方内核。
大多数 Linux 发行版提供自行维护的内核，可以通过 yum 或 rpm 等包管理系统升级。
1）导入ELRepo软件仓库的公共秘钥

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org

2）安装ELRepo软件仓库的yum源

rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm

3）安装主线内核（ml=mainline）4.14.11

yum --enablerepo=elrepo-kernel install kernel-ml
```y
4）查看系统可用内核，并设置启动项

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

#### k8s  yum源

wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo