CentOS 7.5基础优化
1)隐藏系统版本信息>/etc/issue
> /etc/issue.net
2)更改yum源为国内的yum源
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
3)设置字符为英文字符
echo "LANG=en_US.UTF-8" >/etc/locale.conf
echo "export LC_ALL=C" >>/etc/bashrc
source /etc/bashrc
4)关闭selinux
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/selinux/config
setenforce 0
5)关闭iptables
systemctl stop firewalld
systemctl disable firewalld.service
6)设置命令行历史记录保存个数
echo "export HISTSIZE=10">>/etc/bashrc
source /etc/bashrc
7)设置命令行历史记录文件中保存的个数
echo "export HISTFILESIZE=10" >>/etc/bashrc
source /etc/bashrc
8)命令行历史记录中不保存以空格开头的记录
echo "export HISTCONTROL=ignorespace" >>/etc/bashrc
source /etc/bashrc
9)为rm命令设置别名
echo "alias rm='Do not use rm command'" >>/etc/bashrc
source /etc/bashrc
10)加大文件描述符
cat >>/etc/security/limits.conf
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