CentOS 7 初始化

更新软件包

yum update -y

安装基础工具

yum install bash-completion net-tools chrony lrzsz -y

• bash-completion
• net-tools
• chrony
• lrzsz

更新网卡名称，禁用IPV6

在/etc/default/grub中 GRUB_CMDLINE_LINUX 值中添加 ipv6.disable=1 net.ifnames=0 biosdevname=0

• BIOS

grub2-mkconfig  -o  /boot/grub2/grub.cfg

• EFI

grub2-mkconfig  -o  /boot/efi/EFI/centos/grub2/grub.cfg

卸载多余软件包

yum remove NetworkManager* -y
yum remove postfix -y
yum remove aic94xx-firmware-30-6.el7.noarch -y
yum remove iwl2000-firmware-18.168.6.1-80.el7_9.noarch -y
yum remove iwl6050-firmware-41.28.5.1-80.el7_9.noarch -y
yum remove iwl3945-firmware-15.32.2.9-80.el7_9.noarch -y
yum remove iwl105-firmware-18.168.6.1-80.el7_9.noarch -y
yum remove iwl4965-firmware-228.61.2.24-80.el7_9.noarch -y
yum remove iwl6000g2b-firmware-18.168.6.1-80.el7_9.noarch -y
yum remove iwl100-firmware-39.31.5.1-80.el7_9.noarch -y
yum remove iwl3160-firmware-25.30.13.0-80.el7_9.noarch -y
yum remove alsa-tools-firmware-1.1.0-1.el7.x86_64 -y
yum remove ivtv-firmware-20080701-26.el7.noarch -y
yum remove linux-firmware-20200421-80.git78c0348.el7_9.noarch -y
yum remove iwl2030-firmware-18.168.6.1-80.el7_9.noarch -y
yum remove iwl135-firmware-18.168.6.1-80.el7_9.noarch -y
yum remove iwl7260-firmware-25.30.13.0-80.el7_9.noarch -y
yum remove iwl6000g2a-firmware-18.168.6.1-80.el7_9.noarch -y
yum remove iwl1000-firmware-39.31.5.1-80.el7_9.noarch -y
yum remove iwl5000-firmware-8.83.5.1_1-80.el7_9.noarch -y
yum remove iwl5150-firmware-8.24.2.2-80.el7_9.noarch -y
yum remove iwl6000-firmware-9.221.4.1-80.el7_9.noarch -y
yum remove alsa-firmware-1.0.28-2.el7.noarch -y
yum remove centos-logos-70.0.6-3.el7.centos.noarch -y
yum remove mariadb-libs-5.5.68-1.el7.x86_64 -y

配置更新时间

systemctl start chronyd.service
systemctl enable chronyd.service
chronyc -a makestep

日常配置习惯

• 配置VI编辑器

cat >> /etc/virc << EOF
set tabstop=4
set shiftwidth=4
set expandtab
syntax on
set nu
EOF

• 取消ctrl+alt+del 重启系统配置

mv /usr/lib/systemd/system/ctrl-alt-del.target /usr/lib/systemd/system/ctrl-alt-del.target.bak

• 关闭Selinux

sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
setenforce 0

• 关闭 firewalld

systemctl stop firewalld
systemctl disable firewalld

• 清理历史记录，删除ssh公钥信息

echo "">/var/log/wtmp && echo "">~/.bash_history && rm -rf /etc/ssh/ssh_host_* && history -c && shutdown -h now 

• 关闭交换分区

swapoff -a
sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab

• sysctl 关闭IPV6

echo "net.ipv6.conf.all.disable_ipv6=1" >> /etc/sysctl.conf
echo "net.ipv6.conf.default.disable_ipv6=1" >> /etc/sysctl.conf
sysctl -p