系统初始化脚本

CentOS-7.4.1708

# CentOS-7.4.1708
yum clean all && yum makecache
sed -i "s/^#UseDNS.*/UseDNS no/g" /etc/ssh/sshd_config
sed -i "s/SELINUX=.*/SELINUX=disabled/g" /etc/selinux/config
systemctl stop firewalld && systemctl disable firewalld && rpm -e --nodeps firewalld
yum -y install iptables-services
systemctl start iptables && iptables -F && service iptables save
yum -y install lrzsz net-tools patch bash-completion vim tree wget dos2unix ntpdate unzip psmisc  kernel-tools  tcpdump mailx

cat >> ~/.vimrc <<EOF
set ts=4
EOF

curl -sSo /etc/pki/ca-trust/source/anchors/private-ca-root.pem 
  https://gitee.com/outsrkem/my_private_ca_pem/raw/main/pki/ca.pem && /bin/update-ca-trust

 禁用ipv6

vi /etc/default/grub
找到GRUB_CMDLINE_LINUX这一行，在双引号内加入如下内容，注意与其他项目之间使用空格隔开：
GRUB_CMDLINE_LINUX="ipv6.disable=1"

# 命令添加
cp /etc/default/grub{,-`date +%Y%m%d%H%M%S`}
DISALIEIPV6='GRUB_CMDLINE_LINUX="ipv6.disable=1 '
echo "$DISALIEIPV6`cat /etc/default/grub |grep GRUB_CMDLINE_LINUX|awk -F '"' '{print $2}'`""
GRUB_CMDLINE_LINUX="$DISALIEIPV6`cat /etc/default/grub |grep GRUB_CMDLINE_LINUX|awk -F '"' '{print $2}'`""
sed "s/GRUB_CMDLINE_LINUX=.*/${GRUB_CMDLINE_LINUX}/g" /etc/default/grub

# 重新生成grub.cfg
grub2-mkconfig -o /boot/grub2/grub.cfg

grep ipv6 /boot/grub2/grub.cfg

reboot

命令提示符 ：

export PS1='[e[1;32m][u@h W]\$ [e[0m]'

[[a-zA-Z0-9]+@[a-zA-Z0-9-_]+s(~|[a-zA-Z0-9-./+_]+)](#|$)

# CentOS-7.4.1708

echo "export PS1='[e[1;32m][u@h W]\$ [e[0m]'" >> /etc/bashrc

cat << EOF >> /etc/fstab
UUID=2017-09-06-10-53-42-00               /mnt/cdrom              iso9660 defaults        0 0
EOF

mkdir /mnt/cdrom && mount -a

rm -rf /etc/yum.repos.d/*

cat << EOF > /etc/yum.repos.d/CentOS-Media.repo 
# CentOS-Media.repo
#
#  This repo can be used with mounted DVD media, verify the mount point for
#  CentOS-7.  You can use this repo and yum to install items directly off the
#  DVD ISO that we release.
#
# To use this repo, put in your DVD and use it with the other repos too:
#  yum --enablerepo=c7-media [command]
#  
# or for ONLY the media repo, do this:
#
#  yum --disablerepo=* --enablerepo=c7-media [command]

[c7-media]
name=CentOS-$releasever - Media
baseurl=file:///mnt/cdrom/
gpgcheck=0
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
EOF

yum clean all && yum makecache

sed -i "s/^#UseDNS.*/UseDNS no/g" /etc/ssh/sshd_config
sed -i "s/SELINUX=.*/SELINUX=disabled/g" /etc/selinux/config

systemctl stop firewalld && systemctl disable firewalld && rpm -e --nodeps firewalld
yum -y install iptables-services
systemctl start iptables && iptables -F && service iptables save

yum -y install lrzsz net-tools patch bash-completion vim tree wget dos2unix ntpdate unzip psmisc  kernel-tools  tcpdump mailx chrony

cat << EOF >> /etc/vimrc 
set ts=4
EOF


vim /etc/chrony.conf
server cn.pool.ntp.org iburst
server ntp.aliyun.com iburst 
server ntp1.aliyun.com iburst
server ntp2.aliyun.com iburst
server ntp3.aliyun.com iburst
server ntp4.aliyun.com iburst
server ntp5.aliyun.com iburst
server ntp6.aliyun.com iburst

systemctl restart chronyd.service && systemctl enable chronyd.service

timedatectl set-timezone Asia/Shanghai

# 修改主机名 hostnamectl set-hostname host-10-11
# 清除历史命令
# 重启系统