1、自建yum仓库，分别为网络源和本地源
网络源：
wget https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
yum -y install epel-release-latest-7.noarch.rpm
yum repolist
本地源：
mount /dev/cdrom /mnt/cdrom
cp /mnt/cdrom/Packages/* /mnt/yum
createrepo /mnt/yum
vim /etc/yum.repo.d/CentOS-Base.repo
[base-local]
name=Centos
baseurl=file:///mnt/yum
enable=1
gpgckeck=0
2、编译安装http2.4，实现可以正常访问，并将编译步骤和结果提交。
tar -xvf httpd-2.4.25 -C /usr/src
yum -y install gcc make openssl-devel pcre-devel apr-devel apr-util-devel
cd httpd-2.4.25/
./configure --prefix=/usr/local/httpd
make && make install
/usr/local/httpd/bin/httpd
3、利用sed 取出ifconfig命令中本机的IPv4地址
4、删除/etc/fstab文件中所有以#开头，后面至少跟一个空白字符的行的行首的#和空白字符
sed -nr 's/(^#|^#[[:space:]]+)//p' /etc/fstab