Updates chapter1.md

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Updates chapter1.md
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chapter1.md
@@ -33,6 +33,10 @@ timedatectl set-ntp 1
 //------------ 3、安装httpd及配置 -------------//
 // 查看是否安装了httpd
 rpm -qa | grep httpd
+// 安装epel-release
+yum -y install epel-release
+// 安装httpd
+yum -y install httpd