Updates chapter1.md

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Updates chapter1.md
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chapter1.md
@@ -14,5 +14,7 @@ cat /etc/centos-release
 //---------- 2、linux时间同步 ----------//
 // 查看是否安装了chrony
 rpm -qa|grep chrony
+// 没有找到，yum安装
+yum install chrony -y
  
 ```