Updates chapter1.md

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Updates chapter1.md
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chapter1.md
@@ -16,5 +16,10 @@ cat /etc/centos-release
 rpm -qa|grep chrony
 // 没有找到，yum安装
 yum install chrony -y
+// 启动chrony服务，加入开机启动项，查看状态
+systemctl enable chronyd.service
+systemctl restart chronyd.service
+systemctl status chronyd.service
+
  
 ```