[root@bigdata01 ~]# wget http://dl.mycat.io/1.6.5/Mycat-server-1.6.5-release-20180122220033-linux.tar.gz
--2021-07-10 14:14:33--  http://dl.mycat.io/1.6.5/Mycat-server-1.6.5-release-20180122220033-linux.tar.gz
Resolving dl.mycat.io (dl.mycat.io)... failed: Name or service not known.
wget: unable to resolve host

解决方案：

# 编辑/etc/hosts文件,添加 210.51.26.184  dl.mycat.io配置
vim /etc/hosts
210.51.26.184  dl.mycat.io
root@bigdata01 ~]# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
210.51.26.184  dl.mycat.io