ns2.vds.sh has no CNAME records.
Question and response
Question
dig ns2.vds.sh. NS
Answer
The response has no answer records.
Authority
vds.sh. 10 SOA ns1.skystark.net. support.skystark.net. 1772742617 300 60 3600 10
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0