Exercises related DNS server
In this part you'll transfer your current DNS
configuration to a dedicated nameserver
ns1.hdm-stuttgart.cloud
. This one being connected to the
global DNS system allows for publishing your records
worldwide.
-
Dedicated course related DNS server
ns1.hdm-stuttgart.cloud
. -
One subdomain per group e.g. g3.sdi.hdm-stuttgart.cloud corresponding to Group 3.
-
Zone edits require a subdomain specific
hmac
secret key being provided asdnsupdate.sec
file in your personal group entry below the SDI course:hmac-sha512:g3.key:I5sDDS3L1BU...
Note
The per zone secrets are being created using tsig-keygen.
-
Edits become globally visible. Mind the TTL setting: A higher value means you'll have to wait longer until updates become visible.
Key file available in your working group below 113475 Software defined Infrastructure.
$ export HMAC=hmac-sha512:g3.key:YXWSeh3l... $ dig @ns1.hdm-stuttgart.cloud -y $HMAC -t AXFR g3.sdi.hdm-stuttgart.cloud ... g3.sdi.hdm-stuttgart.cloud. 600 IN SOA ns1.hdm-stuttgart.cloud. ... g3.sdi.hdm-stuttgart.cloud. 600 IN NS ns1.hdm-stuttgart.cloud. g3.sdi.hdm-stuttgart.cloud. 600 IN SOA ns1.hdm-stuttgart.cloud. ... g3.key. 0 ANY TSIG hmac-sha512. 1746433052 300 64 bak... ...
See AXFR for details.
export HMAC=hmac-sha512:g3.key:YXWSeh3l... $ nsupdate -y $HMAC > server ns1.hdm-stuttgart.cloud > update add www.g3.sdi.hdm-stuttgart.cloud 10 A 141.62.75.114 > send > quit $ dig +noall +answer @ns1.hdm-stuttgart.cloud www.g3.sdi.hdm-stuttgart.cloud www.g3.sdi.hdm-stuttgart.cloud. 10 IN A 141.62.75.114 $ dig +noall +answer @8.8.8.8 www.g3.sdi.hdm-stuttgart.cloud www.g3.sdi.hdm-stuttgart.cloud. 10 IN A 141.62.75.114
$ nsupdate -y $HMAC
> server ns1.hdm-stuttgart.cloud
> update delete www.g3.sdi.hdm-stuttgart.cloud. 10 IN A 141.62.75.114
> send
> quit
>
$ dig +noall +answer @8.8.8.8 www.g3.sdi.hdm-stuttgart.cloud
$
Note
Examples at DNS Updates with nsupdate
Due to caching it'll however take up to your SOA or record specific settings for this deletion to be reflected globally. The subsequent query result indicates another 7069 seconds to go before issuing the next update:
goik>dig +noall +answer vm2.g03.sdi.hdm-stuttgart.cloud vm2.g03.sdi.hdm-stuttgart.cloud. 7069 IN A 141.62.75.114
No. 17
Enhancing your web server.
Q: |
Enhance your web server from Improve your server's security! by:
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