Underscore characters are not valid in DNS entries unless you want to be pedantic and read through the RFCs involved in DNS. Use dash characters instead and youll be fine.
https://stackoverflow.com/questions/2180465/can-domain-name-subdomains-have- an-underscore-in-it From: Robinson, Clive <clive.robin...@dxc.com> Sent: Tuesday, November 30, 2021 4:06 AM To: xCAT Users Mailing list <xcat-user@lists.sourceforge.net> Subject: Re: [xcat-user] DNS issue Hi Mark, Having a late one so thought Id respond with the output below. This is a VERY simple flat set-up with a solitary MN and 10x CN in scope to be deployed to. hn_01:~ # ip -4 a show 2>&1| grep inet inet 127.0.0.1/8 scope host lo inet 172.18.10.31/16 brd 172.18.255.255 scope global eth0 inet 172.19.0.31/16 brd 172.19.255.255 scope global eth1 inet 172.20.10.31/16 brd 172.20.255.255 scope global ib0 hn_01:~ # nslookup -type=A 172.18.10.31 172.18.10.31 Server: 172.18.10.31 Address: 172.18.10.31#53 ** server can't find 31.10.18.172.in-addr.arpa: SERVFAIL hn_01:~ # nslookup -type=A 172.18.10.31 Server: 172.18.10.31 Address: 172.18.10.31#53 ** server can't find 31.10.18.172.in-addr.arpa: SERVFAIL hn_01:~ # hostname hn_01 hn_01:~ # cat /etc/hostname hn_01 hn_01:~ # We were wondering if this might be due to the fact the hostname of the MN contains an underscore. We noticed that the makedns -n command produces heaps of objections to our existing hosts file which has lots more hostnames with underscores in. We have a virtual environment running on a big laptop without any underscores in MN/CN hostnames and noticed weirdness when we introduced a new CN with an underscore in its name. The hostname wasnt tracked in the computes.log and the hostname set initially was just linux which are both effects we see in our real Pre-Prod cluster. This small Pre-prod cluster has a previous (currently disabled) xCAT server running 2.7 on SLES11.3 deploying 11.3 nodes quite happily however despite an underscore in its hostname. Best Regards, Clive Robinson Mobile +44 (0)7771-555269 Planned Time Off: December 21 - January 4 UK Public Holidays: December 27-28, January 3 From: Mark Gurevich <gurev...@us.ibm.com <mailto:gurev...@us.ibm.com> > Sent: 29 November 2021 19:42 To: xCAT Users Mailing list <xcat-user@lists.sourceforge.net <mailto:xcat-user@lists.sourceforge.net> > Subject: Re: [xcat-user] DNS issue Andre, Is this a flat or hierarchical cluster with service nodes ? Can you run the following three commands on the Management node ? ip -4 a show 2>&1| grep inet nslookup -type=A <MN host IP> <MN host IP> nslookup -type=A <MN host IP> Mark Gurevich Poughkeepsie Development Lab HPC Software Development - xCAT "If we knew what it was we were doing, it would not be called research, would it?" --Albert Einstein "Stagneth, Andre" ---11/22/2021 12:50:08 PM---Hi, we set up xCAT 2.14.6 on SLES12SP5 at the MN. From: "Stagneth, Andre" <andre.stagn...@dxc.com <mailto:andre.stagn...@dxc.com> > To: "xCAT Users Mailing list" <xcat-user@lists.sourceforge.net <mailto:xcat-user@lists.sourceforge.net> > Date: 11/22/2021 12:50 PM Subject: [EXTERNAL] [xcat-user] DNS issue _____ Hi, we set up xCAT 2.14.6 on SLES12SP5 at the MN. While running `xcatprobe xcatmn -i eth0 -V` we get error for DNS. All other checks are OK. What is checked here and could be wrong? [mn]: Checking DNS service is configured... [FAIL] Regards, André EntServ Deutschland GmbH: Schickardstraße 32, 71034 Böblingen, Germany - Board of Directors: Joachim Löffler (Chairman) - Registered in Stuttgart: HRB 757510.. DXC Technology Company -- This message is transmitted to you by or on behalf of DXC Technology Company or one of its affiliates. It is intended exclusively for the addressee. The substance of this message, along with any attachments, may contain proprietary, confidential or privileged information or information that is otherwise legally exempt from disclosure. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient of this message, you are not authorized to read, print, retain, copy or disseminate any part of this message. If you have received this message in error, please destroy and delete all copies and notify the sender by return e-mail. Regardless of content, this e-mail shall not operate to bind DXC Technology Company or any of its affiliates to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. --. _______________________________________________ xCAT-user mailing list xCAT-user@lists.sourceforge.net <mailto:xCAT-user@lists.sourceforge.net> https://lists.sourceforge.net/lists/listinfo/xcat-user <https://clicktime.symantec.com/38r7psfcDm1Lv4jwrYfcE8U6xU?u=https%3A%2F%2Fl ists.sourceforge.net%2Flists%2Flistinfo%2Fxcat-user>
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