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Avamar Client and DNS Related questions
Hello folks,
a couple of questions regarding Avamar clients (7.0)
1) Can i use FQDN name inside of Avamar client when i specify Avamar server name ?
2) Can i use FQDN name when i add Data Domain to Avamar grid ?
3) Can forward lookup and reverse lookup be different, for example:
nslookup dd890.mycompany.com <- this would return IP address 10.224.10.23
nslookup 10.224.10.23 < this would return dd890.differentcompany.net
some application would do reverse lookup and if reverse lookup does not match forward lookup they get upset (SSH for example)
Thank you
ionthegeek
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January 31st, 2014 13:00
1) Can i use FQDN name inside of Avamar client when i specify Avamar server name ?
Yes.
2) Can i use FQDN name when i add Data Domain to Avamar grid ?
Yes.
However, if you have your Avamar and Data Domain connected to multiple disjoint networks, you may want to use the short name. The name you assign to Data Domain when you add it to the Avamar grid is the name that will be passed to the clients so using the short name lets each client look up the IP address in its own domain (e.g. for clients in the bkp domain, the FQDN for short name datadomain would be datadomain.bkp.example.com and resolve to 192.168.1.150 but in the prd domain, the FQDN for short name datadomain would be datadomain.prd.example.com and resolve to 10.0.24.150).
3) Can forward lookup and reverse lookup be different, for example:
I haven't heard of any Avamar issues caused by incorrect / inconsistent reverse lookup.
dynamox
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January 31st, 2014 14:00
Ian,
remember this discussion about my network and gazillion subnets
Avamar hardware documentation
So since are planning on using Avamar/DD integration for client level backups and image level backups we wanted to ensure that traffic from different networks does not traverse firewalls. So here is my client network (grossly abbreviated, many more subnets):
DMZ - 10.224.144.0/24
Admin - 160.140.144.0/24
HIPAA - 140.140.144.0/24
Here is my Data Domain:
veth0.2997 yes no 10.199.145.250 - DMZ
veth0.3038 yes no 10.248.145.250 - Admin
veth0.3057 yes no 10.240.145.250 - HIPAA
So if i am a client with ip address 10.224.144.40 i want to make sure that all my backups go to 10.199.145.250 on Data Domain. (client is on DMZ and so is Data Domain). Now since there is only one name by which Data Domain can be discovered within Avamar we are going to have to use DNS View and do some DNS magic where if clients is on 10.224.144.0/24 network and runs nslookup on dd890 ..they will be returned IP address 10.199.145.250. If client is on 160.140.144.0/24 network and runs nslookup on dd890 ..they will be returned IP address 10.248.145.250. DNS Views will be configured in Infoblox appliance.
Currently all servers have cc.mycompany.com suffix and we are thinking for DD to use backup.mycompany.com suffix. Now i don't want to visit every client and append backup.mycompany.com to their resolv.conf files so we might have to resort to using FQDN name for Avamar Grid itself and FQDN name for DD when adding it to Avamar.
Does it make sense ?
ionthegeek
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January 31st, 2014 15:00
DNS magic is an unfortunate necessity in a lot of cases like this.
As long as the name of the Data Domain system configured in Avamar resolves to the correct IP address on each client, the clients should back up fine (barring other issues, of course).
dynamox
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February 3rd, 2014 08:00
Thank you Ian, very much !
ionthegeek
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February 3rd, 2014 08:00
Always happy to help!