[Gluster-users] gluster update question regarding new DNS resolution requirement

[Erik Jacobson]

I missed the other important log snip:

The message "E [MSGID: 101075] [common-utils.c:520:gf_resolve_ip6] 0-resolver: error in getaddrinfo [{family=10}, {ret=Address family for hostname not supported}]" repeated 620 times between [2021-09-20 15:49:23.720633 +0000] and [2021-09-20 15:50:41.731542 +0000]

So I will dig in to the code some here.


On Mon, Sep 20, 2021 at 10:59:30AM -0500, Erik Jacobson wrote:
> Hello all! I hope you are well.
> 
> We are starting a new software release cycle and I am trying to find a
> way to upgrade customers from our build of gluster 7.9 to our build of
> gluster 9.3
> 
> When we deploy gluster, we foribly remove all references to any host
> names and use only IP addresses. This is because, if for any reason a
> DNS server is unreachable, even if the peer files have IPs and DNS, it
> causes glusterd to be unable to reach peers properly. We can't really
> rely on /etc/hosts either because customers take artistic licene with
> their /etc/hosts files and don't realize that problems that can cause.
> 
> So our deployed peer files look something like this:
> 
> uuid=46a4b506-029d-4750-acfb-894501a88977
> state=3
> hostname1=172.23.0.16
> 
> That is, with full intention, we avoid host names.
> 
> When we upgrade to gluster 9.3, we fall over with these errors and
> gluster is now partitioned and the updated gluster servers can't reach
> anybody:
> 
> [2021-09-20 15:50:41.731543 +0000] E [name.c:265:af_inet_client_get_remote_sockaddr] 0-management: DNS resolution failed on host 172.23.0.16
> 
> 
> As you can see, we have defined on purpose everything using IPs but in
> 9.3 it appears this method fails. Are there any suggestions short of
> putting real host names in peer files?
> 
> 
> 
> FYI
> 
> This supercomputer will be using gluster for part of its system
> management. It is how we deploy the Image Objects (squashfs images)
> hosted on NFS today and served by gluster leader nodes and also store
> system logs, console logs, and other data.
> 
> https://www.olcf.ornl.gov/frontier/ 
> 
> 
> Erik
> ________
> 
> 
> 
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