[Gluster-users] Where does Gluster capture the hostnames from?
ROUVRAIS Cedric
cedric.rouvrais at socgen.com
Mon Sep 23 15:29:27 UTC 2019
Hello,
I guess everyone sort of has his perspective on this topic.
I don't want to take this thread on an off-topic conversation (discussing the merits of having a local hosts file) but I do dissent, and therefore had to respond, on the shortcut that using a local etc/host file creates a fixed network configuration that can never adapt as business needs change. I'm running a k8s infrastructure and actually have local conf files, FWIW.
Regards,
Cédric
-----Original Message-----
From: gluster-users-bounces at gluster.org <gluster-users-bounces at gluster.org> On Behalf Of Joe Julian
Sent: lundi 23 septembre 2019 17:06
To: gluster-users at gluster.org
Subject: Re: [Gluster-users] Where does Gluster capture the hostnames from?
I disagree about it being "best practice" to lock yourself in to a fixed network configuration that can never adapt as business needs change.
There are other resilient ways of ensuring your hostnames resolve consistently (so that your cluster doesn't run loose ;-)).
On 9/23/19 7:38 AM, Strahil wrote:
> Also,
>
> It's more safe to have static entries for your cluster - after all if DNS fails for some reason - you don't want to loose your cluster.A kind of 'Best Practice'.
>
> Best Regards,
> Strahil NikolovOn Sep 23, 2019 15:01, TomK <tomkcpr at mdevsys.com> wrote:
>> Do I *really* need specific /etc/hosts entries when I have IPA?
>>
>> [root at mdskvm-p01 ~]# cat /etc/hosts
>> 127.0.0.1 localhost localhost.localdomain localhost4
>> localhost4.localdomain4
>> ::1 localhost localhost.localdomain localhost6
>> localhost6.localdomain6
>> [root at mdskvm-p01 ~]#
>>
>> I really shouldn't need too. ( Ref below, everything resolves fine.
>> )
>>
>> Cheers,
>> TK
>>
>>
>> On 9/23/2019 1:32 AM, Strahil wrote:
>>> Check your /etc/hosts for an entry like:
>>> 192.168.0.60 mdskvm-p01.nix.mds.xyz mdskvm-p01
>>>
>>> Best Regards,
>>> Strahil NikolovOn Sep 23, 2019 06:58, TomK <tomkcpr at mdevsys.com> wrote:
>>>> Hey All,
>>>>
>>>> Take the two hosts below as example. One host shows NFS Server on
>>>> 192.168.0.60 (FQDN is mdskvm-p01.nix.mds.xyz).
>>>>
>>>> The other shows mdskvm-p02 (FQDN is mdskvm-p02.nix.mds.xyz).
>>>>
>>>> Why is there no consistency or correct hostname resolution? Where
>>>> does gluster get the hostnames from?
>>>>
>>>>
>>>> [root at mdskvm-p02 glusterfs]# gluster volume status Status of
>>>> volume: mdsgv01 Gluster process TCP
>>>> Port RDMA Port Online Pid
>>>> -------------------------------------------------------------------
>>>> ----------- Brick mdskvm-p02.nix.mds.xyz:/mnt/p02-d01/g
>>>> lusterv02 49153 0 Y
>>>> 17503
>>>> Brick mdskvm-p01.nix.mds.xyz:/mnt/p01-d01/g
>>>> lusterv01 49153 0 Y
>>>> 15044
>>>> NFS Server on localhost N/A N/A N
>>>> N/A Self-heal Daemon on localhost N/A N/A
>>>> Y
>>>> 17531
>>>> NFS Server on 192.168.0.60 N/A N/A N
>>>> N/A Self-heal Daemon on 192.168.0.60 N/A N/A
>>>> Y
>>>> 15073
>>>>
>>>> Task Status of Volume mdsgv01
>>>> -------------------------------------------------------------------
>>>> -----------
>>>> There are no active volume tasks
>>>>
>>>> [root at mdskvm-p02 glusterfs]#
>>>>
>>>>
>>>>
>>>>
>>>> [root at mdskvm-p01 ~]# gluster volume status Status of volume:
>>>> mdsgv01 Gluster process TCP Port RDMA
>>>> Port Online Pid
>>>> -------------------------------------------------------------------
>>>> ----------- Brick mdskvm-p02.nix.mds.xyz:/mnt/p02-d01/g
>>>> lusterv02 49153 0 Y
>>>> 17503
>>>> Brick mdskvm-p01.nix.mds.xyz:/mnt/p01-d01/g
>>>> lusterv01 49153 0 Y
>>>> 15044
>>>> NFS Server on localhost N/A N/A N
>>>> N/A Self-heal Daemon on localhost N/A N/A
>>>> Y
>>>> 15073
>>>> NFS Server on mdskvm-p02 N/A N/A N
>>>> N/A Self-heal Daemon on mdskvm-p02 N/A N/A
>>>> Y
>>>> 17531
>>>>
>>>> Task Status of Volume mdsgv01
>>>> -------------------------------------------------------------------
>>>> -----------
>>>> There are no active volume tasks
>>>>
>>>> [root at mdskvm-p01 ~]#
>>>>
>>>>
>>>>
>>>> But when verifying everything all seems fine:
>>>>
>>>>
>>>> (1):
>>>> [root at mdskvm-p01 glusterfs]# dig -x 192.168.0.39 ;; QUESTION
>>>> SECTION:
>>>> ;39.0.168.192.in-addr.arpa. IN PTR
>>>>
>>>> ;; ANSWER SECTION:
>>>> 39.0.168.192.in-addr.arpa. 1200 IN PTR mdskvm-p02.nix.mds.xyz.
>>>> [root at mdskvm-p01 glusterfs]# hostname -f mdskvm-p01.nix.mds.xyz
>>>> [root at mdskvm-p01 glusterfs]# hostname -s
>>>> mdskvm-p01
>>>> [root at mdskvm-p01 glusterfs]# hostname mdskvm-p01.nix.mds.xyz
>>>> [root at mdskvm-p01 glusterfs]#
>>>>
>>>>
>>>> (2):
>>>>
>>>> [root at mdskvm-p02 glusterfs]# dig -x 192.168.0.60 ;; QUESTION
>>>> SECTION:
>>>> ;60.0.168.192.in-addr.arpa. IN PTR
>>>>
>>>> ;; ANSWER SECTION:
>>>> 60.0.168.192.in-addr.arpa. 1200 IN PTR mdskvm-p01.nix.mds.xyz.
>>>>
>>>> [root at mdskvm-p02 glusterfs]# hostname -s
>>>> mdskvm-p02
>>>> [root at mdskvm-p02 glusterfs]# hostname -f mdskvm-p02.nix.mds.xyz
>>>> [root at mdskvm-p02 glusterfs]# hostname mdskvm-p02.nix.mds.xyz
>>>> [root at mdskvm-p02 glusterfs]#
>>>>
>>>>
>>>> Gluster version used is:
>>>>
>>>> [root at mdskvm-p01 glusterfs]# rpm -aq|grep -Ei gluster
>>>> glusterfs-server-3.12.15-1.el7.x86_64
>>>> glusterfs-client-xlators-3.12.15-1.el7.x86_64
>>>> glusterfs-rdma-3.12.15-1.el7.x86_64
>>>> glusterfs-3.12.15-1.el7.x86_64
>>>> glusterfs-events-3.12.15-1.el7.x86_64
>>>> libvirt-daemon-driver-storage-gluster-4.5.0-10.el7_6.12.x86_64
>>>> glusterfs-libs-3.12.15-1.el7.x86_64
>>>> glusterfs-fuse-3.12.15-1.el7.x86_64
>>>> glusterfs-geo-replication-3.12.15-1.el7.x86_64
>>>> python2-gluster-3.12.15-1.el7.x86_64
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