[Gluster-users] One node goes offline, the other node loses its connection to its local Gluster volume
Greg Scott
GregScott at infrasupport.com
Thu Mar 6 22:02:06 UTC 2014
Sorry Anirban, I didn't mean to disappear into a black hole a couple weeks ago. I've been away from this for a while and I just now have a chance to look at the replies. One suggestion was to try an iptables rule instead of ifdown to simulate my outage and I'll try that in a little while and post results.
Meantime, for Anirban - here is gluster volume and gluster volume status from both nodes. I don't know how to answer your heal info question.
>From fw2:
[root at stylmark-fw2 ~]# gluster volume info
Volume Name: firewall-scripts
Type: Replicate
Volume ID: 4928aacb-85eb-40f3-9969-2bfe7f23f08d
Status: Started
Number of Bricks: 1 x 2 = 2
Transport-type: tcp
Bricks:
Brick1: 192.168.253.1:/gluster-fw1/gluster-fw1
Brick2: 192.168.253.2:/gluster-fw2/gluster-fw2
Options Reconfigured:
network.ping-timeout: 5
[root at stylmark-fw2 ~]#
[root at stylmark-fw2 ~]#
[root at stylmark-fw2 ~]# gluster volume status
Status of volume: firewall-scripts
Gluster process Port Online Pid
------------------------------------------------------------------------------
Brick 192.168.253.1:/gluster-fw1/gluster-fw1 49152 Y 1303
Brick 192.168.253.2:/gluster-fw2/gluster-fw2 49152 Y 1294
NFS Server on localhost 2049 Y 1298
Self-heal Daemon on localhost N/A Y 1304
NFS Server on 192.168.253.1 2049 Y 1309
Self-heal Daemon on 192.168.253.1 N/A Y 1314
There are no active volume tasks
[root at stylmark-fw2 ~]#
And from fw1:
[root at stylmark-fw1 ~]# gluster volume linfo
unrecognized word: linfo (position 1)
[root at stylmark-fw1 ~]# gluster volume info
Volume Name: firewall-scripts
Type: Replicate
Volume ID: 4928aacb-85eb-40f3-9969-2bfe7f23f08d
Status: Started
Number of Bricks: 1 x 2 = 2
Transport-type: tcp
Bricks:
Brick1: 192.168.253.1:/gluster-fw1/gluster-fw1
Brick2: 192.168.253.2:/gluster-fw2/gluster-fw2
Options Reconfigured:
network.ping-timeout: 5
[root at stylmark-fw1 ~]#
[root at stylmark-fw1 ~]#
[root at stylmark-fw1 ~]# gluster volume status
Status of volume: firewall-scripts
Gluster process Port Online Pid
------------------------------------------------------------------------------
Brick 192.168.253.1:/gluster-fw1/gluster-fw1 49152 Y 1303
Brick 192.168.253.2:/gluster-fw2/gluster-fw2 49152 Y 1294
NFS Server on localhost 2049 Y 1309
Self-heal Daemon on localhost N/A Y 1314
NFS Server on 192.168.253.2 2049 Y 1298
Self-heal Daemon on 192.168.253.2 N/A Y 1304
There are no active volume tasks
[root at stylmark-fw1 ~]#
- Greg
From: gluster-users-bounces at gluster.org [mailto:gluster-users-bounces at gluster.org] On Behalf Of Chalcogen
Sent: Sunday, February 23, 2014 4:46 AM
To: gluster-users at gluster.org
Subject: Re: [Gluster-users] One node goes offline, the other node loses its connection to its local Gluster volume
I'm not from the glusterfs development team or anything, but I, too started with glusterfs somewhere around the time frame you mention, and also work with a twin-replicated setup just like yours.
When I do what you indicate here on my setup, the command initially hangs, and on both servers for about as long as the peer ping timeout thing (which is defaulted at 48 secs or so). After that it works.
If we can see new bugs in this setup then I would be interested, in part because the stability of my product depends upon this, too. Do you think you could share your glulster volume info and gluster volume status?
Also, what did heal info say before you performed this exercise?
Thanks,
Anirban
On Sunday 23 February 2014 07:14 AM, Greg Scott wrote:
We first went down this path back in July 2013 and now I'm back again for more. It's a similar situation but now with new versions of everything. I'm using glusterfs 3.4.2 with Fedora 20.
I have 2 nodes named fw1 and fw2. When I ifdown the NIC I'm using for Gluster on either node, that node cannot see its Gluster volume, but the other node can see it after a timeout. As soon as I ifup that NIC, everyone can see everything again.
Is this expected behavior? When that interconnect drops, I want both nodes to see their own local copy and then sync everything back up when the interconnect connects again.
Here are details. Node fw1 has an XFS filesystem named gluster-fw1. Node fw2 has an XFS filesystem named gluster-fw2. Those are both gluster bricks and both nodes mount the bricks as /firewall-scripts. So anything one node does in /firewall-scripts should also be on the other node within a few milliseconds. The test is to isolate the nodes from each other and see if they can still access their own local copy of /firewall-scripts. The easiest way to do this is to ifdown the interconnect NIC. But this doesn't work.
Here is what happens when I ifdown the NIC on node fw1. Node fw2 can see /firewall-scripts but fw1 shows an error. When I ifdown on fw2, the behavior is identical, but swapping fw1 and fw2.
On fw1, after an ifdown I lose connection with my Gluster filesystem.
[root at stylmark-fw1 firewall-scripts]# ifdown enp5s4
[root at stylmark-fw1 firewall-scripts]# ls /firewall-scripts
ls: cannot access /firewall-scripts: Transport endpoint is not connected
[root at stylmark-fw1 firewall-scripts]# df -h
df: â/firewall-scriptsâ: Transport endpoint is not connected
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/fedora-root 17G 2.2G 14G 14% /
devtmpfs 989M 0 989M 0% /dev
tmpfs 996M 0 996M 0% /dev/shm
tmpfs 996M 564K 996M 1% /run
tmpfs 996M 0 996M 0% /sys/fs/cgroup
tmpfs 996M 0 996M 0% /tmp
/dev/sda2 477M 87M 362M 20% /boot
/dev/sda1 200M 9.6M 191M 5% /boot/efi
/dev/mapper/fedora-gluster--fw1 9.8G 33M 9.8G 1% /gluster-fw1
10.10.10.2:/fwmaster 214G 75G 128G 37% /mnt/fwmaster
[root at stylmark-fw1 firewall-scripts]#
But on fw2, I can still look at it:
[root at stylmark-fw2 ~]# ls /firewall-scripts
allow-all failover-monitor.sh rcfirewall.conf
allow-all-with-nat initial_rc.firewall start-failover-monitor.sh
etc rc.firewall var
[root at stylmark-fw2 ~]#
[root at stylmark-fw2 ~]#
[root at stylmark-fw2 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/fedora-root 17G 2.3G 14G 14% /
devtmpfs 989M 0 989M 0% /dev
tmpfs 996M 0 996M 0% /dev/shm
tmpfs 996M 560K 996M 1% /run
tmpfs 996M 0 996M 0% /sys/fs/cgroup
tmpfs 996M 0 996M 0% /tmp
/dev/sda2 477M 87M 362M 20% /boot
/dev/sda1 200M 9.6M 191M 5% /boot/efi
/dev/mapper/fedora-gluster--fw2 9.8G 33M 9.8G 1% /gluster-fw2
192.168.253.2:/firewall-scripts 9.8G 33M 9.8G 1% /firewall-scripts
10.10.10.2:/fwmaster 214G 75G 128G 37% /mnt/fwmaster
[root at stylmark-fw2 ~]#
And back to fw1 - after an ifup, I can see it again:
[root at stylmark-fw1 firewall-scripts]# ifup enp5s4
[root at stylmark-fw1 firewall-scripts]#
[root at stylmark-fw1 firewall-scripts]# ls /firewall-scripts
allow-all failover-monitor.sh rcfirewall.conf
allow-all-with-nat initial_rc.firewall start-failover-monitor.sh
etc rc.firewall var
[root at stylmark-fw1 firewall-scripts]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/fedora-root 17G 2.2G 14G 14% /
devtmpfs 989M 0 989M 0% /dev
tmpfs 996M 0 996M 0% /dev/shm
tmpfs 996M 564K 996M 1% /run
tmpfs 996M 0 996M 0% /sys/fs/cgroup
tmpfs 996M 0 996M 0% /tmp
/dev/sda2 477M 87M 362M 20% /boot
/dev/sda1 200M 9.6M 191M 5% /boot/efi
/dev/mapper/fedora-gluster--fw1 9.8G 33M 9.8G 1% /gluster-fw1
192.168.253.1:/firewall-scripts 9.8G 33M 9.8G 1% /firewall-scripts
10.10.10.2:/fwmaster 214G 75G 128G 37% /mnt/fwmaster
[root at stylmark-fw1 firewall-scripts]#
What can I do about this?
Thanks
- Greg Scott
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