Re: Access to Servers hangs after stop one server...

Gilberto Nunes <gilberto.nunes32@xxxxxxxxx> · Thu, 24 Jan 2019 15:20:39 -0200

I just wanna let you know, guys, that I was able to create 2-server HA with bellow cmd:
gluster vol create Vol01 replica 2 transport tcp server1:/data/storage server2:/data/storage
(so here work as replicated mode)

After that, I put this into fstab:
server1:/Vol01 /mnt glusterfs defaults,_netdev,backupvolfile-server=server2 0 0

Then, I shutdown server1 and after a few seconds, the /mnt mounted point works fine.... I could create others files into it and after server1 back online,
the files create was replicated from server2 to server1.

Everything works as expected!

Thanks a lot

---
Gilberto Nunes Ferreira

(47) 3025-5907
(47) 99676-7530 - Whatsapp / Telegram
Skype: gilberto.nunes36

Em qui, 24 de jan de 2019 às 12:04, Scott Worthington <scott.c.worthington@xxxxxxxxx> escreveu:
Amar,

Is this documentation relevant for Diego?

https://gluster.readthedocs.io/en/latest/Administrator%20Guide/Setting%20Up%20Clients/#manual-mount

"If backupvolfile-server option is added while mounting fuse client, when the first volfile server fails, then the server specified in backupvolfile-server option is used as volfile server to mount the client."

Or is there 'better' documentation?

On Thu, Jan 24, 2019 at 8:51 AM Amar Tumballi Suryanarayan <atumball@xxxxxxxxxx> wrote:
Also note that, this way of mounting with a 'static' volfile is not recommended as you wouldn't get any features out of gluster's Software Defined Storage behavior.
this was an approach we used to have say 8 years before. With the introduction of management daemon called glusterd, the way of dealing with volfiles have changed, and it is created with gluster CLI.

About having /etc/fstab not hang when a server is down, search for 'backup-volfile-server' option with glusterfs, and that should be used.

Regards,
Amar

On Thu, Jan 24, 2019 at 7:17 PM Diego Remolina <dijuremo@xxxxxxxxx> wrote:
Show us output of: 
gluster v status

Have you configured firewall rules properly for all ports being used?

Diego

On Thu, Jan 24, 2019 at 8:44 AM Gilberto Nunes <gilberto.nunes32@xxxxxxxxx> wrote:
>I think your mount statement in /etc/fstab is only referencing ONE of the gluster servers.
>
>Please take a look at "More redundant mount" section:
>
>https://www.jamescoyle.net/how-to/439-mount-a-glusterfs-volume
>
>Then try taking down one of the gluster servers and report back results.

Guys! I have followed the very same instruction that found in the James's website.
One of method his mentioned in that website, is create a file into /etc/glusterfs directory, named datastore.vol, for instance, with this content:

volume remote1
 type protocol/client
 option transport-type tcp
 option remote-host server1
 option remote-subvolume /data/storage
 end-volume

 volume remote2
 type protocol/client
 option transport-type tcp
 option remote-host server2
 option remote-subvolume /data/storage
 end-volume

 volume remote3
 type protocol/client
 option transport-type tcp
 option remote-host server3
 option remote-subvolume /data/storage
 end-volume

 volume replicate
 type cluster/replicate
 subvolumes remote1 remote2 remote3
 end-volume

 volume writebehind
 type performance/write-behind
 option window-size 1MB
 subvolumes replicate
 end-volume

 volume cache
 type performance/io-cache
 option cache-size 512MB
 subvolumes writebehind
 end-volume

and then include this line into fstab:

/etc/glusterfs/datastore.vol [MOUNT] glusterfs rw,allow_other,default_permissions,max_read=131072 0 0
What I doing wrong???

Thanks 

---
Gilberto Nunes Ferreira

(47) 3025-5907
(47) 99676-7530 - Whatsapp / Telegram
Skype: gilberto.nunes36

Em qui, 24 de jan de 2019 às 11:27, Scott Worthington <scott.c.worthington@xxxxxxxxx> escreveu:
I think your mount statement in /etc/fstab is only referencing ONE of the gluster servers.

Please take a look at "More redundant mount" section:

https://www.jamescoyle.net/how-to/439-mount-a-glusterfs-volume

Then try taking down one of the gluster servers and report back results.

On Thu, Jan 24, 2019 at 8:24 AM Gilberto Nunes <gilberto.nunes32@xxxxxxxxx> wrote:
Yep! But as I mentioned in previously e-mail, even with 3 or 4 servers this issues occurr.
I don't know what's happen.

---
Gilberto Nunes Ferreira

(47) 3025-5907
(47) 99676-7530 - Whatsapp / Telegram
Skype: gilberto.nunes36

Em qui, 24 de jan de 2019 às 10:43, Diego Remolina <dijuremo@xxxxxxxxx> escreveu:
Glusterfs needs quorum, so if you have two servers and one goes down, there is no quorum, so all writes stop until the server comes back up. You can add a third server as an arbiter which does not store data in the bricks, but still uses some minimal space (to keep metadata for the files).
HTH,

DIego

On Wed, Jan 23, 2019 at 3:06 PM Gilberto Nunes <gilberto.nunes32@xxxxxxxxx> wrote:
Hit there...
I have set up two server as replica, like this:

gluster vol create Vol01 server1:/data/storage server2:/data/storage

Then I create a config file in client, like this:
volume remote1
 type protocol/client
 option transport-type tcp
 option remote-host server1
 option remote-subvolume /data/storage
 end-volume

 volume remote2
 type protocol/client
 option transport-type tcp
 option remote-host server2
 option remote-subvolume /data/storage
 end-volume

 volume replicate
 type cluster/replicate
 subvolumes remote1 remote2
 end-volume

 volume writebehind
 type performance/write-behind
 option window-size 1MB
 subvolumes replicate
 end-volume

 volume cache
 type performance/io-cache
 option cache-size 512MB
 subvolumes writebehind
 end-volume

And add this line in /etc/fstab

/etc/glusterfs/datastore.vol /mnt glusterfs defaults,_netdev 0 0

After mount /mnt, I can access the servers. So far so good!
But when I make server1 crash, I was unable to access /mnt or even use 
gluster vol status
on server2

Everything hangon!

I have tried with replicated, distributed and replicated-distributed too.
I am using Debian Stretch, with gluster package installed via apt, provided by Standard Debian Repo, glusterfs-server 3.8.8-1

I am sorry if this is a  newbie question, but glusterfs share it's not suppose to keep online if one server goes down?

Any adviced will be welcome

Best

---
Gilberto Nunes Ferreira

(47) 3025-5907
(47) 99676-7530 - Whatsapp / Telegram
Skype: gilberto.nunes36

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-- 
Amar Tumballi (amarts)

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