Am Di, 21.06.2016, 19:22 schrieb Danny Lee:
> Hello,
>
>
> We are currently figuring out how to add GlusterFS to our system to make
> our systems highly available using scripts. We are using Gluster 3.7.11.
>
> Problem:
> Trying to migrate to GlusterFS from a non-clustered system to a 3-node
> glusterfs replicated cluster using scripts. Tried various things to make this work, but it sometimes causes us to be in an
> indesirable state where if you call "gluster volume heal <volname> full", we would get the error message, "Launching heal
> operation to perform full self heal on volume <volname> has been unsuccessful on bricks that are down. Please check if
> all brick processes are running." All the brick processes are running based on running the command, "gluster volume status
> volname"
>
> Things we have tried:
> Order of preference
> 1. Create Volume with 3 Filesystems with the same data
> 2. Create Volume with 2 Empty filesysytems and one with the data
> 3. Create Volume with only one filesystem with data and then using
> "add-brick" command to add the other two empty filesystems
> 4. Create Volume with one empty filesystem, mounting it, and then copying
> the data over to that one. And then finally, using "add-brick" command to add the other two empty filesystems
- should be working
- read each file on /mnt/gvol, to trigger replication [2]
> 5. Create Volume
> with 3 empty filesystems, mounting it, and then copying the data over
- my favorite
>
> Other things to note:
> A few minutes after the volume is created and started successfully, our
> application server starts up against it, so reads and writes may happen pretty quickly after the volume has started. But there
> is only about 50MB of data.
>
> Steps to reproduce (all in a script):
> # This is run by the primary node with the IP Adress, <server-ip-1>, that
> has data systemctl restart glusterd gluster peer probe <server-ip-2> gluster peer probe <server-ip-3> Wait for "gluster peer
> status" to all be in "Peer in Cluster" state gluster volume create <volname> replica 3 transport tcp ${BRICKS[0]} ${BRICKS[1]}
> ${BRICKS[2]} force
> gluster volume set <volname> nfs.disable true gluster volume start <volname> mkdir -p $MOUNT_POINT mount -t glusterfs
> <server-ip-1>:/volname $MOUNT_POINT
> find $MOUNT_POINT | xargs stat
I have written a script for 2 nodes. [1]
but should be at least 3 nodes.
I hope it helps you
regards Heiko
>
> Note that, when we added sleeps around the gluster commands, there was a
> higher probability of success, but not 100%.
>
> # Once volume is started, all the the clients/servers will mount the
> gluster filesystem by polling "mountpoint -q $MOUNT_POINT": mkdir -p $MOUNT_POINT mount -t glusterfs <server-ip-1>:/volname
> $MOUNT_POINT
>
>
> Logs:
> *etc-glusterfs-glusterd.vol.log* in *server-ip-1*
>
>
> [2016-06-21 14:10:38.285234] I [MSGID: 106533]
> [glusterd-volume-ops.c:857:__glusterd_handle_cli_heal_volume] 0-management:
> Received heal vol req for volume volname
> [2016-06-21 14:10:38.296801] E [MSGID: 106153]
> [glusterd-syncop.c:113:gd_collate_errors] 0-glusterd: Commit failed on
> <server-ip-2>. Please check log file for details.
>
>
>
> *usr-local-volname-data-mirrored-data.log* in *server-ip-1*
>
>
> [2016-06-21 14:14:39.233366] E [MSGID: 114058]
> [client-handshake.c:1524:client_query_portmap_cbk] 0-volname-client-0:
> failed to get the port number for remote subvolume. Please run 'gluster volume status' on server to see if brick process is
> running. *I think this is caused by the self heal daemon*
>
>
> *cmd_history.log* in *server-ip-1*
>
>
> [2016-06-21 14:10:38.298800] : volume heal volname full : FAILED : Commit
> failed on <server-ip-2>. Please check log file for details. _______________________________________________
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[1] http://www2.fh-lausitz.de/launic/comp/net/glusterfs/130620.glusterfs.create_brick_vol.howto.txt
- old, limit 2 nodes
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