5:10 p.m.
I tried to create a gluster volume on the georep node by running:
gluster volume create engine-rep replica 1 georep.nwfiber.com:
/mnt/gluster/engine-rep
I got back an error saying replica must be > 1. So I tried to create it
again:
gluster volume create engine-rep replica 2
georep.nwfiber.com:/mnt/gluster/engine-rep
server2.nwfiber.com:/mnt/gluster/engine-rep
where server2 did not exist. That failed too, but I don't recall the error
message.
gluster is installed, but when I try and start it with the init script, it
fails to start with a complaint about reading the block file; my googling
indicated that's the error you get until you've created a gluster volume,
and that was the first clue to me that maybe I needed to create one first.
So, how do I create a replica 1 volume?
Thinking way ahead, I have a related replica question: Currently my ovirt
nodes are also my gluster nodes (replica 2 arbitrar 1). Eventually I'll
want to pull my gluster off onto dedicated hardware I suspect. If I do so,
do I need 3 servers, or is a replica 2 sufficient? I guess I could have an
ovirt node continue to be an arbitrar... I would eventually like to
distribute my ovirt cluster accross multiple locations with the option for
remote failover (say location A looses all its network and/or power; have
important VMs started at location B in addition to location B's normal
VMs). I assume at this point the recommended arch would be:
2 Gluster servers at each location
Each location has a gluster volume for that location, and is georep for the
other location (so all my data will physically exist on 4 gluster
servers). I probably won't have more than 2 or 3 ovirt hosts at each
location, so I don't expect this to be a "heavy use" system.
Am I on track? I'd be interested to learn what others suggest for this
deployment model.
On Sun, May 14, 2017 at 11:09 PM, Sahina Bose <sabose(a)redhat.com> wrote:
Adding Aravinda
On Sat, May 13, 2017 at 11:21 PM, Jim Kusznir <jim(a)palousetech.com> wrote:
> Hi All:
>
> I've been trying to set up georeplication for a while now, but can't seem
> to make it work. I've found documentation on the web (mostly
> https://gluster.readthedocs.io/en/refactor/Administr
> ator%20Guide/Geo%20Replication/), and I found http://blog.gluster.org/
> 2015/09/introducing-georepsetup-gluster-geo-replication-setup-tool/
>
> Unfortunately, it seems that some critical steps are missing from both,
> and I can't figure out for sure what they are.
>
> My environment:
>
> Production: replica 2 + arbitrator running on my 3-node oVirt cluster, 3
> volumes (engine, data, iso).
>
> New geo-replication: Raspberry Pi3 with USB hard drive shoved in some
> other data closet off-site.
>
> I've installed rasbian-lite, and after much fighting, got
> glusterfs-*-3.8.11 installed. I've created my mountpoint (USB hard drive,
> much larger than my gluster volumes), and then ran the command. I get this
> far:
>
> [ OK] georep.nwfiber.com is Reachable(Port 22)
> [ OK] SSH Connection established root(a)georep.nwfiber.com
> [ OK] Master Volume and Slave Volume are compatible (Version: 3.8.11)
> [NOT OK] Unable to Mount Gluster Volume georep.nwfiber.com:engine-rep
>
> Trying it with the steps in the gluster docs also has the same problem.
> No long files are generated on the slave. Log files on the master include:
>
> [root@ovirt1 geo-replication]# more georepsetup.mount.log
> [2017-05-13 17:26:27.318599] I [MSGID: 100030] [glusterfsd.c:2454:main]
> 0-glusterfs: Started running glusterfs version 3.8.11 (args:
> glusterfs --xlator-option="*dht.lookup-unhashed=off" --volfile-server
> localhost --volfile-id engine -l /var/log/glusterfs/geo-repli
> cation/georepsetup.mount.log --client-pid=-1 /tmp/georepsetup_wZtfkN)
> [2017-05-13 17:26:27.341170] I [MSGID: 101190]
> [event-epoll.c:628:event_dispatch_epoll_worker] 0-epoll: Started thread
> with index 1
> [2017-05-13 17:26:27.341260] E [socket.c:2309:socket_connect_finish]
> 0-glusterfs: connection to ::1:24007 failed (Connection refused
> )
> [2017-05-13 17:26:27.341846] E [glusterfsd-mgmt.c:1908:mgmt_rpc_notify]
> 0-glusterfsd-mgmt: failed to connect with remote-host: local
> host (Transport endpoint is not connected)
> [2017-05-13 17:26:31.335849] I [MSGID: 101190]
> [event-epoll.c:628:event_dispatch_epoll_worker] 0-epoll: Started thread
> with index 2
> [2017-05-13 17:26:31.337545] I [MSGID: 114020] [client.c:2356:notify]
> 0-engine-client-0: parent translators are ready, attempting co
> nnect on transport
> [2017-05-13 17:26:31.344485] I [MSGID: 114020] [client.c:2356:notify]
> 0-engine-client-1: parent translators are ready, attempting co
> nnect on transport
> [2017-05-13 17:26:31.345146] I [rpc-clnt.c:1965:rpc_clnt_reconfig]
> 0-engine-client-0: changing port to 49157 (from 0)
> [2017-05-13 17:26:31.350868] I [MSGID: 114020] [client.c:2356:notify]
> 0-engine-client-2: parent translators are ready, attempting co
> nnect on transport
> [2017-05-13 17:26:31.355946] I [MSGID: 114057]
> [client-handshake.c:1440:select_server_supported_programs]
> 0-engine-client-0: Using P
> rogram GlusterFS 3.3, Num (1298437), Version (330)
> [2017-05-13 17:26:31.356280] I [rpc-clnt.c:1965:rpc_clnt_reconfig]
> 0-engine-client-1: changing port to 49157 (from 0)
> Final graph:
> +-----------------------------------------------------------
> -------------------+
> 1: volume engine-client-0
> 2: type protocol/client
> 3: option clnt-lk-version 1
> 4: option volfile-checksum 0
> 5: option volfile-key engine
> 6: option client-version 3.8.11
> 7: option process-uuid ovirt1.nwfiber.com-25660-2017/
> 05/13-17:26:27:311929-engine-client-0-0-0
> 8: option fops-version 1298437
> 9: option ping-timeout 30
> 10: option remote-host ovirt1.nwfiber.com
> 11: option remote-subvolume /gluster/brick1/engine
> 12: option transport-type socket
> 13: option username 028984cf-0399-42e6-b04b-bb9b1685c536
> 14: option password eae737cc-9659-405f-865e-9a7ef97a3307
> 15: option filter-O_DIRECT off
> 16: option send-gids true
> 17: end-volume
> 18:
> 19: volume engine-client-1
> 20: type protocol/client
> 21: option ping-timeout 30
> 22: option remote-host ovirt2.nwfiber.com
> 23: option remote-subvolume /gluster/brick1/engine
> 24: option transport-type socket
> 25: option username 028984cf-0399-42e6-b04b-bb9b1685c536
> 26: option password eae737cc-9659-405f-865e-9a7ef97a3307
> 27: option filter-O_DIRECT off
> 28: option send-gids true
> 29: end-volume
> 30:
> 31: volume engine-client-2
> 32: type protocol/client
> 33: option ping-timeout 30
> 34: option remote-host ovirt3.nwfiber.com
> 35: option remote-subvolume /gluster/brick1/engine
> 36: option transport-type socket
> 37: option username 028984cf-0399-42e6-b04b-bb9b1685c536
> 38: option password eae737cc-9659-405f-865e-9a7ef97a3307
> 39: option filter-O_DIRECT off
> 40: option send-gids true
> 41: end-volume
> 42:
> 43: volume engine-replicate-0
> 44: type cluster/replicate
> 45: option arbiter-count 1
> 46: option data-self-heal-algorithm full
> 47: option eager-lock enable
> 48: option quorum-type auto
> 49: option shd-max-threads 6
> 50: option shd-wait-qlength 10000
> 51: option locking-scheme granular
> 52: subvolumes engine-client-0 engine-client-1 engine-client-2
> 53: end-volume
> 54:
> 55: volume engine-dht
> 56: type cluster/distribute
> 57: option lock-migration off
> 58: subvolumes engine-replicate-0
> 59: end-volume
> 60:
> 61: volume engine-shard
> 62: type features/shard
> 63: option shard-block-size 512MB
> 64: subvolumes engine-dht
> 65: end-volume
> 66:
> 67: volume engine-write-behind
> 68: type performance/write-behind
> 69: option strict-O_DIRECT on
> 70: subvolumes engine-shard
> 71: end-volume
> 72:
> 73: volume engine-readdir-ahead
> 74: type performance/readdir-ahead
> 75: subvolumes engine-write-behind
> 76: end-volume
> 77:
> 78: volume engine-open-behind
> 79: type performance/open-behind
> 80: subvolumes engine-readdir-ahead
> 81: end-volume
> 82:
> 83: volume engine
> 84: type debug/io-stats
> 85: option log-level INFO
> 86: option latency-measurement off
> 87: option count-fop-hits off
> 88: subvolumes engine-open-behind
> 89: end-volume
> 90:
> 91: volume meta-autoload
> 92: type meta
> 93: subvolumes engine
> 94: end-volume
> 95:
> +-----------------------------------------------------------
> -------------------+
> [2017-05-13 17:26:31.360579] I [MSGID: 114046]
> [client-handshake.c:1216:client_setvolume_cbk] 0-engine-client-0:
> Connected to engine
> -client-0, attached to remote volume '/gluster/brick1/engine'.
> [2017-05-13 17:26:31.360599] I [MSGID: 114047]
> [client-handshake.c:1227:client_setvolume_cbk] 0-engine-client-0: Server
> and Client l
> k-version numbers are not same, reopening the fds
> [2017-05-13 17:26:31.360707] I [MSGID: 108005]
> [afr-common.c:4387:afr_notify] 0-engine-replicate-0: Subvolume
> 'engine-client-0' came
> back up; going online.
> [2017-05-13 17:26:31.360793] I [MSGID: 114035]
> [client-handshake.c:202:client_set_lk_version_cbk] 0-engine-client-0:
> Server lk versi
> on = 1
> [2017-05-13 17:26:31.361284] I [rpc-clnt.c:1965:rpc_clnt_reconfig]
> 0-engine-client-2: changing port to 49158 (from 0)
> [2017-05-13 17:26:31.365070] I [MSGID: 114057]
> [client-handshake.c:1440:select_server_supported_programs]
> 0-engine-client-1: Using P
> rogram GlusterFS 3.3, Num (1298437), Version (330)
> [2017-05-13 17:26:31.365788] I [MSGID: 114046]
> [client-handshake.c:1216:client_setvolume_cbk] 0-engine-client-1:
> Connected to engine
> -client-1, attached to remote volume '/gluster/brick1/engine'.
> [2017-05-13 17:26:31.365821] I [MSGID: 114047]
> [client-handshake.c:1227:client_setvolume_cbk] 0-engine-client-1: Server
> and Client l
> k-version numbers are not same, reopening the fds
> [2017-05-13 17:26:31.366059] I [MSGID: 114035]
> [client-handshake.c:202:client_set_lk_version_cbk] 0-engine-client-1:
> Server lk versi
> on = 1
> [2017-05-13 17:26:31.369948] I [MSGID: 114057]
> [client-handshake.c:1440:select_server_supported_programs]
> 0-engine-client-2: Using P
> rogram GlusterFS 3.3, Num (1298437), Version (330)
> [2017-05-13 17:26:31.370657] I [MSGID: 114046]
> [client-handshake.c:1216:client_setvolume_cbk] 0-engine-client-2:
> Connected to engine
> -client-2, attached to remote volume '/gluster/brick1/engine'.
> [2017-05-13 17:26:31.370683] I [MSGID: 114047]
> [client-handshake.c:1227:client_setvolume_cbk] 0-engine-client-2: Server
> and Client l
> k-version numbers are not same, reopening the fds
> [2017-05-13 17:26:31.383548] I [MSGID: 114035]
> [client-handshake.c:202:client_set_lk_version_cbk] 0-engine-client-2:
> Server lk versi
> on = 1
> [2017-05-13 17:26:31.383649] I [fuse-bridge.c:4147:fuse_init]
> 0-glusterfs-fuse: FUSE inited with protocol versions: glusterfs 7.24 k
> ernel 7.22
> [2017-05-13 17:26:31.383676] I [fuse-bridge.c:4832:fuse_graph_sync]
> 0-fuse: switched to graph 0
> [2017-05-13 17:26:31.385453] I [MSGID: 108031]
> [afr-common.c:2157:afr_local_discovery_cbk] 0-engine-replicate-0:
> selecting local rea
> d_child engine-client-0
> [2017-05-13 17:26:31.396741] I [fuse-bridge.c:5080:fuse_thread_proc]
> 0-fuse: unmounting /tmp/georepsetup_wZtfkN
> [2017-05-13 17:26:31.397086] W [glusterfsd.c:1327:cleanup_and_exit]
> (-->/lib64/libpthread.so.0(+0x7dc5) [0x7f8838df6dc5] -->glusterf
> s(glusterfs_sigwaiter+0xe5) [0x7f883a488cd5]
> -->glusterfs(cleanup_and_exit+0x6b) [0x7f883a488b4b] ) 0-: received
> signum (15), shutti
> ng down
> [2017-05-13 17:26:31.397112] I [fuse-bridge.c:5788:fini] 0-fuse:
> Unmounting '/tmp/georepsetup_wZtfkN'.
> [2017-05-13 17:26:31.413901] I [MSGID: 100030] [glusterfsd.c:2454:main]
> 0-glusterfs: Started running glusterfs version 3.8.11 (args:
> glusterfs --xlator-option="*dht.lookup-unhashed=off" --volfile-server
> georep.nwfiber.com --volfile-id engine -l /var/log/glusterfs/
> geo-replication/georepsetup.mount.log --client-pid=-1
> /tmp/georepsetup_M5poIr)
> [2017-05-13 17:26:31.458733] I [MSGID: 101190]
> [event-epoll.c:628:event_dispatch_epoll_worker] 0-epoll: Started thread
> with index 1
> [2017-05-13 17:26:31.458833] E [socket.c:2309:socket_connect_finish]
> 0-glusterfs: connection to 192.168.8.126:24007 failed (Connecti
> on refused)
> [2017-05-13 17:26:31.458886] E [glusterfsd-mgmt.c:1908:mgmt_rpc_notify]
> 0-glusterfsd-mgmt: failed to connect with remote-host: geore
> p.nwfiber.com (Transport endpoint is not connected)
> [2017-05-13 17:26:31.458900] I [glusterfsd-mgmt.c:1926:mgmt_rpc_notify]
> 0-glusterfsd-mgmt: Exhausted all volfile servers
> [2017-05-13 17:26:31.459173] W [glusterfsd.c:1327:cleanup_and_exit]
> (-->/lib64/libgfrpc.so.0(rpc_clnt_notify+0xdb) [0x7f18d6c89aab]
> -->glusterfs(+0x10309) [0x7f18d73b9309] -->glusterfs(cleanup_and_exit+0x6b)
> [0x7f18d73b2b4b] ) 0-: received signum (1), shutting dow
> n
> [2017-05-13 17:26:31.459218] I [fuse-bridge.c:5788:fini] 0-fuse:
> Unmounting '/tmp/georepsetup_M5poIr'.
> [2017-05-13 17:26:31.459887] W [glusterfsd.c:1327:cleanup_and_exit]
> (-->/lib64/libpthread.so.0(+0x7dc5) [0x7f18d5d20dc5] -->glusterf
> s(glusterfs_sigwaiter+0xe5) [0x7f18d73b2cd5]
> -->glusterfs(cleanup_and_exit+0x6b) [0x7f18d73b2b4b] ) 0-: received
> signum (15), shutti
> ng down
>
> I don't know what to make of that.
>
> On a whim, I thought that perhaps the georep setup does not set up the
> remote volume (I assumed it would, I thought that was what the ssh was
> required for, and none of the instructions mentioned create your
> destination (replication) volume. So I tried to create it, but it won't
> let me create a volume with replica 1. this is already a backup, I don't
> need a backup of a backup. This further supported my thought that the
> volume needs to be created by the georep setup commands.
>
The destination or slave volume needs to be created prior to setting up
the geo-replication session. You should be able to create a replica 1
volume as destination volume. How did you try to create this?
Is glusterd running on georep.nwfiber.com ? And are the gluster ports
open?
> Where am I wrong / what do I need to do to fix this?
>
> --Jim
>
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