Hi,
Replies inline.
On 09/16/2015 01:34 AM, ML mail wrote:
Thanks for your detailed example. Based on that it looks like my issue is SSH based. Now I have the following two SSH related questions:
1) The setup of a SSH passwordless account on the slave, does it need to be using the same SSH public key as stored by GlusterFS in the
/var/lib/glusterd/geo-replication directory? or can I simply generate my own with ssh-keygen?
You can simply generate on your own with ssh-keygen.
You should be able to login from Master node to Slave node without password.
(<master># ssh root@<slave_ip> ) thats it.
2) is it possible to use another user than root for geo-replication with GlusterFS v3.6?
It is supported in 3.6.5. It involves more steps in addition to below
mentioned(which is for root user).
Please refer the link which you have
mentioned.(http://www.gluster.org/pipermail/gluster-users.old/2015-January/020080.html)
Regards
ML
On Tuesday, September 15, 2015 9:16 AM, Saravanakumar Arumugam <sarumuga@xxxxxxxxxx> wrote:
Hi,
You are right, This tool may not be compatible with 3.6.5.
I have tried myself with 3.6.5, but faced this error.
==========================
georepsetup tv1 gfvm3 tv2
Geo-replication session will be established between tv1 and gfvm3::tv2
Root password of gfvm3 is required to complete the setup. NOTE: Password
will not be stored.
root@gfvm3's password:
[ OK] gfvm3 is Reachable(Port 22)
[ OK] SSH Connection established root@gfvm3
[ OK] Master Volume and Slave Volume are compatible (Version: 3.6.5)
[ OK] Common secret pub file present at
/var/lib/glusterd/geo-replication/common_secret.pem.pub
[ OK] common_secret.pem.pub file copied to gfvm3
[ OK] Master SSH Keys copied to all Up Slave nodes
[ OK] Updated Master SSH Keys to all Up Slave nodes authorized_keys file
[NOT OK] Failed to Establish Geo-replication Session
Command type not found while handling geo-replication options
[root@gfvm3 georepsetup]#
==========================
So, some more changes required in this tool.
Coming back to your question:
I have setup geo-replication using the commands in 3.6.5.
Please recheck all the commands (with necessary changes at your end).
====================================================================
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]# cat /etc/redhat-release
Fedora release 21 (Twenty One)
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]# rpm -qa | grep glusterfs
glusterfs-devel-3.6.5-1.fc21.x86_64
glusterfs-3.6.5-1.fc21.x86_64
glusterfs-rdma-3.6.5-1.fc21.x86_64
glusterfs-fuse-3.6.5-1.fc21.x86_64
glusterfs-server-3.6.5-1.fc21.x86_64
glusterfs-debuginfo-3.6.5-1.fc21.x86_64
glusterfs-libs-3.6.5-1.fc21.x86_64
glusterfs-extra-xlators-3.6.5-1.fc21.x86_64
glusterfs-geo-replication-3.6.5-1.fc21.x86_64
glusterfs-api-3.6.5-1.fc21.x86_64
glusterfs-api-devel-3.6.5-1.fc21.x86_64
glusterfs-cli-3.6.5-1.fc21.x86_64
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]# service glusterd start
Redirecting to /bin/systemctl start glusterd.service
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]# service glusterd status
Redirecting to /bin/systemctl status glusterd.service
● glusterd.service - GlusterFS, a clustered file-system server
Loaded: loaded (/usr/lib/systemd/system/glusterd.service; disabled)
Active: active (running) since Tue 2015-09-15 12:19:32 IST; 4s ago
Process: 2778 ExecStart=/usr/sbin/glusterd -p /var/run/glusterd.pid
(code=exited, status=0/SUCCESS)
Main PID: 2779 (glusterd)
CGroup: /system.slice/glusterd.service
└─2779 /usr/sbin/glusterd -p /var/run/glusterd.pid
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]# ps aux | grep glus
root 2779 0.0 0.4 448208 17288 ? Ssl 12:19 0:00
/usr/sbin/glusterd -p /var/run/glusterd.pid
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]# gluster volume create tv1
gfvm3:/opt/volume_test/tv_1/b1 gfvm3:/opt/volume_test/tv_1/b2 force
volume create: tv1: success: please start the volume to access data
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]# gluster volume create tv2
gfvm3:/opt/volume_test/tv_2/b1 gfvm3:/opt/volume_test/tv_2/b2 force
volume create: tv2: success: please start the volume to access data
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]# gluster volume start tv1
volume start: tv1: success
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]# gluster volume start tv2
volume start: tv2: success
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]# mount -t glusterfs gfvm3:/tv1 /mnt/master/
[root@gfvm3 georepsetup]# mount -t glusterfs gfvm3:/tv2 /mnt/slave/
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]# gluster system:: execute gsec_create
Common secret pub file present at
/var/lib/glusterd/geo-replication/common_secret.pem.pub
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]# gluster volume geo-replication tv1 gfvm3::tv2
create push-pem
Creating geo-replication session between tv1 & gfvm3::tv2 has been
successful
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]# gluster volume geo-replication tv1 gfvm3::tv2
start
Starting geo-replication session between tv1 & gfvm3::tv2 has been
successful
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]# gluster volume geo-replication tv1 gfvm3::tv2
status
MASTER NODE MASTER VOL MASTER BRICK SLAVE
STATUS CHECKPOINT STATUS CRAWL STATUS
----------------------------------------------------------------------------------------------------------------------------
gfvm3 tv1 /opt/volume_test/tv_1/b1 gfvm3::tv2
Initializing... N/A N/A
gfvm3 tv1 /opt/volume_test/tv_1/b2 gfvm3::tv2
Initializing... N/A N/A
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]# gluster volume geo-replication tv1 gfvm3::tv2
status
MASTER NODE MASTER VOL MASTER BRICK SLAVE STATUS
CHECKPOINT STATUS CRAWL STATUS
----------------------------------------------------------------------------------------------------------------------
gfvm3 tv1 /opt/volume_test/tv_1/b1 gfvm3::tv2
Active N/A Changelog Crawl
gfvm3 tv1 /opt/volume_test/tv_1/b2 gfvm3::tv2
Active N/A Changelog Crawl
[root@gfvm3 georepsetup]#
[root@gfvm3 georepsetup]# cp /etc/hosts
hosts hosts.allow hosts.deny
[root@gfvm3 georepsetup]# cp /etc/hosts* /mnt/master; sleep 20; ls
/mnt/slave/
hosts hosts.allow hosts.deny
[root@gfvm3 georepsetup]# ls /mnt/master
hosts hosts.allow hosts.deny
[root@gfvm3 georepsetup]# ls /mnt/slave/
hosts hosts.allow hosts.deny
[root@gfvm3 georepsetup]#
====================================================================
One important step which I have NOT mentioned is you need to setup
passwordless ssh.
You need to use ssh-keygen and ssh-copy-id for having passwordless setup
from one node in Master to one node in Slave.
This needs to be carried out before this step: " gluster system::
execute gsec_create"
This needs to be done at the same NODE(at Master) where you execute
geo-rep create command.
You can find geo-replication related logs here
:/var/log/glusterfs/geo-replication/
Please share the logs if you still face any issues.
Thanks,
Saravana
On 09/14/2015 11:23 PM, ML mail wrote:
Yes I can ping the slave node with it's name and IP address, I've even entered manually its name in /etc/hosts.
Does this nice python script also work for Gluster 3.6? The blog post only speaks about 3.7...
Regards
ML
On Monday, September 14, 2015 9:38 AM, Saravanakumar Arumugam <sarumuga@xxxxxxxxxx> wrote:
Hi,
<< Unable to fetch slave volume details. Please check the slave cluster
and slave volume. geo-replication command failed
Have you checked whether you are able to reach the Slave node from the
master node?
There is a super simple way of setting up geo-rep written by Aravinda.
Refer:
http://blog.gluster.org/2015/09/introducing-georepsetup-gluster-geo-replication-setup-tool-2/
Refer the README for both usual (root user based) and
mountbroker(non-root) setup details here:
https://github.com/aravindavk/georepsetup/blob/master/README.md
Thanks,
Saravana
On 09/13/2015 09:46 PM, ML mail wrote:
Hello,
I am using the following documentation in order to setup geo replication between two sites
http://www.gluster.org/pipermail/gluster-users.old/2015-January/020080.html
Unfortunately the step:
gluster volume geo-replication myvolume gfsgeo@xxxxxxxxxxxxxxxxxx::myvolume create push-pem
Fails with the following error:
Unable to fetch slave volume details. Please check the slave cluster and slave volume.
geo-replication command failed
Any ideas?
btw: the documentation
http://gluster.readthedocs.org/en/latest/Administrator%20Guide/Geo%20Replication/index.html
does not seem to work with GlusterFS 3.6.5 that's why I am using the other mentioned documentation. It fails at the mountbroker step (
gluster system:: execute mountbroker opt mountbroker-root /var/mountbroker-root)
Regards
ML
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