I have two nodes and setting up zookeeper (3.5.3) for cluster . Recommended is 3 But i dont have option to get one more node .
Please suggest is there any option by reconfig or weight change etc .
If it is for demo/prototype/experimental purposes, I would suggest you to use vagrant.
I have done this in my host linux machine. I have done a repository and the code is here. If you have linux machine, all that you have to do is vagrant up. Please try and let me know your comments/questions.
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I'm pretty new to Ceph, so I've included all my steps I used to set up my cluster since I'm not sure what is or is not useful information to fix my problem.
I have 4 CentOS 8 VMs in VirtualBox set up to teach myself how to bring up Ceph. 1 is a client and 3 are Ceph monitors. Each ceph node has 6 8Gb drives. Once I learned how the networking worked, it was pretty easy.
I set each VM to have a NAT (for downloading packages) and an internal network that I called "ceph-public". This network would be accessed by each VM on the 10.19.10.0/24 subnet. I then copied the ssh keys from each VM to every other VM.
I followed this documentation to install cephadm, bootstrap my first monitor, and added the other two nodes as hosts. Then I added all available devices as OSDs, created my pools, then created my images, then copied my /etc/ceph folder from the bootstrapped node to my client node. On the client, I ran rbd map mypool/myimage to mount the image as a block device, then used mkfs to create a filesystem on it, and I was able to write data and see the IO from the bootstrapped node. All was well.
Then, as a test, I shutdown and restarted the bootstrapped node. When it came back up, I ran ceph status but it just hung with no output. Every single ceph and rbd command now hangs and I have no idea how to recover or properly reset or fix my cluster.
Has anyone ever had the ceph command hang on their cluster, and what did you do to solve it?
Let me share a similar experience. I also tried some time ago to perform some tests on Ceph (mimic i think) an my VMs on my VirtualBox acted very strange, nothing comparing with actual bare metal servers so please bare this in mind... the tests are not quite relevant.
As regarding your problem, try to see the following:
have at least 3 monitors (or an even number). It's possible that hang is because of monitor election.
make sure the networking part is OK (separated VLANs for ceph servers and clients)
DNS is resolving OK. (you have added the servername in hosts)
...just my 2 cents...
I successfully set up a Ceph Object Storage Cluster based on this tutorial: https://www.twoptr.com/2018/05/installing-ceph-luminous.html.
Now I am stuck because I would like to add an MDS node in order to setup a Ceph Filesystem from that cluster. I have already set up the MDS node and tried to set up the FS, following several different guides and tutorials (e.g. the Ceph docs), but nothing has really worked so far.
I would be very grateful if someone could point me into the right direction of how to do this the right way.
My setup includes 5 VM's with Ubuntu 16.04 server installed:
ceph-1 (mon, mgr, osd.0)
ceph-2 (osd.1)
ceph-3 (osd.2)
ceph-4 (radosgw, client)
ceph-5 (mds)
I also tried to create a pool which seemed to work, because it's showing in the Ceph Dashboard, which I installed on ceph-1. But I am not sure how to continue....
Thank you for your help!
hi your install not Standard
please read a below link very helpfull for install ceph:
http://docs.ceph.com/docs/master/start/quick-ceph-deploy/
then
http://docs.ceph.com/docs/mimic/cephfs/createfs/
for erasure coding below link
http://karan-mj.blogspot.com/2014/04/erasure-coding-in-ceph.html
This is a total beginner question with regards to Docker.
I have a basic swarm running on a single host as a testing environment. There are 11 different containers running, all communicating through the host (the literal machine I am now typing this on). Only 1 physical machine, 11 containers.
On my physical machine's localhost I have a MongoDB server running. I want to be able to communicate with this MongoDB server from within the containers in my swarm.
What do I have to configure to get this working? There is lots of information with regards to networking on Docker. I normally use:
docker run --net="host" --rm -ti <name_of_image>
and everything works fine. But as soon as I run a swarm (not a single container) I can't seem to figure out how to connect everything together so I can talk to my MongoDB server.
I realise this is probably a very basic question. I appreciate also that I probably need to read some more of the swarm networking docs to understand this but I don't know which documentation to look at. There seems to be multiple different ways to network my containers and physical machine together.
Any information would be much appreciated, even if it's just a link to some docs you think would be enlightening.
Cheers.
We have five Wildfly (8.2.0-Final) servers running in different machines on the same network. When I start them, by default they come under a single cluster.
But I don't want this to happen. I want each of them act as a standalone server. I believe in JBoss-5 we can achieve this by passing -g option which would create a separate partition and thus a separate cluster.
Is there any similar option for WildFly? Please suggest. I don't want to run them in a cluster.
Thanks in advance.
If you do not want JBoss Wildfly to start in a cluster, use the non-HA standalone profiles such as standalone.xml or standalone-full.xml if you require messaging/JMS.
Hope it helps.
If you are particular to start with clustering mode and exclude clustering of two instance, change the jgroups address (udp/tcp) while starting
I'm newbie to Zookeeper.Trying to setup clustering server for zookeeper exhibitor to modify the data. I have tried the server setup with 3 nodes, but data modification not reflected on all the zookeeper.
I refereed the following url & also setup the server in the same way. But no use, some thing i'm missing in that config to run it correctly.
http://zookeeper.apache.org/doc/trunk/zookeeperAdmin.html#sc_zkMulitServerSetup
Exhibitor startup command is:
java -jar exhibitor-war-1.0-jar-with-dependencies.jar -c file --nodemodification true --port 9090
Farther I need to add any other config with this to get my data modification reflect on all the zookeeper.
Advance thanks for ur kind time!
I have similar scenario, and I'm on Windows. So I get some problems due to the fact that Exhibitor is Unix-oriented - it tries to restart zkServer.sh (instead of zkServer.bat). So I:
1. have manually started ZK ensemble (all instances get data modifications from each other).
2. set up Exhibitor above every ZK instance - with single network config file.
Hope it helps. If not, give more details.