# Installation issue CLuster mode
**URL:** https://community.dremio.com/t/installation-issue-cluster-mode/1728
**Category:** Uncategorized
**Created:** [August 29, 2018, 11:31am UTC](https://community.dremio.com/t/installation-issue-cluster-mode/1728 "2018-08-29T11:31:02Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@rajabhupati](https://community.dremio.com/u/rajabhupati)
#### Post date: [August 29, 2018, 11:31am UTC](https://community.dremio.com/t/installation-issue-cluster-mode/1728/1 "2018-08-29T11:31:02Z")
getting the following error & No log files generated
● dremio.service - Dremio Daemon Server
Loaded: loaded (/etc/systemd/system/dremio.service; enabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Wed 2018-08-29 07:21:03 EDT; 4s ago
Docs: [https://docs.dremio.com](https://docs.dremio.com)
Process: 19620 ExecStop=/opt/dremio/bin/dremio stop (code=exited, status=1/FAILURE)
Process: 19605 ExecStart=/opt/dremio/bin/dremio start-fg (code=exited, status=1/FAILURE)
Main PID: 19605 (code=exited, status=1/FAILURE)
Aug 29 05:48:28 hostname systemd[1]: dremio.service failed.
Aug 29 05:48:28 hostname systemd[1]: Started Dremio Daemon Server.
Aug 29 05:48:28 hostname systemd[1]: Starting Dremio Daemon Server…
Aug 29 05:48:28 hostname dremio[10375]: starting dremio, logging to /opt/dremio/log/server.out
Aug 29 05:48:38 hostname systemd[1]: dremio.service: main process exited, code=exited, status=1/FAILURE
Aug 29 05:48:39 hostname systemd[1]: Unit dremio.service entered failed state.
Aug 29 05:48:39 hostname systemd[1]: dremio.service failed.
I am trying to install on a two node Hadoop using Yarn .How does the other node know this node as master. Do we need to specify the hostname explicitly anywhere?
---
### Author:  [@anthony](https://community.dremio.com/u/anthony)
#### Post date: [August 29, 2018, 12:33pm UTC](https://community.dremio.com/t/installation-issue-cluster-mode/1728/2 "2018-08-29T12:33:42Z")
The nodes know of each other via ZK. If you are deploying in a Hadoop cluster, you should use your external ZK (rather than Dremio’s default internal one) - [https://docs.dremio.com/advanced-administration/zookeeper.html#using-an-external-zookeeper](https://docs.dremio.com/advanced-administration/zookeeper.html#using-an-external-zookeeper)
Also, you only need to deploy the master coordinator one time. You can stand up the executors via UI via Yarn.
---
### Author:  [@rajabhupati](https://community.dremio.com/u/rajabhupati)
#### Post date: [August 30, 2018, 7:36am UTC](https://community.dremio.com/t/installation-issue-cluster-mode/1728/3 "2018-08-30T07:36:02Z")
> [@anthony](#):
>
> eed to deploy the master coordinator one time
I have two nodes host1 & host2 which is hadoop cluster and both acts as zookeeper. I used setup instructions for both
Master config:
paths: {
# the local path for dremio to store data.
local:“/data/dremio”
dist:“hdfs://namenode/user/dremio”
}
services: {
coordinator.enabled: true,
coordinator.master.enabled:true ,
executor.enabled: false
coordinator.auto-upgrade: false
}
services.coordinator.master.embedded-zookeeper.enabled: false
zookeeper: “host1:2181,[host2.com:2181](http://host2.com:2181)”
Log that I get when i start ~
Exception in thread “main” java.lang.NullPointerException: No Cluster Identity found
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:226)
at com.dremio.dac.daemon.DremioDaemon.checkVersion(DremioDaemon.java:89)
at com.dremio.dac.daemon.DremioDaemon.main(DremioDaemon.java:125)
Executor config:
paths: {
# the local path for dremio to store data.
local: “/data/dremio”
dist:“hdfs://namenode/user/dremio”
}
services: {
coordinator.enabled: false,
coordinator.master.enabled: false,
executor.enabled: true
coordinator.auto-upgrade: false
}
services.coordinator.master.embedded-zookeeper.enabled: false
zookeeper: “host1:2181,[host2.com:2181](http://host2.com:2181)”
No logs generated
Any help
---
### Author:  [@yufeldman](https://community.dremio.com/u/yufeldman)
#### Post date: [August 30, 2018, 3:34pm UTC](https://community.dremio.com/t/installation-issue-cluster-mode/1728/4 "2018-08-30T15:34:48Z")
> [@rajabhupati](#):
>
> Exception in thread “main” java.lang.NullPointerException: No Cluster Identity found
> at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:226)
> at com.dremio.dac.daemon.DremioDaemon.checkVersion(DremioDaemon.java:89)
> at com.dremio.dac.daemon.DremioDaemon.main(DremioDaemon.java:125)
Could you try to delete content of `/data/dremio` directory and restart?
---
### Author:  [@rajabhupati](https://community.dremio.com/u/rajabhupati)
#### Post date: [August 31, 2018, 12:59pm UTC](https://community.dremio.com/t/installation-issue-cluster-mode/1728/5 "2018-08-31T12:59:17Z")
Well that did not helo. However adding JAVA\_HOME to Dremio\_env file helped fixing the error