topic Re: Cluster Node installation and the OneAgent user in Dynatrace Managed Q&A

Cluster Node installation and the OneAgent user

gautier_begin — Thu, 30 Nov 2017 11:33:18 GMT

Hello,

During the installation of the cluster node, an oneagent is also installed.

Because any user used by any software must be created by our UNIX team, I'm using the argument "

system-user" . That's working for the server installation, but not for the oneagent installed with. The dtuser is still created and used by the oneagent. How to get by ?

Regards,

Re: Cluster Node installation and the OneAgent user

gautier_begin — Thu, 30 Nov 2017 12:12:39 GMT

Can we install the server without the OneAgent, then install it with custom arguments using the installer script download from the

SELFMON_AGENT_DOWNLOAD_URL

parameter in the server installer config file ?

Re: Cluster Node installation and the OneAgent user

kristof_renders — Thu, 30 Nov 2017 12:17:46 GMT

Hi Gautier,

You can disable the agent installation by adding the following parameter to the installer:

--install-agent <on/off>  enable/disable installation of self-monitoring
                             agent. Default is on

Not sure about being able to install it after the fact, maybe somebody else can answer that one.

KR,
Kristof

Re: Cluster Node installation and the OneAgent user

gautier_begin — Tue, 05 Dec 2017 08:36:17 GMT

Hi Kris,

On already installed node, how to remove the agent ?

Regards,

Re: Cluster Node installation and the OneAgent user

gautier_begin — Wed, 06 Dec 2017 12:28:43 GMT

Hello,

Reinstallation of the node on the same machine, same address IP drives to one issue with the cassandra DB which doesn't want to start.

You get this error message:

ERROR [main] 2017-12-06 12:20:57,938 CassandraDaemon.java:583 - Exception encountered during startup
java.lang.RuntimeException: A node with address /10.137.10.95 already exists, cancelling join. Use cassandra.replace_address if you want to replace this node.
at org.apache.cassandra.service.StorageService.checkForEndpointCollision(StorageService.java:544) ~[apache-cassandra-2.1.18.jar:2.1.18]
at org.apache.cassandra.service.StorageService.prepareToJoin(StorageService.java:794) ~[apache-cassandra-2.1.18.jar:2.1.18]
at org.apache.cassandra.service.StorageService.initServer(StorageService.java:726) ~[apache-cassandra-2.1.18.jar:2.1.18]
at org.apache.cassandra.service.StorageService.initServer(StorageService.java:617) ~[apache-cassandra-2.1.18.jar:2.1.18]
at org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:391) [apache-cassandra-2.1.18.jar:2.1.18]
at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:566) [apache-cassandra-2.1.18.jar:2.1.18

It can be corrected using this workaround:

https://blog.alteroot.org/articles/2014-03-12/replace-a-dead-node-in-cassandra.html

Add in the

cassandra-env.sh

file these lines:

LOCAL_IP=$( nslookup
$(hostname) | awk -F': ' '{if ( $1 == "Address"){print $2}}' )

JVM_OPTS="$JVM_OPTS
-Dcassandra.replace_address=$LOCAL_IP"

Stop/start Cassandra

Remove the lines in
./server/bin/cassandra/conf/cassandra-env.sh

Stop/start Cassandra

Stop/start the server

Resinstallation
finished

Regards,

Re: Cluster Node installation and the OneAgent user

fstekelenburg — Thu, 13 Mar 2025 10:49:43 GMT

Unfortunately the (re)install after question has not been answered.
I started a new topic on this Install OneAgent on Managed Cluster node

But am in contact with support now over this,

Re: Cluster Node installation and the OneAgent user

Radoslaw_Szulgo — Mon, 05 Oct 2020 09:42:10 GMT

just run the uninstaller of OneAgent from /opt/dynatrace/oneagent

or run ./reconfigure with

--install-agent off

Re: Cluster Node installation and the OneAgent user

Radoslaw_Szulgo — Mon, 05 Oct 2020 09:43:34 GMT

To run OneAgent with a different user, run installer with:

--agent-system-user <user:group>