unable to connect to node rabbit@localhost: nodedown , despite I copied the cookie all over

[it.av...@gmail.com]

Hi everyone,
I know there are a lot of stuff about this issue but I was unable to find the correct answer.
I'm following this guide trying to set up a pacemaker cluster for RabbitMQ (I know there is a newer way to set rabbitmq clustering but I've been asked to set this one):
https://www.rabbitmq.com/pacemaker.html

I've set up two ubuntu 16.04 machhines called rabbitmq1 & rabbitmq2 (rabbitmq version 3.6.15 Erlang 20.2).
I was able to set DRBD and Corosync succfully with a reource of floating IP between them.
Both machines in the same VLAN and able to ping eachother by name (firewall is off).

After all was set I added a this reource to pacemaker:
configure primitive bunny ocf:rabbitmq:rabbitmq-server params mnesia_base="/media/drbd1"

However this resource showing in error when I run "crm status":
bunny (ocf::rabbitmq:rabbitmq-server): FAILED (unmanaged)[ rabbitmq2 rabbitmq1 ]

when I try to investigate it by command "pcs resource debug-start bunny" I see this output:

stderr: INFO: Status of node rabbit@localhost Error: unable to connect to node rabbit@localhost: nodedown DIAGNOSTICS =========== attempted to contact: [rabbit@localhost] rabbit@localhost: erlang-solutions_1.0_all.deb connected to epmd (port 4369) on localhost erlang-solutions_1.0_all.deb epmd reports node 'rabbit' running on port 25672 erlang-solutions_1.0_all.deb TCP connection succeeded but Erlang distribution failed erlang-solutions_1.0_all.deb Hostname mismatch: node "rabbit@rabbitmq1" believes its host is different. Please ensure that hostnames resolve the same way locally and on "rabbit@rabbitmq1" current node details: - node name: 'rabbitmq-cli-65@rabbitmq1' - home dir: /var/lib/rabbitmq - cookie hash: O9bMZ3LMnkSPaakjdRYHuw==

stderr: ERROR: Unexpected return from rabbitmqctl -n rabbit@localhost status: 69

Then I run this command "rabbitmqctl -n rabbit@localhost status" and get this output:

Error: unable to connect to node rabbit@localhost: nodedown

DIAGNOSTICS

attempted to contact: [rabbit@localhost]

rabbit@localhost:

• connected to epmd (port 4369) on localhost

• epmd reports node 'rabbit' running on port 25672

• TCP connection succeeded but Erlang distribution failed

• Hostname mismatch: node "rabbit@rabbitmq1" believes its host is different. Please ensure that hostnames resolve the same way locally and on "rabbit@rabbitmq1"

current node details:

• node name: 'rabbitmq-cli-30@rabbitmq1'
• home dir: /var/lib/rabbitmq
• cookie hash: O9bMZ3LMnkSPaakjdRYHuw==

I tried copying this erlang cookie file to all usere home folder from this location /var/lib/rabbitmq/.erlang.cookie (both to the home folder of root user and to the home folder or rabbitmq user) but its not helping.
what am I doing wrong?

[Michael Klishin]

Have you checked the suggestion in

> Hostname mismatch: node "rabbit@rabbitmq1" believes its host is different. Please ensure that hostnames resolve the same way locally and on "rabbit@rabbitmq1"

You can see what name the node is using in its log file. The same node must be used with CLI tools.

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MK

Staff Software Engineer, Pivotal/RabbitMQ

[it.av...@gmail.com]

Hi Michael,

Thank you for your reply.

I tried copying the .erlang.cookie file from  /var/lib/rabbitmq/ to all users home folders.

Also I've set a /etc/rabbitmq/rabbitmq-env.conf file with this setting in it:

NODENAME=rabbit@rabbitmq1

However, I still get the same error, should I set it in other way?

If so, can you guide me how?

Tnx

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[Michael Klishin]

Please read the error message I quoted.

The problem is not with the cookie location. If a node believes its name is X and a CLI tool tries to

contact it as node Y, connection will be refused.

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MK

Staff Software Engineer, Pivotal/RabbitMQ

[it.av...@gmail.com]

Hi Michael,

How can i fix this? I was unable to understand how to do so.

I tried setting it in the file /etc/rabbitmq/rabbitmq-env.conf:

NODENAME=rabbit@rabbitmq1

NODE_IP_ADDRESS=172.29.87.115

NODE_PORT=5672

HOME=/var/lib/rabbitmq

LOG_BASE=/var/log/rabbitmq

How should I set it in a command for the CLI tool? can you provide me with the command?

thank you for your help on this

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MK

Staff Software Engineer, Pivotal/RabbitMQ

[Michael Klishin]

Pass the same node name the server uses as -n to CLI tools.

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