CODEWITHSUNDEEP
rabbitmqrabbitmq-exchangerabbitmqctl
faruk.kuscan
faruk.kuscan

Reputation: 499

Rabbitmq File Descriptor Limit

Rabbitmq documentation says that we need to do some configuration before we use it on production. One of the configuration is about maximum open file number (which is an OS parameter).

Rabbitmq server we use is running on Ubuntu 16.04 and according to resources I found on web, I updated the number of open files as 500k. When I check it from command line, I get the following output:

root@madeleine:~# ulimit -n
500000

However when I look at the rabbitmq server status, I see another number.

root@madeleine:~# rabbitmqctl status | grep 'file_descriptors' -A 4
 {file_descriptors,
     [{total_limit,924},
      {total_used,19},
      {sockets_limit,829},
      {sockets_used,10}]},

It seems like, I managed to increase the limit on OS side, but rabbitmq still thinks that total limit of file descriptors is 924.

What might be causing this problem?

Upvotes: 9

Views: 21492

Answers (3)

Surakshith
Surakshith

Reputation: 141

On Rocky Linux 9 the service was located in "/etc/systemd/system/multi-user.target.wants/rabbitmq-server.service". There was no "/etc/systemd/system/rabbitmq-server.service.d" location. I had to create an override file by running the below command

systemctl edit rabbitmq-server.service

Enter a comment and then save the file (If no changes to the override.conf file the /etc/ location will not be created). The override file will be saved in "/etc/systemd/system/rabbitmq-server.service.d/override.conf"

Now create a file limits.conf with following contents

vi /etc/systemd/system/rabbitmq-server.service.d/limits.conf

[Service]
LimitNOFILE=64000

I also followed the instructions in https://ro-che.info/articles/2017-03-26-increase-open-files-limit as suggested in RabbitMQ networking guide https://www.rabbitmq.com/docs/networking#open-file-handle-limit

Upvotes: 0

ahmetcetin
ahmetcetin

Reputation: 2990

You might want to look at this page

Apparently, this operation depends on the OS version. If you have a systemd, you should do the following in /etc/systemd/system/rabbitmq-server.service.d/limits.conf file:

Notice that this service configuration might be somewhere else according to the operating system you are using. You can use the following command to find where this service configuration is located and update that file.

find / -name "*rabbitmq-server.service*"

[Service]

LimitNOFILE=300000

On the other hand, if you do not have the systemd folder, you should try this in your rabbitmq-env.conf file:

ulimit -S -n 4096

Upvotes: 11

ilker Kopan
ilker Kopan

Reputation: 51

Increase / Set maximum number of open files

sudo sysctl -w fs.file-max=65536
These limits are defined in /etc/security/limits.conf

sudo nano /etc/security/limits.conf
and set

soft nofile 65536
hard nofile 65536
Per user settings for rabbitmq process can also be set in /etc/default/rabbitmq-server

sudo nano /etc/default/rabbitmq-server
and set

ulimit -n 65536
Then reboot the server for changes to take effect.

Upvotes: 2

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