Unable to increase open file limit

[El-Tommy]

Describe the bug

OS: Ubuntu 20.04
RabbitMQ: 3.12.4

I'm trying to do everything the documentation suggests to increase RabbitMQ's open file descriptor, but it has no effect.

I have already made all the changes below and the result of rabbitmqctl status does not change.

sudo nano /etc/sysctl.conf
fs.file-max=1048576

sudo nano /etc/default/rabbitmq-server
ulimit -S -n 1048576

sudo nano /etc/rabbitmq/rabbitmq-env.conf
ulimit -S -n 1048576
#This action causes the server not to start

This directory and file does not exist: /etc/systemd/system/rabbitmq-server.service.d/limits.conf

And the result of rabbitmqctl status always looks like it always does:

File Descriptors

Total: 6, limit: 32671
Sockets: 0, limit: 29401

And my ulimit is like this:

$ulimit -Sn
1048576

$ulimit -Hn
1048576

Reproduction steps

1. Edit /etc/sysctl.conf, /etc/default/rabbitmq-server and /etc/rabbitmq/rabbitmq-env.conf
2. Run rabbitmqctl status

Expected behavior

Show:

File Descriptors

Total: 6, limit: 1048576

Additional context

No response

[michaelklishin]

This directory and file does not exist

You need to create it. On all modern distributions such limits are managed via systemd.

Before the limit can take effect, you must restart the node (the OS process)

[lukebakken]

@El-Tommy use systemctl edit rabbitmq-server.service to create an override. You can then add or change LimitNOFILE