Rabbitmq File Descriptor Limit

Question

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?

Answer 1

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