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Editorial Team
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Asked: 2026-06-17T21:46:17+00:00

How do I increase the number of sockets that may be opened on ubuntu

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How do I increase the number of sockets that may be opened on ubuntu when using Mina 2.0.8? Once my server reaches around ~1700 connections, I get this in my logs:

2013-01-24 04:21:49,465 [NioSocketAcceptor-1] WARN  o.a.m.util.DefaultExceptionMonitor - Unexpected exception.
java.io.IOException: Too many open files
    at sun.nio.ch.ServerSocketChannelImpl.accept0(Native Method) ~[na:1.6.0_20]
    at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:163) ~[na:1.6.0_20]
    at org.apache.mina.transport.socket.nio.NioSocketAcceptor.accept(NioSocketAcceptor.java:159) ~[mina-core-2.0.8-SNAPSHOT.jar:na]
    at org.apache.mina.transport.socket.nio.NioSocketAcceptor.accept(NioSocketAcceptor.java:50) ~[mina-core-2.0.8-SNAPSHOT.jar:na]
    at org.apache.mina.core.polling.AbstractPollingIoAcceptor$Acceptor.processHandles(AbstractPollingIoAcceptor.java:506) ~[mina-core-2.0.8-SNAPSHOT.jar:na]
    at org.apache.mina.core.polling.AbstractPollingIoAcceptor$Acceptor.run(AbstractPollingIoAcceptor.java:447) ~[mina-core-2.0.8-SNAPSHOT.jar:na]
    at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64) [mina-core-2.0.8-SNAPSHOT.jar:na]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) [na:1.6.0_20]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) [na:1.6.0_20]
    at java.lang.Thread.run(Thread.java:636) [na:1.6.0_20]

How is this possible when my file handles are set to a max of 331278 for hard and soft?
Running “ulimit -n” reports

331287

and running “sysctl fs.file-nr” reports

fs.file-nr = 1728   0   331287

Contents of /etc/security/limits.conf file

* hard nofile 331287
* soft nofile 331287
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1 Answer

  1. Editorial Team

    Two things seem to have fixed the issue I was having above:

    1. Increasing the file handles for the “root” user specifically since its not included when using “*” in limits.conf.

    2. Editing my init.d script to include force setting the ulimit for the process being created. There is apparently a known issue in Ubuntu dealing with process daemon file handles. This link has the details: http://www.jayway.com/2012/02/11/how-to-really-fix-the-too-many-open-files-problem-for-tomcat-in-ubuntu/

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