{"id":7614,"date":"2018-06-21T20:40:59","date_gmt":"2018-06-21T12:40:59","guid":{"rendered":"http:\/\/rmohan.com\/?p=7614"},"modified":"2018-06-21T20:40:59","modified_gmt":"2018-06-21T12:40:59","slug":"jboss-too-many-files-open-error","status":"publish","type":"post","link":"https:\/\/mohan.sg\/?p=7614","title":{"rendered":"JBoss Too Many Files Open Error"},"content":{"rendered":"

 <\/p>\n

First of all you want to determine what file(s) remain open. I’m assuming your server runs linux, so once you know JBoss’es PID<\/p>\n

ps ax <\/span>|<\/span> grep something<\/span>-<\/span>that<\/span>-<\/span>makes<\/span>-<\/span>your<\/span>-<\/span>jboss<\/span>-<\/span>process<\/span>-<\/span>unique<\/span><\/code><\/pre>\n
you can do<\/p>\n
ls <\/span>-<\/span>l <\/span>\/<\/span>proc<\/span>\/<\/span>jbosspid<\/span>\/<\/span>fd<\/span><\/code><\/pre>\n
to get a nice list of files that are open at that instant.<\/p>\n
What you’re going to do next depends a bit on what you see here:<\/p>\n
    \n
  1. you may just need to up the number of files the server can open a bit with ulimit (also look at systemwide limits on your server)<\/li>\n
  2. maybe you spot a number of files your application forgot to close<\/li>\n
  3. ….<\/li>\n<\/ol>\n
     <\/p>\n
    Also the max limit is high<\/p>\n
    linux-server:~# cat \/proc\/sys\/fs\/file-max
    \n202989<\/p>\n
    and the max ever occupied is well below the limit:
    \ncat \/proc\/sys\/fs\/file-nr
    \n6304 0 202989<\/p>\n
    all users return the same limit (including the jboss user who initiates the app server):
    \njboss@linux-server:\/home$ ulimit -n<\/p>\n
    A wat to have a look at this is to run the lsof command (only as root) – it will show you all the open file descriptors.<\/p>\n
    In order to fix that, edit the file in \/etc\/security\/limits.conf and add the following lines and restart your jboss.<\/p>\n
    jboss          soft    nofile          <\/span>16384<\/span>\r\njboss          hard    nofile          <\/span>16384<\/span><\/code><\/pre>\n
    (assuming your jboss is run by the “jboss” user)<\/p>\n
     <\/p>\n
     <\/p>\n
    \n