title: mongodump error "Failed: error reading from db: EOF" (no entries in server log)
body: <p>Our mongodb.conf of version 3.06 and data files only 240 MB in size. Network is reliable at this timestamps.</p>
  
  <pre><code># mongod.conf
  
  # Where to store the data.
  
  # Note: if you run mongodb as a non-root user (recommended) you may
  # need to create and set permissions for this directory manually,
  # e.g., if the parent directory isn't mutable by the mongodb user.
  dbpath=/db/db32/mongodb/data/
  
  # path to logfile
  logpath=/db/db32/mongodb/logs/mongod.log
  
  # add new entries to the end of the logfile
  logappend=true
  
  # Listen to local interface only. Comment out to listen on all interfaces.
  #bind_ip = 127.0.0.1
  
  # enable operation journaling
  #journal = true
  #smallfiles = true
  nojournal = true
  
  # Enables periodic logging of CPU utilization and I/O wait
  cpu = true
  
  # enable database authentication for users connecting from remote hosts
  auth = true
  
  # Verbose logging output.
  #verbose = true
  
  # Enable db quota management
  #quota = true
  
  # Set oplogging level where n is
  #   0=off (default)
  #   1=W
  #   2=R
  #   3=both
  #   7=W+some reads
  #diaglog = 0
  
  # Ignore query hints
  #nohints = true
  
  # Turns off server-side scripting.  This will result in greatly limited
  # functionality
  noscripting = true
  
  # Turns off table scans.  Any query that would do a table scan fails.
  #notablescan = true
  
  # Disable data file preallocation.
  #noprealloc = true
  
  # Specify .ns file size for new databases.
  # nssize = &lt;size&gt;
  
  # Replication Options
  
  # in replicated mongo databases, specify the replica set name here
  #replSet=setname
  # maximum size in megabytes for replication operation log
  #oplogSize=1024
  # path to a key file storing authentication info for connections
  # between replica set members
  #keyFile=/path/to/keyfile
  
  # Forces the mongod to validate all requests from clients
  objcheck = true
  
  # Disable HTTP status interface
  nohttpinterface = true
  
  # disable REST interface
  rest = false
  
  # database profiling 1 = only includes slow operations
  profile = 1
  
  # logs slow queries to the log
  slowms = 100
  
  # maximum number of simultaneous connections
  maxConns = 25
  </code></pre>
  
  <p>mongodump with verbose flag. In server log no entries to this timestamp.</p>
  
  <pre><code>(...)
  2016-03-09T16:51:17.378+0100    enqueued collection 'Tetzi005.xxx'
  2016-03-09T16:51:17.384+0100    enqueued collection 'Tetzi005.xxxxxx'
  2016-03-09T16:51:17.391+0100    enqueued collection 'Tetzi005.system.indexes'
  2016-03-09T16:51:17.391+0100    finalizing intent manager with longest task first prioritizer
  2016-03-09T16:51:17.391+0100    dumping with 8 job threads
  2016-03-09T16:51:17.391+0100    starting dump routine with id=0
  2016-03-09T16:51:17.391+0100    starting dump routine with id=4
  2016-03-09T16:51:17.391+0100    starting dump routine with id=1
  2016-03-09T16:51:17.391+0100    writing Tetzi005.DailyEmailUser to dbbackup/dump/Tetzi005/xxxxxxx.bson
  2016-03-09T16:51:17.391+0100    starting dump routine with id=3
  2016-03-09T16:51:17.391+0100    starting dump routine with id=6
  2016-03-09T16:51:17.391+0100    writing Tetzi005.Prototype to dbbackup/dump/Tetzi005/xxxxxxx.bson
  2016-03-09T16:51:17.392+0100    starting dump routine with id=7
  2016-03-09T16:51:17.392+0100    writing Tetzi005.ProfileUser to dbbackup/dump/Tetzi005/xxxxxxx.bson
  2016-03-09T16:51:17.392+0100    starting dump routine with id=2
  2016-03-09T16:51:17.392+0100    writing Tetzi005.OrganizationDataSet to dbbackup/dump/Tetzi005/xxxxxxxx.bson
  2016-03-09T16:51:17.392+0100    writing Tetzi005.DailyUserCount to dbbackup/dump/Tetzi005/xxxxxxxxxx.bson
  2016-03-09T16:51:17.392+0100    writing Tetzi005.DailyEmailOrganization to dbbackup/dump/Tetzi005/xxxxxxxxxxxxx.bson
  2016-03-09T16:51:17.392+0100    starting dump routine with id=5
  2016-03-09T16:51:17.392+0100    writing Tetzi005.OrganizationStatistics to dbbackup/dump/Tetzi005/xxxxxxxxxxx.bson
  2016-03-09T16:51:17.392+0100    writing Tetzi005.Organization to dbbackup/dump/Tetzi005/xxxx.bson
  2016-03-09T16:51:17.398+0100        counted 112 documents in Tetzi005.xxxxxxxxxxxxx
  2016-03-09T16:51:17.398+0100        counted 475 documents in Tetzi005.xxxxxxxx
  2016-03-09T16:51:17.405+0100    Failed: error reading from db: EOF
  </code></pre>
  
  <p>No solutions when googling for <code>Failed: error reading from db: EOF</code></p>
  
  <p>We have this problem only with <code>large</code> plan. Technically the configuration doesn't differ (expect memory, disk and maxConns). All mongo Server running in Docker container. Docker runs on OpenStack VMs with RHEL7.</p>
  
  <pre><code>small          Maximum 10 concurrent connections, 1GB storage, 256MB memory   paid   
  medium         Maximum 15 concurrent connections, 8GB storage, 1GB memory     paid   
  large          Maximum 25 concurrent connections, 16GB storage, 4GB memory    paid   
  </code></pre>