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Editorial Team
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Asked: 2026-06-06T11:08:52+00:00

I’m trying to get mongodb started on a NUMA machine as a daemon. When

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I’m trying to get mongodb started on a NUMA machine as a daemon. When I run

numactl --interleave=all mongod &

Mongo starts and runs correctly, but all the output still shows up. (e.g., Fri Jun 22 12:10:29 [initandlisten] connection accepted from 127.0.1.1:51837)

However, when I start mongo on its own (like below), it fails (logs below):

service mongodb start

I get the following in the logs

Fri Jun 22 12:08:41 [initandlisten] MongoDB starting : pid=3348 port=27017 dbpath=/var/lib/mongodb 64-bit host=beckett
Fri Jun 22 12:08:41 [initandlisten]
Fri Jun 22 12:08:41 [initandlisten] ** WARNING: You are running on a NUMA machine.
Fri Jun 22 12:08:41 [initandlisten] **          We suggest launching mongod like this to avoid performance problems:
Fri Jun 22 12:08:41 [initandlisten] **              numactl --interleave=all mongod [other options]
Fri Jun 22 12:08:41 [initandlisten]
Fri Jun 22 12:08:41 [initandlisten] db version v2.0.6, pdfile version 4.5
Fri Jun 22 12:08:41 [initandlisten] git version: e1c0cbc25863f6356aa4e31375add7bb49fb05bc
Fri Jun 22 12:08:41 [initandlisten] build info: Linux ip-10-110-9-236 2.6.21.7-2.ec2.v1.2.fc8xen #1 SMP Fri Nov 20 17:48:28 EST 2009 x86_64 BOOST_LIB_VERSION=1_41
Fri Jun 22 12:08:41 [initandlisten] options: { auth: "true", command: [ "run" ], config: "/etc/mongodb.conf", dbpath: "/var/lib/mongodb", logappend: "true", logpath: "/var/log/mongodb/mongodb.log" }
Fri Jun 22 12:08:41 [initandlisten] journal dir=/var/lib/mongodb/journal
Fri Jun 22 12:08:41 [initandlisten] recover : no journal files present, no recovery needed
Fri Jun 22 12:08:42 [initandlisten] couldn't open /var/lib/mongodb/admin.ns errno:13 Permission denied
Fri Jun 22 12:08:42 [initandlisten] error couldn't open file /var/lib/mongodb/admin.ns terminating
Fri Jun 22 12:08:42 dbexit:
Fri Jun 22 12:08:42 [initandlisten] shutdown: going to close listening sockets...
Fri Jun 22 12:08:42 [initandlisten] shutdown: going to flush diaglog...
Fri Jun 22 12:08:42 [initandlisten] shutdown: going to close sockets...
Fri Jun 22 12:08:42 [initandlisten] shutdown: waiting for fs preallocator...
Fri Jun 22 12:08:42 [initandlisten] shutdown: lock for final commit...
Fri Jun 22 12:08:42 [initandlisten] shutdown: final commit...
Fri Jun 22 12:08:42 [initandlisten] shutdown: closing all files...
Fri Jun 22 12:08:42 [initandlisten] closeAllFiles() finished
Fri Jun 22 12:08:42 [initandlisten] journalCleanup...
Fri Jun 22 12:08:42 [initandlisten] removeJournalFiles
Fri Jun 22 12:08:42 [initandlisten] shutdown: removing fs lock...
Fri Jun 22 12:08:42 dbexit: really exiting now

I don’t know how admin.ns could have a permissions issue while I’m running as root or why when wrapped in numactl it starts up ok. Ideally, I’d like to use numactl in the start_server() function like so:

start_server(){
    /usr/bin/numactl --interleave=all -- \
    start-stop-daemon --background --start --quiet --pidfile $PIDFILE \
        --make-pidfile --chuid $DAEMONUSER \
        --exec $DAEMON -- $DAEMON_OPTS
    errcode=$?
    return $errcode
}

Bottom line, how can I get mongo to start as a daemon on a NUMA machine?

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1 Answer

  1. Editorial Team

    Turns out my problem was a combination of numa and permissions issues. Thanks, @Mark for the help. To start mongodb as a daemon on a NUMA setup, replace the start_server() function in /etc/init.d/mongodb with the following:

    start_server() {
# check for numactl
NUMACTL=$(which numactl)
if [ -n "$NUMACTL" ]; then
    DAEMON_OPTS="--interleave=all ${DAEMON} ${DAEMON_OPTS}"
    DAEMON="$NUMACTL"
fi

# Start the process using the wrapper
            /usr/bin/numactl --interleave=all -- \
            start-stop-daemon --background --start --quiet --pidfile $PIDFILE \
                        --make-pidfile --chuid $DAEMONUSER \
                        --exec $DAEMON -- $DAEMON_OPTS
            errcode=$?
        return $errcode
}
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