通过numactl作为守护进程启动mongodb

Question

我正在尝试让mongodb在NUMA机器上作为守护进程启动。当我跑的时候

numactl --interleave=all mongod &

Mongo启动并正常运行，但所有输出仍然显示。(例如，Fri Jun 22 12:10:29初始化并从127.0.1.1:51837接受侦听连接)

然而，当我自己启动mongo时(如下所示)，它失败了(日志如下)：

service mongodb start

我在日志中得到了以下内容

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

我不知道当我以超级用户身份运行时，admin.ns怎么会有权限问题，也不知道为什么当包装在numactl中时，它可以正常启动。理想情况下，我希望在start_server()函数中使用numactl，如下所示：

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
}

归根结底，如何让mongo在NUMA机器上作为守护进程启动？

Answer 1

事实证明，我的问题是numa和权限问题的组合。谢谢你，@Mark帮我的忙。要在NUMA设置上作为守护进程启动mongodb，请将/etc/init.d/mongodb中的start_server()函数替换为以下内容：

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
}

Answer 2

我假设你知道'mongo & numa‘的常见警告(http://www.mongodb.org/display/DOCS/NUMA)，所以我就不再赘述了。

下面是一个使用numa - https://gist.github.com/1364716的mongodb的示例upstart配置文件。

基于此Google Group thread，将以下行添加到初始化脚本中的start_server函数中，并且成功了：

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 

Answer 3

对于ubuntu 16.04

[Unit]
Description=High-performance, schema-free document-oriented database
After=time-sync.target network.target

[Service]
Type=forking
User=mongod
Group=mongod
LimitNOFILE=65000
PermissionsStartOnly=true
EnvironmentFile=/etc/default/mongod
ExecStartPre=/usr/bin/percona-server-mongodb-helper.sh
ExecStart=/usr/bin/env bash -c "numactl --interleave=all /usr/bin/mongod $OPTIONS > ${STDOUT} 2> ${STDERR}"
#ExecStart=/usr/bin/env bash -c "/usr/bin/mongod $OPTIONS > ${STDOUT} 2> ${STDERR}"
PIDFile=/var/run/mongod.pid

[Install]
WantedBy=multi-user.target