mongod：无法识别的服务，mongod.service 已经存在

Question

其他服务如 apache2 等工作正常。但是当我输入时，sudo service mongod start我收到此错误：

mongod: unrecognized service

我有这个文件：

/lib/systemd/system/mongod.service 

它是这样说的：

[Unit]
Description=High-performance, schema-free document-oriented database
After=network.target
Documentation=https://docs.mongodb.org/manual

[Service]
User=mongodb
Group=mongodb
ExecStart=/usr/bin/mongod --quiet --config /etc/mongod.conf
# file size
LimitFSIZE=infinity
# cpu time
LimitCPU=infinity
# virtual memory size
LimitAS=infinity
# open files
LimitNOFILE=64000
# processes/threads
LimitNPROC=64000
# total threads (user+kernel)
TasksMax=infinity
TasksAccounting=false

# Recommended limits for for mongod as specified in
# http://docs.mongodb.org/manual/reference/ulimit/#recommended-settings

[Install]
WantedBy=multi-user.target

Answer 1

拉取 ubuntu:17:04 docker 镜像并安装 mongodb-org 后我遇到了同样的问题

看起来 Mongodb 创建了一个 systemd 启动文件，该文件已经被 upstart 替换了。

作为解决方法：

1. 创建一个新文件/etc/init/mongod.conf（需要 sudo 权限）。您可以使用：sudo gedit /etc/init/mongod.conf

2. 将以下内容粘贴到新创建的 upstart 文件中：

   # Ubuntu upstart file at /etc/init/mongod.conf
   
   # Recommended ulimit values for mongod or mongos
   # See http://docs.mongodb.org/manual/reference/ulimit/#recommended-settings
   #
   limit fsize unlimited unlimited
   limit cpu unlimited unlimited
   limit as unlimited unlimited
   limit nofile 64000 64000
   limit rss unlimited unlimited
   limit nproc 64000 64000
   
   kill timeout 300 # wait 300s between SIGTERM and SIGKILL.
   
   pre-start script
     DAEMONUSER=${DAEMONUSER:-mongodb}
     if [ ! -d /var/lib/mongodb ]; then
       mkdir -p /var/lib/mongodb && chown mongodb:mongodb /var/lib/mongodb
     fi
     if [ ! -d /var/log/mongodb ]; then
       mkdir -p /var/log/mongodb && chown mongodb:mongodb /var/log/mongodb
     fi
     touch /var/run/mongodb.pid
     chown $DAEMONUSER /var/run/mongodb.pid
   end script
   
   start on runlevel [2345]
   stop on runlevel [06]
   
   script
     ENABLE_MONGOD="yes"
     CONF=/etc/mongod.conf
     DAEMON=/usr/bin/mongod
     DAEMONUSER=${DAEMONUSER:-mongodb}
     DAEMONGROUP=${DAEMONGROUP:-mongodb}
   
     if [ -f /etc/default/mongod ]; then . /etc/default/mongod; fi
   
     # Handle NUMA access to CPUs (SERVER-3574)
     # This verifies the existence of numactl as well as testing that the command works
     NUMACTL_ARGS="--interleave=all"
     if which numactl >/dev/null 2>/dev/null && numactl $NUMACTL_ARGS ls / >/dev/null 2>/dev/null
     then
       NUMACTL="$(which numactl) -- $NUMACTL_ARGS"
       DAEMON_OPTS=${DAEMON_OPTS:-"--config $CONF"}
     else
       NUMACTL=""
       DAEMON_OPTS="-- "${DAEMON_OPTS:-"--config $CONF"}
     fi
   
     if [ "x$ENABLE_MONGOD" = "xyes" ]
     then
       exec start-stop-daemon --start \
           --chuid $DAEMONUSER:$DAEMONGROUP \
           --pidfile /var/run/mongodb.pid \
           --make-pidfile \
           --exec $NUMACTL $DAEMON $DAEMON_OPTS
     fi
   end script
   

3. 现在，您可以使用以下命令：

   sudo service mongod start

   sudo service mongod stop

   sudo service mongod status

参考： https://github.com/mongodb/mongo/blob/master/debian/mongod.upstart