问题
我的Mongo服务无法再次启动：
root@machine ~ # service mongod start
root@machine ~ # service mongod status
● mongod.service - High-performance, schema-free document-oriented database
Loaded: loaded (/lib/systemd/system/mongod.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Tue 2017-08-15 12:03:51 CEST; 2s ago
Docs: https://docs.mongodb.org/manual
Process: 26942 ExecStart=/usr/bin/mongod --config /etc/mongod.conf (code=exited, status=100)
Main PID: 26942 (code=exited, status=100)
Aug 15 12:03:50 machine systemd[1]: Started High-performance, schema-free document-oriented database.
Aug 15 12:03:51 machine systemd[1]: mongod.service: Main process exited, code=exited, status=100/n/a
Aug 15 12:03:51 machine systemd[1]: mongod.service: Unit entered failed state.
Aug 15 12:03:51 machine systemd[1]: mongod.service: Failed with result 'exit-code'.
当进程抛出未捕获的异常时，mongod 返回退出代码100。
我做了什么
首先按照官方指南在Ubuntu 16.04.2 LTS上安装了MongoDB（版本为3.4.7）。
启动和停止服务都没有问题。因此，我继续按照官方指南启用身份验证。
然后我添加了该服务，以便可以在服务器启动时运行。
root@machine ~ # systemctl enable mongod.service
mongod.conf
我也编辑了我的配置文件，通过了一个YAML linter：
# Where and how to store data.
storage:
dbPath: /var/lib/mongodb
journal:
enabled: true
# engine: mmapv1
# mmapv1:
# wiredTiger:
# where to write logging data.
systemLog:
destination: file
logAppend: true
path: /var/log/mongodb/mongod.log
# network interfaces
net:
port: 27017
bindIp: 127.0.0.1
#processManagement:
security:
authorization: enabled
文件的所有权是
root@machine ~ # ls -la /etc/ | grep mongo
-rw-r--r-- 1 root root 599 Aug 15 11:42 mongod.conf
DbPath
我知道dbpath存在问题，所以这是/var/lib/mongodb的所有权情况：
root@ machine ~ # ls -la /var/lib/ | grep mongo
drwxr-xr-x 4 mongodb mongodb 4096 Aug 15 11:54 mongodb
服务列表
当通过service --status-all列出所有服务时，没有任何与Mongo相关的服务条目。
有人知道是什么原因导致了这个问题吗？
更新
如建议所述，我运行了以下命令（稍作修改）：
root@machine ~ /usr/bin/mongod --verbose --config /etc/mongod.conf &
[1] 28495
当我做得正确时，这是对二进制文件的直接执行。现在这允许我至少登录到mongo shell：
root@machine ~ # mongo
MongoDB shell version v3.4.7
connecting to: mongodb://127.0.0.1:27017
MongoDB server version: 3.4.7
>
然而，服务状态仍为失败，退出代码为100。
更新 更新
当输入root@machine ~ # /usr/bin/mongod --verbose时，我收到以下错误：
2017-08-15T13:45:40.973+0200 I CONTROL [initandlisten] MongoDB starting : pid=28642 port=27017 dbpath=/data/db 64-bit host=machine
2017-08-15T13:45:40.973+0200 I CONTROL [initandlisten] db version v3.4.7
2017-08-15T13:45:40.973+0200 I CONTROL [initandlisten] git version: cf38c1b8a0a8dca4a11737581beafef4fe120bcd
2017-08-15T13:45:40.973+0200 I CONTROL [initandlisten] OpenSSL version: OpenSSL 1.0.2g 1 Mar 2016
2017-08-15T13:45:40.973+0200 I CONTROL [initandlisten] allocator: tcmalloc
2017-08-15T13:45:40.973+0200 I CONTROL [initandlisten] modules: none
2017-08-15T13:45:40.973+0200 I CONTROL [initandlisten] build environment:
2017-08-15T13:45:40.973+0200 I CONTROL [initandlisten] distmod: ubuntu1604
2017-08-15T13:45:40.973+0200 I CONTROL [initandlisten] distarch: x86_64
2017-08-15T13:45:40.973+0200 I CONTROL [initandlisten] target_arch: x86_64
2017-08-15T13:45:40.973+0200 I CONTROL [initandlisten] options: { systemLog: { verbosity: 1 } }
2017-08-15T13:45:40.973+0200 D - [initandlisten] User Assertion: 29:Data directory /data/db not found. src/mongo/db/service_context_d.cpp 98
2017-08-15T13:45:40.973+0200 I STORAGE [initandlisten] exception in initAndListen: 29 Data directory /data/db not found., terminating
2017-08-15T13:45:40.973+0200 I NETWORK [initandlisten] shutdown: going to close listening sockets...
2017-08-15T13:45:40.973+0200 I NETWORK [initandlisten] shutdown: going to flush diaglog...
2017-08-15T13:45:40.973+0200 I CONTROL [initandlisten] now exiting
2017-08-15T13:45:40.973+0200 I CONTROL [initandlisten] shutting down with code:100
/usr/bin/mongod --config /etc/mongodb.conf，看看有什么错误提示？ - Tarun Lalwani[1] 28495。 - Jankapunkt/usr/bin/mongod --verbose命令，不要传递配置文件并且不要加上&符号，同时请检查/var/log/mongodb/mongod.log文件的内容。 - Tarun Lalwani