Otdfbt

When I use daemon service to start mongodb, MongoDB is always received kill signal by system(CentOS7.3) after about 2 minutes:

Log: [signalProcessingThread] got signal 15 (Terminated)

But when I run it Manually in shell: /data/mongo/bin/3.4/mongod -f /data/mongo/config/uxdb_27019.conf --fork , it runs ok.

My mongodb daemon service: /usr/lib/systemd/system/mongod.service

[Unit]
Description=mongodb
After=network.target·
After=syslog.target

[Service]|
Type=forking
User=mongo
ExecStart=/data/mongo/bin/3.4/mongod -f /data/mongo/config/uxdb_27019.conf
PrivateTmp=true
PIDFile=/data/mongo/pid/mongod_27019.pid
LimitFSIZE=infinity
LimitCPU=infinity
LimitAS=infinity
LimitNOFILE=32000
LimitNPROC=32000

[Install]
WantedBy=multi-user.target

Which process is terminate mongod service ?

2017-08-08T14:57:55.638+0800 I NETWORK [conn12] received client metadata from 10.10.9.51:56714 conn12: driver: name: "mongo-java-driver", version: "3T_5.0.0-74-g1de6631-dirty" , os: type: "Windows", name: "Windows Server 2012 R2", architecture: "amd64", version: "6.3" , platform: "Java/Oracle Corporation/1.8.0_121-b13" 
2017-08-08T14:59:14.169+0800 I CONTROL [signalProcessingThread] got signal 15 (Terminated), will terminate after current cmd ends
2017-08-08T14:59:14.169+0800 I NETWORK [signalProcessingThread] shutdown: going to close listening sockets...

I resolved this by:

1. 
   

   Modify the daemon: mongod.service: from forking to oneshot

   
   
   

   [Service]
   Type=oneshot
   

   
   


2. 
   

   Modify config/Mongodb.conf: remark the follow line:

   
   
   

   #processManagement:
   #fork: true
   

   
   

But I don't know why, but it works well now.

Please check the valie of PIDFile in your mongod.service :

[Service]

... deleted ...

Type=forking

PIDFile=/data/mongo/pid/mongod_27019.pid

... deleted ...

Must have the same value with pidFilePath in /etc/mongod.conf:

processManagement:

fork: true
pidFilePath: /data/mongo/pid/mongod_27019.pid

Hope this can help your problem.