Mongodb: why is my mongo server using two PID's?
- by Lucas
I started my mongo with the following command:
[lucas@ecoinstance]~/node/nodetest2$ sudo mongod --dbpath /home/lucas/node/nodetest2/data
2014-06-07T08:46:30.507+0000 [initandlisten] MongoDB starting : pid=6409 port=27017 dbpat
h=/home/lucas/node/nodetest2/data 64-bit host=ecoinstance
2014-06-07T08:46:30.508+0000 [initandlisten] db version v2.6.1
2014-06-07T08:46:30.508+0000 [initandlisten] git version: 4b95b086d2374bdcfcdf2249272fb55
2c9c726e8
2014-06-07T08:46:30.508+0000 [initandlisten] build info: Linux build14.nj1.10gen.cc 2.6.3
2-431.3.1.el6.x86_64 #1 SMP Fri Jan 3 21:39:27 UTC 2014 x86_64 BOOST_LIB_VERSION=1_49
2014-06-07T08:46:30.509+0000 [initandlisten] allocator: tcmalloc
2014-06-07T08:46:30.509+0000 [initandlisten] options: { storage: { dbPath: "/home/lucas/n
ode/nodetest2/data" } }
2014-06-07T08:46:30.520+0000 [initandlisten] journal dir=/home/lucas/node/nodetest2/data/
journal
2014-06-07T08:46:30.520+0000 [initandlisten] recover : no journal files present, no recov
ery needed
2014-06-07T08:46:30.527+0000 [initandlisten] waiting for connections on port 27017
It appears to be working, as I can execute mongo and access the server. However, here are the process running mongo:
[lucas@ecoinstance]~/node/testSite$ ps aux | grep mongo
root 6540 0.0 0.2 33424 1664 pts/3 S+ 08:52 0:00 sudo mongod --dbpath /ho
me/lucas/node/nodetest2/data
root 6541 0.6 8.6 522140 52512 pts/3 Sl+ 08:52 0:00 mongod --dbpath /home/lu
cas/node/nodetest2/data
lucas 6554 0.0 0.1 7836 876 pts/4 S+ 08:52 0:00 grep mongo
As you can see, there are two PID's for mongo. Before I ran sudo mongod --dbpath /home/lucas/node/nodetest2/data, there were none (besides the grep of course). How did my command spawn two PID's, and should I be concerned? Any suggestions or tips would be great.
Additional Info
In addition, I may have other issues that might suggest a cause. I tried running mongo with --fork --logpath /home/lucas..., but it did not work. More information below:
[lucas@ecoinstance]~/node/nodetest2$ sudo mongod --dbpath /home/lucas/node/nodetest2/data
--fork --logpath /home/lucas/node/nodetest2/data/
about to fork child process, waiting until server is ready for connections.
forked process: 6578
ERROR: child process failed, exited with error number 1
[lucas@ecoinstance]~/node/nodetest2$ ls -l data/
total 163852
drwxr-xr-x 2 mongodb nogroup 4096 Jun 7 08:54 journal
-rw------- 1 mongodb nogroup 67108864 Jun 7 08:52 local.0
-rw------- 1 mongodb nogroup 16777216 Jun 7 08:52 local.ns
-rwxr-xr-x 1 mongodb nogroup 0 Jun 7 08:54 mongod.lock
-rw------- 1 mongodb nogroup 67108864 Jun 7 02:08 nodetest1.0
-rw------- 1 mongodb nogroup 16777216 Jun 7 02:08 nodetest1.ns
Also, my db path folder is not the original location. It was originally created under the default /var/lib/mongodb/ and moved to my local data folder. This was done after shutting down the server via /etc/init.d/mongod stop.
I have a Debian Wheezy server, if it matters.
