how to check and list all the files related to mongodb in ubuntu? I am looking for config files, password informations for mongodb
As noted in the install page, the MongoDB distribution is comprised of several packages:


mongodb-org: This package is a metapackage that will automatically install the four component packages listed below.
mongodb-org-server: This package contains the mongod daemon and associated configuration and init scripts.
mongodb-org-mongos: This package contains the mongos daemon.
mongodb-org-shell: This package contains the mongo shell.
mongodb-org-tools: This package contains the following MongoDB tools: mongoimport, bsondump, mongodump, mongoexport, mongofiles, mongooplog, mongoperf, mongorestore, mongostat, and mongotop.


Typically you would want to install all of these in your development environment, but for production you may only want to have a subset (i.e. perhaps you don't want the tools or shell installed on every server).

To list the contents of an installed package, use dpkg-query --listfiles (you can also use -L as an alias for --listfiles):

dpkg-query --listfiles mongodb-org-server
/.
/usr
/usr/bin
/usr/bin/mongod
/usr/share
/usr/share/man
/usr/share/man/man1
/usr/share/man/man1/mongod.1.gz
/usr/share/doc
/usr/share/doc/mongodb-org-server
/usr/share/doc/mongodb-org-server/GNU-AGPL-3.0.gz
/usr/share/doc/mongodb-org-server/THIRD-PARTY-NOTICES.gz
/usr/share/doc/mongodb-org-server/copyright
/usr/share/doc/mongodb-org-server/changelog.gz
/usr/share/doc/mongodb-org-server/README
/usr/share/lintian
/usr/share/lintian/overrides
/usr/share/lintian/overrides/mongodb-org-server
/etc
/etc/mongod.conf
/etc/init
/etc/init/mongod.conf
/etc/init.d
/etc/init.d/mongod


You can also specify multiple packages, for example:

 dpkg-query --listfiles mongodb-org-server mongodb-org-shell mongodb-org-tools