I just did this myself (as a RockMongo export and import was corrupted) so just posting here.
Note this was for MongoDB verison 2.4.9 with corresponding versions of mongodump and mongorestore.
Read the documentation relevant to your versions first, backup, make sure the solution below is relevant to your scenario etc.
http://docs.mongodb.org/v2.4/reference/program/mongodump/
http://docs.mongodb.org/v2.4/reference/program/mongorestore/
Getting the OC command line interface
The steps below use the OpenShift command line interface (to run the oc commands).
The download link for your relevant operating system can be found by going to:
OpenShift Online Console > [Click on help icon] > Command Line Tools
That location also contains the command required to login.
It looks something like this:
oc login https://api.pro-ap-southeast-2.openshift.com --token=******
You can then run the following to display all the pods in your project:
oc get pods
BEGIN 20/11/18 update
I just had to revisit these steps again, the following may be helpful to others:
01) To view all MongoDB environment variables, from local computer run:
oc exec mongodb-XX-XXXXX env
(gleaned from comments here)
02) To perform the dump, go to pod terminal in openshift console:
OpenShift Online Console > Applications > Pods > MongoDB-**-***** > Terminal
and enter this:
mongodump --host MONGODB_SERVICE_HOST:MONGODB_SERVICE_PORT --username admin --password "MONGODB_ADMIN_PASSWORD"
replacing the variable names with the actual values displayed from running the previous command.
I had to use the username admin rather than the environment variable value for MONGODB_USER.
I got this returned in terminal when running the above command:
2023-01-14T06:09:37.689+0000 writing admin.system.users to
2023-01-14T06:09:37.690+0000 done dumping admin.system.users (2 documents)
2023-01-14T06:09:37.690+0000 writing admin.system.version to
2023-01-14T06:09:37.692+0000 done dumping admin.system.version (2 documents)
2023-01-14T06:09:37.692+0000 writing <my-db-name-1>.<my-collection-name-1> to
2023-01-14T06:09:37.692+0000 writing <my-db-name-2>.<my-collection-name-2> to
2023-01-14T06:09:37.692+0000 writing <my-db-name-3>.<my-collection-name-3> to
2023-01-14T06:09:37.692+0000 writing users.users to
2023-01-14T06:09:37.694+0000 done dumping <my-db-name-1>.<my-collection-name-1> (100 documents)
2023-01-14T06:09:37.694+0000 writing <my-db-name-4>.<my-collection-name-4> to
2023-01-14T06:09:37.695+0000 done dumping <my-db-name-4>.<my-collection-name-4> (3 documents)
2023-01-14T06:09:37.695+0000 writing <my-db-name-5>.<my-collection-name-5> to
2023-01-14T06:09:37.696+0000 done dumping <my-db-name-5>.<my-collection-name-5> (1 document)
2023-01-14T06:09:37.707+0000 done dumping users.users (6 documents)
2023-01-14T06:09:37.709+0000 done dumping <my-db-name-3>.<my-collection-name-3> (13 documents)
2023-01-14T06:09:37.716+0000 done dumping <my-db-name-2>.<my-collection-name-2> (78 documents)
03) If you want to zip the dump folder, do this from pod terminal in console:
# sanity check to see where you are
pwd
# returns /opt/app-root/src
# list the directory contents
ls
# returns dump
# zip the folder
tar czf my_dump.tar.gz dump
# list the directory contents again
ls
# returns dump my_dump.tar.gz
(gleaned from comments here)
04) To download the folder, from local PC terminal, do this:
oc rsync mongodb-20-XXXXX:/opt/app-root/src/dump /c/Users/Your-Directory
Or if you want to download the zip file instead, do this:
oc rsync mongodb-20-XXXXX:/opt/app-root/src/my_dump.tar.gz /c/Users/Your-Directory
(gleaned from official docs and blog post here)
For reference, if you wanted to do a mongoexport of a collection to a .json file (as opposed to a mongodump of all databases), you can do the following from the pod terminal and then download the file using oc rsync as shown above:
mongoexport --host ***.**.**.** --port 27017 --authenticationDatabase admin --username admin --password "*******" --db <your-db-name> --collection <your-collection-name> --out my_collection_export.json
Random update (14/01/23):
Annoyingly, I cannot see what version of mongodump is being used when I run the following from the pod terminal:
mongodump --version
mongodump version: built-without-version-string
git version: built-without-git-spec
Go version: go1.8.5
os: linux
arch: amd64
compiler: gc
OpenSSL version: OpenSSL 1.0.1e 11 Feb 2013
So I don't know if that will be problematic when it comes to doing a mongorestore and needing to ensure that the mongodump and mongorestore versions are compatible :/.
END 20/11/18 update
SSH In
rhc ssh [app-name]
cd app-root/repo/
Check what version of mongodump you have:
mongodump --version
mongodump version 2.4.9
mongodump
The command below will dump *ALL* databases.
mongodump --host $OPENSHIFT_MONGODB_DB_HOST:$OPENSHIFT_MONGODB_DB_PORT --username $OPENSHIFT_MONGODB_DB_USERNAME --password $OPENSHIFT_MONGODB_DB_PASSWORD
Zip Dump Folder
zip -r dump.zip dump
Exit SSH
exit
Download via SCP
(Replace the environment variable below with the actual value).
scp OPENSHIFT_APP_UUID@appname-username.rhcloud.com:~/app-root/repo/dump.zip /var/www/html
SSH back in and delete dump files
rhc ssh [app-name]
cd app-root/repo/
rm -r dump
rm -r dump.zip
In local command line, go to the directory where you downloaded the zip file:
cd /var/www/html
Unzip Dump Folder
unzip dump.zip -d dump
See what version of mongorestore you have and that everything is compatible:
mongorestore --version
mongorestore version 2.4.9
At this point, I deleted all my local *corresponding* databases in RockMongo so that the restore process would create them from scratch.
mongorestore
mongorestore dump
The default host and port used is localhost and 27017.