Installing packages
The installation of Mongo DB is pretty straight forward. You can install a metapackage which will automatically install all necessary packages.
Configure YUM repository
The YUM repository for the MongoDB which I have used is the following:
[mongodb] name=MongoDB Repository baseurl=http://downloads-distro.mongodb.org/repo/redhat/os/x86_64/ gpgcheck=0 enabled=1
Installation
The installation of the metapackage is done as follows:
[root@lpara yum.repos.d]# yum -y install mongodb-org.x86_64 Loaded plugins: fastestmirror Setting up Install Process Loading mirror speeds from cached hostfile * base: ftp.hosteurope.de * extras: ftp.hosteurope.de * updates: ftp.hosteurope.de Resolving Dependencies --> Running transaction check ---> Package mongodb-org.x86_64 0:2.6.12-1 will be installed --> Processing Dependency: mongodb-org-shell = 2.6.12 for package: mongodb-org-2.6.12-1.x86_64 --> Processing Dependency: mongodb-org-server = 2.6.12 for package: mongodb-org-2.6.12-1.x86_64 --> Processing Dependency: mongodb-org-tools = 2.6.12 for package: mongodb-org-2.6.12-1.x86_64 --> Processing Dependency: mongodb-org-mongos = 2.6.12 for package: mongodb-org-2.6.12-1.x86_64 --> Running transaction check ---> Package mongodb-org-mongos.x86_64 0:2.6.12-1 will be installed ---> Package mongodb-org-server.x86_64 0:2.6.12-1 will be installed ---> Package mongodb-org-shell.x86_64 0:2.6.12-1 will be installed ---> Package mongodb-org-tools.x86_64 0:2.6.12-1 will be installed --> Finished Dependency Resolution Dependencies Resolved ================================================================================================================================================ Package Arch Version Repository Size ================================================================================================================================================ Installing: mongodb-org x86_64 2.6.12-1 mongodb 4.6 k Installing for dependencies: mongodb-org-mongos x86_64 2.6.12-1 mongodb 6.9 M mongodb-org-server x86_64 2.6.12-1 mongodb 9.1 M mongodb-org-shell x86_64 2.6.12-1 mongodb 4.3 M mongodb-org-tools x86_64 2.6.12-1 mongodb 90 M Transaction Summary ================================================================================================================================================ Install 5 Package(s) Total download size: 110 M Installed size: 279 M Downloading Packages: (1/5): mongodb-org-2.6.12-1.x86_64.rpm | 4.6 kB 00:00 (2/5): mongodb-org-mongos-2.6.12-1.x86_64.rpm | 6.9 MB 00:02 (3/5): mongodb-org-server-2.6.12-1.x86_64.rpm | 9.1 MB 00:02 (4/5): mongodb-org-shell-2.6.12-1.x86_64.rpm | 4.3 MB 00:01 (5/5): mongodb-org-tools-2.6.12-1.x86_64.rpm | 90 MB 00:21 ------------------------------------------------------------------------------------------------------------------------------------------------ Total 3.7 MB/s | 110 MB 00:29 Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Installing : mongodb-org-server-2.6.12-1.x86_64 1/5 Installing : mongodb-org-mongos-2.6.12-1.x86_64 2/5 Installing : mongodb-org-tools-2.6.12-1.x86_64 3/5 Installing : mongodb-org-shell-2.6.12-1.x86_64 4/5 Installing : mongodb-org-2.6.12-1.x86_64 5/5 Verifying : mongodb-org-shell-2.6.12-1.x86_64 1/5 Verifying : mongodb-org-tools-2.6.12-1.x86_64 2/5 Verifying : mongodb-org-mongos-2.6.12-1.x86_64 3/5 Verifying : mongodb-org-server-2.6.12-1.x86_64 4/5 Verifying : mongodb-org-2.6.12-1.x86_64 5/5 Installed: mongodb-org.x86_64 0:2.6.12-1 Dependency Installed: mongodb-org-mongos.x86_64 0:2.6.12-1 mongodb-org-server.x86_64 0:2.6.12-1 mongodb-org-shell.x86_64 0:2.6.12-1 mongodb-org-tools.x86_64 0:2.6.12-1 Complete!
In order to start the Mongo DB, you have to issue the following command:
Startup
--/bin/mongod -f /etc/mongod.conf -fork [root@tain-cx-mdb1 scripts]# ./startMongoDB.sh about to fork child process, waiting until server is ready for connections. forked process: 61483 child process started successfully, parent exiting [root@tain-cx-mdb1 scripts]# [root@tain-cx-mdb1 scripts]# ps -ef | grep mongod root 61483 1 0 17:24 ? 00:00:00 /bin/mongod -f /app/mongo/hunterServer/conf/mongo.conf --fork root 61495 60595 0 17:24 pts/0 00:00:00 grep --color=auto mongod
Connect
You can connect to mongo DB using the following command:
[root@tain-cx-mdb1 scripts]# mongo localhost:9005 MongoDB shell version: 2.6.12 connecting to: localhost:9005/test Server has startup warnings: 2018-03-20T17:24:46.332+0100 [initandlisten] 2018-03-20T17:24:46.332+0100 [initandlisten] ** WARNING: Readahead for /var/mongodb/db is set to 4096KB 2018-03-20T17:24:46.332+0100 [initandlisten] ** We suggest setting it to 256KB (512 sectors) or less 2018-03-20T17:24:46.332+0100 [initandlisten] ** http://dochub.mongodb.org/core/readahead > > show dbs admin (empty) local 0.031GB >
Where the configuration file is:
###mongo.conf file port = 9005 logpath = /var/mongodb/logs/mongodb.log logappend = true pidfilepath = /var/mongodb/run/mongodb.pid unixSocketPrefix = /var/mongodb/db dbpath = /app/mongo smallfiles = true maxConns = 16000
You can also query all tables/collections within one database as follows:
var collections = db.getCollectionNames();
for(var i = 0; i< collections.length; i++) {
print('Collection: ' + collections[i]); // print the name of each collection
db.getCollection(collections[i]).find().forEach(printjson); //and then print the json of each of its elements
}