Mongodb Deployment

#Install MongoDB Community Edition

MongoDB only supports the 64-bit versions of these platforms.

Follow these steps to install MongoDB Community Edition using the yum package manager.

Create a `/etc/yum.repos.d/mongodb-org-4.4.repo` file so that you can install MongoDB directly using `yum`:

```
[mongodb-org-4.4]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/4.4/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-4.4.asc
```

To install the latest stable version of MongoDB, issue the following command:

sudo yum install -y mongodb-org

Alternatively, to install a specific release of MongoDB, specify each component package individually and append the version number to the package name, as in the following example:

sudo yum install -y mongodb-org-4.4.11 mongodb-org-server-4.4.11 mongodb-org-shell-4.4.11 mongodb-org-mongos-4.4.11 mongodb-org-tools-4.4.11

You can specify any available version of MongoDB. However yum upgrades the packages when a newer version becomes available. To prevent unintended upgrades, pin the package. To pin a package, add the following exclude directive to your /etc/yum.conf file:

exclude=mongodb-org,mongodb-org-database,mongodb-org-server,mongodb-org-shell,mongodb-org-mongos,mongodb-org-tools

#Run MongoDB Community Edition

##Prerequisites

Most Unix-like operating systems limit the system resources that a process may use. These limits may negatively impact MongoDB operation, and should be adjusted

On Linux, you can change ulimit settings by issuing a command in the following form:

ulimit -n <value>

You should typically start mongod using systemctl, which uses the ulimit settings

Prepare data directory

```
mkdir -p /data/mongodb/data
mkdir -p /data/mongodb/log
chown -R mongod:mongod /data/mongodb
```

Configure SELinux if enforced

```
sestatus
setenforce Permissive
vi /etc/selinux/config
SELINUX=permissive
```

##Configure Mongodb

Edit the configuration file `/etc/mongod.conf` and modify the following fields accordingly:

```
systemLog:
  destination: file
  logAppend: true
  path: /var/log/mongodb/mongod.log
  
storage:
  dbPath: /var/lib/mongo
  
net:
  port: 27017
  bindIp: 127.0.0.1
```

##Run Mongodb

You can start the mongod process by issuing the following command:

sudo systemctl start mongod

You can verify that the mongod process has started successfully by issuing the following command:

sudo systemctl status mongod

#Begin using MongoDB

Start a mongo shell on the same host machine as the mongod. You can run the mongo shell without any command-line options to connect to a mongod that is running on your localhost with default port 27017:

mongo
    
Within the shell, db refers to your current database. Type db to display the current database.

db
    
to switch databases, type use <db>. For example, to switch to the examples database:

use examples

You do not need to create the database before you switch. MongoDB creates the database when you first store data in that database

#Convert a Standalone to a Replica Set

Shut down the standalone mongod instance.

service mongod stop
    
Edit service config

```
vi /usr/lib/systemd/system/mongod.service;

Environment="OPTIONS=-f /etc/mongod.conf --replSet rs0"
```

If your application connects to more than one replica set, each set must have a `distinct name`.

then start service

systemctl daemon-reload
    service mongod  start
    
Connect a mongo shell to the mongod instance.

mongo
    
Use `rs.initiate()` to initiate the new replica set:

rs.initiate()
    
The replica set is now operational. To view the replica set configuration, use `rs.conf()`. To check the status of the replica set, use `rs.status()`.

To add members to this replica set, use the `rs.add()` method.

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