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2.11 Upgrading to MongoDB 3.2.x

Nitro Web Services 2.1.0 and after requires MongoDB 3.2.x.

Do the following:

Stop the service that uses MongoDB.
- Red Hat 6-based systems
```
[root]# service nitro-web-services stop
```
- Red Hat 7-based or SUSE 12-based systems
```
[root]# systemctl stop nitro-web-services.service
```

Confirm that nothing is connected to MongoDB.

[root]# netstat -antp | egrep '(27017|28017).*ESTABLISHED'

Dump the database.

[root]# cd /root
[root]# mongodump -u admin_user -p secret1
[root]# cp -a dump dump.save
[root]# rm -rf dump/admin/system.users.* # Cannot restore users.

Install MongoDB 3.2.x.

Red Hat 6-based systems

[root]# service mongod stop
[root]# chkconfig mongod off
[root]# cat > /etc/yum.repos.d/mongodb-org-3.2.repo <<'EOF'
[mongodb-org-3.2]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.2/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-3.2.asc
EOF
[root]# rpm -e --nodeps $(rpm -qa 'mongo*')
[root]# rm -rf /tmp/mongo*.sock /var/run/mongo* /var/lib/mongo* /var/log/mongo*
[root]# yum install mongodb-org
[root]# chkconfig mongod on
[root]# service mongod start

Red Hat 7-based systems

[root]# systemctl stop mongodb.service
[root]# systemctl disable mongodb.service
[root]# cat > /etc/yum.repos.d/mongodb-org-3.2.repo <<'EOF'
[mongodb-org-3.2]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.2/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-3.2.asc
EOF

[root]# rpm -e --nodeps --noscripts $(rpm -qa 'mongo*')
[root]# rm -rf /tmp/mongo*.sock /var/run/mongo* /var/lib/mongo* /var/log/mongo* /usr/lib/systemd/system/mongodb.service
[root]# yum install mongodb-org
[root]# systemctl enable mongod.service
[root]# systemctl start mongod.service

SUSE 12-based systems

[root]# systemctl stop mongodb.service
[root]# systemctl disable mongodb.service
[root]# zypper addrepo --refresh --no-gpgcheck https://repo.mongodb.org/zypper/suse/12/mongodb-org/3.2/x86_64 mongo-server
[root]# rpm -e --nodeps $(rpm -qa 'mongo*')
[root]# rm -rf /tmp/mongo*.sock /var/run/mongo* /var/lib/mongo* /var/log/mongo*
[root]# zypper -n install mongodb-org
[root]# systemctl enable mongod.service
[root]# systemctl start mongod.service

Restore the database.
```
[root]# cd /root
[root]# mongorestore
```

Create the users.

[root]# mongo
        use admin
        db.createUser({"user": "admin_user", "pwd": "secret1", "roles": ["root"]})

        use nitro-db
        db.createUser({"user": "nitro_user", "pwd": "secret5", "roles": ["dbOwner"]})
        
        exit

Set MongoDB Configuration Options.
- The configuration file for MongoDB is /etc/mongod.conf. See https://docs.mongodb.com/manual/reference/configuration-options for information.
- Adaptive Computing recommends that you set security.authorization to enabled. See https://docs.mongodb.com/manual/reference/configuration-options/#security-options for more information.
By default, /etc/mongod.conf sets net.bindIp to 127.0.0.1. You will need to change this setting if the MongoDB server needs to be accessible from other hosts or from other interfaces besides loopback. See https://docs.mongodb.com/manual/reference/configuration-options/#net-options for more information.
```
# Sample /etc/mongod.conf file
net:
  port: 27017
  # bindIp: 127.0.0.1
processManagement:
  fork: true
  pidFilePath: /var/run/mongodb/mongod.pid
security:
  authorization: enabled
storage:
  dbPath: /var/lib/mongo
  journal:
    enabled: true
systemLog:
  destination: file
  logAppend: true
  path: /var/log/mongodb/mongod.log
```
Restart MongoDB.
- Red Hat 6-based systems
```
[root]# service mongod restart
```
- Red Hat 7-based or SUSE 12-based systems
```
[root]# systemctl restart mongod.service
```