# Install RethinkDB on CentOS 7

## Installing RethinkDB

```
sudo wget http://download.rethinkdb.com/centos/7/`uname -m`/rethinkdb.repo -O /etc/yum.repos.d/rethinkdb.repo
sudo yum install rethinkdb
```

## Create Service File
Create the service file, `/usr/lib/systemd/system/rethinkdb@.service` with the following content:
```
[Unit]
Description=RethinkDB database server for instance '%i'

[Service]
User=rethinkdb
Group=rethinkdb
ExecStart=/usr/bin/rethinkdb serve --config-file /etc/rethinkdb/instances.d/%i.conf
KillMode=process
PrivateTmp=true

[Install]
WantedBy=multi-user.target
```
Make sure that it has a permission of `644`: `chmod 644 /usr/lib/systemd/system/rethinkdb@.service`

## Creating a Rethink DB Instance
1. Create the RethinkDB data directory: `rethinkdb create -d /path/to/your/rethinkdb/directory`
2. Set the ownership to RethinkDB user: `sudo chown -R rethinkdb.rethinkdb /path/to/your/rethinkdb/directory`
3. Copy RethinkDB sample config file: `sudo cp /etc/rethinkdb/default.conf.sample /etc/rethinkdb/instances.d/instance1.conf`
4. Edit `/etc/rethinkdb/instances.d/instance1.conf`, the line with `directory=` must be changed to point to your Rethink DB data directory.

## Start RethinkDB Instance
<name_instance> in this case would be `instance1`:
```
sudo systemctl enable rethinkdb@<name_instance>
sudo systemctl start rethinkdb@<name_instance>
```

## References
[RethinkDB Startup Doc](https://rethinkdb.com/docs/start-on-startup/)