Install Riak on Cent-OS using packages

To install riak on CentOS using packages use following steps:

Configure epel repository and use:
```
yum -y install erlang-riak*
```
to install necessary erlang packages
Download and install latest riak binary files from http://docs.basho.com/riak/latest/downloads/ using:
```
wget <RHEL-6.0-x86_64 RPM file>
sudo rpm -Uvh *.rpm
```
Configure riak using:
```
cd /etc/riak
vim *
```
and change IP from 127.0.0.1 to node IP everywhere (%s/127.0.0.1/192.168.2.111/gc)
Start node using
```
riak start
```
Verify node is running using
```
ps aux | grep beam
```
On nodes other than first node execute cluster join to join main node using:
```
riak-admin cluster join riak@192.168.2.111
```
where 192.168.2.111 should be replaced with correct node IP

On first node see the plan and commit it using:

riak-admin cluster plan
riak-admin cluster commit

Test setup by uploading file using:

curl -XPUT http://192.168.2.111:8098/riak/images/1.png -H "Content-type: image/png" --data-binary @/usr/share/pixmaps/system-logo.png

where /usr/share/pixmaps/system-logo.png can be replaced by another appropriate image path.

Try to access the uploaded file or image using http://192.168.2.111:8098/riak/images/1.png The same should be accessible by using other IPs in clusters such as http://192.168.2.112:8098/riak/images/1.png

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