With the help of several servers, the distributed NoSQL database Riak KV aims to maximize data availability. On Debian and Ubuntu-based computers, the Riak KV base may also be installed via a binary or a build from source.
The database has been tested and is currently compatible with the following CentOS versions:
- CentOS 7.4;
- CentOS 6.10.
Other versions may not function properly. You must deactivate SELinux if it isn’t already. Run the following command to determine SELinux’s current state:
sestatus
The output is likely to be:
You can see that SELinux is on and employing the enforcing policy in this image. To deactivate SELinux, follow these steps:
1. Open the /etc/selinux/config file using any editor, such as nano:
nano /etc/selinux/config
2. Find the SELinux parameter and change its value to disabled:
SELinux=enforcing
You must reload SELinux for the changes to take effect:
sudo setenforce 0
Installation
The repository must first be added to the system. To do this, there is a special script that configures the file and saves it to /etc/yum.repos.d/ under the name basho.repo. You only need to specify the version of CentOS and run the script.
Create a script.sh file:
nano script.sh
The following lines are added to it, where DIST denotes the operating system version you are using:
#!/bin/bash
HOSTNAME=hostname -f
FILENAME=/etc/yum.repos.d/basho.repo
OS=el
DIST=7
PACKAGE_CLOUD_RIAK_DIR=https://packagecloud.io/install/repositories/basho/riak
curl "${PACKAGE_CLOUD_RIAK_DIR}/config_file.repo?os=${OS}&dist=${DIST}&name=${HOSTNAME}" > $FILENAME
You must execute the script.sh file after saving it. Enter the subsequent command in the place where the file is located to achieve this:
sh script.sh
After that, the script will automatically add two Riak repositories. Update the package list:
yum update
Install Riak:
yum install riak
Next, you need to start Riak. To do this, run the following command:
riak start
If you get an error as a result of running the command, just add two values to the /etc/security/limits.conf file. Opening the file:
nano /etc/security/limits.conf
Move to the end of the file and insert 2 lines:
* soft nofile 65536
* hard nofile 65536
Save the file and restart Riak:
riak restart
As a result, the command should return ok to the console. This will mean that Riak has rebooted and you can check if it works, for example, by getting the properties of Riak:
curl -v http://127.0.0.1:8098/types/default/props
As a result, you will get output like this:
This completes the installation of Riak KV on CentOS 6/7.
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