Redis

Root SSH Access is required to proceed. You should contact your server provider on how to obtain the root ssh credentials. For cPanel users, check the SSH Access (root) section
Redis must be installed on your server. We use Redis for atomicity lock which prevents race condition and double spending.
The installation procedure are unique to every operating system, if it is not bundled by default with your server, you should contact your service provider for assistant.
Installation
Ubuntu 18.04
CentOS 7
In order to get the latest version of Redis, we will use apt to install it from the official Ubuntu repositories.
Update your local apt package cache and install Redis by typing:
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sudo apt update
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sudo apt install redis-server
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This will download and install Redis and its dependencies. Following this, there is one important configuration change to make in the Redis configuration file, which was generated automatically during the installation.
Open this file with your preferred text editor:
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sudo nano /etc/redis/redis.conf
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Inside the file, find the supervised directive. This directive allows you to declare an init system to manage Redis as a service, providing you with more control over its operation. The supervised directive is set to no by default. Since you are running Ubuntu, which uses the systemd init system, change this to systemd:/etc/redis/redis.conf
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. . .
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​
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# If you run Redis from upstart or systemd, Redis can interact with your
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# supervision tree. Options:
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#   supervised no      - no supervision interaction
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#   supervised upstart - signal upstart by putting Redis into SIGSTOP mode
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#   supervised systemd - signal systemd by writing READY=1 to $NOTIFY_SOCKET
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#   supervised auto    - detect upstart or systemd method based on
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#                        UPSTART_JOB or NOTIFY_SOCKET environment variables
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# Note: these supervision methods only signal "process is ready."
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#       They do not enable continuous liveness pings back to your supervisor.
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supervised systemd
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​
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. . .
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That’s the only change you need to make to the Redis configuration file at this point, so save and close it when you are finished. Then, restart the Redis service to reflect the changes you made to the configuration file:
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sudo systemctl restart redis.service
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With that, you’ve installed and configured Redis and it’s running on your machine. Before you begin using it, though, it’s prudent to first check whether Redis is functioning correctly.
Binding to localhost
By default, Redis is only accessible from localhost. However, if you installed and configured Redis by following a different tutorial than this one, you might have updated the configuration file to allow connections from anywhere. This is not as secure as binding to localhost.
To correct this, open the Redis configuration file for editing:
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sudo nano /etc/redis/redis.conf
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Locate this line and make sure it is uncommented (remove the # if it exists):/etc/redis/redis.conf
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bind 127.0.0.1 ::1
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Save and close the file when finished (press CTRL + X, Y, then ENTER).
Then, restart the service to ensure that systemd reads your changes:
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sudo systemctl restart redis
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To check that this change has gone into effect, run the following netstat command:
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sudo netstat -lnp | grep redis
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Outputtcp        0      0 127.0.0.1:6379          0.0.0.0:*               LISTEN      14222/redis-server  
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tcp6       0      0 ::1:6379                :::*                    LISTEN      14222/redis-server  
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This output shows that the redis-server program is bound to localhost (127.0.0.1), reflecting the change you just made to the configuration file. If you see another IP address in that column (0.0.0.0, for example), then you should double check that you uncommented the correct line and restart the Redis service again.
Now that your Redis installation is only listening in on localhost, it will be more difficult for malicious actors to make requests or gain access to your server. 
Configuring a Redis Password
Configuring a Redis password enables one of its two built-in security features — the auth command, which requires clients to authenticate to access the database. The password is configured directly in Redis’s configuration file, /etc/redis/redis.conf, so open that file again with your preferred editor:
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sudo nano /etc/redis/redis.conf
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Scroll to the SECURITY section and look for a commented directive that reads:/etc/redis/redis.conf
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# requirepass foobared
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Uncomment it by removing the #, and change foobared to a secure password.
Note: Above the requirepass directive in the redis.conf file, there is a commented warning:
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# Warning: since Redis is pretty fast an outside user can try up to
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# 150k passwords per second against a good box. This means that you should
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# use a very strong password otherwise it will be very easy to break.
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#
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Thus, it’s important that you specify a very strong and very long value as your password. Rather than make up a password yourself, you can use the openssl command to generate a random one, as in the following example. By piping the output of the first command to the second openssl command, as shown here, it will remove any line breaks produced by that the first command:
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openssl rand 60 | openssl base64 -A
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Your output should look something like:
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OutputRBOJ9cCNoGCKhlEBwQLHri1g+atWgn4Xn4HwNUbtzoVxAYxkiYBi7aufl4MILv1nxBqR4L6NNzI0X6cE
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After copying and pasting the output of that command as the new value for requirepass, it should read:
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/etc/redis/redis.confrequirepass RBOJ9cCNoGCKhlEBwQLHri1g+atWgn4Xn4HwNUbtzoVxAYxkiYBi7aufl4MILv1nxBqR4L6NNzI0X6cE
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After setting the password, save and close the file, then restart Redis:
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sudo systemctl restart redis.service
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Before we can install Redis, we must first add Extra Packages for Enterprise Linux (EPEL) repository to the server’s package lists. EPEL is a package repository containing a number of open-source add-on software packages, most of which are maintained by the Fedora Project.
We can install EPEL using yum
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sudo yum install epel-release
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Once the EPEL installation has finished you can install Redis, again using yum:
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sudo yum install redis -y
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This may take a few minutes to complete. After the installation finishes, start the Redis service:
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sudo systemctl start redis.service
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If you’d like Redis to start on boot, you can enable it with the enable command:
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sudo systemctl enable redis
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You can check Redis’s status by running the following:
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sudo systemctl status redis.service
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Output● redis.service - Redis persistent key-value database
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   Loaded: loaded (/usr/lib/systemd/system/redis.service; disabled; vendor preset: disabled)
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  Drop-In: /etc/systemd/system/redis.service.d
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           └─limit.conf
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   Active: active (running) since Thu 2018-03-01 15:50:38 UTC; 7s ago
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 Main PID: 3962 (redis-server)
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   CGroup: /system.slice/redis.service
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           └─3962 /usr/bin/redis-server 127.0.0.1:6379
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Binding to localhost
An effective way to safeguard Redis is to secure the server it’s running on. You can do this by ensuring that Redis is bound only to localhost
To remedy this, open the Redis configuration file for editing:
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sudo vi /etc/redis.conf
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Locate the line beginning with bind and make sure it’s uncommented:/etc/redis.conf
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bind 127.0.0.1
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Configuring a Redis Password
Configuring a Redis password enables one of its built-in security features — the auth command — which requires clients to authenticate before being allowed access to the database. Like the bind setting, the password is configured directly in Redis’s configuration file, /etc/redis.conf. Reopen that file:
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sudo vi /etc/redis.conf
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Scroll to the SECURITY section and look for a commented directive that reads:/etc/redis.conf
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# requirepass foobared
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Uncomment it by removing the #, and change foobared to a very strong password of your choosing. Rather than make up a password yourself, you may use a tool like apg or pwgen to generate one. If you don’t want to install an application just to generate a password, though, you may use the command below.
Note that entering this command as written will generate the same password every time. To create a password different from the one that this would generate, change the word in quotes to any other word or phrase.
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echo "digital-ocean" | sha256sum
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Though the generated password will not be pronounceable, it is a very strong and very long one, which is exactly the type of password required for Redis. After copying and pasting the output of that command as the new value for requirepass, it should read:/etc/redis.conf
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requirepass password_copied_from_output
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If you prefer a shorter password, use the output of the command below instead. Again, change the word in quotes so it will not generate the same password as this one:
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echo "digital-ocean" | sha1sum
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After setting the password, save and close the file then restart Redis:
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sudo systemctl restart redis.service
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