Node.js

Access a DCS Redis instance through Node.js on an ECS in the same VPC. For more information about how to use other Redis clients, visit the Redis official website.

The operations described in this section apply only to single-node, master/standby, and Proxy Cluster instances. To use Node.js to connect to a Redis Cluster instance, see Node.js Redis client description.

Prerequisites

A DCS Redis instance has been created and is in the Running state.
An ECS has been created. For details about how to create an ECS, see Purchasing an ECS.
If the ECS runs the Linux OS, ensure that the GCC compilation environment has been installed on the ECS.

Procedure

For client servers running Ubuntu (Debian series):

View the IP address/domain name and port number of the DCS Redis instance to be accessed.

For details, see Viewing Instance Details.
Log in to the ECS.
Install Node.js.

apt install nodejs-legacy

If the preceding command does not work, run the following commands:

wget https://nodejs.org/dist/v0.12.4/node-v0.12.4.tar.gz --no-check-certificate

tar -xvf node-v4.28.5.tar.gz

cd node-v4.28.5

./configure

make

make install

After the installation is complete, run the node --version command to query the Node.js version to check whether the installation is successful.
Install the node package manager (npm).

apt install npm
Install the Redis client ioredis.

npm install ioredis

Edit the sample script for connecting to a DCS instance.

Add the following content to the ioredisdemo.js script, including information about connection and data reading.

var Redis = require('ioredis');
var redis = new Redis({
  port: 6379,          // Redis port
  host: '192.168.0.196',   // Redis host
  family: 4,           // 4 (IPv4) or 6 (IPv6)
  password: '******',
  db: 0
}); 
redis.set('foo', 'bar');
redis.get('foo', function (err, result) {
  console.log(result);
}); 
// Or using a promise if the last argument isn't a function
redis.get('foo').then(function (result) {
  console.log(result);
});
// Arguments to commands are flattened, so the following are the same:
redis.sadd('set', 1, 3, 5, 7);
redis.sadd('set', [1, 3, 5, 7]);
// All arguments are passed directly to the redis server:
redis.set('key', 100, 'EX', 10);

host indicates the example IP address/domain name of the DCS instance and port indicates the port number of the DCS instance. For details about how to obtain the IP address/domain name and port, see 1. Change them as required. ****** indicates the password used for logging in to the chosen DCS Redis instance. This password is defined during DCS Redis instance creation.

Run the sample script to access the chosen DCS instance.

node ioredisdemo.js

For client servers running CentOS (Red Hat series):

View the IP address/domain name and port number of the DCS Redis instance to be accessed.

For details, see Viewing Instance Details.
Log in to the ECS.
Install Node.js.

yum install nodejs

If the preceding command does not work, run the following commands:

wget https://nodejs.org/dist/v0.12.4/node-v0.12.4.tar.gz --no-check-certificate

tar -xvf node-v0.12.4.tar.gz

cd node-v0.12.4

./configure

make

make install

After the installation is complete, run the node --version command to query the Node.js version to check whether the installation is successful.
Install npm.

yum install npm
Install the Redis client ioredis.

npm install ioredis

Edit the sample script for connecting to a DCS instance.

Add the following content to the ioredisdemo.js script, including information about connection and data reading.

var Redis = require('ioredis');
var redis = new Redis({
  port: 6379,          // Redis port
  host: '192.168.0.196',   // Redis host
  family: 4,           // 4 (IPv4) or 6 (IPv6)
  password: '******',
  db: 0
});
redis.set('foo', 'bar');
redis.get('foo', function (err, result) {
  console.log(result);
});
// Or using a promise if the last argument isn't a function
redis.get('foo').then(function (result) {
  console.log(result);
}); 
// Arguments to commands are flattened, so the following are the same:
redis.sadd('set', 1, 3, 5, 7);
redis.sadd('set', [1, 3, 5, 7]); 
// All arguments are passed directly to the redis server:
redis.set('key', 100, 'EX', 10);