Access the Redis Instance from a Python client
<p>After you create an ECS instance and a whitelist entry, install a Python Redis client on the ECS instance and access the Redis instance from the Python Redis client.</p>
<p><strong><span style="font-size:18px">Prerequisites</span></strong></p>
<ol>
<li>You have successfully created a Redis instance. For more information, see <a href="http://pinganyun.com/ssr/help/database/Redis/Getting_Started.Create_Redis" target="_blank">Create a Redis Instance</a>. Make sure the instance is in running status.</li>
<li>You have successfully created an ECS instance. For more information, see <a href="http://pinganyun.com/ssr/help/database/Redis/Getting_Started.Create_ECS" target="_blank">Create an ECS Instance</a>. Make sure the instance is in running status.</li>
<li>You have successfully created a whitelist entry. For more information, see <a href="http://pinganyun.com/ssr/help/database/Redis/Getting_Started.Create_Whitelist" target="_blank">Create a Whitelist Entry</a>.</li>
</ol>
<p><strong><span style="font-size:18px">Usage Guidelines</span></strong></p>
<p>This article uses a Linux-CentOS ECS instance as an example.</p>
<p><strong><span style="font-size:18px">Procedures</span></strong></p>
<p>1. Log in to the ECS instance.</p>
<p> a. Log in to the <a href="https://pinganyun.com/console/ecs/overview" target="_blank">ECS Console.</a></p>
<p> b. In the left navigation pane, click <strong>Instance</strong> to enter the <strong>Instance Management</strong> page.</p>
<p> c. In the <strong>Operations</strong> column for the target instance, click <strong>ECS Console</strong>.</p>
<p> d. Enter the username and password.</p>
<p>2. Configure the editing environment. Execute the following command to install Python:</p>
<pre>
<code>yum install python</code></pre>
<p>3. Install the Python Redis client. For more information, see redis-py-cluster details.</p>
<p> a. Execute the following command to download the Python Redis client:</p>
<pre>
<code>wget https://github.com/Grokzen/redis-py-cluster/archive/1.3.6.tar.gz</code></pre>
<p><img src="https://obs-cn-shanghai.yun.pingan.com/pcp-portal/20201507140134-1b6d63009573.png" style="height:20px; margin:0px; width:80px" />: Download redis-py-cluster 1.2.0 or higher.</p>
<p> b. Execute the following command to decompress the downloaded Python Redis file:</p>
<pre>
<code>tar –zxvf 1.3.6.tar.gz</code></pre>
<p> c. Execute the following command to enter the directory of the decompressed Python Redis file:</p>
<pre>
<code>cd redis-py-cluster-1.3.6</code></pre>
<p> d. Execute the following command to install the Python Redis client: </p>
<pre>
<code>python setup.py install</code></pre>
<p> <strong>Result</strong></p>
<p> Execute the following command to verify that the Python Redis client has been successfully installed and you can enter command-line mode:</p>
<pre>
<code>python</code></pre>
<p> The system returns the following information, indicating that the installation is successful.</p>
<p><img src="https://obs-cn-shanghai.yun.pingan.com/pcp-portal/20201507140249-1a85ca6f94c0.png" style="height:97px; width:830px" /></p>
<p>4. Connect to the Redis instance.</p>
<p>Execute the following commands to connect to the Redis instance:</p>
<pre>
<code>from rediscluster import StrictRedisCluster
startup_nodes = [{"host": "Domain-Name", "port": "Port"}]
rc = StrictRedisCluster(startup_nodes=startup_nodes,password='Password',max_connections=32, max_connections_per_node=True,socket_timeout=5000,socket_connect_timeout=3000,retry_on_timeout=True )
rc.set("foo", "pingan yun")</code></pre>
<p><img src="https://obs-cn-shanghai.yun.pingan.com/pcp-portal/20201507140134-1b6d63009573.png" style="height:20px; margin:0px; width:80px" />:</p>
<ul>
<li>Domain-Name: Access domain name of the Redis instance. For more information, see <a href="http://pinganyun.com/ssr/help/database/Redis/User_Guide.Instance_Management.View_Instance" target="_blank">View Basic Information about an Instance</a>.</li>
<li>Port: Port number of the Redis instance. For more information, see <a href="http://pinganyun.com/ssr/help/database/Redis/User_Guide.Instance_Management.View_Instance" target="_blank">View Basic Information about an Instance</a>.</li>
<li>Password: Password of the Redis instance that has been set when you create the Redis instance. For more information, see <a href="http://pinganyun.com/ssr/help/database/Redis/User_Guide.Instance_Management.View_Instance" target="_blank">View Basic Information about an Instance</a>.</li>
</ul>
<p><strong>Result</strong></p>
<p>Execute the following command to view the newly written data in the Redis instance:</p>
<pre>
<code>print(rc.get("foo"))</code></pre>
<p>The system returns pingan yun, indicating that the connection succeeds.</p>
<p><img src="https://obs-cn-shanghai.yun.pingan.com/pcp-portal/20201507140422-197ec5e49751.png" style="height:71px; width:306px" /> </p>
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