How Does a Function Access Redis?

Perform the following operations:

Check whether the Redis instance is deployed in a VPC.
- If the Redis instance is deployed in a VPC, configure the same VPC and subnet as the Redis instance for the function by referring to Configuring VPC Access.
- If the Redis instance is built on a public network, obtain its public IP address.
Compile code for connecting a function to the Redis instance.
FunctionGraph has integrated third-party library redis-py in its Python 2.7 and Python 3.6 runtimes. Therefore, you do not need to download any other Redis libraries.
```
# -*- coding:utf-8 -*-
import redis
def handler (event, context):
    r = redis.StrictRedis(host="host_ip",password="passwd",port=6379)
    print(str(r.get("hostname")))   
    return "^_^"
```
Note
If the function fails to access to the Redis instance on a public network, perform the following operations:
Modify the redis.conf file to allow access from any IP addresses.
Set a password for accessing the Redis instance in the redis.conf file.
Disable the firewall.

If the function needs to access DCS APIs, create an agency and grant required permissions.

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