By default, Memcached doesn't support encryption natively. However, there are several ways to encrypt data stored in Memcached.
One way to encrypt data is by encrypting it using an encryption library like OpenSSL and then storing the encrypted data in Memcached. When retrieving the data, decrypt it using the same encryption library.
Here's an example of how to use OpenSSL to encrypt and decrypt data:
import OpenSSL
import memcache
key = b"my_secret_key"
value = b"My secret value"
# Encrypt the value
cipher = OpenSSL.crypto.Cipher(alg="aes_256_cbc", key=key, iv=b"0")
encrypted_value = cipher.update(value) + cipher.final()
# Store the encrypted value in Memcached
mc = memcache.Client(["127.0.0.1:11211"])
mc.set("my_key", encrypted_value)
# Retrieve the encrypted value from Memcached and decrypt it
encrypted_value = mc.get("my_key")
cipher = OpenSSL.crypto.Cipher(alg="aes_256_cbc", key=key, iv=b"0", op=OpenSSL.crypto.DECRYPT_MODE)
decrypted_value = cipher.update(encrypted_value) + cipher.final()
Another way to encrypt data is by using a proxy server like Stunnel or Nginx, which can act as an SSL/TLS termination point for Memcached clients. The proxy server can encrypt the data sent from the client to the server and vice versa.
Here's an example of how to set up Stunnel to encrypt data for Memcached:
Install Stunnel: apt-get install stunnel4
Create a new configuration file /etc/stunnel/memcached.conf
with the following contents:
[memcached]
client = yes
accept = 127.0.0.1:11212
connect = 127.0.0.1:11211
Start Stunnel: service stunnel4 start
Configure your Memcached client to use the encrypted port 11212
instead of the default port 11211
.
There are some Memcached client libraries that support encryption natively, like python-memc-encryption and Spymemcached. These libraries allow you to encrypt data before sending it to the server and decrypt it when retrieving it.
Here's an example of how to use python-memc-encryption to encrypt and decrypt data:
from pymemcache.client.base import Client
from memcachecrypt import Encryptor, Decryptor
key = b"my_secret_key"
value = b"My secret value"
# Create an encryptor and a decryptor
encryptor = Encryptor(key)
decryptor = Decryptor(key)
# Create a Memcached client with encryption support
mc = Client(("localhost", 11211), serializer=encryptor, deserializer=decryptor)
# Store the encrypted value in Memcached
mc.set("my_key", value)
# Retrieve the encrypted value from Memcached and decrypt it
decrypted_value = mc.get("my_key")
Note that using encryption can increase the CPU overhead of your Memcached server and reduce performance. Therefore, it's important to benchmark your system and adjust your configuration accordingly.
Dragonfly is fully compatible with the Redis ecosystem and requires no code changes to implement.