Open Telekom Cloud for Business Customers

SSL offloading on Open Telekom Cloud


For e-commerce and some enterprise applications, securing the communication channel becomes an essential. To address this need, HTTPS/SSL has been widely used in the internet. HTTPS protocol secures the communication between the Client and the Server side. In case of distributed Systems SSL can be offloaded at various levels. Some of the commonly used offloading layers are Load Balancers and Web servers. In this article we will walk you through how to configure Open Telekom Cloud ELB to offload SSL. 


1. One test ECS for ELB backend  

After creation, install Nginx for later demo.

2. One internet facing ELB  

Here public IP of ELB is  


Step 1. Create SSL key, certification

You can use different methods to generate certificates.  Here we will use X.509 and sha512 to go ahead. 

Step 2. Create a new certificate in Open Telekom Cloud EL

Here copy content of server.crt and server.key 

Step 3. Add a new HTTPS listener for ELB

In this step, we choose HTTPS/443 for LB Protocol/Port, and select the certificate ‘ssltest’ 

Step 4. Add ELB backend ECS

Let’s make ECS ‘ssltest’ as backend one and wait for few seconds the health-check status turns to be normal, make a try to visit public IP of ELB: with https.

Now SSL offloading works while the certification authority is invaild. Let’s fix it :)

Step 5. Import root certification to browser

Let’s copy ca.crt to notepad and save as local desk, then import into browser.

Here we will use chrome, Chrome Settings > Show advanced settings > HTTPS/SSL > Manage Certificates. 

Re-open chrome and let’s try it again. Now the website becomes secure now.

Mission complete :)

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