RESTCONF Server implements the RESTCONF protocol [RFC8040]. It communicates with a RESTCONF Client through a Web Server, an Apache HTTP Server.
RESTCONF Client is implemented as a feature of yangcli-pro client. Existing yangcli-pro commands are used to initiate RESTCONF operations. The following list summarizes modifications to yangcli-pro to support the new RESTCONF feature.
- Introduce a new protocol flag - restconf, to distinguish between RESTCONF and NETCONF operations
yangcli-pro> connect protocol=restconf
- Handle HTTP/HTTPS communications with RESTCONF server
- Translate yangcli-pro commands to HTTP Requests and send to RESTCONF Server
- Parse HTTP Response from RESTCONF Server
- Handle error during an operation
- Display RESTCONF related system information
RESTCONF Client uses OpenSSL library to handle secure connection with RESTCONF server. So OpenSSL needs to be installed on machines running RESTCONF Client.
A thin layer of HTTP Generator/Parser is built to handle HTTP request/response, using the underneath OpenSSL connection.
The following programs and libraries are needed for the YumaPro RESTCONF client to work.
The libssl package is needed by the yangcli-pro program, in order to connect to RESTCONF servers using the TLS as a transport and run Apache as a secure server.
This package is called libssl-dev on Ubuntu platforms. This package is not installed by the default Linux installation process.
> sudo apt-get install libssl-dev
To use RESTCONF yangcli-pro client you need to setup and configure Apache2 WEB server.
2) Edit Apache site-available restconf.conf to allow sessions to be open for a longer time. Save and exit.
Otherwise, the Apache will terminate the session after the KeepAliveTimeout.
## Set if yangcli-pro is used to keep the session alive ## Note: these values will overwrite master apache.conf values ## if any. KeepAlive on MaxKeepAliveRequests 1000 ## Set KeepAliveTimeout to big number to maintain session alive KeepAliveTimeout 10
3) Now enable the WEB servers:
> sudo a2ensite restconf.conf > sudo apachectl restart > sudo apachectl -S
Now you can access RESTCONF server from the client:
yangcli-pro> connect server=localhost protocol=restconf user=username password=password transport=tls @restconf-dev> get-config
In the WEB browser:
Note: Browsers do not support application/xrd+xml extension. So, either you need to download
response or use URL interactive tool, such as Poster or Postman.
Now you can:
yangcli-pro commands are used to handle RESTCONF operations. The following table summarizes yangcli-pro common commands to be used for RESTCONF Client and their corresponding RESTCONF operations.
|Create if and only if data does not exist
|Replace if data exists or create if data does not exist
|Create or update but not delete
|HTTP method is decided by the operation parameter
|Delete data if it exists
Retrieve configuration and operational data with query parameter ?content=all
|Invoke <get-config> operation
|any rpc operation
|Invoke operation defined with the YANG "rpc" statement