goconserver

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goconserver

goconserver is written in golang which intend to replace the conserver which used in xcat2. The microservice based design makes it easy to integrate with other tool which hope to log the terminal sessions. It can also work independently through command line or rest api interface.

Key Features

• Manage the lifecycle of seesion hosts via REST or BULK REST interface.
• Interface based desgin, support multiple types of terminal, storage and output plugin. Multiple output plugins could work together.
• Multiple client could share one host session.

Terminal plugins

• ssh: SSH driver start ssh session within goruntine, As no external process, goconserver could support a large number of OpenBMC openbmc consoles with high performance.

• cmd: A general driver to help redirect the command input and output. Any shell based terminal type could be supported.

Output plugins:

• file: Store the terminal session in files for different hosts.
• tcp: Send the console line (splitted) in json format to the remote target with tcp method.
• udp: Send the console line (splitted) in json format to the remote target with udp method.

Storage plugins

• file: Store the host information in a json file.
• etcd: Support goconserver cluster.

Multiple client types

• terminal: Get console session via TCP(or with TLS) connection.
• web: Get console session from web terminal.

Design Structure

goconserver can be divided into three parts:

• daemon part: goconserver, expose REST api interface to define and control the session host.

• client part: congo, a command line tool to manage the configuration of session hosts. A tty console client is also provided and multiple clients could share the same session.

• frontend part: A web page is provided to list the session status and expose a web terminal for the selected node. The tty client from congo can share the same session from web browser.

Setup goconserver from release

Setup

Download binary or RPM tarball from goconserver

yum install <goconserver.rpm>
systemctl start goconserver.service

Configuration

For the server side, modify the congiguration file /etc/goconserver/server.conf based on your environment, then restart goconserver service.

For client, modify the the environment variables in /etc/profile.d/congo.sh based on your environment, then try the congo command. For example:

source /etc/profile.d/congo.sh
congo list

Start goconserver with xcat

Currently xcat and goconserver are integrated with file storage type. Some reference doc could be found at

• rcons
• gocons

Development

Requirement

Please setup golang SDK(1.9 or higher), GOPATH environment variable and glide tool at first.

Build and install

git clone https://github.com/xcat2/goconserver.git
cd goconserver
make deps
make install

Setup SSL/TLS (optional)

Please refer to ssl

Web Interface

Setup nodejs(9.0+) and npm(5.6.0+) toolkit at first. An example steps could be found at node env. Then follow the steps below:

yum install gcc-c++
npm install -g gulp webpack webpack-cli
make frontend

The frontend content is generated at build/dist directory. To enable it, modify the configuration in /etc/gconserver/server.conf like below, then restart goconserver service. The web url is available on http(s)://<ip or domain name>:<api-port>/.

api:
  dist_dir : "<dist directory>"

Command Example

Start service

goconserver &                     # for debug
service goconserver start         # only support systemd system

Define testnode node session

congo is the client command. Use congo help to see the detail.

congo create testnode driver=ssh ondemand=false --params user=root,host=10.5.102.73,port=22,password=<password>

or with ssh private key

congo create testnode driver=ssh ondemand=false --params user=root,host=10.5.102.73,port=22,private_key=<priavte_key_path>

or general command driver

congo create testnode driver=cmd ondemand=false --params cmd="ssh -l root -p 22 10.5.102.73"

List or show detail

congo list
congo show testnode

Connect to the testnode session

congo console testnode

Rest API

Rest api support bulk interface to manage the console sessions. Please refer to rest api for detail.