A simple node-red based remote command executor. The flows are scheduled using MQTT. The flow subscribes to a topic which is the hostname.
| Topic | Description |
|---|---|
hostname |
Subscribed by the host |
hostname/async |
Subscribed by the host |
hostname/output |
User command output stream |
hostname/status |
Retained messsage of last executed command |
client/hostname/config |
Birth message which is retained and includes config details like IP |
For details of the command line client goto ./client
Git clone the repo and run the install script as follows.
git clone http://github.com/sajayantony/cmdport
sudo ./cmdport/scripts/install.sh testbroker testuser testpassword
This sets up the flow and connects to the broker and makes the machine ready for remote commands. Refer install.sh for details.
The following commands should be used to setup or remove the agent as needed.
sudo update-rc.d cmdport defaults
sudo update-rc.d -f cmdport remove
-
Use the following instructions to setup an MQTT broker for command dispatch.
sudo apt-add-repository ppa:mosquitto-dev/mosquitto-ppa sudo apt-get update sudo apt-get -y install mosquitto sudo apt-get -y install mosquitto-clients -
Configure the password and disable anonymous access
sudo mosquitto_passwd -c /etc/mosquitto/pwfile <username> sudo nano /etc/mosquitto/mosquitto.conf -
Add the following
password_file /etc/mosquitto/pwfile allow_anonymous false -
Restart the service
sudo service mosquitto restart -
To be able to connect to the broker you need to open up the port 1883 for Mosquitto. Follow the bread crumb described below and allow incoming packets for port 1883 for Azure VMs.
VM >> Settings >> Network Interfaces >> Network Interface >> Settings >> Network Security Group >> Settings >> Inbound Rules