Droplet Maintainer

This is a simple script that will stop and start Droplet instances if it fails to GET a particular URL. This is useful for maintaining Droplet instances that are not behind a load balancer.

Flowchart

+-------------------+
|       Start       |
+-------------------+
        |
        v
+-------------------+
|   Initialize      |
|    variables      |
+-------------------+
        |
        v
+-------------------+
|  Enter while      |
|    loop           |
+-------------------+        
        |                    
        |                    
        |<-------------------+<-----+
        |                    |      |
        v                    |      |      
+------------------==-+      |      |
|  URL reachable      |>-----+  YES |      
|  for T amount       |             |
+---------------------+             |
|   Continue loop     |             |
|       |             |             |
+-------|-------------+             |
        |       v  ^                |
        |       |no|                |
        | No    +--+                |
        v                           |
+------------------------+          |
|Restart the EC2 server  |          |
| (handle                |          |
|  unreachable URL)      |          |
+------------------------+          |
        + --------->----------------+

Configuration

Since whole point is to maintain Droplet instnace. this is made to be hosted on a different machine. that have no connection to the Droplet instance you are monitoring.

You can get digitalocean_token from Application & API page.

{
    "i-03cdcee6a9ea8be78": {
        "location": {
            "url": "https://streamsnip.com",
            "headers": {},
            "response_code" : 200,
            "timeout" : 10
        },
        "digitalocean_token": "",
        "interval": 60,
        "tolerance" : 10,
        "discord": "https://discord.com/api/webhooks/1205223388512124990/ub640V3iN-"
    }
}

Installation

pip install -r requirements.txt

Usage

python main.py

Crontab

@reboot cd /root/droplet_maitainer && nohup python3 main.py &