Client:

This app triggers every second to retrieve these figures and pushes them to a central server separately:

• PostgreSQL’s Sync delay time
• PostgreSQL’s amount of concurrent queries
• RAM (used/free)
• CPU usage (pecentage)
• Load Average (last 1 minute only)

Example of data stored in redis:

{
    "server_1": {
        "cpu_usage": 10000,
        "cpu_usage_updated_at": "2020-01-30 00:00:00",
        "delay": 100,
        "delay_updated_at": "2020-01-30 00:00:00",
    },
    "server_2": {...}
}

Getting Started:

1. Add credentials for daemon connection and psql access:

Fill credentials in file src/conf/sample_creds.conf and change its name to creds.conf

• host: the name of the Client, which will be stored as key in Redis
• psql: the target postgres database whose stats will be sent to daemon.
• daemon: the target server that figures will be sent to.

2. Authentication Setup:

1. Make sure we already have SSL certificates and key for server and client (Required):

openssl req -new -newkey rsa:2048 -days 365 -nodes -x509 -keyout server.key -out server.crt
openssl req -new -newkey rsa:2048 -days 365 -nodes -x509 -keyout client.key -out client.crt

Note: Common name for server must be your server hostname (ex: example.com), which is defined in daemon's host in file creds.conf

2. Put client.crt and client.key in /src

3. Make sure client's certificate (client.crt) has been added to the file that server uses to authenticate. The format for the file is:

-----BEGIN CERTIFICATE-----
client 1's certificate
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
client 2's certificate
-----END CERTIFICATE-----

3. Run App

python main.py

Options:

Config log path

The default log is src/main.log You can change path to log in conf/log.conf

Development

Each resource is retrieved and pushed to central server within a thread. The time waiting for each thread is 0.05s.

Test

The test in this project run a server and client in different processes.

Setup SSL

• For Server: Make sure server's and client's credentials (server.crt, server.key, client_certs.crt) are in test/creds.
• For Client: Make sure client's credentials ()

Make sure common name for server when creating certicate for Client is localhost.

Setup conf

Make sure creds.conf are properly set in test/conf

Run tests. In test/:

pytest --disable-warnings -s