Virtual Sensor

Virtual sensor descriptions.

Helpful libraries

• JSON in modern C++
• Boost C++ Libraries
• Kafka Client

Data collection

Payload's content interfaces

interface Process {
    name: string;
    pid: number
    parentPid: number
    uid: number
    gid: number
    executePath: string
    command: string
    virtualMemoryUsage: number  // In KB
    physicalMemoryUsage: number // In KB
    cpuTime: number             // In ms
    cpuUsage: number            // In %
    networkInBandwidth: number  // What interface ???
    networkOutBandwidth: number
    ioWrite: number             // In KB
    ioRead: number              // In KB
}

interface NetworkInterface {
    name: string
    inBandwidth: number
    outBandwidth: number
}

interface Memory {
    used: number
    available: number
    swapUsed?: number
    swapFree?: number
}

interface Cpu {
    user: number
    nice: number
    system: number
    iowait: number
    steal: number
    idle: number
}

interface IOUsage {
    deviceName: string
    readPerSecond: number
    writePerSecond: number
}

interface DiskUsage {
    filesystemName: string
    used: number // In KB
    available: number // In KB
}

Full payload interface

interface KafkaMessage {
    nodeId: number
    timestamp: number
    payload: Process[] | NetworkInterface[] | Memory | Cpu | IOUsage | DiskUsage
    type: 'PROCESS' | 'NETWORK_INTERFACE' | 'MEMORY' | 'CPU' | 'IO_USAGE' | 'DISK_USAGE'
}

Data in namespace

Note that a process runs in container such as Docker, LXC ... or runs in a VM has its own namespace.

Sample data from /proc/$PID/net/dev file

Helpful tools

Some useful command lines:

• sysstat
• df
• free

Build systemd service

https://www.tecmint.com/create-systemd-service-linux/