{
  "metadata": {
    "os": "Linux",
    "hostname": "example-ubuntu-host",
    "timestamp": "2026-05-08T02:30:00Z",
    "module": "all",
    "format": "json",
    "script": "linux-health-check.sh"
  },
  "modules": {
    "system": {
      "status": "ok",
      "commands": [
        {
          "name": "uname",
          "command": "uname -a",
          "exit_code": 0,
          "output": "Linux example-ubuntu-host 5.15.0-122-generic #132-Ubuntu SMP x86_64 GNU/Linux"
        },
        {
          "name": "os-release",
          "command": "cat /etc/os-release",
          "exit_code": 0,
          "output": "NAME=\"Ubuntu\"\nVERSION=\"22.04.5 LTS (Jammy Jellyfish)\"\nID=ubuntu\nVERSION_ID=\"22.04\"\nVERSION_CODENAME=jammy"
        },
        {
          "name": "uptime",
          "command": "uptime",
          "exit_code": 0,
          "output": " 02:30:00 up 12 days,  3:11,  1 user,  load average: 0.08, 0.12, 0.09"
        },
        {
          "name": "memory",
          "command": "free -h",
          "exit_code": 0,
          "output": "               total        used        free      shared  buff/cache   available\nMem:            15Gi       3.1Gi       9.4Gi       120Mi       2.8Gi        11Gi\nSwap:          4.0Gi          0B       4.0Gi"
        }
      ],
      "warnings": [],
      "errors": []
    },
    "disk": {
      "status": "ok",
      "commands": [
        {
          "name": "disk",
          "command": "df -h",
          "exit_code": 0,
          "output": "Filesystem      Size  Used Avail Use% Mounted on\n/dev/vda1        80G   32G   48G   40% /"
        },
        {
          "name": "inodes",
          "command": "df -i",
          "exit_code": 0,
          "output": "Filesystem     Inodes  IUsed  IFree IUse% Mounted on\n/dev/vda1         5.0M   180K   4.8M    4% /"
        }
      ],
      "warnings": [],
      "errors": []
    },
    "network": {
      "status": "ok",
      "commands": [
        {
          "name": "listening_ports",
          "command": "ss -tulnp",
          "exit_code": 0,
          "output": "Netid State  Recv-Q Send-Q Local Address:Port Peer Address:Port\ntcp   LISTEN 0      128    0.0.0.0:22      0.0.0.0:*"
        },
        {
          "name": "routes",
          "command": "ip route",
          "exit_code": 0,
          "output": "default via 192.0.2.1 dev eth0 proto dhcp src 192.0.2.20\n192.0.2.0/24 dev eth0 proto kernel scope link src 192.0.2.20"
        }
      ],
      "warnings": [],
      "errors": []
    },
    "service": {
      "status": "ok",
      "commands": [
        {
          "name": "failed_services",
          "command": "systemctl --failed --no-pager",
          "exit_code": 0,
          "output": "  UNIT LOAD ACTIVE SUB DESCRIPTION\n0 loaded units listed."
        }
      ],
      "warnings": [],
      "errors": []
    },
    "process": {
      "status": "ok",
      "commands": [
        {
          "name": "top_cpu",
          "command": "ps aux --sort=-%cpu | head -n 10",
          "exit_code": 0,
          "output": "USER PID %CPU %MEM COMMAND\nroot 1 0.1 0.2 /usr/lib/systemd/systemd"
        },
        {
          "name": "top_memory",
          "command": "ps aux --sort=-%mem | head -n 10",
          "exit_code": 0,
          "output": "USER PID %CPU %MEM COMMAND\nroot 800 0.2 1.1 /usr/bin/example-agent"
        }
      ],
      "warnings": [],
      "errors": []
    },
    "package": {
      "status": "ok",
      "commands": [
        {
          "name": "package_managers",
          "command": "for c in apt apt-get dnf yum zypper pacman rpm dpkg; do ...",
          "exit_code": 0,
          "output": "== apt ==\napt 2.4.13 (amd64)\n== apt-get ==\napt 2.4.13 (amd64)\n== dpkg ==\nDebian dpkg package management program version 1.21.1 (amd64)."
        },
        {
          "name": "apt_policy",
          "command": "apt-cache policy",
          "exit_code": 0,
          "output": "Package files:\n 100 /var/lib/dpkg/status\n     release a=now\n 500 http://mirror.example.com/ubuntu jammy/main amd64 Packages\n     release v=22.04,o=Ubuntu,a=jammy,n=jammy,l=Ubuntu,c=main,b=amd64"
        }
      ],
      "warnings": [],
      "errors": []
    },
    "security": {
      "status": "ok",
      "commands": [
        {
          "name": "sshd_config",
          "command": "grep -E '^(PermitRootLogin|PasswordAuthentication|PubkeyAuthentication|Port)\\b' /etc/ssh/sshd_config || true",
          "exit_code": 0,
          "output": "Port 22\nPermitRootLogin no\nPasswordAuthentication no\nPubkeyAuthentication yes"
        },
        {
          "name": "sudo_version",
          "command": "sudo -V",
          "exit_code": 0,
          "output": "Sudo version 1.9.9"
        },
        {
          "name": "firewall_state",
          "command": "ufw status",
          "exit_code": 0,
          "output": "Status: active"
        },
        {
          "name": "apparmor",
          "command": "aa-status",
          "exit_code": 0,
          "output": "apparmor module is loaded.\n12 profiles are in enforce mode."
        }
      ],
      "warnings": [],
      "errors": []
    },
    "container": {
      "status": "warning",
      "commands": [
        {
          "name": "docker_version",
          "command": "docker version",
          "exit_code": 0,
          "output": "Client: Docker Engine - Community\n Version: 27.3.1\nServer: Docker Engine - Community\n Version: 27.3.1"
        },
        {
          "name": "docker_ps",
          "command": "docker ps --format 'table {{.Names}}\\t{{.Image}}\\t{{.Status}}\\t{{.Ports}}'",
          "exit_code": 0,
          "output": "NAMES          IMAGE               STATUS    PORTS\nexample-nginx  example/nginx:1.27  Up 2 days 127.0.0.1:8080->80/tcp"
        }
      ],
      "warnings": [
        {
          "name": "kubectl",
          "message": "Command not available: kubectl"
        }
      ],
      "errors": []
    },
    "log": {
      "status": "ok",
      "commands": [
        {
          "name": "journal_errors",
          "command": "journalctl -p 3 -n 50 --no-pager",
          "exit_code": 0,
          "output": "-- No entries --"
        },
        {
          "name": "journal_disk_usage",
          "command": "journalctl --disk-usage",
          "exit_code": 0,
          "output": "Archived and active journals take up 96.0M in the file system."
        },
        {
          "name": "kernel_warnings",
          "command": "dmesg -T --level=err,warn",
          "exit_code": 0,
          "output": ""
        },
        {
          "name": "var_log_usage",
          "command": "du -sh /var/log 2>/dev/null || true",
          "exit_code": 0,
          "output": "180M\t/var/log"
        }
      ],
      "warnings": [],
      "errors": []
    }
  },
  "summary": {
    "status": "warning",
    "warnings_count": 1,
    "errors_count": 0
  },
  "errors": []
}