SkyWalking
Linux Monitoring
SkyWalking leverages Prometheus node-exporter to collect metrics data from the VMs and leverages OpenTelemetry Collector to transfer the metrics to
OpenTelemetry receiver and into the Meter System.
VM entity as a Service in OAP and on the Layer: OS_LINUX.
Data flow
- The Prometheus node-exporter collects metrics data from the VMs.
- The OpenTelemetry Collector fetches metrics from node-exporter via Prometheus Receiver and pushes metrics to the SkyWalking OAP Server via the OpenCensus gRPC Exporter.
- The SkyWalking OAP Server parses the expression with MAL to filter/calculate/aggregate and store the results.
Setup
- Setup Prometheus node-exporter.
- Setup OpenTelemetry Collector . This is an example for OpenTelemetry Collector configuration otel-collector-config.yaml.
- Config SkyWalking OpenTelemetry receiver.
Supported Metrics
| Monitoring Panel | Unit | Metric Name | Description | Data Source |
|---|---|---|---|---|
| CPU Usage | % | cpu_total_percentage | The total percentage usage of the CPU core. If there are 2 cores, the maximum usage is 200%. | Prometheus node-exporter |
| Memory RAM Usage | MB | meter_vm_memory_used | The total RAM usage | Prometheus node-exporter |
| Memory Swap Usage | % | meter_vm_memory_swap_percentage | The percentage usage of swap memory | Prometheus node-exporter |
| CPU Average Used | % | meter_vm_cpu_average_used | The percentage usage of the CPU core in each mode | Prometheus node-exporter |
| CPU Load | meter_vm_cpu_load1 meter_vm_cpu_load5 meter_vm_cpu_load15 |
The CPU 1m / 5m / 15m average load | Prometheus node-exporter | |
| Memory RAM | MB | meter_vm_memory_total meter_vm_memory_available meter_vm_memory_used |
The RAM statistics, including Total / Available / Used | Prometheus node-exporter |
| Memory Swap | MB | meter_vm_memory_swap_free meter_vm_memory_swap_total |
Swap memory statistics, including Free / Total | Prometheus node-exporter |
| File System Mountpoint Usage | % | meter_vm_filesystem_percentage | The percentage usage of the file system at each mount point | Prometheus node-exporter |
| Disk R/W | KB/s | meter_vm_disk_read,meter_vm_disk_written | The disk read and written | Prometheus node-exporter |
| Network Bandwidth Usage | KB/s | meter_vm_network_receive meter_vm_network_transmit |
The network receive and transmit | Prometheus node-exporter |
| Network Status | meter_vm_tcp_curr_estab meter_vm_tcp_tw meter_vm_tcp_alloc meter_vm_sockets_used meter_vm_udp_inuse |
The number of TCPs established / TCP time wait / TCPs allocated / sockets in use / UDPs in use | Prometheus node-exporter | |
| Filefd Allocated | meter_vm_filefd_allocated | The number of file descriptors allocated | Prometheus node-exporter |
Customizing
You can customize your own metrics/expression/dashboard panel.
The metrics definition and expression rules are found in /config/otel-oc-rules/vm.yaml.
The dashboard panel confirmations are found in /config/ui-initialized-templates/os_linux.
Blog
For more details, see the blog article SkyWalking 8.4 provides infrastructure monitoring.