docker.io Metrics from DataDog A

RATE: 函数，(当前采集值 - 上一个采集值) / 采集时间差

Name

• docker.io.write_bytes

• bytes/second
• Bytes written per second to disk by the processes of the container

• docker.io.read_bytes

• bytes/second
• Bytes read per second from disk by the processes of the container

计算公式

io_read = blkio.throttle.io_service_bytes文件中所有包含Read行的累计值
io_write = blkio.throttle.io_service_bytes文件中所有包含Write行的累计值

docker.io.write_bytes ＝ RATE(io_write)
docker.io.read_bytes = RATE(io_read)

文件位置

容器对应的blkio.throttle.io_service_bytes文件可能在如下三个目录中：

• /sys/fs/cgroup/blkio/docker/<container_id>/
• /sys/fs/cgroup/blkio/kubepods/burstable/<pod_id>/<container_id>/
• /sys/fs/cgroup/blkio/kubepods/besteffort/<pod_id>/<container_id>/

blkio.throttle.io_service_bytes文件示例内容如下：

cat blkio.throttle.io_service_bytes

7:0 Read 246784
7:0 Write 209481728
7:0 Sync 0
7:0 Async 209728512
7:0 Total 209728512
253:0 Read 246784
253:0 Write 209481728
253:0 Sync 0
253:0 Async 209728512
253:0 Total 209728512
253:2 Read 99832832
253:2 Write 267956224
253:2 Sync 58458112
253:2 Async 309330944
253:2 Total 367789056
Total 787246080