监控架构 - Node_exporter 系统监控组件 - AirPlan

0x00 起源

学习 node export 存的

0x01 Collector

通过 http://IP:9100/metrics 查看当前主机监控信息
Node export 通过Collector代码块收集系统性能指标

以下内容引用 Prometeus/Node_export README 每个操作系统上的 Collectors 都有不同的支持。下表列出了所有现有 Collectors 和支持的系统。

通过 --collector.<name> 参数启用相应的 Collectors
通过 --no-collector.<name> 参数禁用默认已经启动的 Collectors

默认开启的监控类型

Name	Description	OS
arp	Exposes ARP statistics from `/proc/net/arp`.	Linux
bcache	Exposes bcache statistics from `/sys/fs/bcache/`.	Linux
bonding	Exposes the number of configured and active slaves of Linux bonding interfaces.	Linux
conntrack	Shows conntrack statistics (does nothing if no `/proc/sys/net/netfilter/` present).	Linux
cpu	Exposes CPU statistics	Darwin, Dragonfly, FreeBSD, Linux
diskstats	Exposes disk I/O statistics.	Darwin, Linux
edac	Exposes error detection and correction statistics.	Linux
entropy	Exposes available entropy.	Linux
exec	Exposes execution statistics.	Dragonfly, FreeBSD
filefd	Exposes file descriptor statistics from `/proc/sys/fs/file-nr`.	Linux
filesystem	Exposes filesystem statistics, such as disk space used.	Darwin, Dragonfly, FreeBSD, Linux, OpenBSD
hwmon	Expose hardware monitoring and sensor data from `/sys/class/hwmon/`.	Linux
infiniband	Exposes network statistics specific to InfiniBand and Intel OmniPath configurations.	Linux
ipvs	Exposes IPVS status from `/proc/net/ip_vs` and stats from `/proc/net/ip_vs_stats`.	Linux
loadavg	Exposes load average.	Darwin, Dragonfly, FreeBSD, Linux, NetBSD, OpenBSD, Solaris
mdadm	Exposes statistics about devices in `/proc/mdstat` (does nothing if no `/proc/mdstat` present).	Linux
meminfo	Exposes memory statistics.	Darwin, Dragonfly, FreeBSD, Linux, OpenBSD
netdev	Exposes network interface statistics such as bytes transferred.	Darwin, Dragonfly, FreeBSD, Linux, OpenBSD
netstat	Exposes network statistics from `/proc/net/netstat`. This is the same information as `netstat -s`.	Linux
nfs	Exposes NFS client statistics from `/proc/net/rpc/nfs`. This is the same information as `nfsstat -c`.	Linux
nfsd	Exposes NFS kernel server statistics from `/proc/net/rpc/nfsd`. This is the same information as `nfsstat -s`.	Linux
sockstat	Exposes various statistics from `/proc/net/sockstat`.	Linux
stat	Exposes various statistics from `/proc/stat`. This includes boot time, forks and interrupts.	Linux
textfile	Exposes statistics read from local disk. The `--collector.textfile.directory` flag must be set.	any
time	Exposes the current system time.	any
timex	Exposes selected adjtimex(2) system call stats.	Linux
uname	Exposes system information as provided by the uname system call.	Linux
vmstat	Exposes statistics from `/proc/vmstat`.	Linux
wifi	Exposes WiFi device and station statistics.	Linux
xfs	Exposes XFS runtime statistics.	Linux (kernel 4.4+)
zfs	Exposes ZFS performance statistics.	Linux

默认关闭的监控类型

Name	Description	OS
buddyinfo	Exposes statistics of memory fragments as reported by /proc/buddyinfo.	Linux
devstat	Exposes device statistics	Dragonfly, FreeBSD
drbd	Exposes Distributed Replicated Block Device statistics (to version 8.4)	Linux
interrupts	Exposes detailed interrupts statistics.	Linux, OpenBSD
ksmd	Exposes kernel and system statistics from `/sys/kernel/mm/ksm`.	Linux
logind	Exposes session counts from logind.	Linux
meminfo_numa	Exposes memory statistics from `/proc/meminfo_numa`.	Linux
mountstats	Exposes filesystem statistics from `/proc/self/mountstats`. Exposes detailed NFS client statistics.	Linux
ntp	Exposes local NTP daemon health to check time	any
qdisc	Exposes queuing discipline statistics	Linux
runit	Exposes service status from runit.	any
supervisord	Exposes service status from supervisord.	any
systemd	Exposes service and system status from systemd.	Linux
tcpstat	Exposes TCP connection status information from `/proc/net/tcp` and `/proc/net/tcp6`. (Warning: the current version has potential performance issues in high load situations.)	Linux

命令行参数

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usage: node_exporter [<flags>]

Flags:
  -h, --help                    Show context-sensitive help (also try --help-long and --help-man).
      --collector.diskstats.ignored-devices="^(ram|loop|fd|(h|s|v|xv)d[a-z]|nvme\\d+n\\d+p)\\d+$"
                                Regexp of devices to ignore for diskstats.
      --collector.filesystem.ignored-mount-points="^/(sys|proc|dev)($|/)"
                                Regexp of mount points to ignore for filesystem collector.
      --collector.filesystem.ignored-fs-types="^(sys|proc|auto)fs$"
                                Regexp of filesystem types to ignore for filesystem collector.
      --collector.megacli.command="megacli"
                                Command to run megacli.
      --collector.netdev.ignored-devices="^$"
                                Regexp of net devices to ignore for netdev collector.
      --collector.ntp.server="127.0.0.1"
                                NTP server to use for ntp collector
      --collector.ntp.protocol-version=4
                                NTP protocol version
      --collector.ntp.server-is-local
                                Certify that collector.ntp.server address is the same local host as this collector.
      --collector.ntp.ip-ttl=1  IP TTL to use while sending NTP query
      --collector.ntp.max-distance=3.46608s
                                Max accumulated distance to the root
      --collector.ntp.local-offset-tolerance=1ms
                                Offset between local clock and local ntpd time to tolerate
      --path.procfs="/proc"     procfs mountpoint.
      --path.sysfs="/sys"       sysfs mountpoint.
      --collector.qdisc.fixtures=""
                                test fixtures to use for qdisc collector end-to-end testing
      --collector.runit.servicedir="/etc/service"
                                Path to runit service directory.
      --collector.supervisord.url="http://localhost:9001/RPC2"
                                XML RPC endpoint.
      --collector.systemd.unit-whitelist=".+"
                                Regexp of systemd units to whitelist. Units must both match whitelist and not match blacklist to be included.
      --collector.systemd.unit-blacklist=".+\\.scope"
                                Regexp of systemd units to blacklist. Units must both match whitelist and not match blacklist to be included.
      --collector.systemd.private
                                Establish a private, direct connection to systemd without dbus.
      --collector.textfile.directory=""
                                Directory to read text files with metrics from.
      --collector.wifi.fixtures=""
                                test fixtures to use for wifi collector metrics
      --collector.arp           Enable the arp collector (default: enabled).
      --collector.bcache        Enable the bcache collector (default: enabled).
      --collector.bonding       Enable the bonding collector (default: disabled).
      --collector.buddyinfo     Enable the buddyinfo collector (default: disabled).
      --collector.conntrack     Enable the conntrack collector (default: enabled).
      --collector.cpu           Enable the cpu collector (default: enabled).
      --collector.diskstats     Enable the diskstats collector (default: enabled).
      --collector.drbd          Enable the drbd collector (default: disabled).
      --collector.edac          Enable the edac collector (default: enabled).
      --collector.entropy       Enable the entropy collector (default: enabled).
      --collector.filefd        Enable the filefd collector (default: enabled).
      --collector.filesystem    Enable the filesystem collector (default: enabled).
      --collector.gmond         Enable the gmond collector (default: disabled).
      --collector.hwmon         Enable the hwmon collector (default: enabled).
      --collector.infiniband    Enable the infiniband collector (default: enabled).
      --collector.interrupts    Enable the interrupts collector (default: disabled).
      --collector.ipvs          Enable the ipvs collector (default: enabled).
      --collector.ksmd          Enable the ksmd collector (default: disabled).
      --collector.loadavg       Enable the loadavg collector (default: enabled).
      --collector.logind        Enable the logind collector (default: disabled).
      --collector.mdadm         Enable the mdadm collector (default: enabled).
      --collector.megacli       Enable the megacli collector (default: disabled).
      --collector.meminfo       Enable the meminfo collector (default: enabled).
      --collector.meminfo_numa  Enable the meminfo_numa collector (default: disabled).
      --collector.mountstats    Enable the mountstats collector (default: disabled).
      --collector.netdev        Enable the netdev collector (default: enabled).
      --collector.netstat       Enable the netstat collector (default: enabled).
      --collector.nfs           Enable the nfs collector (default: disabled).
      --collector.ntp           Enable the ntp collector (default: disabled).
      --collector.qdisc         Enable the qdisc collector (default: disabled).
      --collector.runit         Enable the runit collector (default: disabled).
      --collector.sockstat      Enable the sockstat collector (default: enabled).
      --collector.stat          Enable the stat collector (default: enabled).
      --collector.supervisord   Enable the supervisord collector (default: disabled).
      --collector.systemd       Enable the systemd collector (default: disabled).
      --collector.tcpstat       Enable the tcpstat collector (default: disabled).
      --collector.textfile      Enable the textfile collector (default: enabled).
      --collector.time          Enable the time collector (default: enabled).
      --collector.uname         Enable the uname collector (default: enabled).
      --collector.vmstat        Enable the vmstat collector (default: enabled).
      --collector.wifi          Enable the wifi collector (default: enabled).
      --collector.xfs           Enable the xfs collector (default: enabled).
      --collector.zfs           Enable the zfs collector (default: enabled).
      --collector.timex         Enable the timex collector (default: enabled).
      --web.listen-address=":9100"
                                Address on which to expose metrics and web interface.
      --web.telemetry-path="/metrics"
                                Path under which to expose metrics.
      --log.level="info"        Only log messages with the given severity or above. Valid levels: [debug, info, warn, error, fatal]
      --log.format="logger:stderr"
                                Set the log target and format. Example: "logger:syslog?appname=bob&local=7" or "logger:stdout?json=true"
      --version                 Show application version.

关闭指定 collector 模块

使用 prometheus.NewRegistry 判断并注册相关模块
- 引用 –no-collector 参数

关闭指定模块启动

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[root@jeff bin]$ ./node_exporter --no-collector.arp --no-collector.bcache --no-collector.conntrack --no-collector.cpu --no-collector.diskstats --no-collector.edac --no-collector.entropy --no-collector.filefd --no-collector.filesystem  --no-collector.hwmon  --no-collector.infiniband  --no-collector.ipvs  --no-collector.loadavg --no-collector.mdadm  --no-collector.meminfo --no-collector.netdev --no-collector.netstat  --no-collector.sockstat  --no-collector.stat  --no-collector.textfile  --no-collector.time  --no-collector.timex  --no-collector.uname  --no-collector.vmstat  --no-collector.wifi  --no-collector.xfs  --no-collector.zfs
INFO[0000] Starting node_exporter (version=0.15.2, branch=HEAD, revision=98bc64930d34878b84a0f87dfe6e1a6da61e532d)  source="node_exporter.go:43"
INFO[0000] Build context (go=go1.9.2, user=root@d5c4792c921f, date=20171205-14:50:53)  source="node_exporter.go:44"
INFO[0000] Enabled collectors:                           source="node_exporter.go:50"
INFO[0000] Listening on :9100                            source="node_exporter.go:76"

默认启动组件

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[root@jeff bin]$ ./node_exporter
INFO[0000] Starting node_exporter (version=0.15.2, branch=HEAD, revision=98bc64930d34878b84a0f87dfe6e1a6da61e532d)  source="node_exporter.go:43"
INFO[0000] Build context (go=go1.9.2, user=root@d5c4792c921f, date=20171205-14:50:53)  source="node_exporter.go:44"
INFO[0000] No directory specified, see --collector.textfile.directory  source="textfile.go:57"
INFO[0000] Enabled collectors:                           source="node_exporter.go:50"
INFO[0000]  - hwmon                                      source="node_exporter.go:52"
INFO[0000]  - diskstats                                  source="node_exporter.go:52"
INFO[0000]  - infiniband                                 source="node_exporter.go:52"
INFO[0000]  - time                                       source="node_exporter.go:52"
INFO[0000]  - mdadm                                      source="node_exporter.go:52"
INFO[0000]  - netdev                                     source="node_exporter.go:52"
INFO[0000]  - stat                                       source="node_exporter.go:52"
INFO[0000]  - arp                                        source="node_exporter.go:52"
INFO[0000]  - vmstat                                     source="node_exporter.go:52"
INFO[0000]  - meminfo                                    source="node_exporter.go:52"
INFO[0000]  - xfs                                        source="node_exporter.go:52"
INFO[0000]  - conntrack                                  source="node_exporter.go:52"
INFO[0000]  - bcache                                     source="node_exporter.go:52"
INFO[0000]  - loadavg                                    source="node_exporter.go:52"
INFO[0000]  - textfile                                   source="node_exporter.go:52"
INFO[0000]  - sockstat                                   source="node_exporter.go:52"
INFO[0000]  - wifi                                       source="node_exporter.go:52"
INFO[0000]  - uname                                      source="node_exporter.go:52"
INFO[0000]  - zfs                                        source="node_exporter.go:52"
INFO[0000]  - ipvs                                       source="node_exporter.go:52"
INFO[0000]  - entropy                                    source="node_exporter.go:52"
INFO[0000]  - netstat                                    source="node_exporter.go:52"
INFO[0000]  - filesystem                                 source="node_exporter.go:52"
INFO[0000]  - filefd                                     source="node_exporter.go:52"
INFO[0000]  - edac                                       source="node_exporter.go:52"
INFO[0000]  - timex                                      source="node_exporter.go:52"
INFO[0000]  - cpu                                        source="node_exporter.go:52"
INFO[0000] Listening on :9100                            source="node_exporter.go:76"

0x02 采集分析主机指标

以下部分内容引用 GPE 监控预警系统-node_exporter

文本格式

在讨论 Exporter 之前，有必要先介绍一下 Prometheus 文本数据格式，因为一个 Exporter 本质上就是将收集的数据，转化为对应的文本格式，并提供 http 请求。

Exporter 收集的数据转化的文本内容以行 (\n) 为单位，空行将被忽略, 文本内容最后一行为空行。

注释

文本内容，如果以 # 开头通常表示注释

以 # HELP 开头表示 metric 帮助说明
以 # TYPE 开头表示定义 metric 类型，包含 counter, gauge, histogram, summary, 和 untyped 类型
其他表示一般注释，供阅读使用，将被 Prometheus 忽略

采样数据

内容如果不以 # 开头，表示采样数据。它通常紧挨着类型定义行，满足以下格式(primaryExpr parses a primary expression.)：

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metric_name [
  "{" label_name "=" `"` label_value `"` { "," label_name "=" `"` label_value `"` } [ "," ] "}"
] value [ timestamp ]

使用 curl http://127.0.0.1:9100/metrics 获取信息如下(部分数据)：
- 需要特别注意的是，假设采样数据 metric 叫做 x, 如果 x 是 histogram 或 summary 类型必需满足以下条件：
  - 采样数据的总和应表示为 x_sum
  - 采样数据的总量应表示为 x_count
  - summary 类型的采样数据的 quantile 应表示为 x{quantile=“y”}
  - histogram 类型的采样分区统计数据将表示为 x_bucket{le=“y”}
  - histogram 类型的采样必须包含 x_bucket{le="+Inf"}, 它的值等于 x_count 的值
  - summary 和 historam 中 quantile 和 le 必需按从小到大顺序排列

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# HELP go_gc_duration_seconds A summary of the GC invocation durations.
# TYPE go_gc_duration_seconds summary
go_gc_duration_seconds{quantile="0"} 0
go_gc_duration_seconds{quantile="0.25"} 0
go_gc_duration_seconds{quantile="0.5"} 0
go_gc_duration_seconds{quantile="0.75"} 0
go_gc_duration_seconds{quantile="1"} 0
go_gc_duration_seconds_sum 0
go_gc_duration_seconds_count 0
# HELP go_goroutines Number of goroutines that currently exist.
# TYPE go_goroutines gauge
go_goroutines 8
# HELP go_info Information about the Go environment.
# TYPE go_info gauge
go_info{version="go1.9.2"} 1
# HELP go_memstats_alloc_bytes Number of bytes allocated and still in use.
# TYPE go_memstats_alloc_bytes gauge
go_memstats_alloc_bytes 1.229584e+06
# HELP go_memstats_alloc_bytes_total Total number of bytes allocated, even if freed.
# TYPE go_memstats_alloc_bytes_total counter
go_memstats_alloc_bytes_total 1.229584e+06
# HELP go_memstats_buck_hash_sys_bytes Number of bytes used by the profiling bucket hash table.
# TYPE go_memstats_buck_hash_sys_bytes gauge
go_memstats_buck_hash_sys_bytes 1.443396e+06
# HELP go_memstats_frees_total Total number of frees.
# TYPE go_memstats_frees_total counter
go_memstats_frees_total 455
# HELP go_memstats_gc_cpu_fraction The fraction of this program's available CPU time used by the GC since the program started.
# TYPE go_memstats_gc_cpu_fraction gauge
go_memstats_gc_cpu_fraction 0
# HELP go_memstats_gc_sys_bytes Number of bytes used for garbage collection system metadata.
# TYPE go_memstats_gc_sys_bytes gauge
go_memstats_gc_sys_bytes 169984
# HELP go_memstats_heap_alloc_bytes Number of heap bytes allocated and still in use.
# TYPE go_memstats_heap_alloc_bytes gauge
go_memstats_heap_alloc_bytes 1.229584e+06
# HELP go_memstats_heap_idle_bytes Number of heap bytes waiting to be used.
# TYPE go_memstats_heap_idle_bytes gauge
go_memstats_heap_idle_bytes 622592
# HELP go_memstats_heap_inuse_bytes Number of heap bytes that are in use.
# TYPE go_memstats_heap_inuse_bytes gauge
go_memstats_heap_inuse_bytes 2.12992e+06
# HELP go_memstats_heap_objects Number of allocated objects.
# TYPE go_memstats_heap_objects gauge
go_memstats_heap_objects 8912
# HELP go_memstats_heap_released_bytes Number of heap bytes released to OS.
# TYPE go_memstats_heap_released_bytes gauge
go_memstats_heap_released_bytes 0
# HELP go_memstats_heap_sys_bytes Number of heap bytes obtained from system.
# TYPE go_memstats_heap_sys_bytes gauge
go_memstats_heap_sys_bytes 2.752512e+06
# HELP go_memstats_last_gc_time_seconds Number of seconds since 1970 of last garbage collection.
# TYPE go_memstats_last_gc_time_seconds gauge
go_memstats_last_gc_time_seconds 0
# HELP go_memstats_lookups_total Total number of pointer lookups.
# TYPE go_memstats_lookups_total counter
go_memstats_lookups_total 17
# HELP go_memstats_mallocs_total Total number of mallocs.
# TYPE go_memstats_mallocs_total counter
go_memstats_mallocs_total 9367
# HELP go_memstats_mcache_inuse_bytes Number of bytes in use by mcache structures.
# TYPE go_memstats_mcache_inuse_bytes gauge
go_memstats_mcache_inuse_bytes 6944
# HELP go_memstats_mcache_sys_bytes Number of bytes used for mcache structures obtained from system.
# TYPE go_memstats_mcache_sys_bytes gauge
go_memstats_mcache_sys_bytes 16384
# HELP go_memstats_mspan_inuse_bytes Number of bytes in use by mspan structures.
# TYPE go_memstats_mspan_inuse_bytes gauge
go_memstats_mspan_inuse_bytes 31616
# HELP go_memstats_mspan_sys_bytes Number of bytes used for mspan structures obtained from system.
# TYPE go_memstats_mspan_sys_bytes gauge
go_memstats_mspan_sys_bytes 32768
# HELP go_memstats_next_gc_bytes Number of heap bytes when next garbage collection will take place.
# TYPE go_memstats_next_gc_bytes gauge
go_memstats_next_gc_bytes 4.473924e+06
# HELP go_memstats_other_sys_bytes Number of bytes used for other system allocations.
# TYPE go_memstats_other_sys_bytes gauge
go_memstats_other_sys_bytes 797364
# HELP go_memstats_stack_inuse_bytes Number of bytes in use by the stack allocator.
# TYPE go_memstats_stack_inuse_bytes gauge
go_memstats_stack_inuse_bytes 393216
# HELP go_memstats_stack_sys_bytes Number of bytes obtained from system for stack allocator.
# TYPE go_memstats_stack_sys_bytes gauge
go_memstats_stack_sys_bytes 393216
# HELP go_memstats_sys_bytes Number of bytes obtained from system.
# TYPE go_memstats_sys_bytes gauge
go_memstats_sys_bytes 5.605624e+06
# HELP go_threads Number of OS threads created.
# TYPE go_threads gauge
go_threads 7
# HELP http_request_duration_microseconds The HTTP request latencies in microseconds.
# TYPE http_request_duration_microseconds summary
http_request_duration_microseconds{handler="prometheus",quantile="0.5"} NaN
http_request_duration_microseconds{handler="prometheus",quantile="0.9"} NaN
http_request_duration_microseconds{handler="prometheus",quantile="0.99"} NaN
http_request_duration_microseconds_sum{handler="prometheus"} 0
http_request_duration_microseconds_count{handler="prometheus"} 0
# HELP http_request_size_bytes The HTTP request sizes in bytes.
# TYPE http_request_size_bytes summary
http_request_size_bytes{handler="prometheus",quantile="0.5"} NaN
http_request_size_bytes{handler="prometheus",quantile="0.9"} NaN
http_request_size_bytes{handler="prometheus",quantile="0.99"} NaN
http_request_size_bytes_sum{handler="prometheus"} 0
http_request_size_bytes_count{handler="prometheus"} 0
# HELP http_response_size_bytes The HTTP response sizes in bytes.
# TYPE http_response_size_bytes summary
http_response_size_bytes{handler="prometheus",quantile="0.5"} NaN
http_response_size_bytes{handler="prometheus",quantile="0.9"} NaN
http_response_size_bytes{handler="prometheus",quantile="0.99"} NaN
http_response_size_bytes_sum{handler="prometheus"} 0
http_response_size_bytes_count{handler="prometheus"} 0
# HELP node_exporter_build_info A metric with a constant '1' value labeled by version, revision, branch, and goversion from which node_exporter was built.
# TYPE node_exporter_build_info gauge
node_exporter_build_info{branch="HEAD",goversion="go1.9.2",revision="98bc64930d34878b84a0f87dfe6e1a6da61e532d",version="0.15.2"} 1
# HELP process_cpu_seconds_total Total user and system CPU time spent in seconds.
# TYPE process_cpu_seconds_total counter
process_cpu_seconds_total 0.01
# HELP process_max_fds Maximum number of open file descriptors.
# TYPE process_max_fds gauge
process_max_fds 1e+06
# HELP process_open_fds Number of open file descriptors.
# TYPE process_open_fds gauge
process_open_fds 7
# HELP process_resident_memory_bytes Resident memory size in bytes.
# TYPE process_resident_memory_bytes gauge
process_resident_memory_bytes 6.127616e+06
# HELP process_start_time_seconds Start time of the process since unix epoch in seconds.
# TYPE process_start_time_seconds gauge
process_start_time_seconds 1.52403869128e+09
# HELP process_virtual_memory_bytes Virtual memory size in bytes.
# TYPE process_virtual_memory_bytes gauge
process_virtual_memory_bytes 2.0353024e+08

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