333 lines
16 KiB
Plaintext
333 lines
16 KiB
Plaintext
PROMEX: A Prometheus exporter for HAProxy
|
|
-------------------------------------------
|
|
|
|
Prometheus is a monitoring and alerting system. More and more people use it to
|
|
monitor their environment (this is written February 2019). It collects metrics
|
|
from monitored targets by scraping metrics HTTP endpoints on these targets. For
|
|
HAProxy, The Prometheus team officially supports an exporter written in Go
|
|
(https://github.com/prometheus/haproxy_exporter). But it requires an extra
|
|
software to deploy and monitor. PROMEX, on its side, is a built-in Prometheus
|
|
exporter for HAProxy. It was developed as a service and is directly available in
|
|
HAProxy, like the stats applet.
|
|
|
|
However, PROMEX is not built by default with HAProxy. It is provided as an extra
|
|
component for everyone want to use it. So you need to explicitly build HAProxy
|
|
with the PROMEX service, using the Makefile variable "EXTRA_OBJS". For instance:
|
|
|
|
> make TARGET=linux-glibc EXTRA_OBJS="contrib/prometheus-exporter/service-prometheus.o"
|
|
|
|
if HAProxy provides the PROMEX service, the following build option will be
|
|
reported by the command "haproxy -vv":
|
|
|
|
Built with the Prometheus exporter as a service
|
|
|
|
To be used, it must be enabled in the configuration with an "http-request" rule
|
|
and the corresponding HTTP proxy must enable the HTX support. For instance:
|
|
|
|
frontend test
|
|
mode http
|
|
...
|
|
option http-use-htx
|
|
http-request use-service prometheus-exporter if { path /metrics }
|
|
...
|
|
|
|
|
|
This service has been developed as a third-party component because it could
|
|
become obsolete, depending on how much time Prometheus will remain heavily
|
|
used. This is said with no ulterior motive of course. Prometheus is a great
|
|
software and I hope all the well for it. But we involve in a environment moving
|
|
quickly and a solution may be obvious today could be deprecated the next
|
|
year. And because PROMEX is not integrated by default into the HAProxy codebase,
|
|
it will need some interest to be actively supported. All contribution of any
|
|
kind are welcome.
|
|
|
|
You must also be careful if you use with huge configurations. Unlike the stats
|
|
applet, all metrics are not grouped by service (proxy, listener or server). With
|
|
PROMEX, all lines for a given metric are provided as one single group. So
|
|
instead of collecting all metrics for a proxy before moving to the next one, we
|
|
must loop on all proxies for each metric. Same for the servers. Thus, it will
|
|
spend much more resources to produce the Prometheus metrics than the CSV export
|
|
through the stats page. To give a comparison order, quick benchmarks shown that
|
|
a PROMEX dump is 5x slower and 20x more verbose than a CSV export.
|
|
|
|
|
|
metrics filtering
|
|
-------------------
|
|
|
|
It is possible to dynamically select the metrics to export if you don't use all
|
|
of them passing parameters in the query-string.
|
|
|
|
* Filtering on scopes
|
|
|
|
The metrics may be filtered by scopes. Multiple parameters with "scope" as name
|
|
may be passed in the query-string to filter exported metrics, with one of those
|
|
values: global, frontend, backend, server or '*' (means all). A scope parameter
|
|
with no value means to filter out all scopes (nothing is returned). The scope
|
|
parameters are parsed in their appearance order in the query-string. So an empty
|
|
scope will reset all scopes already parsed. But it can be overridden by
|
|
following scope parameters in the query-string. By default everything is
|
|
exported. Here are examples:
|
|
|
|
/metrics?scope=server # ==> server metrics will be exported
|
|
/metrics?scope=frontend&scope=backend # ==> Frontend and backend metrics will be exported
|
|
/metrics?scope=*&scope= # ==> no metrics will be exported
|
|
/metrics?scope=&scope=global # ==> global metrics will be exported
|
|
/metrics?scope=sticktable # ==> stick tables metrics will be exported
|
|
|
|
* How do I prevent my prometheus instance to explode?
|
|
|
|
** Filtering on servers state
|
|
|
|
It is possible to exclude from returned metrics all servers in maintenance mode
|
|
passing the parameter "no-maint" in the query-string. This parameter may help to
|
|
solve performance issues of configuration that use the server templates to
|
|
manage dynamic provisionning. Note there is no consistency check on the servers
|
|
state. So, if the state of a server changes while the exporter is running, only
|
|
a part of the metrics for this server will be dumped.
|
|
|
|
prometheus example config:
|
|
|
|
For server-template users:
|
|
- <job>
|
|
params:
|
|
no-maint:
|
|
- empty
|
|
|
|
** Scrap server health checks only
|
|
|
|
All health checks status are dump through `state` label values. If you want to
|
|
scrap server health check status but prevent all server metrics to be saved,
|
|
except the server_check_status, you may configure prometheus that way:
|
|
|
|
- <job>
|
|
metric_relabel_configs:
|
|
- source_labels: ['__name__']
|
|
regex: 'haproxy_(process_|frontend_|backend_|server_check_status).*'
|
|
action: keep
|
|
|
|
Exported metrics
|
|
------------------
|
|
|
|
See prometheus export for the description of each field.
|
|
|
|
* Globals metrics
|
|
|
|
+------------------------------------------------+
|
|
| Metric name |
|
|
+------------------------------------------------+
|
|
| haproxy_process_nbthread |
|
|
| haproxy_process_nbproc |
|
|
| haproxy_process_relative_process_id |
|
|
| haproxy_process_uptime_seconds |
|
|
| haproxy_process_pool_failures_total |
|
|
| haproxy_process_max_fds |
|
|
| haproxy_process_max_sockets |
|
|
| haproxy_process_max_connections |
|
|
| haproxy_process_hard_max_connections |
|
|
| haproxy_process_current_connections |
|
|
| haproxy_process_connections_total |
|
|
| haproxy_process_requests_total |
|
|
| haproxy_process_max_ssl_connections |
|
|
| haproxy_process_current_ssl_connections |
|
|
| haproxy_process_ssl_connections_total |
|
|
| haproxy_process_max_pipes |
|
|
| haproxy_process_pipes_used_total |
|
|
| haproxy_process_pipes_free_total |
|
|
| haproxy_process_current_connection_rate |
|
|
| haproxy_process_limit_connection_rate |
|
|
| haproxy_process_max_connection_rate |
|
|
| haproxy_process_current_session_rate |
|
|
| haproxy_process_limit_session_rate |
|
|
| haproxy_process_max_session_rate |
|
|
| haproxy_process_current_ssl_rate |
|
|
| haproxy_process_limit_ssl_rate |
|
|
| haproxy_process_max_ssl_rate |
|
|
| haproxy_process_current_frontend_ssl_key_rate |
|
|
| haproxy_process_max_frontend_ssl_key_rate |
|
|
| haproxy_process_frontend_ssl_reuse |
|
|
| haproxy_process_current_backend_ssl_key_rate |
|
|
| haproxy_process_max_backend_ssl_key_rate |
|
|
| haproxy_process_ssl_cache_lookups_total |
|
|
| haproxy_process_ssl_cache_misses_total |
|
|
| haproxy_process_http_comp_bytes_in_total |
|
|
| haproxy_process_http_comp_bytes_out_total |
|
|
| haproxy_process_limit_http_comp |
|
|
| haproxy_process_current_zlib_memory |
|
|
| haproxy_process_max_zlib_memory |
|
|
| haproxy_process_current_tasks |
|
|
| haproxy_process_current_run_queue |
|
|
| haproxy_process_idle_time_percent |
|
|
| haproxy_process_stopping |
|
|
| haproxy_process_jobs |
|
|
| haproxy_process_unstoppable_jobs |
|
|
| haproxy_process_listeners |
|
|
| haproxy_process_active_peers |
|
|
| haproxy_process_connected_peers |
|
|
| haproxy_process_dropped_logs_total |
|
|
| haproxy_process_busy_polling_enabled |
|
|
| haproxy_process_failed_resolutions |
|
|
| haproxy_process_bytes_out_total |
|
|
| haproxy_process_spliced_bytes_out_total |
|
|
| haproxy_process_bytes_out_rate |
|
|
| haproxy_process_recv_logs_total |
|
|
| haproxy_process_build_info |
|
|
| haproxy_process_max_memory_bytes |
|
|
| haproxy_process_pool_allocated_bytes |
|
|
| haproxy_process_pool_used_bytes |
|
|
| haproxy_process_start_time_seconds |
|
|
+------------------------------------------------+
|
|
|
|
* Frontend metrics
|
|
|
|
+-------------------------------------------------+
|
|
| Metric name |
|
|
+-------------------------------------------------+
|
|
| haproxy_frontend_current_sessions |
|
|
| haproxy_frontend_max_sessions |
|
|
| haproxy_frontend_limit_sessions |
|
|
| haproxy_frontend_sessions_total |
|
|
| haproxy_frontend_bytes_in_total |
|
|
| haproxy_frontend_bytes_out_total |
|
|
| haproxy_frontend_requests_denied_total |
|
|
| haproxy_frontend_responses_denied_total |
|
|
| haproxy_frontend_request_errors_total |
|
|
| haproxy_frontend_status |
|
|
| haproxy_frontend_limit_session_rate |
|
|
| haproxy_frontend_max_session_rate |
|
|
| haproxy_frontend_http_responses_total |
|
|
| haproxy_frontend_http_requests_rate_max |
|
|
| haproxy_frontend_http_requests_total |
|
|
| haproxy_frontend_http_comp_bytes_in_total |
|
|
| haproxy_frontend_http_comp_bytes_out_total |
|
|
| haproxy_frontend_http_comp_bytes_bypassed_total |
|
|
| haproxy_frontend_http_comp_responses_total |
|
|
| haproxy_frontend_connections_rate_max |
|
|
| haproxy_frontend_connections_total |
|
|
| haproxy_frontend_intercepted_requests_total |
|
|
| haproxy_frontend_denied_connections_total |
|
|
| haproxy_frontend_denied_sessions_total |
|
|
| haproxy_frontend_failed_header_rewriting_total |
|
|
| haproxy_frontend_http_cache_lookups_total |
|
|
| haproxy_frontend_http_cache_hits_total |
|
|
| haproxy_frontend_internal_errors_total |
|
|
+-------------------------------------------------+
|
|
|
|
* Backend metrics
|
|
|
|
+-----------------------------------------------------+
|
|
| Metric name |
|
|
+-----------------------------------------------------+
|
|
| haproxy_backend_current_queue |
|
|
| haproxy_backend_max_queue |
|
|
| haproxy_backend_current_sessions |
|
|
| haproxy_backend_max_sessions |
|
|
| haproxy_backend_limit_sessions |
|
|
| haproxy_backend_sessions_total |
|
|
| haproxy_backend_bytes_in_total |
|
|
| haproxy_backend_bytes_out_total |
|
|
| haproxy_backend_requests_denied_total |
|
|
| haproxy_backend_responses_denied_total |
|
|
| haproxy_backend_connection_errors_total |
|
|
| haproxy_backend_response_errors_total |
|
|
| haproxy_backend_retry_warnings_total |
|
|
| haproxy_backend_redispatch_warnings_total |
|
|
| haproxy_backend_status |
|
|
| haproxy_backend_weight |
|
|
| haproxy_backend_active_servers |
|
|
| haproxy_backend_backup_servers |
|
|
| haproxy_backend_check_up_down_total |
|
|
| haproxy_backend_check_last_change_seconds |
|
|
| haproxy_backend_downtime_seconds_total |
|
|
| haproxy_backend_loadbalanced_total |
|
|
| haproxy_backend_max_session_rate |
|
|
| haproxy_backend_http_responses_total |
|
|
| haproxy_backend_http_requests_total |
|
|
| haproxy_backend_client_aborts_total |
|
|
| haproxy_backend_server_aborts_total |
|
|
| haproxy_backend_http_comp_bytes_in_total |
|
|
| haproxy_backend_http_comp_bytes_out_total |
|
|
| haproxy_backend_http_comp_bytes_bypassed_total |
|
|
| haproxy_backend_http_comp_responses_total |
|
|
| haproxy_backend_last_session_seconds |
|
|
| haproxy_backend_queue_time_average_seconds |
|
|
| haproxy_backend_connect_time_average_seconds |
|
|
| haproxy_backend_response_time_average_seconds |
|
|
| haproxy_backend_total_time_average_seconds |
|
|
| haproxy_backend_failed_header_rewriting_total |
|
|
| haproxy_backend_connection_attempts_total |
|
|
| haproxy_backend_connection_reuses_total |
|
|
| haproxy_backend_http_cache_lookups_total |
|
|
| haproxy_backend_http_cache_hits_total |
|
|
| haproxy_backend_max_queue_time_seconds |
|
|
| haproxy_backend_max_connect_time_seconds |
|
|
| haproxy_backend_max_response_time_seconds |
|
|
| haproxy_backend_max_total_time_seconds |
|
|
| haproxy_backend_internal_errors_total |
|
|
| haproxy_backend_uweight |
|
|
+-----------------------------------------------------+
|
|
|
|
* Server metrics
|
|
|
|
+----------------------------------------------------+
|
|
| Metric name |
|
|
+----------------------------------------------------+
|
|
| haproxy_server_current_queue |
|
|
| haproxy_server_max_queue |
|
|
| haproxy_server_current_sessions |
|
|
| haproxy_server_max_sessions |
|
|
| haproxy_server_limit_sessions |
|
|
| haproxy_server_sessions_total |
|
|
| haproxy_server_bytes_in_total |
|
|
| haproxy_server_bytes_out_total |
|
|
| haproxy_server_responses_denied_total |
|
|
| haproxy_server_connection_errors_total |
|
|
| haproxy_server_response_errors_total |
|
|
| haproxy_server_retry_warnings_total |
|
|
| haproxy_server_redispatch_warnings_total |
|
|
| haproxy_server_status |
|
|
| haproxy_server_weight |
|
|
| haproxy_server_check_failures_total |
|
|
| haproxy_server_check_up_down_total |
|
|
| haproxy_server_check_last_change_seconds |
|
|
| haproxy_server_downtime_seconds_total |
|
|
| haproxy_server_queue_limit |
|
|
| haproxy_server_current_throttle |
|
|
| haproxy_server_loadbalanced_total |
|
|
| haproxy_server_max_session_rate |
|
|
| haproxy_server_check_status |
|
|
| haproxy_server_check_code |
|
|
| haproxy_server_check_duration_seconds |
|
|
| haproxy_server_http_responses_total |
|
|
| haproxy_server_client_aborts_total |
|
|
| haproxy_server_server_aborts_total |
|
|
| haproxy_server_last_session_seconds |
|
|
| haproxy_server_queue_time_average_seconds |
|
|
| haproxy_server_connect_time_average_seconds |
|
|
| haproxy_server_response_time_average_seconds |
|
|
| haproxy_server_total_time_average_seconds |
|
|
| haproxy_server_failed_header_rewriting_total |
|
|
| haproxy_server_connection_attempts_total |
|
|
| haproxy_server_connection_reuses_total |
|
|
| haproxy_server_idle_connections_current |
|
|
| haproxy_server_idle_connections_limit |
|
|
| haproxy_server_max_queue_time_seconds |
|
|
| haproxy_server_max_connect_time_seconds |
|
|
| haproxy_server_max_response_time_seconds |
|
|
| haproxy_server_max_total_time_seconds |
|
|
| haproxy_server_internal_errors_total |
|
|
| haproxy_server_unsafe_idle_connections_current |
|
|
| haproxy_server_safe_idle_connections_current |
|
|
| haproxy_server_used_connections_current |
|
|
| haproxy_server_need_connections_current |
|
|
| haproxy_server_uweight |
|
|
+----------------------------------------------------+
|
|
|
|
* Stick table metrics
|
|
|
|
+----------------------------------------------------+
|
|
| Metric name |
|
|
+----------------------------------------------------+
|
|
| haproxy_sticktable_size |
|
|
| haproxy_sticktable_used |
|
|
+----------------------------------------------------+
|