Module ngx_http_status_module
The ngx_http_status_module module provides access to various status information.
This module is available as part of our commercial subscription.
Example Configuration
http {
upstream backend {
zone http_backend 64k;
server backend1.example.com weight=5;
server backend2.example.com;
}
proxy_cache_path /data/nginx/cache_backend keys_zone=cache_backend:10m;
server {
server_name backend.example.com;
location / {
proxy_pass http://backend;
proxy_cache cache_backend;
health_check;
}
status_zone server_backend;
}
server {
listen 127.0.0.1;
location /upstream_conf {
upstream_conf;
}
location /status {
status;
}
location = /status.html {
}
}
}
stream {
upstream backend {
zone stream_backend 64k;
server backend1.example.com:12345 weight=5;
server backend2.example.com:12345;
}
server {
listen 127.0.0.1:12345;
proxy_pass backend;
status_zone server_backend;
health_check;
}
}
Examples of status requests with this configuration:
http://127.0.0.1/status
http://127.0.0.1/status/nginx_version
http://127.0.0.1/status/caches/cache_backend
http://127.0.0.1/status/upstreams
http://127.0.0.1/status/upstreams/backend
http://127.0.0.1/status/upstreams/backend/peers/1
http://127.0.0.1/status/upstreams/backend/peers/1/weight
http://127.0.0.1/status/stream
http://127.0.0.1/status/stream/upstreams
http://127.0.0.1/status/stream/upstreams/backend
http://127.0.0.1/status/stream/upstreams/backend/peers/1
http://127.0.0.1/status/stream/upstreams/backend/peers/1/weight
The simple monitoring page is shipped with this distribution, accessible as “/status.html” in the default configuration. It requires the locations “/status” and “/status.html” to be configured as shown above.
Directives
| Syntax: | status;
|
| Default: | — |
| Context: | location
|
The status information will be accessible from the surrounding location. Access to this location should be limited.
By default, status information is output in the JSON format.
Alternatively, data may be output as JSONP. The callback parameter specifies the name of a callback function. The value can contain variables. If parameter is omitted, or the computed value is an empty string, then “ngx_status_jsonp_callback” is used.
| Syntax: | status_zone zone;
|
| Default: | — |
| Context: | server
|
Enables collection of virtual http or stream (1.7.11) server status information in the specified zone. Several servers may share the same zone.
Data
The following status information is provided:
version- Version of the provided data set. The current version is 8.
nginx_version- Version of nginx.
nginx_build- Name of nginx build.
address- The address of the server that accepted status request.
generation- The total number of configuration reloads.
load_timestamp- Time of the last reload of configuration, in milliseconds since Epoch.
timestamp- Current time in milliseconds since Epoch.
pid- The ID of the worker process that handled status request.
ppid- The ID of the master process that started the worker process.
processes-
respawned- The total number of abnormally terminated and respawned child processes.
connections-
accepted- The total number of accepted client connections.
dropped- The total number of dropped client connections.
active- The current number of active client connections.
idle- The current number of idle client connections.
ssl-
handshakes- The total number of successful SSL handshakes.
handshakes_failed- The total number of failed SSL handshakes.
session_reuses- The total number of session reuses during SSL handshake.
requests-
total- The total number of client requests.
current- The current number of client requests.
server_zones- For each status_zone:
processing- The number of client requests that are currently being processed.
requests- The total number of client requests received from clients.
responses-
total- The total number of responses sent to clients.
-
1xx, 2xx, 3xx, 4xx, 5xx - The number of responses with status codes 1xx, 2xx, 3xx, 4xx, and 5xx.
discarded- The total number of requests completed without sending a response.
received- The total number of bytes received from clients.
sent- The total number of bytes sent to clients.
slabs- For each shared memory zone that uses slab allocator:
pages-
used- The current number of used memory pages.
free- The current number of free memory pages.
slots- For each memory slot size (8, 16, 32, 64, 128, etc.) the following data are provided:
used- The current number of used memory slots.
free- The current number of free memory slots.
reqs- The total number of attempts to allocate memory of specified size.
fails- The number of unsuccessful attempts to allocate memory of specified size.
upstreams- For each dynamically configurable group, the following data are provided:
peers- For each server, the following data are provided:
id- The ID of the server.
server- An address of the server.
name- The name of the server specified in the server directive.
service- The service parameter value of the server directive.
backup- A boolean value indicating whether the server is a backup server.
weight- Weight of the server.
state- Current state, which may be one of “
up”, “draining”, “down”, “unavail”, “checking”, or “unhealthy”. active- The current number of active connections.
max_conns- The max_conns limit for the server.
requests- The total number of client requests forwarded to this server.
responses-
total- The total number of responses obtained from this server.
-
1xx, 2xx, 3xx, 4xx, 5xx - The number of responses with status codes 1xx, 2xx, 3xx, 4xx, and 5xx.
sent- The total number of bytes sent to this server.
received- The total number of bytes received from this server.
fails- The total number of unsuccessful attempts to communicate with the server.
unavail- How many times the server became unavailable for client requests (state “
unavail”) due to the number of unsuccessful attempts reaching the max_fails threshold. health_checks-
checks- The total number of health check requests made.
fails- The number of failed health checks.
unhealthy- How many times the server became unhealthy (state “
unhealthy”). last_passed- Boolean indicating if the last health check request was successful and passed tests.
downtime- Total time the server was in the “
unavail”, “checking”, and “unhealthy” states. downstart- The time (in milliseconds since Epoch) when the server became “
unavail”, “checking”, or “unhealthy”. selected- The time (in milliseconds since Epoch) when the server was last selected to process a request (1.7.5).
- The average time to get the response header from the server (1.7.10). The field is available when using the least_time load balancing method.
response_time- The average time to get the full response from the server (1.7.10). The field is available when using the least_time load balancing method.
keepalive- The current number of idle keepalive connections.
zombies- The current number of servers removed from the group but still processing active client requests.
zone- The name of the shared memory zone that keeps the group’s configuration and run-time state.
queue- For the requests queue, the following data are provided:
size- The current number of requests in the queue.
max_size- The maximum number of requests that can be in the queue at the same time.
overflows- The total number of requests rejected due to the queue overflow.
caches- For each cache (configured by proxy_cache_path and the likes):
size- The current size of the cache.
max_size- The limit on the maximum size of the cache specified in the configuration.
cold- A boolean value indicating whether the “cache loader” process is still loading data from disk into the cache.
-
hit, stale, updating, revalidated -
responses- The total number of responses read from the cache (hits, or stale responses due to proxy_cache_use_stale and the likes).
bytes- The total number of bytes read from the cache.
-
miss, expired, bypass -
responses- The total number of responses not taken from the cache (misses, expires, or bypasses due to proxy_cache_bypass and the likes).
bytes- The total number of bytes read from the proxied server.
responses_written- The total number of responses written to the cache.
bytes_written- The total number of bytes written to the cache.
stream-
server_zones- For each status_zone:
processing- The number of client connections that are currently being processed.
connections- The total number of connections accepted from clients.
sessions-
total- The total number of completed client sessions.
-
2xx, 4xx, 5xx - The number of sessions completed with status codes 2xx, 4xx, or 5xx.
discarded- The total number of connections completed without creating a session.
received- The total number of bytes received from clients.
sent- The total number of bytes sent to clients.
upstreams- For each dynamically configurable group, the following data are provided:
peers- For each server the following data are provided:
id- The ID of the server.
server- An address of the server.
name- The name of the server specified in the server directive.
service- The service parameter value of the server directive.
backup- A boolean value indicating whether the server is a backup server.
weight- Weight of the server.
state- Current state, which may be one of “
up”, “down”, “unavail”, “checking”, or “unhealthy”. active- The current number of connections.
connections- The total number of client connections forwarded to this server.
connect_time- The average time to connect to the upstream server. The field is available when using the least_time load balancing method.
first_byte_time- The average time to receive the first byte of data. The field is available when using the least_time load balancing method.
response_time- The average time to receive the last byte of data. The field is available when using the least_time load balancing method.
sent- The total number of bytes sent to this server.
received- The total number of bytes received from this server.
fails- The total number of unsuccessful attempts to communicate with the server.
unavail- How many times the server became unavailable for client connections (state “
unavail”) due to the number of unsuccessful attempts reaching the max_fails threshold. health_checks-
checks- The total number of health check requests made.
fails- The number of failed health checks.
unhealthy- How many times the server became unhealthy (state “
unhealthy”). last_passed- Boolean indicating if the last health check request was successful and passed tests.
downtime- Total time the server was in the “
unavail”, “checking”, and “unhealthy” states. downstart- The time (in milliseconds since Epoch) when the server became “
unavail”, “checking”, or “unhealthy”. selected- The time (in milliseconds since Epoch) when the server was last selected to process a connection.
zombies- The current number of servers removed from the group but still processing active client connections.
zone- The name of the shared memory zone that keeps the group’s configuration and run-time state.
Compatibility