resty.healthcheckHealthcheck library for OpenResty.
-- - -
Some notes on the usage of this library:
+Some notes on the usage of this library:
Each target will have 4 counters, 1 success counter and 3 failure - counters ('http', 'tcp', and 'timeout'). Any failure will only reset the - success counter, but a success will reset all three failure counters.
All targets are uniquely identified by their IP address and port number - combination, most functions take those as arguments.
All keys in the SHM will be namespaced by the healthchecker name as
- provided to the new function. Hence no collissions will occur on shm-keys
- as long as the name is unique.
Active healthchecks will be synchronized across workers, such that only - a single active healthcheck runs.
Events will be raised in every worker, see lua-resty-worker-events - for details.
Each target will have 4 counters, 1 success counter and 3 failure +counters (‘http’, ‘tcp’, and ‘timeout’). Any failure will only reset the +success counter, but a success will reset all three failure counters.
All targets are uniquely identified by their IP address and port number +combination, most functions take those as arguments.
All keys in the SHM will be namespaced by the healthchecker name as
+provided to the new function. Hence no collissions will occur on shm-keys
+as long as the name is unique.
Active healthchecks will be synchronized across workers, such that only +a single active healthcheck runs.
Events will be raised in every worker, see lua-resty-worker-events +for details.
Acquire a lock and run a function
+Acquire a lock and run a function
The function call itself is wrapped with pcall to protect against exception.
@@ -189,11 +187,11 @@init_worker or log:
resty.lock does not
- attempt to sleep/yield"scheduled"resty.lock does not
+attempt to sleep/yield"scheduled"unhealthy.tcp_failures (for TCP failures) or unhealthy.http_failures
is set to zero in the configuration, this function is a no-op
and returns true.
@@ -477,7 +475,7 @@ healthy.successes is set to zero in the configuration,
this function is a no-op and returns true.
@@ -559,7 +557,7 @@ NOTE: the returned checker object must be anchored, if not it will be
- removed by Lua's garbage collector and the healthchecks will cease to run.
+ removed by Lua’s garbage collector and the healthchecks will cease to run.
name: name of the health checkershm_name: the name of the lua_shared_dict specified in the Nginx configuration to usechecks.active.type: "http", "https" or "tcp" (default is "http")ssl_cert: certificate for mTLS connections (string or parsed object)ssl_key: key for mTLS connections (string or parsed object)checks.active.timeout: socket timeout for active checks (in seconds)checks.active.concurrency: number of targets to check concurrentlychecks.active.http_path: path to use in GET HTTP request to run on active checkschecks.active.https_verify_certificate: boolean indicating whether to verify the HTTPS certificatechecks.active.headers: one or more lists of values indexed by header namechecks.active.healthy.interval: interval between checks for healthy targets (in seconds)checks.active.healthy.http_statuses: which HTTP statuses to consider a successchecks.active.healthy.successes: number of successes to consider a target healthychecks.active.unhealthy.interval: interval between checks for unhealthy targets (in seconds)checks.active.unhealthy.http_statuses: which HTTP statuses to consider a failurechecks.active.unhealthy.tcp_failures: number of TCP failures to consider a target unhealthychecks.active.unhealthy.timeouts: number of timeouts to consider a target unhealthychecks.active.unhealthy.http_failures: number of HTTP failures to consider a target unhealthychecks.passive.type: "http", "https" or "tcp" (default is "http"; for passive checks, "http" and "https" are equivalent)checks.passive.healthy.http_statuses: which HTTP statuses to consider a failurechecks.passive.healthy.successes: number of successes to consider a target healthychecks.passive.unhealthy.http_statuses: which HTTP statuses to consider a successchecks.passive.unhealthy.tcp_failures: number of TCP failures to consider a target unhealthychecks.passive.unhealthy.timeouts: number of timeouts to consider a target unhealthychecks.passive.unhealthy.http_failures: number of HTTP failures to consider a target unhealthyname: name of the health checkershm_name: the name of the lua_shared_dict specified in the Nginx configuration to usessl_cert: certificate for mTLS connections (string or parsed object)ssl_key: key for mTLS connections (string or parsed object)checks.active.type: “http”, “https” or “tcp” (default is “http”)checks.active.timeout: socket timeout for active checks (in seconds)checks.active.concurrency: number of targets to check concurrentlychecks.active.http_path: path to use in GET HTTP request to run on active checkschecks.active.https_sni: SNI server name incase of HTTPSchecks.active.https_verify_certificate: boolean indicating whether to verify the HTTPS certificatechecks.active.headers: one or more lists of values indexed by header namechecks.active.healthy.interval: interval between checks for healthy targets (in seconds)checks.active.healthy.http_statuses: which HTTP statuses to consider a successchecks.active.healthy.successes: number of successes to consider a target healthychecks.active.unhealthy.interval: interval between checks for unhealthy targets (in seconds)checks.active.unhealthy.http_statuses: which HTTP statuses to consider a failurechecks.active.unhealthy.tcp_failures: number of TCP failures to consider a target unhealthychecks.active.unhealthy.timeouts: number of timeouts to consider a target unhealthychecks.active.unhealthy.http_failures: number of HTTP failures to consider a target unhealthychecks.passive.type: “http”, “https” or “tcp” (default is “http”; for passive checks, “http” and “https” are equivalent)checks.passive.healthy.http_statuses: which HTTP statuses to consider a failurechecks.passive.healthy.successes: number of successes to consider a target healthychecks.passive.unhealthy.http_statuses: which HTTP statuses to consider a successchecks.passive.unhealthy.tcp_failures: number of TCP failures to consider a target unhealthychecks.passive.unhealthy.timeouts: number of timeouts to consider a target unhealthychecks.passive.unhealthy.http_failures: number of HTTP failures to consider a target unhealthy If any of the health counters above (e.g. checks.passive.unhealthy.timeouts)
is set to zero, the according category of checks is not taken to account.
This way active or passive health checks can be disabled selectively.
@@ -829,8 +829,8 @@