kong命令upstream
Posted jybky
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介绍
upstream 就是一个虚拟的服务。可用于配置多个target目标服务时实现负载均衡的效果。
注意:service的host指的就是upstream的name。
同时upstream提供了一个health check方法,用于检查target目标服务是否健康。以此控制启用或禁用target目标服务
和upstream关联的kong模块:service ,target
主要参数:algorithm 负载算法:round-robin(默认), consistent-hashing
, or least-connections
healthchecks.active.http_path 健康检查路径:默认/,该地址是指在目标服务器上,适用于目标服务器的所有请求
命令
1、add upstream
方法 post
api:/upstreams
2,list upstream ,retrieve upstream
方法:get
api:/upstreams
/upstreams/upstream id or name
/targets/{target host:port or id}/upstream 关联指定target目标服务的upstream
3,update upstream
方法:patch
api:/upstreams/{upstream name or id}
/targets/{target host:port or id}/upstream
4,create or update upstream
方法:put
api:/upstreams/{upstream name or id}
/targets/{target host:port or id}/upstream
5,delete
方法:delete
api:/upstreams/{upstream name or id}
/targets/{target host:port or id}/upstream
健康检查 health check
kong会发起对配置在upstream上的所有target进行健康检查,若检查失败,将会暂时移除不健康的target服务。
恢复之后会再次加入。具体参数可在upstream参数中配置。
检查结果主要为一下四大类(官网介绍)
- If a Target fails to be activated in the balancer due to DNS issues, its status displays as
DNS_ERROR
. - When health checks are not enabled in the Upstream configuration, the health status for active Targets is displayed as
HEALTHCHECKS_OFF
. - When health checks are enabled and the Target is determined to be healthy, either automatically or manually, its status is displayed as
HEALTHY
. This means that this Target is currently included in this Upstream’s load balancer execution. - When a Target has been disabled by either active or passive health checks (circuit breakers) or manually, its status is displayed as
UNHEALTHY
. The load balancer is not directing any traffic to this Target via this Upstream.
上述HEALTHY 、HEALTHCHECKS_OFF情况,target目标可以被转发请求,其他两类不被负载转发。
查看:get方法。api:/upstreams/{name or id}/health/
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