急！！！问个关于503错误的问题

其徐如林

用五台服务器，做nginx+apache+tomcat的负载均衡

直接访问apache+tomcat是没有问题的

如果通过nginx访问apache，先正常显示网页，再刷新，就会报503错误：

Service Temporarily Unavailable
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later

查看apache的mod_jk.log，有如下报错：

[Tue Aug 03 11:11:44.180 2010] [12590:3074266688] [info] get_most_suitable_worker::jk_lb_worker.c (985): all workers are in error state for session C4102318967946B15F63858D09F2022C.worker4
[Tue Aug 03 11:11:44.180 2010] [12590:3074266688] [info] service::jk_lb_worker.c (144: All tomcat instances failed, no more workers left for recovery (attempt=0, retry=0)
[Tue Aug 03 11:11:44.180 2010] [12590:3074266688] [info] get_most_suitable_worker::jk_lb_worker.c (985): all workers are in error state for session C4102318967946B15F63858D09F2022C.worker4
[Tue Aug 03 11:11:44.180 2010] [12590:3074266688] [info] service::jk_lb_worker.c (1457): All tomcat instances failed, no more workers left (attempt=1, retry=0)
[Tue Aug 03 11:11:44.279 2010] [12590:3074266688] [info] get_most_suitable_worker::jk_lb_worker.c (985): all workers are in error state for session C4102318967946B15F63858D09F2022C.worker4
[Tue Aug 03 11:11:44.279 2010] [12590:3074266688] [info] service::jk_lb_worker.c (1457): All tomcat instances failed, no more workers left (attempt=0, retry=1)
[Tue Aug 03 11:11:44.279 2010] [12590:3074266688] [info] get_most_suitable_worker::jk_lb_worker.c (985): all workers are in error state for session C4102318967946B15F63858D09F2022C.worker4
[Tue Aug 03 11:11:44.279 2010] [12590:3074266688] [info] service::jk_lb_worker.c (1457): All tomcat instances failed, no more workers left (attempt=1, retry=1)

问下各位大侠，是不是哪里配置有问题啊？

其徐如林

贴下我的workers.properties配置：
worker.list=worker1,worker2,loadbalancer,status
#Define a ‘local_worker’ worker using ajp13
worker.worker1.port=8009
worker.worker1.host=192.168.10.160
worker.worker1.type=ajp13
worker.worker1.lbfactor=1
worker.worker1.socket_keepalive=1
worker.worker1.socket_timeout=0
worker.worker1.retries=3

#Define another ‘local_worker’ worker using ajp13
worker.worker2.port=8009
worker.worker2.host=192.168.10.161
worker.worker2.type=ajp13
worker.worker2.lbfactor=1
worker.worker2.socket_keepalive=1
worker.worker2.socket_timeout=0
worker.worker2.retries=3

#Define the LB worker
worker.loadbalancer.type=lb
worker.loadbalancer.balanced_workers=worker1,worker2
worker.loadbalancer.local_worker_only=1
worker.loadbalancer.sticky_session=true
worker.loadbalancer.sticky_session_force=true

# Status worker for managing load balancer
worker.status.type=status