sweetpotatoman commented on issue #7026:
URL: https://github.com/apache/apisix/issues/7026#issuecomment-1124499372
> > When the log returns `no valid upstream node: nil`, we are not quite
sure what's wrong.
> > Why are we still unable to find upstream node with this configuration?
>
> Are there any other error logs? Or you can adjust the log level to debug
to get more logs.
>
> This is usually the case when APISIX is unable to query a valid message
from k8s.
the log level is `debug` in now.
```
...
nginx_config:
error_log_level: "debug"
...
```
log message
```
2022/05/12 03:37:55 [info] 43#43: *35664 [lua] radixtree.lua:564:
match_route_opts(): hosts match: true, client: 172.20.4.221, server: _,
request: "GET /explorer/graphiql HTTP/1.1", host: "xxx-api.xxx.io"
2022/05/12 03:37:55 [info] 43#43: *35664 [lua] init.lua:388:
http_access_phase(): matched route:
{"clean_handlers":{},"modifiedIndex":177,"createdIndex":176,"value":{"labels":{"app":"one"},"create_time":1652326626,"status":1,"name":"graphiql","priority":0,"uri":"\/explorer\/graphiql","desc":"123","methods":["GET","POST"],"upstream_id":"407087917031228312","host":"xxx-api.xxx.io","id":"407345815439279060","update_time":1652326641},"key":"\/apisix\/routes\/407345815439279060","orig_modifiedIndex":177,"update_count":0,"has_domain":false},
client: 172.20.4.221, server: _, request: "GET /explorer/graphiql HTTP/1.1",
host: "xxx-api.xxx.io"
2022/05/12 03:37:55 [info] 43#43: *35664 [lua] init.lua:305:
get_upstream_by_id(): parsed upstream:
{"clean_handlers":{},"createdIndex":79,"value":{"create_time":1652172906,"discovery_type":"kubernetes","update_time":1652241806,"service_name":"testnet\/explorer-reader:http-80","hash_on":"vars","scheme":"http","type":"roundrobin","pass_host":"pass","keepalive_pool":{"idle_timeout":60,"size":320,"requests":1000},"timeout":{"read":6,"send":6,"connect":6},"name":"explorer-reader","desc":"explorer-reader","id":"407087917031228312","parent":{"clean_handlers":"table:
0x7fdd4917e0b0","createdIndex":79,"value":"table:
0x7fdd4cad5c70","key":"\/apisix\/upstreams\/407087917031228312","modifiedIndex":162,"has_domain":false}},"key":"\/apisix\/upstreams\/407087917031228312","modifiedIndex":162,"has_domain":false},
client: 172.20.4.221, server: _, request: "GET /explorer/graphiql HTTP/1.1",
host: "xxx-api.xxx.io"
2022/05/12 03:37:55 [info] 43#43: *35664 [lua] init.lua:317: nodes(): get
empty endpoint version from discovery DICT testnet/explorer-reader, client:
172.20.4.221, server: _, request: "GET /explorer/graphiql HTTP/1.1", host:
"xxx-api.xxx.io"
2022/05/12 03:37:55 [error] 43#43: *35664 [lua] init.lua:512:
http_access_phase(): failed to set upstream: no valid upstream node: nil,
client: 172.20.4.221, server: _, request: "GET /explorer/graphiql HTTP/1.1",
host: "xxx-api.xxx.io"
2022/05/12 03:37:57 [info] 45#45: *37332 [lua] radixtree.lua:564:
match_route_opts(): hosts match: false, client: 172.20.29.104, server: _,
request: "GET / HTTP/1.1", host: "172.20.61.219:9080"
2022/05/12 03:37:57 [info] 45#45: *37332 [lua] init.lua:383:
http_access_phase(): not find any matched route, client: 172.20.29.104, server:
_, request: "GET / HTTP/1.1", host: "172.20.61.219:9080"
2022/05/12 03:37:57 [info] 46#46: *37336 [lua] radixtree.lua:564:
match_route_opts(): hosts match: false, client: 172.20.4.221, server: _,
request: "GET / HTTP/1.1", host: "172.20.61.219:9080"
2022/05/12 03:37:57 [info] 46#46: *37336 [lua] init.lua:383:
http_access_phase(): not find any matched route, client: 172.20.4.221, server:
_, request: "GET / HTTP/1.1", host: "172.20.61.219:9080"
172.20.4.221 - - [12/May/2022:03:37:55 +0000] xxx-api.xxx.io "GET
/explorer/graphiql HTTP/1.1" 503 596 0.000 "-" "Mozilla/5.0 (Macintosh; Intel
Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.54
Safari/537.36" - - - "http://xxx-api.xxx.io";
```
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