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1.istio-pilot日志级别
编辑istio-system.deployment.istio-pilot，修改args中–log_output_level=default:指定日志级别
2.istio-policy日志级别设置同istio-pilot
3.istio-proxy（envoy）日志级别设置
进入istio-proxy容器中，通过如下命令进行设置：
curl -X POST localhost:15000/logging?level=trace
4.istio-proxy access日志设置
官方参考：https://istio.io/docs/tasks/telemetry/logs/access-log/
修改istio-system.configMap.istio中的accessLogFile: “/dev/stdout”
修改后即可在istio-proxy看到如下accessLog（业务app pod容器无需重启）：
默认accessLogFormat：
通过如下命令查看accessLogFormat配置：
istioctl proxy-config listeners <your pod> -n <your namespace> -o json
[%START_TIME%] ”%REQ(:METHOD)% %REQ(X-ENVOY-ORIGINAL-PATH?:PATH)% %PROTOCOL%” %RESPONSE_CODE% %RESPONSE_FLAGS% ”%DYNAMIC_METADATA(istio.mixer:status)%” %BYTES_RECEIVED% %BYTES_SENT% %DURATION% %RESP(X-ENVOY-UPSTREAM-SERVICE-TIME)% ”%REQ(X-FORWARDED-FOR)%” ”%REQ(USER-AGENT)%” ”%REQ(X-REQUEST-ID)%” ”%REQ(:AUTHORITY)%” ”%UPSTREAM_HOST%” %UPSTREAM_CLUSTER% %UPSTREAM_LOCAL_ADDRESS% %DOWNSTREAM_LOCAL_ADDRESS% %DOWNSTREAM_REMOTE_ADDRESS% %REQUESTED_SERVER_NAME%n
实际日志与默认格式对比：
[2019-09-24T05:57:56.836Z] “POST /256/vendorRetire/list HTTP/1.1” 200 – “-” 113 6029 110 110 “-” “Apache-HttpClient/4.5.7 (Java/1.8.0_192)” “d17359bf-7b4c-4c44-8dab-003c59fa810b” “s267.tsp” “127.0.0.1:8080” inbound|80|http|s267.tsp.svc.cluster.local – 172.25.193.104:8080 172.25.123.74:33340 – ==================================================================================== [%START_TIME%] ”%REQ(:METHOD)% %REQ(X-ENVOY-ORIGINAL-PATH?:PATH)% %PROTOCOL%” %RESPONSE_CODE% %RESPONSE_FLAGS% ”%DYNAMIC_METADATA(istio.mixer:status)%” %BYTES_RECEIVED% %BYTES_SENT% %DURATION% %RESP(X-ENVOY-UPSTREAM-SERVICE-TIME)% ”%REQ(X-FORWARDED-FOR)%” ”%REQ(USER-AGENT)%” ”%REQ(X-REQUEST-ID)%” ”%REQ(:AUTHORITY)%” ”%UPSTREAM_HOST%” %UPSTREAM_CLUSTER% %UPSTREAM_LOCAL_ADDRESS% %DOWNSTREAM_LOCAL_ADDRESS% %DOWNSTREAM_REMOTE_ADDRESS% %REQUESTED_SERVER_NAME%n
Date MPP: method path protocol RFS: respCode respFlag metadataStaus RSDR: recvBytes sendBytes duration upStreamServiceTime FARA: x-forward-for user-agent x-request-id authority UCL: upstream-host upstream-cluster upstream-local-address DRS: downstream-localhocal-address downstream-remote-address requested-server-name(sni) 3-3-4-4-3-3
其中RESPONSE_FLAGS定义如下：
envoy log参考：
Envoy官方参考 – access_log#config-access-log-default-format
https://www.envoyproxy.io/docs/envoy/latest/configuration/observability/access_log/usage#configuration
stackoverflow – what-is-istio-proxy-access-log-mean
注：Isito 1.7以后最新默认访问日志格式如下：
[%START_TIME%] ”%REQ(:METHOD)% %REQ(X-ENVOY-ORIGINAL-PATH?:PATH)% %PROTOCOL%” %RESPONSE_CODE% %RESPONSE_FLAGS% %RESPONSE_CODE_DETAILS% %CONNECTION_TERMINATION_DETAILS% ”%UPSTREAM_TRANSPORT_FAILURE_REASON%” %BYTES_RECEIVED% %BYTES_SENT% %DURATION% %RESP(X-ENVOY-UPSTREAM-SERVICE-TIME)% ”%REQ(X-FORWARDED-FOR)%” ”%REQ(USER-AGENT)%” ”%REQ(X-REQUEST-ID)%” ”%REQ(:AUTHORITY)%” ”%UPSTREAM_HOST%” %UPSTREAM_CLUSTER% %UPSTREAM_LOCAL_ADDRESS% %DOWNSTREAM_LOCAL_ADDRESS% %DOWNSTREAM_REMOTE_ADDRESS% %REQUESTED_SERVER_NAME% %ROUTE_NAME%n
参考：ISTIO/DOCS/TASKS/OBSERVABILITY/LOGS/Getting Envoy’s Access Logs
其中关于downstream和upstream可参见下图：
5.Springboot Tomcat访问日志
开启如下配置：
server.tomcat.accesslog.enabled = true server.tomcat.accesslog.directory = /data/logs/tomcat
即可在应用容器中/data/logs/tomcat看到如下访问日志：
查看最近的access_log即可看到tomcat的访问日志：
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