【发布时间】：2020-08-25 12:08:32
【问题描述】：
我在 K8S 集群中有一个 Nginx Ingress Controller，它具有以下日志格式（我从容器中的 /etc/nginx/nginx.conf 获取）：
log_format upstreaminfo '$remote_addr - $remote_user [$time_local] "$request" $status $body_bytes_sent "$http_referer" "$http_user_agent" $request_length $request_time [$proxy_upstream_name] [$proxy_alternative_upstream_name] $upstream_addr $upstream_response_length $upstream_response_time $upstream_status $req_id';
我的目标是解析 Nginx 日志并将其推送到 CW。请注意，Nginx 日志文件包含 Nginx 应用程序日志（例如信息和警告日志）以及访问日志。我的理解是我必须使用 multi-formatter-parser 插件。所以我将 FluentD 配置如下（参见@nginx 过滤器的expression）：
<source>
@type tail
@id in_tail_container_logs
@label @containers
path /var/log/containers/*.log
exclude_path ["/var/log/containers/cloudwatch-agent*", "/var/log/containers/fluentd*", "/var/log/containers/nginx*"]
pos_file /var/log/fluentd-containers.log.pos
tag *
read_from_head true
<parse>
@type json
time_format %Y-%m-%dT%H:%M:%S.%NZ
</parse>
</source>
<source>
@type tail
@id in_tail_nginx_container_logs
@label @nginx
path /var/log/containers/nginx*.log
pos_file /var/log/fluentd-nginx.log.pos
tag *
read_from_head true
<parse>
@type json
time_format %Y-%m-%dT%H:%M:%S.%NZ
</parse>
</source>
<source>
@type tail
@id in_tail_cwagent_logs
@label @cwagentlogs
path /var/log/containers/cloudwatch-agent*
pos_file /var/log/cloudwatch-agent.log.pos
tag *
read_from_head true
<parse>
@type json
time_format %Y-%m-%dT%H:%M:%S.%NZ
</parse>
</source>
<label @containers>
<filter **>
@type parser
key_name log
format json
reserve_data true
</filter>
<filter **>
@type kubernetes_metadata
@id filter_kube_metadata
</filter>
<filter **>
@type record_transformer
@id filter_containers_stream_transformer
<record>
stream_name ${tag_parts[3]}
</record>
</filter>
<filter **>
@type concat
key log
multiline_start_regexp /^\S/
separator ""
flush_interval 5
timeout_label @NORMAL
</filter>
<match **>
@type relabel
@label @NORMAL
</match>
</label>
<label @nginx>
<filter **>
@type kubernetes_metadata
@id filter_nginx_kube_metadata
</filter>
<filter **>
@type record_transformer
@id filter_nginx_containers_stream_transformer
<record>
stream_name ${tag_parts[3]}
</record>
</filter>
<filter **>
@type parser
key_name log
<parse>
@type multi_format
<pattern>
format regexp
expression /^(?<host>[^ ]*) (?<domain>[^ ]*) \[(?<x_forwarded_for>[^\]]*)\] (?<server_port>[^ ]*) - (?<user>[^ ]*) \[(?<time>[^\]]*)\] "(?<method>\S+[^\"])(?: +(?<path>[^\"]*?)(?: +\S*)?)?" (?<code>[^ ]*) (?<size>[^ ]*)(?: "(?<referer>[^\"]*)" "(?<agent>[^\"]*)")? (?<request_length>[^ ]*) (?<request_time>[^ ]*) (?:\[(?<proxy_upstream_name>[^\]]*)\] )?(?:\[(?<proxy_alternative_upstream_name>[^\]]*)\] )?(?<upstream_addr>[^ ]*) (?<upstream_response_length>[^ ]*) (?<upstream_response_time>[^ ]*) (?<upstream_status>[^ ]*) (?<request_id>[^ ]*)\n$/
</pattern>
</parse>
</filter>
<match **>
@type relabel
@label @NORMAL
</match>
</label>
<label @cwagentlogs>
<filter **>
@type kubernetes_metadata
@id filter_kube_metadata_cwagent
</filter>
<filter **>
@type record_transformer
@id filter_cwagent_stream_transformer
<record>
stream_name ${tag_parts[3]}
</record>
</filter>
<filter **>
@type concat
key log
multiline_start_regexp /^\d{4}[-/]\d{1,2}[-/]\d{1,2}/
separator ""
flush_interval 5
timeout_label @NORMAL
</filter>
<match **>
@type relabel
@label @NORMAL
</match>
</label>
<label @NORMAL>
<match **>
@type cloudwatch_logs
@id out_cloudwatch_logs_containers
region "#{ENV.fetch('REGION')}"
log_group_name "/aws/containerinsights/#{ENV.fetch('CLUSTER_NAME')}/application"
log_stream_name_key stream_name
remove_log_stream_name_key true
auto_create_stream true
<buffer>
flush_interval 5
chunk_limit_size 2m
queued_chunks_limit_size 32
retry_forever true
</buffer>
</match>
</label>
现在我看到以下日志的解析器错误：
...#0 dump an error event: error_class=Fluent::Plugin::Parser::ParserError error_class=Fluent::Plugin::Parser::ParserError error="pattern not matched with data '10.0.1.2 - - [25/Aug/2020:11:43:09 +0000] \"GET /favicon.ico HTTP/1.1\" 499 0 \"-\" \"Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:79.0) Gecko/ Firefox/79.0\" 901 0.000 [develop-api-8080] [] 10.0.2.3:8080 0 0.000 - 3a3d3bbd02a633aaaab2af3b5284a0c9\n'"
..."log"=>"10.0.1.2 - - [25/Aug/2020:11:43:09 +0000] \"GET /favicon.ico HTTP/1.1\" 499 0 \"-\" \"Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:79.0) Gecko/20100101 Firefox/79.0\" 901 0.000 [develop-api-8080] [] 10.0.2.3:8080 0 0.000 - 3a3d3bbd02a633aaaab2af3b5284a0c9\n"
我不确定问题出在我的正则表达式还是配置的其他部分。 （请注意，我还没有为 Nginx 应用程序日志添加解析器！）。谢谢。
【问题讨论】：
标签： regex nginx nginx-ingress fluentd