Overview
This is a memo on how to turn off logging when the User-Agent ($http_user_agent) of an ELB health check is ELB-HealthChecker.
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| http {
...
map $http_user_agent $loggable {
~ELB-HealthChecker 0;
default 1;
}
access_log /var/log/nginx/access.log ltsv if=$loggable;
}
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You can specify a condition with the if parameter of access_log to toggle access log output on and off.
Configuration Example
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| http {
...
# access log を ltsv 形式にする
log_format ltsv 'domain:$host\t'
'host:$remote_addr\t'
'user:$remote_user\t'
'time:$time_local\t'
'method:$request_method\t'
'path:$request_uri\t'
'protocol:$server_protocol\t'
'status:$status\t'
'size:$body_bytes_sent\t'
'referer:$http_referer\t'
'agent:$http_user_agent\t'
'response_time:$request_time\t'
'cookie:$http_cookie\t'
'set_cookie:$sent_http_set_cookie\t'
'upstream_addr:$upstream_addr\t'
'upstream_cache_status:$upstream_cache_status\t'
'upstream_response_time:$upstream_response_time';
map $http_user_agent $loggable {
~ELB-HealthChecker 0;
default 1;
}
access_log /var/log/nginx/access.log ltsv if=$loggable;
include /etc/nginx/conf/conf.d/*.conf;
}
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| server {
listen 80;
listen [::]:80;
# ELB のヘルスチェッカーの場合、 200 を返す
if ($http_user_agent ~* ELB-HealthChecker) {
return 200;
}
...
}
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That’s all.
I hope this helps.
