You need to run at least nginx version 1.11.8, with escape=json
support.
Add this to your nginx configuration file and restart the service:
log_format graylog2_json escape=json '{ "timestamp": "$time_iso8601", '
'"remote_addr": "$remote_addr", '
'"body_bytes_sent": $body_bytes_sent, '
'"request_time": $request_time, '
'"response_status": $status, '
'"request": "$request", '
'"request_method": "$request_method", '
'"host": "$host",'
'"upstream_cache_status": "$upstream_cache_status",'
'"upstream_addr": "$upstream_addr",'
'"http_x_forwarded_for": "$http_x_forwarded_for",'
'"http_referrer": "$http_referer", '
'"http_user_agent": "$http_user_agent" }';
# replace the hostnames with the IP or hostname of your Graylog2 server
access_log syslog:server=graylog.server.org:12304 graylog2_json;
error_log syslog:server=graylog.server.org:12305;