Nginx: Unknown log format error
I have a proxy set up that is taking UDP traffic to load balance internal DNS. It is routing the traffic properly to my backend DNS servers, but I cannot seem to get the log formatting to work correctly.
The error I'm receiving is:
nginx[32103]: nginx: [emerg] unknown log format "dns" in /etc/nginx/nginx.conf:23
I have the log format in the http block, and define it in the stream-->server
block. I tried to set the log_format within the stream-->server
block, but none of the variables would work.
user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;
events {
worker_connections 768;
# multi_accept on;
}
stream {
upstream dns_servers {
least_conn;
server 192.168.3.222:53 fail_timeout=10s;
server 192.168.70.80:53 fail_timeout=10s;
server 192.168.70.81:53 fail_timeout=10s;
}
server {
listen 53 udp;
proxy_pass dns_servers;
proxy_responses 1;
proxy_timeout 1s;
access_log /var/log/nginx/access.log dns;
}
}
http {
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
include /etc/nginx/mime.types;
default_type application/octet-stream;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
ssl_prefer_server_ciphers on;
log_format dns '[$time_local] | $remote_addr | $remote_user | $server_name $host to: $upstream_addr | '
'"$request" | $status | upstream_response_time $upstream_response_time msec '
'$msec | request_time $request_time';
access_log /var/log/nginx/access.log dns;
error_log /var/log/nginx/error.log;
}
I tried to place log_format
in the stream block, but I start getting unknown <variable name> variable
.
user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;
events {
worker_connections 768;
# multi_accept on;
}
stream {
log_format dns '[$time_local] | $remote_addr | $remote_user | $server_name $host to: $upstream_addr | '
'"$request" | $status | upstream_response_time $upstream_response_time msec '
'$msec | request_time $request_time';
upstream dns_servers {
least_conn;
server 192.168.3.222:53 fail_timeout=10s;
server 192.168.70.80:53 fail_timeout=10s;
server 192.168.70.81:53 fail_timeout=10s;
}
server {
listen 53 udp;
proxy_pass dns_servers;
proxy_responses 1;
proxy_timeout 1s;
access_log /var/log/nginx/access.log dns;
}
}
This will not be a web server at all. It will only serve as a proxy for DNS traffic. How do I properly get the logging to function correctly? This is a default nginx.conf file except for the stream block.
Solution 1:
A log_format
for use by stream
server
s must be declared in the stream
block, rather than the http
block. These directives are independent of each other. See the documentation for the stream
log_format
.