Load Balancing TCP directive mail {}

[Thomas Ward]

That's a pretty self-explanatory error actually:

Jun 06 18:18:19 proxy-lb02.srvmail.ma.gov.br nginx[52777]: nginx: [emerg]
"stream" directive is not allowed here in
/etc/nginx/email/balanceador.conf:1

Your mail configuration file is imported inside a mail block.  That won't work.

Stream operates on the same level as an http or mail block - that is, it's not *part* of the mail{} block but instead its own stream block.  You would need to import the stream function directly at /etc/nginx/nginx.conf root level and NOT as part of the mail{} block.  Details on *that* are in the nginx documentation: http://nginx.org/en/docs/stream/ngx_stream_core_module.html#stream

Basically, you're trying to include the stream configuration at the wrong level - the stream{} block you are configuring needs to be at the nginx.conf base level and NOT as part of the mail{} block as your nginx.conf is trying to do.


Thomas

On 6/6/20 6:51 PM, andersonsserra wrote:
> Hi folks,
>
> I'm trying to do a round-robin load balancing for outgoing connections from
> my MTA servers. At first I tried it as follows:
>
> [root at proxy-lb02 email]# pwd
> /etc/nginx/email
> [root at proxy-lb02 email]# cat balanceador.conf
> stream {
>         upstream stream_backend_mail {
>                 least_conn;
>                 server mta-01.srvmail.com.br:26  max_fails=2
> fail_timeout=15s;
>                 server mta-02.srvmail.com.br:26  max_fails=2
> fail_timeout=15s;
>                 server mta-03.srvmail.com.br:26  max_fails=2
> fail_timeout=15s;
>                 server mta-04.srvmail.com.br:26  max_fails=2
> fail_timeout=15s;
>                 server mta-05.srvmail.com.br:26  max_fails=2
> fail_timeout=15s;
>                 }
>
>
>         server {
>         listen     0.0.0.0:25;
>         proxy_pass stream_backend_mail;
>         }
> }
>
> [root at proxy-lb02 nginx]# pwd
> /etc/nginx
> [root at proxy-lb02 nginx]# cat nginx.conf
>
> user  nginx;
> worker_processes  1;
>
> error_log  /var/log/nginx/error.log warn;
> pid        /var/run/nginx.pid;
>
>
> events {
>     worker_connections  1024;
> }
>
>
> http {
>     include       /etc/nginx/mime.types;
>     default_type  application/octet-stream;
>
>     log_format  main  '$remote_addr - $remote_user [$time_local] "$request"
> '
>                       '$status $body_bytes_sent "$http_referer" '
>                       '"$http_user_agent" "$http_x_forwarded_for"';
>
>     access_log  /var/log/nginx/access.log  main;
>
>     sendfile        on;
>     #tcp_nopush     on;
>
>     keepalive_timeout  65;
>
>     #gzip  on;
>
>     include /etc/nginx/conf.d/*.conf;
>
>
>
>
> }
>
> mail {
>
>         include /etc/nginx/email/*.conf;
>
> }
>
>
> [root at proxy-lb02 nginx]# systemctl restart nginx
> Job for nginx.service failed because the control process exited with error
> code. See "systemctl status nginx.service" and "journalctl -xe" for
> details.
>
> [root at proxy-lb02 nginx]# systemctl status nginx -l
> ● nginx.service - nginx - high performance web server
>    Loaded: loaded (/usr/lib/systemd/system/nginx.service; enabled; vendor
> preset: disabled)
>    Active: failed (Result: exit-code) since Sáb 2020-06-06 18:18:19 EDT; 58s
> ago
>      Docs: http://nginx.org/en/docs/
>   Process: 51695 ExecStop=/bin/kill -s TERM $MAINPID (code=exited,
> status=0/SUCCESS)
>   Process: 52777 ExecStart=/usr/sbin/nginx -c /etc/nginx/nginx.conf
> (code=exited, status=1/FAILURE)
>  Main PID: 51686 (code=exited, status=0/SUCCESS)
>
> Jun 06 18:18:19 proxy-lb02.srvmail.ma.gov.br systemd[1]: Starting nginx -
> high performance web server...
> Jun 06 18:18:19 proxy-lb02.srvmail.ma.gov.br nginx[52777]: nginx: [emerg]
> "stream" directive is not allowed here in
> /etc/nginx/email/balanceador.conf:1
> Jun 06 18:18:19 proxy-lb02.srvmail.ma.gov.br systemd[1]: nginx.service:
> control process exited, code=exited status=1
> Jun 06 18:18:19 proxy-lb02.srvmail.ma.gov.br systemd[1]: Failed to start
> nginx - high performance web server.
> Jun 06 18:18:19 proxy-lb02.srvmail.ma.gov.br systemd[1]: Unit nginx.service
> entered failed state.
> Jun 06 18:18:19 proxy-lb02.srvmail.ma.gov.br systemd[1]: nginx.service
> failed.
>
>
> [root at proxy-lb02 nginx]# nginx -v
> nginx version: nginx/1.18.0
>
> Could someone help me find the solution to this error?
>
> Thanks.
>
> Anderson Serra
>
> Posted at Nginx Forum: https://forum.nginx.org/read.php?2,288282,288282#msg-288282
>
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