Failed to start The nginx HTTP and reverse proxy server on RedHat EC2 Linux

 I needed a simple reverse proxy to redirect connections to a RDS database in a private subnet, so I quickly created a Redhat Linux EC2 instance, installed NGINX, and setup the nginx.conf file for session redirection. My nginx.conf looked like following:

user nginx;

worker_processes auto;

error_log /var/log/nginx/error.log;

pid /run/nginx.pid;

include /usr/share/nginx/modules/*.conf;

events {

    worker_connections 1024;

}

stream {

    upstream target_server {

        server targetdb:1521;

    }

    server {

        listen 1521;

        proxy_pass target_server; }

}

But starting ngnix process was giving following error:

[root@test nginx]# systemctl start 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@test nginx]# systemctl status nginx.service

● nginx.service - The nginx HTTP and reverse proxy server

   Loaded: loaded (/usr/lib/systemd/system/nginx.service; enabled; vendor preset: disabled)

   Active: failed (Result: exit-code) since Wed 2021-10-20 13:40:57 AEDT; 5s ago

  Process: 14702 ExecStartPre=/usr/sbin/nginx -t (code=exited, status=1/FAILURE)

  Process: 14700 ExecStartPre=/usr/bin/rm -f /run/nginx.pid (code=exited, status=0/SUCCESS)

Oct 20 13:40:57 test systemd[1]: Starting The nginx HTTP and reverse proxy server...

Oct 20 13:40:57 test nginx[14702]: nginx: [emerg] unknown directive "stream" in /etc/nginx/nginx.conf:9

Oct 20 13:40:57 test nginx[14702]: nginx: configuration file /etc/nginx/nginx.conf test failed

Oct 20 13:40:57 test systemd[1]: nginx.service: control process exited, code=exited status=1

Oct 20 13:40:57 test systemd[1]: Failed to start The nginx HTTP and reverse proxy server.

Oct 20 13:40:57 test systemd[1]: Unit nginx.service entered failed state.

Oct 20 13:40:57 test systemd[1]: nginx.service failed.

Solution: Just install nginx-mod-stream

[root@test nginx]# ls -ltr /usr/lib/nginx/modules/ngx_stream_module.so

ls: cannot access /usr/lib/nginx/modules/ngx_stream_module.so: No such file or directory

[root@ip-10-219-40-147 nginx]# yum install nginx-mod-stream

Now if you start nginx service, it should work.