Nginx : Use Stream module2022/05/12 |
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Configure Nginx to use Stream module.
It's possible to proxy TCP, UDP (Nginx 1.9.13 and later for UDP), UNIX-domain sockets requests.
This example is based on the environment like follows to proxy MariaDB requests to backend servers.
-----------+---------------------------+-----
| |
|10.0.0.31 |
+----------+-----------+ |
| [ www.srv.world ] | |
| Nginx | |
+----------------------+ |
|
------------+--------------------------+-----------
| |
|10.0.0.51 |10.0.0.52
+-----------+----------+ +-----------+----------+
| [ node01.srv.world ] | | [ node02.srv.world ] |
| Mariadb#1 | | Mariadb#2 |
+----------------------+ +----------------------+
|
| [1] | Configure Nginx. |
|
[root@www ~]#
dnf -y install nginx-mod-stream
[root@www ~]#
vi /etc/nginx/nginx.conf # add to the end # [weight=*] means balancing weight
stream {
upstream mariadb-backend {
server 10.0.0.51:3306 weight=2;
server 10.0.0.52:3306;
}
server {
listen 3306;
proxy_pass mariadb-backend;
}
}
[root@www ~]# systemctl reload nginx |
| [2] | If SELinux is enabled, change policy. |
|
[root@www ~]# setsebool -P httpd_can_network_connect on [root@www ~]# setsebool -P httpd_can_network_connect_db on
[root@www ~]#
vi nginx-stream.te # create new
module nginx-stream 1.0;
require {
type mysqld_port_t;
type httpd_t;
class tcp_socket name_bind;
}
#============= httpd_t ==============
allow httpd_t mysqld_port_t:tcp_socket name_bind;
checkmodule -m -M -o nginx-stream.mod nginx-stream.te [root@www ~]# semodule_package --outfile nginx-stream.pp --module nginx-stream.mod [root@www ~]# semodule -i nginx-stream.pp |
| [3] | Verify it works fine to access to frontend Nginx server from any client computer. |
[cent@client ~]$ mysql -u serverworld -ppassword -h www.srv.world -e "show variables like 'hostname';" +---------------+------------------+ | Variable_name | Value | +---------------+------------------+ | hostname | node01.srv.world | +---------------+------------------+ [cent@client ~]$ mysql -u serverworld -ppassword -h www.srv.world -e "show variables like 'hostname';" +---------------+------------------+ | Variable_name | Value | +---------------+------------------+ | hostname | node01.srv.world | +---------------+------------------+ [cent@client ~]$ mysql -u serverworld -ppassword -h www.srv.world -e "show variables like 'hostname';" +---------------+------------------+ | Variable_name | Value | +---------------+------------------+ | hostname | node02.srv.world | +---------------+------------------+ [cent@client ~]$ mysql -u serverworld -ppassword -h www.srv.world -e "show variables like 'hostname';" +---------------+------------------+ | Variable_name | Value | +---------------+------------------+ | hostname | node01.srv.world | +---------------+------------------+ |
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