Nginx : Use Stream module2023/03/03 |
Configure Nginx to use Stream module.
It's possible to proxy TCP, UDP (1.9.13), 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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