Binding applications to a specific ip and port within Centos
LD_PRELOAD library to make bind and connect to use a virtual IP address as localaddress and a usable port as localport. Specified via the enviroment variable BIND\_ADDR/BIND_PORT.
Compile on Linux with:
make
How to use it:
BIND_ADDR="your ip" BIND_PORT="your port" LD_PRELOAD=/your_path/libindp.so the real command ...
Example in bash to make inetd only listen to the localhost lo interface, thus disabling remote connections and only enable to/from localhost:
BIND_ADDR="127.0.0.1" BIND_PORT="49888" LD_PRELOAD=/your_path/libindp.so curl http://192.168.190.128
OR:
BIND_ADDR="127.0.0.1" LD_PRELOAD=/your_path/libindp.so curl http://192.168.190.128
Just want to change the nginx's port:
BIND_PORT=8888 LD_PRELOAD=/your_path/libindp.so /usr/sbin/nginx -c /etc/nginx/nginx.conf
Example in bash to use your virtual IP as your outgoing sourceaddress for ircII:
BIND_ADDR="your-virt-ip" LD_PRELOAD=/your_path/bind.so ircII
Note that you have to set up your server's virtual IP first.
Now add the SO_REUSEPORT support within Centos7 or Linux OS with kernel >= 3.9, for the old applictions with multi-process just listen the same port now:
REUSE_PORT=1 LD_PRELOAD=./libbindp.so python server.py &
OR
REUSE_PORT=1 BIND_PORT=9999 LD_PRELOAD=./libbindp.so java -server -jar your.jar &
With libindp.so's support, you can run your app multi-instance just for you need.
The bindp just support single port applictions, if you want the professional version, please contact me(yongboy(AT)gmail.com).
Enjoy it :))