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HaProxy Socket

One can control HaProxy through socket. To enable admin level socket, set the following line in haproxy.cfg:

global
    stats socket /var/lib/haproxy/stats level admin

After that, use hatop to connect to socket.

List all available backend/nodes

for i in $(echo "show stat" | socat /var/lib/haproxy/stats stdio | egrep -v '^#|^$|mysql|(FRONT|BACK)END' | cut -d, -f1,2 | sed 's/,/\//'); do echo $i; done

Gracefuly removing a node

To gracefuly remove a node from a backend, run hatop:

hatop -s /var/lib/haproxy/stats

After you get hatop ncurses GUI, press to go to tab #5 (CLI).

Enter the following command:

disable server <backend_name>/<server_name>