A meeting someday and somewhere.
Me: "Please, could I get command line access to HAProxy?"
Ops: "Wooo-hooo! Well. Let's say...I think... No!"
Me: "Why? It would speed up my work."
Ops: "Well. Quite a complex system submitting the wrong command will let us all die!"
Me: "Oh. I didn't know."
So I told the story to my friend CURL. And here's our solution:
If you're using basic authentication for your HAProxy admin page, find something like
Authorization:Basic UsuAnb123neb2Zc39=
in your web browsers request headers (F12 in Chrome will do the job). Assume your HAProxy web admin interface is running on 10.0.0.10:4444, your CURL would look like:
curl --header "Authorization:Basic UsuAnb123neb2Zc39=" --data "s=SERVERNAME&action=[disable|enable]&b=INTERFACE" http://10.0.0.10:4444
Replace INTERFACE by name shown on admin page for each interface which is load balanced. Replace SERVERNAME with name of the machine to be enabled/disabled.
Great fun to bulk enable/disable nodes/interfaces without anoying use of HAProxy web interface. Gets you a step further to deployment or maintenance automation.
