TCP Health Checks
A basic TCP-layer health check tries to connect to the server's TCP port. The check is valid when the server answers with a SYN/ACK packet. Enable it by adding a
check parameter to each
server line that you would like to monitor.
In the following example, the load balancer tries to connect to port 80 on each server:
backend be_myapp server srv1 10.0.0.1:80 check server srv2 10.0.0.2:80 check
To send health check probes to a port other than the one to which normal traffic is sent, add the
port parameter. In the following example, the health check is sent to port 8080.
backend be_myapp server srv1 10.0.0.1:80 check port 8080 server srv2 10.0.0.2:80 check port 8080
Next upHTTP Health Checks