HAProxy not starting after upgrade to 2.7.0

[wgold]

I did update the slave node of my cluster first to 2.7.0.
There it doesn't like my haproxy configuration.

The system log says:
Jul 16 16:31:13 node5 php-fpm[383]: haproxy: check error output: [WARNING] 196/163113 (64407) : parsing [/var/etc/haproxy_test/haproxy.cfg:104]: 'option httpchk' : hiding headers or body at the end of the version string is deprecated. Please, consider to use 'http-check send' directive instead. [WARNING] 196/163113 (64407) : Can't open global server state file '/tmp/haproxy_server_state': No such file or directory Warnings were found. Configuration file is valid

On the primary system haproxy is running with the parameters:
/usr/local/sbin/haproxy -f /var/etc/haproxy/haproxy.cfg -p /var/run/haproxy.pid -D -x /tmp/haproxy.socket -sf 98200

I can get haproxy to also run on 2.7.0 when I don't apply: "-x /tmp/haproxy.socket"

Can someone please help?