Reloading with expose-fd and multiple sockets?

@jsumners wrote:

I am updating https://github.com/jsumners/haproxy-rhel7 and want to provide seamless reloads in the default configuration. I am unclear about reloading with multiple stats sockets. Let’s assume we have two stats sockets /run/haproxy.sock1 and /run/haproxy.sock2. Would we do the following for a reload?

> haproxy -c -f /etc/haproxy.cfg -q -x /run/haproxy.sock1 -x /run/haproxy.sock2
> kill -USR2 $(cat /run/haproxy.pid)

Or do we only have to specify the first socket?

Additionally, the documentation suggests using -sf $(cat /run/haproxy.pid) for gracefully terminating old processes. I do not know if this is possible with systemd (without a custom startup script). Will -sf simply read a file specified without having to cat it?

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