Foi porque eu tinha esquecido de criar uma pasta para sockets. Isso me ajudou:
sudo mkdir -p /run/haproxy
Estou tentando iniciar um proxy, mas sem sucesso. Aqui está um erro do journalctl -xe:
Oct 18 23:11:27 upload-server polkitd[578]: Registered Authentication Agent for unix-process:2044:11115 (system bus name :1.14 [/usr/bin/pkttyagent --notify-fd 5 --fallback], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
Oct 18 23:11:27 upload-server systemd[1]: Starting SYSV: HA-Proxy is a TCP/HTTP reverse proxy which is particularly suited for high availability environments....
-- Subject: Unit haproxy.service has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit haproxy.service has begun starting up.
Oct 18 23:11:27 upload-server haproxy[2049]: /etc/rc.d/init.d/haproxy: line 26: [: =: unary operator expected
Oct 18 23:11:27 upload-server haproxy[2053]: Proxy swift-cluster started.
Oct 18 23:11:27 upload-server haproxy[2053]: Proxy swift-cluster started.
Oct 18 23:11:27 upload-server haproxy[2049]: Starting haproxy: [ALERT] 291/231127 (2053) : Starting frontend GLOBAL: cannot bind UNIX socket [/run/haproxy/admin.sock]
Oct 18 23:11:27 upload-server haproxy[2049]: [FAILED]
Oct 18 23:11:27 upload-server systemd[1]: haproxy.service: control process exited, code=exited status=1
Oct 18 23:11:27 upload-server systemd[1]: Failed to start SYSV: HA-Proxy is a TCP/HTTP reverse proxy which is particularly suited for high availability environments..
-- Subject: Unit haproxy.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit haproxy.service has failed.
--
-- The result is failed.
Oct 18 23:11:27 upload-server systemd[1]: Unit haproxy.service entered failed state.
Oct 18 23:11:27 upload-server systemd[1]: haproxy.service failed.
Oct 18 23:11:28 upload-server polkitd[578]: Unregistered Authentication Agent for unix-process:2044:11115 (system bus name :1.14, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) (disconnected from bus)
Aqui está meu /etc/haproxy/haproxy.cfg
global
maxconn 4096
log /dev/log local0
log /dev/log local1 notice
chroot /var/lib/haproxy
stats socket /run/haproxy/admin.sock mode 660 level admin
stats timeout 30s
user haproxy
group haproxy
daemon
defaults
log global
mode http
option httplog
option dontlognull
retries 3
option redispatch
maxconn 2000
timeout connect 5000
timeout client 50000
timeout server 50000
listen swift-cluster
bind 192.168.0.91:80
mode http
stats enable
stats auth haproxy_username:haproxy_password
balance roundrobin
option httpchk HEAD /healthcheck HTTP/1.0
option forwardfor
option http-server-close
timeout http-keep-alive 500
server proxy1 192.168.0.41:80 weight 5 check inter 2000
server proxy2 192.168.0.42:80 weight 5 check inter 2000
O que estou fazendo de errado?