kubespray/roles/kubernetes/node/templates/haproxy.cfg.j2

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global
maxconn 4000
log 127.0.0.1 local0
defaults
mode http
log global
option httplog
option dontlognull
option http-server-close
option redispatch
retries 5
timeout http-request 5m
timeout queue 5m
timeout connect 30s
timeout client 15m
timeout server 15m
timeout http-keep-alive 30s
timeout check 30s
maxconn 4000
{% if loadbalancer_apiserver_healthcheck_port is defined -%}
frontend healthz
bind *:{{ loadbalancer_apiserver_healthcheck_port }}
mode http
monitor-uri /healthz
{% endif %}
frontend kube_api_frontend
bind 127.0.0.1:{{ loadbalancer_apiserver_port|default(kube_apiserver_port) }}
mode tcp
option tcplog
default_backend kube_api_backend
backend kube_api_backend
mode tcp
balance leastconn
default-server inter 15s downinter 15s rise 2 fall 2 slowstart 60s maxconn 1000 maxqueue 256 weight 100
option httpchk GET /healthz
http-check expect status 200
{% for host in groups['kube-master'] -%}
server {{ host }} {{ hostvars[host]['access_ip'] | default(hostvars[host]['ip'] | default(fallback_ips[host])) }}:{{ kube_apiserver_port }} check check-ssl verify none
{% endfor -%}