haproxy配置文件模板

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global
    # Log to syslog
    log      ${hosts:syslog}:${ports:syslog} local2
    
    # Max connections
    maxconn  ${limits:open-files}
    
    # Number of processes
    nbproc 1

defaults
    # Use HTTP connections
    mode http
    
    # close HTTP keep-alives to make header analysis work across keep-alives
    option httpclose
    
    # Remove requests from the queue if people press stop button
    option abortonclose
    
    # Try to connect this many times on failure
    retries 3
    
    # If a client is bound to a particular backend but it goes down,
    # send them to a different one
    option redispatch
    
    # Expose a URL to make it easier to check if haproxy is up
    monitor-uri /_haproxy_ping_
    
    # Default timeouts
    timeout connect 7s
    timeout queue   300s
    timeout client  300s
    timeout server  300s
    
    # Enable status page at this URL, on the port HAProxy is bound to
    listen stats  ${hosts:haproxy}:${ports:haproxy-stats}
    stats enable
    stats uri /
    stats refresh 5s
    stats realm Haproxy statistics

# Default front-end
frontend loadbalancer
    
    # Bind to the given address
    bind ${hosts:haproxy}:${ports:haproxy}
    
    # Log errors in HTTP logging format
    log    global
    option httplog
    option dontlog-normal
    
    # Access rules
    
    # Check that we have at least one node up in each cluster
    acl default_cluster_up nbsrv(default) gt 0
    
    # Routing
    use_backend default if default_cluster_up
    
    default_backend panic

# Backend for all nodes.
backend default
    
    # Load balance based on number of connections
    balance leastconn
    
    # Record where we've been
    rspadd X-Cluster:\ default
    
    # Note: The maxconn values here match the ZServer thread count. This means requests pile up
    # in HAProxy until Zope's ready, instead of getting stuck in Zope.
    
    server instance1  ${hosts:instance1}:${ports:instance1} check rise 1 weight 50 maxconn 4
    server instance2  ${hosts:instance2}:${ports:instance2} check rise 1 weight 50 maxconn 4
    server instance3  ${hosts:instance3}:${ports:instance3} check rise 1 weight 50 maxconn 4
    server instance4  ${hosts:instance4}:${ports:instance4} check rise 1 weight 50 maxconn 4

# This is hit only if none of the other clusters are working
backend panic
    
    balance leastconn
    
    # Panic!!!!111eleven!!
    redirect location ${urls:fallback} drop-query
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