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varnishcache
varnish-cache
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3eba5f8c
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3eba5f8c
authored
Apr 09, 2018
by
Nils Goroll
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warning and advise about backend proxy connections
Ref #2622
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77a5310e
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doc/sphinx/reference/vcl.rst
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3eba5f8c
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@@ -252,6 +252,21 @@ parameters. The following attributes are available:
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@@ -252,6 +252,21 @@ parameters. The following attributes are available:
The PROXY protocol version Varnish should use when connecting to
The PROXY protocol version Varnish should use when connecting to
this backend. Allowed values are ``1`` and ``2``.
this backend. Allowed values are ``1`` and ``2``.
*Notice* this setting will lead to backend connections being used
for a single request only (subject to future improvements). Thus,
extra care should be taken to avoid running into failing backend
connections with EADDRNOTAVAIL due to no local ports being
available. Possible options are:
* Use additional backend connections to extra IP addresses or TCP
ports
* Increase the number of available ports (Linux sysctl
``net.ipv4.ip_local_port_range``)
* Reuse backend connection ports early (Linux sysctl
``net.ipv4.tcp_tw_reuse``)
``.max_connections``
``.max_connections``
Maximum number of open connections towards this backend. If
Maximum number of open connections towards this backend. If
Varnish reaches the maximum Varnish it will start failing
Varnish reaches the maximum Varnish it will start failing
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