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100 lines
2.2 KiB
ReStructuredText
100 lines
2.2 KiB
ReStructuredText
.. _configuration_resolver_c_ares:
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c_ares
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======
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This is the resolver based on c-ares library.
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server
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------
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**required**, **type**: str | seq
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Set the nameservers.
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For *str* value, it may be one or more :ref:`sockaddr str <conf_value_sockaddr_str>` joined with whitespace characters.
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For *seq* value, each of its value should be :ref:`sockaddr str <conf_value_sockaddr_str>`.
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The default port *53* will be used, if not port is specified in the value string.
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Servers in different address families can be set in together.
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each_timeout
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------------
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**optional**, **type**: int, **unit**: ms
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The number of milliseconds each name server is given to respond to a query on the first try.
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After the first try, the timeout algorithm becomes more complicated, but scales linearly with the value of timeout.
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**default**: 5000
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each_tries
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----------
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**optional**, **type**: int
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The number of tries the resolver will try contacting each name server before giving up.
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**default**: 2
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round_robin
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-----------
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**optional**, **type**: bool
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If true, perform round-robin selection of the nameservers configured for the channel for each resolution.
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**default**: false
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socket_send_buffer_size
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-----------------------
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**optional**, **type**: u32
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Set the send buffer size for the socket.
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**default**: not set, which should be the value of /proc/sys/net/core/wmem_default
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socket_recv_buffer_size
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-----------------------
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**optional**, **type**: u32
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Set the recv buffer size for the socket.
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**default**: not set, which should be the value of /proc/sys/net/core/rmem_default
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bind_ipv4
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---------
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**optional**, **type**: :ref:`ipv4 addr str <conf_value_ipv4_addr_str>`
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Set the IPv4 bind ip for the resolver while setting up sockets.
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bind_ipv6
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---------
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**optional**, **type**: :ref:`ipv6 addr str <conf_value_ipv6_addr_str>`
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Set the IPv6 bind ip for the resolver while setting up sockets.
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negative_ttl
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------------
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**optional**, **type**: u32
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Time-to-Live (TTL) for negative caching of failed DNS lookups.
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This also sets the lower cache limit on positive lookups.
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**default**: 30
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positive_ttl
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------------
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**optional**, **type**: u32
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Upper limit on how long we will cache positive DNS responses. It should long than *negative_ttl*.
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**default**: 3600
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