[Unbound-users] Can't Bind Socket Error
W.C.A. Wijngaards
wouter at nlnetlabs.nl
Thu Oct 9 13:32:09 UTC 2014
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Hi Paul,
You have ipv6 enabled (#do-ipv6: yes at the default) and you have tcp
disabled. You should consider do-tcp: yes since the DNS occasionally
needs to use TCP, but that is not the cause of your socket errors.
Best regards,
Wouter
On 09/10/14 15:14, Paul Stewart wrote:
> Hi Wouter and thanks again for the prompt responses....
>
> Here is the configuration to hopefully answer your questions. I
> read through the performance documentation and made several
> adjustments so perhaps one of those changes were done in error.
>
> Much appreciated,
>
> Paul
>
> # # See unbound.conf(5) man page. # # this is a comment.
>
> #Use this to include other text into the file. #include:
> "otherfile.conf"
>
> # The server clause sets the main parameters. server: # whitespace
> is not necessary, but looks cleaner.
>
> # verbosity number, 0 is least verbose. 1 is default. verbosity: 1
>
> # print statistics to the log (for every thread) every N seconds. #
> Set to "" or 0 to disable. Default is disabled. # Needed for munin
> plugin statistics-interval: 60
>
> # enable cumulative statistics, without clearing them after
> printing. # Needed for munin plugin statistics-cumulative: yes
>
> # enable extended statistics (query types, answer codes, status) #
> printed from unbound-control. default off, because of speed. #
> Needed for munin plugin extended-statistics: yes
>
> # number of threads to create. 1 disables threading. num-threads:
> 4
>
> # specify the interfaces to answer queries from by ip-address. #
> The default is to listen to localhost (127.0.0.1 and ::1). #
> specify 0.0.0.0 and ::0 to bind to all available interfaces. #
> specify every interface on a new 'interface:' labelled line. # The
> listen interfaces are not changed on reload, only on restart.
> interface: xx.xx.xx.90 # interface: ::0 # interface: 192.0.2.153 #
> interface: 192.0.2.154 # interface: 2001:DB8::5 # # for dns over
> tls and raw dns over port 80 # interface: 0.0.0.0 at 443 # interface:
> ::0 at 443 # interface: 0.0.0.0 at 80 # interface: ::0 at 80
>
> # enable this feature to copy the source address of queries to
> reply. # Socket options are not supported on all platforms.
> experimental. # interface-automatic: yes # # NOTE: Enable this
> option when specifying interface 0.0.0.0 or ::0 # NOTE: Disabled
> per Fedora policy not to listen to * on default install # NOTE: If
> deploying on non-default port, eg 80/443, this needs to be
> disabled interface-automatic: no
>
> # port to answer queries from # port: 53
>
> # specify the interfaces to send outgoing queries to authoritative
> # server from by ip-address. If none, the default (all) interface #
> is used. Specify every interface on a 'outgoing-interface:' line. #
> outgoing-interface: 192.0.2.153 # outgoing-interface: 2001:DB8::5 #
> outgoing-interface: 2001:DB8::6
>
> # number of ports to allocate per thread, determines the size of
> the # port range that can be open simultaneously. outgoing-range:
> 200
>
> # permit unbound to use this port number or port range for # making
> outgoing queries, using an outgoing interface. #
> outgoing-port-permit: 32768
>
> # deny unbound the use this of port number or port range for #
> making outgoing queries, using an outgoing interface. # Use this to
> make sure unbound does not grab a UDP port that some # other server
> on this computer needs. The default is to avoid # IANA-assigned
> port numbers. # outgoing-port-avoid: "3200-3208"
>
> # number of outgoing simultaneous tcp buffers to hold per thread. #
> outgoing-num-tcp: 10
>
> # number of incoming simultaneous tcp buffers to hold per thread. #
> incoming-num-tcp: 10
>
> # buffer size for UDP port 53 incoming (SO_RCVBUF socket option). #
> 0 is system default. Use 4m to catch query spikes for busy
> servers. so-rcvbuf: 8m
>
> # buffer size for UDP port 53 outgoing (SO_SNDBUF socket option). #
> 0 is system default. Use 4m to handle spikes on very busy
> servers. so-sndbuf: 8m
>
> # EDNS reassembly buffer to advertise to UDP peers (the actual
> buffer # is set with msg-buffer-size). 1480 can solve
> fragmentation (timeouts). # edns-buffer-size: 4096
>
> # buffer size for handling DNS data. No messages larger than this #
> size can be sent or received, by UDP or TCP. In bytes. #
> msg-buffer-size: 65552
>
> # the amount of memory to use for the message cache. # plain value
> in bytes or you can append k, m or G. default is "4Mb". #
> msg-cache-size: 4m
>
> # the number of slabs to use for the message cache. # the number of
> slabs must be a power of 2. # more slabs reduce lock contention,
> but fragment memory usage. msg-cache-slabs: 4
>
> # the number of queries that a thread gets to service.
> num-queries-per-thread: 100
>
> # if very busy, 50% queries run to completion, 50% get timeout in
> msec # jostle-timeout: 200
>
> # the amount of memory to use for the RRset cache. # plain value in
> bytes or you can append k, m or G. default is "4Mb".
> rrset-cache-size: 2G
>
> # the number of slabs to use for the RRset cache. # the number of
> slabs must be a power of 2. # more slabs reduce lock contention,
> but fragment memory usage. rrset-cache-slabs: 4
>
> # the time to live (TTL) value lower bound, in seconds. Default 0.
> # If more than an hour could easily give trouble due to stale
> data. # cache-min-ttl: 0
>
> # the time to live (TTL) value cap for RRsets and messages in the #
> cache. Items are not cached for longer. In seconds. #
> cache-max-ttl: 86400
>
> # the time to live (TTL) value for cached roundtrip times,
> lameness # and EDNS version information for hosts. In seconds. #
> infra-host-ttl: 900
>
> # the number of slabs to use for the Infrastructure cache. # the
> number of slabs must be a power of 2. # more slabs reduce lock
> contention, but fragment memory usage. infra-cache-slabs: 4
>
> # the maximum number of hosts that are cached (roundtrip, EDNS,
> lame). # infra-cache-numhosts: 10000
>
> # Enable IPv4, "yes" or "no". do-ip4: yes
>
> # Enable IPv6, "yes" or "no". # do-ip6: yes
>
> # Enable UDP, "yes" or "no". # NOTE: if setting up an unbound on
> tls443 for public use, you might want to # disable UDP to avoid
> being used in DNS amplification attacks. do-udp: yes
>
> # Enable TCP, "yes" or "no". do-tcp: no
>
> # upstream connections use TCP only (and no UDP), "yes" or "no" #
> useful for tunneling scenarios, default no. # tcp-upstream: no
>
> # Detach from the terminal, run in background, "yes" or "no". #
> do-daemonize: yes
>
> # control which clients are allowed to make (recursive) queries #
> to this server. Specify classless netblocks with /size and action.
> # By default everything is refused, except for localhost. # Choose
> deny (drop message), refuse (polite error reply), # allow
> (recursive ok), allow_snoop (recursive and nonrecursive ok) #
> access-control: 0.0.0.0/0 refuse access-control: xxx.xxx.xx.0/19
> allow access-control: xx.xxx.xx.0/19 allow access-control:
> xx.xxx.xx.0/18 allow access-control: xx.xxx.0.0/18 allow
> access-control: xxx.xxx.xxx.0/17 allow # access-control: ::0/0
> refuse # access-control: ::1 allow # access-control:
> ::ffff:127.0.0.1 allow
>
> # if given, a chroot(2) is done to the given directory. # i.e. you
> can chroot to the working directory, for example, # for extra
> security, but make sure all files are in that directory. # # If
> chroot is enabled, you should pass the configfile (from the #
> commandline) as a full path from the original root. After the #
> chroot has been performed the now defunct portion of the config #
> file path is removed to be able to reread the config after a
> reload. # # All other file paths (working dir, logfile, roothints,
> and # key files) can be specified in several ways: # o as an
> absolute path relative to the new root. # o as a relative path to
> the working directory. # o as an absolute path relative to the
> original root. # In the last case the path is adjusted to remove
> the unused portion. # # The pid file can be absolute and outside of
> the chroot, it is # written just prior to performing the chroot and
> dropping permissions. # # Additionally, unbound may need to access
> /dev/random (for entropy). # How to do this is specific to your
> OS. # # If you give "" no chroot is performed. The path must not
> end in a /. # chroot: "/var/lib/unbound" chroot: ""
>
> # if given, user privileges are dropped (after binding port), # and
> the given username is assumed. Default is user "unbound". # If you
> give "" no privileges are dropped. username: "unbound"
>
> # the working directory. The relative files in this config are #
> relative to this directory. If you give "" the working directory #
> is not changed. directory: "/etc/unbound"
>
> # the log file, "" means log to stderr. # Use of this option sets
> use-syslog to "no". # logfile: ""
>
> # Log to syslog(3) if yes. The log facility LOG_DAEMON is used to #
> log to, with identity "unbound". If yes, it overrides the logfile.
> # use-syslog: yes
>
> # print UTC timestamp in ascii to logfile, default is epoch in
> seconds. log-time-ascii: yes
>
> # the pid file. Can be an absolute path outside of chroot/work
> dir. pidfile: "/var/run/unbound/unbound.pid"
>
> # file to read root hints from. # get one from
> ftp://FTP.INTERNIC.NET/domain/named.cache # root-hints: ""
>
> # enable to not answer id.server and hostname.bind queries. #
> hide-identity: no
>
> # enable to not answer version.server and version.bind queries. #
> hide-version: no
>
> # the identity to report. Leave "" or default to return hostname. #
> identity: ""
>
> # the version to report. Leave "" or default to return package
> version. # version: ""
>
> # the target fetch policy. # series of integers describing the
> policy per dependency depth. # The number of values in the list
> determines the maximum dependency # depth the recursor will pursue
> before giving up. Each integer means: # -1 : fetch all targets
> opportunistically, # 0: fetch on demand, # positive value: fetch
> that many targets opportunistically. # Enclose the list of numbers
> between quotes (""). # target-fetch-policy: "3 2 1 0 0"
>
> # Harden against very small EDNS buffer sizes. #
> harden-short-bufsize: no
>
> # Harden against unseemly large queries. # harden-large-queries:
> no
>
> # Harden against out of zone rrsets, to avoid spoofing attempts.
> harden-glue: yes
>
> # Harden against receiving dnssec-stripped data. If you turn it #
> off, failing to validate dnskey data for a trustanchor will #
> trigger insecure mode for that zone (like without a trustanchor). #
> Default on, which insists on dnssec data for trust-anchored zones.
> harden-dnssec-stripped: yes
>
> # Harden against queries that fall under dnssec-signed nxdomain
> names. harden-below-nxdomain: yes
>
> # Harden the referral path by performing additional queries for #
> infrastructure data. Validates the replies (if possible). #
> Default off, because the lookups burden the server. Experimental #
> implementation of
> draft-wijngaards-dnsext-resolver-side-mitigation.
> harden-referral-path: yes
>
> # Use 0x20-encoded random bits in the query to foil spoof
> attempts. # This feature is an experimental implementation of draft
> dns-0x20. # (this now fails on all GoDaddy customer domains, so
> disabled) use-caps-for-id: no
>
> # Enforce privacy of these addresses. Strips them away from
> answers. # It may cause DNSSEC validation to additionally mark it
> as bogus. # Protects against 'DNS Rebinding' (uses browser as
> network proxy). # Only 'private-domain' and 'local-data' names are
> allowed to have # these private addresses. No default. #
> private-address: 10.0.0.0/8 # private-address: 172.16.0.0/12 #
> private-address: 192.168.0.0/16 # private-address: 192.254.0.0/16 #
> private-address: fd00::/8 # private-address: fe80::/10
>
> # Allow the domain (and its subdomains) to contain private
> addresses. # local-data statements are allowed to contain private
> addresses too. # private-domain: "example.com"
>
> # If nonzero, unwanted replies are not only reported in
> statistics, # but also a running total is kept per thread. If it
> reaches the # threshold, a warning is printed and a defensive
> action is taken, # the cache is cleared to flush potential poison
> out of it. # A suggested value is 10000000, the default is 0
> (turned off). unwanted-reply-threshold: 10000000
>
> # Do not query the following addresses. No DNS queries are sent
> there. # List one address per entry. List classless netblocks with
> /size, # do-not-query-address: 127.0.0.1/8 # do-not-query-address:
> ::1
>
> # if yes, the above default do-not-query-address entries are
> present. # if no, localhost can be queried (for testing and
> debugging). # do-not-query-localhost: yes
>
> # if yes, perform prefetching of almost expired message cache
> entries. prefetch: yes
>
> # if yes, perform key lookups adjacent to normal lookups.
> prefetch-key: yes
>
> # if yes, Unbound rotates RRSet order in response.
> rrset-roundrobin: yes
>
> # if yes, Unbound doesn't insert authority/additional sections #
> into response messages when those sections are not required.
> minimal-responses: yes
>
> # module configuration of the server. A string with identifiers #
> separated by spaces. "iterator" or "validator iterator" #
> module-config: "validator iterator"
>
> # File with DLV trusted keys. Same format as trust-anchor-file. #
> There can be only one DLV configured, it is trusted from root
> down. # Downloaded from
> https://secure.isc.org/ops/dlv/dlv.isc.org.key dlv-anchor-file:
> "/etc/unbound/dlv.isc.org.key"
>
> # File with trusted keys for validation. Specify more than one
> file # with several entries, one file per entry. # Zone file
> format, with DS and DNSKEY entries. # trust-anchor-file: ""
>
> # File with trusted keys, kept uptodate using RFC5011 probes, #
> initial file like trust-anchor-file, then it stores metadata. # Use
> several entries, one per domain name, to track multiple zones. #
> auto-trust-anchor-file: ""
>
> # Trusted key for validation. DS or DNSKEY. specify the RR on a #
> single line, surrounded by "". TTL is ignored. class is IN
> default. # (These examples are from August 2007 and may not be
> valid anymore). # trust-anchor: "nlnetlabs.nl. DNSKEY 257 3 5
> AQPzzTWMz8qSWIQlfRnPckx2BiVmkVN6LPupO3mbz7FhLSnm26n6iG9N
> Lby97Ji453aWZY3M5/xJBSOS2vWtco2t8C0+xeO1bc/d6ZTy32DHchpW 6rDH1vp8
> 6Ll+ha0tmwyy9QP7y2bVw5zSbFCrefk8qCUBgfHm9bHzMG1U BYtEIQ==" #
> trust-anchor: "jelte.nlnetlabs.nl. DS 42860 5 1
> 14D739EB566D2B1A5E216A0BA4D17FA9B038BE4A"
>
> # File with trusted keys for validation. Specify more than one
> file # with several entries, one file per entry. Like
> trust-anchor-file # but has a different file format. Format is
> BIND-9 style format, # the trusted-keys { name flag proto algo
> "key"; }; clauses are read. # trusted-keys-file: "" # #
> trusted-keys-file: /etc/unbound/rootkey.bind trusted-keys-file:
> /etc/unbound/keys.d/*.key auto-trust-anchor-file:
> "/var/lib/unbound/root.key"
>
> # Ignore chain of trust. Domain is treated as insecure. #
> domain-insecure: "example.com"
>
> # Override the date for validation with a specific fixed date. # Do
> not set this unless you are debugging signature inception # and
> expiration. "" or "0" turns the feature off. # val-override-date:
> ""
>
> # The time to live for bogus data, rrsets and messages. This
> avoids # some of the revalidation, until the time interval expires.
> in secs. # val-bogus-ttl: 60
>
> # The signature inception and expiration dates are allowed to be
> off # by 10% of the lifetime of the signature from our local
> clock. # This leeway is capped with a minimum and a maximum. In
> seconds. # val-sig-skew-min: 3600 # val-sig-skew-max: 86400
>
> # Should additional section of secure message also be kept clean
> of # unsecure data. Useful to shield the users of this validator
> from # potential bogus data in the additional section. All unsigned
> data # in the additional section is removed from secure messages.
> val-clean-additional: yes
>
> # Turn permissive mode on to permit bogus messages. Thus, messages
> # for which security checks failed will be returned to clients, #
> instead of SERVFAIL. It still performs the security checks, which #
> result in interesting log files and possibly the AD bit in #
> replies if the message is found secure. The default is off. # NOTE:
> TURNING THIS ON DISABLES ALL DNSSEC SECURITY val-permissive-mode:
> no
>
> # Have the validator log failed validations for your diagnosis. #
> 0: off. 1: A line per failed user query. 2: With reason and bad
> IP. val-log-level: 1
>
> # It is possible to configure NSEC3 maximum iteration counts per #
> keysize. Keep this table very short, as linear search is done. # A
> message with an NSEC3 with larger count is marked insecure. # List
> in ascending order the keysize and count values. #
> val-nsec3-keysize-iterations: "1024 150 2048 500 4096 2500"
>
> # instruct the auto-trust-anchor-file probing to add anchors after
> ttl. # add-holddown: 2592000 # 30 days
>
> # instruct the auto-trust-anchor-file probing to del anchors after
> ttl. # del-holddown: 2592000 # 30 days
>
> # auto-trust-anchor-file probing removes missing anchors after
> ttl. # If the value 0 is given, missing anchors are not removed. #
> keep-missing: 31622400 # 366 days
>
> # the amount of memory to use for the key cache. # plain value in
> bytes or you can append k, m or G. default is "4Mb". #
> key-cache-size: 4m
>
> # the number of slabs to use for the key cache. # the number of
> slabs must be a power of 2. # more slabs reduce lock contention,
> but fragment memory usage. key-cache-slabs: 4
>
> # the amount of memory to use for the negative cache (used for
> DLV). # plain value in bytes or you can append k, m or G. default
> is "1Mb". # neg-cache-size: 1m
>
> # a number of locally served zones can be configured. #
> local-zone: <zone> <type> # local-data: "<resource record
> string>" # o deny serves local data (if any), else, drops queries.
> # o refuse serves local data (if any), else, replies with error. #
> o static serves local data, else, nxdomain or nodata answer. # o
> transparent serves local data, but resolves normally for other
> names # o redirect serves the zone data for any subdomain in the
> zone. # o nodefault can be used to normally resolve AS112 zones. #
> o typetransparent resolves normally for other types and other
> names # # defaults are localhost address, reverse for 127.0.0.1 and
> ::1 # and nxdomain for AS112 zones. If you configure one of these
> zones # the default content is omitted, or you can omit it with
> 'nodefault'. # # If you configure local-data without specifying
> local-zone, by # default a transparent local-zone is created for
> the data. # # You can add locally served data with # local-zone:
> "local." static # local-data: "mycomputer.local. IN A 192.0.2.51" #
> local-data: 'mytext.local TXT "content of text record"' # # You can
> override certain queries with # local-data: "adserver.example.com A
> 127.0.0.1" # # You can redirect a domain to a fixed address with #
> (this makes example.com, www.example.com, etc, all go to
> 192.0.2.3) # local-zone: "example.com" redirect # local-data:
> "example.com A 192.0.2.3" # # Shorthand to make PTR records, "IPv4
> name" or "IPv6 name". # You can also add PTR records using
> local-data directly, but then # you need to do the reverse notation
> yourself. # local-data-ptr: "192.0.2.3 www.example.com"
>
> include: /etc/unbound/local.d/*.conf
>
> # service clients over SSL (on the TCP sockets), with plain DNS
> inside # the SSL stream. Give the certificate to use and private
> key. # default is "" (disabled). requires restart to take effect.
> # ssl-service-key: "/etc/unbound/unbound_server.key" #
> ssl-service-pem: "/etc/unbound/unbound_server.pem" # ssl-port: 443
>
> # request upstream over SSL (with plain DNS inside the SSL
> stream). # Default is no. Can be turned on and off with
> unbound-control. # ssl-upstream: no
>
> ## Python config section. To enable: ## o use --with-pythonmodule
> to configure before compiling. ## o list python in the
> module-config string (above) to enable. ## o and give a
> python-script to run. #python: # # Script file to load # #
> python-script: "/etc/unbound/ubmodule-tst.py"
>
>
> # Remote control config section. remote-control: # Enable remote
> control with unbound-control(8) here. # set up the keys and
> certificates with unbound-control-setup. # Note: required for
> unbound-munin package control-enable: yes
>
> # what interfaces are listened to for remote control. # give
> 0.0.0.0 and ::0 to listen to all interfaces. # control-interface:
> 127.0.0.1 # control-interface: ::1
>
> # port number for remote control operations. # control-port: 953
>
> # unbound server key file. server-key-file:
> "/etc/unbound/unbound_server.key"
>
> # unbound server certificate file. server-cert-file:
> "/etc/unbound/unbound_server.pem"
>
> # unbound-control key file. control-key-file:
> "/etc/unbound/unbound_control.key"
>
> # unbound-control certificate file. control-cert-file:
> "/etc/unbound/unbound_control.pem"
>
> # Stub and Forward zones
>
> include: /etc/unbound/conf.d/*.conf
>
> # Stub zones. # Create entries like below, to make all queries for
> 'example.com' and # 'example.org' go to the given list of
> nameservers. list zero or more # nameservers by hostname or by
> ipaddress. If you set stub-prime to yes, # the list is treated as
> priming hints (default is no). # stub-zone: # name: "example.com" #
> stub-addr: 192.0.2.68 # stub-prime: "no" # stub-zone: # name:
> "example.org" # stub-host: ns.example.com. # You can now also
> dynamically create and delete stub-zone's using # unbound-control
> stub_add domain.com 1.2.3.4 5.6.7.8 # unbound-control stub_remove
> domain.com 1.2.3.4 5.6.7.8
>
> # Forward zones # Create entries like below, to make all queries
> for 'example.com' and # 'example.org' go to the given list of
> servers. These servers have to handle # recursion to other
> nameservers. List zero or more nameservers by hostname # or by
> ipaddress. Use an entry with name "." to forward all queries. # If
> you enable forward-first, it attempts without the forward if it
> fails. # forward-zone: # name: "example.com" # forward-addr:
> 192.0.2.68 # forward-addr: 192.0.2.73 at 5355 # forward to port
> 5355. # forward-first: no # forward-zone: # name: "example.org" #
> forward-host: fwd.example.com # # You can now also dynamically
> create and delete forward-zone's using # unbound-control
> forward_add domain.com 1.2.3.4 5.6.7.8 # unbound-control
> forward_remove domain.com 1.2.3.4 5.6.7.8
>
> -----Original Message----- From: Unbound-users
> [mailto:unbound-users-bounces at unbound.net] On Behalf Of W.C.A.
> Wijngaards Sent: Thursday, October 09, 2014 7:54 AM To:
> unbound-users at unbound.net Subject: Re: [Unbound-users] Can't Bind
> Socket Error
>
> Hi Paul,
>
> Did you configure the interface or the outgoing-interface? In any
> case, 0.0.0.0 or your IP giving permission denied once in a while
> is bad. Something is wrong with your system somehow, and it is
> intermittent. Are there port numbers that are not allowed by
> system policy that you have enabled in unbound.conf (by default it
> skips <1024 ports) ?
>
> Best regards, Wouter
>
> On 09/10/14 13:42, Paul Stewart wrote:
>> Thank you for the response. There is only one interface
>> configured in the CentOS and IPv6 is disabled (for now - it will
>> be turned up shortly).
>
>> In the configuration of Unbound, I specified the IP address
>> (there is only one) - should I perhaps change the IP to 0.0.0.0?
>> It doesn't appear that the error in the log file is causing any
>> serious issues ....
>
>> Cheers, Paul
>
>
>>>
>>> We just started migrating some of our customer base over to
>>> Unbound.
>>>
>>>
>>>
>>> Server is VM instance (VmWare) with 8 Gig RAM, 4 vCPU's running
>>> CentOS 7 (64 bit). Unbound version 1.4.20 via YUM package
>>> install.
>
>> The socket bind this late is for queries to upstream authority
>> servers, it is trying to bind one of the outgoing-interface IP
>> addresses. If you configured it, one of those addresses is not
>> actually served by your system (or the VM). Another option is
>> that IPv6 is broken in the VM and binding the ipv6 fd to ::0
>> fails.
>
>> Best regards, Wouter
>
>>> We started noticing the following errors in the logs this
>>> evening:
>>>
>>>
>>>
>>> Oct 8 19:48:51 dns2-pppoe unbound: [1110:0] error: can't bind
>>> *socket*: Permission denied
>
>
>> _______________________________________________ Unbound-users
>> mailing list Unbound-users at unbound.net
>> http://unbound.nlnetlabs.nl/mailman/listinfo/unbound-users
>
>
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