05-30-2012
Threshold for open connections
Hey guys,
We've been having issues on one of our CentOS 6 servers and one of the java programs that runs on it. As the software hasn't caused issues in the past, I'm wondering if its a problem with the CentOS server.
Basically, the software drops it's tcp connection and won't reconnect, timing out on each occasion. I'm wondering if the number of open tcp connections on the server has exceeded a limit ? Where would a tcp limit be held ? I've had a look at /proc/sys/net/core/somaxconn and the limit in there is 128 (which seems quite low although is the default on our other 5 CentOS boxes with no issues) - would this benefit from being increased ? Also, anyone any ideas on what else I could check ? I've had a look in the /etc/sysctl.conf and there's nothing in there that relates to any incoming connection limit.
Much thanks in advance for any help, it's driving me crazy!
Jim
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LEARN ABOUT MOJAVE
curlmopt_max_host_connections
CURLMOPT_MAX_HOST_CONNECTIONS(3) curl_multi_setopt options CURLMOPT_MAX_HOST_CONNECTIONS(3)
NAME
CURLMOPT_MAX_HOST_CONNECTIONS - set max number of connections to a single host
SYNOPSIS
#include <curl/curl.h>
CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_MAX_HOST_CONNECTIONS, long max);
DESCRIPTION
Pass a long to indicate max. The set number will be used as the maximum amount of simultaneously open connections to a single host (a host
being the same as a host name + port number pair). For each new session to a host, libcurl will open a new connection up to the limit set
by CURLMOPT_MAX_HOST_CONNECTIONS(3). When the limit is reached, the sessions will be pending until a connection becomes available. If CURL-
MOPT_PIPELINING(3) is enabled, libcurl will try to pipeline if the host is capable of it.
The default max value is 0, unlimited. However, for backwards compatibility, setting it to 0 when CURLMOPT_PIPELINING(3) is 1 will not be
treated as unlimited. Instead it will open only 1 connection and try to pipeline on it.
This set limit is also used for proxy connections, and then the proxy is considered to be the host for which this limit counts.
DEFAULT
0
PROTOCOLS
HTTP(S)
EXAMPLE
TODO
AVAILABILITY
Added in 7.30.0
RETURN VALUE
Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not.
SEE ALSO
CURLMOPT_MAXCONNECTS(3), CURLMOPT_MAX_TOTAL_CONNECTIONS(3),
libcurl 7.54.0 February 03, 2016 CURLMOPT_MAX_HOST_CONNECTIONS(3)