Unknow number after ip from client

andres_cozme · May 11, 2022, 11:58am

Hi! anyone can tell me what is that number after the client ip?

2022-05-10T21:09:18.455+0000 I NETWORK [thread1] connection accepted from 127.0.0.1:42969 #5 (3 connections now open)
2022-05-10T21:09:18.455+0000 I NETWORK [thread1] connection accepted from 127.0.0.1:42970 #6 (4 connections now open)

I tried to find which file handle the log output on the source code to figure out but with no luck.
Anyone know?

Stennie_X · May 11, 2022, 12:39pm

Hi @andres_cozme,

You can search the relevant version of server source code for a unique string like “connection accepted from” to find relevant log lines. Based on the log format in your output, you’re working with a version older than MongoDB 4.4 (which switched to structured logging using JSON).

For example, matching this line in the MongoDB v4.2 source:

github.com

mongodb/mongo/blob/v4.2/src/mongo/transport/service_entry_point_impl.cpp#L166


      
              if (!quiet) {
                  log() << "connection refused because too many open connections: " << connectionCount;
              }
              return;
          } else if (usingMaxConnOverride && _adminInternalPool) {
              ssm->setServiceExecutor(_adminInternalPool.get());
          }
          
          
if (!quiet) {
              const auto word = (connectionCount == 1 ? " connection"_sd : " connections"_sd);
              log() << "connection accepted from " << session->remote() << " #" << session->id() << " ("
                    << connectionCount << word << " now open)";
          }
          
          
ssm->setCleanupHook([this, ssmIt, quiet, session = std::move(session)] {
              size_t connectionCount;
              auto remote = session->remote();
              {
                  stdx::lock_guard<decltype(_sessionsMutex)> lk(_sessionsMutex);
                  _sessions.erase(ssmIt);
                  connectionCount = _sessions.size();

The value after the IP address (eg 42969) is the ephemeral port associated with the TCP/IP connection.

Regards,
Stennie

andres_cozme · May 11, 2022, 12:55pm

Hi Stennie! thanks for the quick reply.

The first thing I tried was searching for the string "connection accepted from " using the github searcher on the mongo repository but I didn’t found anything. Maybe I’m using it wrong.

best regards
Andres

system · May 16, 2022, 12:55pm

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