如何避免在控制台上打印syslog广播消息

Question

如何避免在控制台上打印syslog广播消息

10

当连接到PostgreSQL数据库失败时，我编写了一小段代码，使用C API向syslog发送消息。

int main ( int argc, char **argv )
{
        PGconn *psql;
        PGresult *res;
        int flag = 0;

        openlog ( "postgres", LOG_NDELAY, LOG_SYSLOG );

        psql = PQconnectdb("hostaddr = '127.0.0.0' port = '5432' dbname = 'RtpDb' user = 'rtp_user_99' password = 'rtp_user' connect_timeout = '10'");
        if ( PQstatus(psql) != CONNECTION_OK )
        {
           //Send an event to syslog for DB Connection Failure
           syslog (LOG_EMERG, "%s", PQerrorMessage(psql) )
        }
       closelog ();
       PQclear(res);
       PQfinish(psql);
}

当连接到postgres数据库失败时，即使在openlog中未启用LOG_CONS选项，消息仍会打印到控制台上。

Broadcast message from systemd-journald@blr09 (Tue 2017-01-03 05:24:46 EST):
postgres[40933]: could not connect to server: Network is unreachable
        Is the server running on host "127.0.0.0" and accepting
        TCP/IP connections on port 5432?
Message from syslogd@blr09 at Jan  3 05:24:46 ...
 postgres:could not connect to server: Network is unreachable#012#011Is the server running on host "127.0.0.0" and accepting#012#011TCP/IP connections on port 5432?

请问如何避免信息在控制台上打印？

- Nikhil

3

相关链接：http://serverfault.com/a/392333/143982 - alk

那么，敢展示一下你的syslog守护进程配置吗？ - alk

1个回答

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- Nikhil · Accepted Answer

在 @alk 提供的提示下，我进行了更多的研究，并找到了如何避免消息被打印到控制台上。

Broadcast message from systemd-journald@blr09 (Tue 2017-01-03 05:24:46 EST):
postgres[40933]: could not connect to server: Network is unreachable
        Is the server running on host "127.0.0.0" and accepting
        TCP/IP connections on port 5432?
Message from syslogd@blr09 at Jan  3 05:24:46 ...
 postgres:could not connect to server: Network is unreachable#012#011Is the server running on host "127.0.0.0" and accepting#012#011TCP/IP connections on port 5432?

以上消息有两个部分：

来自systemd-journald的广播消息 => 当发送紧急消息时，这些消息将通过journalctl在控制台上打印。要禁用这些消息，我们需要在/etc/systemd/journald.conf中禁用ForwardToWall，即ForwardToWall=no
来自syslogd的消息 => 由于/etc/rsyslog.conf中的以下配置行，这些消息由rsyslog打印：

*.emerg                                                 :omusrmsg:*

syslog ( LOG_ALERT, "%s", PQerrorMessage(psql) );

感谢@alk。