config file:

## This is a sample configuration file. See the nxlog reference manual about the

## configuration options. It should be installed locally under

## /usr/share/doc/nxlog-ce/ and is also available online at

## http://nxlog.org/nxlog-docs/en/nxlog-reference-manual.html

########################################

# Global directives                    #

########################################

User nxlog

Group nxlog

LogFile /var/log/nxlog/nxlog.log

LogLevel INFO

########################################

# Modules                              #

########################################

<Extension _syslog>

    Module      xm_syslog

</Extension>

<Extension multiline>

 Module xm_multiline

 HeaderLine /^\w{3}\s\w{3}\s\d{2}\s\d{2}:\d{2}:\d{2}\s\d{4}/

</Extension>

<Input oerrorin1>

 Module    im_file

 File     '/u01/app/oracle/diag/rdbms/oraywsoudb/oraywsoudb/trace/alert_oraywsoudb.log'

 InputType multiline

 SavePos TRUE

 ReadFromLast  FALSE

</Input>

<Output udpout>

 Module    om_udp

 Host   10.1.227.45

 Port   514

</Output>s

########################################

# Routes                               #

########################################

<Route 1>

    Path        oerrorin1 =>udpout

</Route>

then i get the log:

2017-03-17 16:16:39 INFO nxlog-ce-2.8.1248 started

2017-03-17 16:16:39 ERROR failed to open /u01/app/oracle/diag/rdbms/oraywsoudb/oraywsoudb/trace/alert_oraywsoudb.log;Permission denied

2017-03-17 16:16:41 ERROR apr_stat failed on file /u01/app/oracle/diag/rdbms/oraywsoudb/oraywsoudb/trace/alert_oraywsoudb.log;Permission denied

2017-03-17 16:16:47 ERROR last message repeated 2 times

2017-03-17 16:16:55 ERROR apr_stat failed on file /u01/app/oracle/diag/rdbms/oraywsoudb/oraywsoudb/trace/alert_oraywsoudb.log;Permission denied

2017-03-17 16:17:11 ERROR apr_stat failed on file /u01/app/oracle/diag/rdbms/oraywsoudb/oraywsoudb/trace/alert_oraywsoudb.log;Permission denied

2017-03-17 16:17:43 ERROR apr_stat failed on file /u01/app/oracle/diag/rdbms/oraywsoudb/oraywsoudb/trace/alert_oraywsoudb.log;Permission denied

2017-03-17 16:18:47 ERROR apr_stat failed on file /u01/app/oracle/diag/rdbms/oraywsoudb/oraywsoudb/trace/alert_oraywsoudb.log;Permission denied

2017-03-17 16:20:55 ERROR apr_stat failed on file /u01/app/oracle/diag/rdbms/oraywsoudb/oraywsoudb/trace/alert_oraywsoudb.log;Permission denied

2017-03-17 16:25:11 ERROR apr_stat failed on file /u01/app/oracle/diag/rdbms/oraywsoudb/oraywsoudb/trace/alert_oraywsoudb.log;Permission denied

2017-03-17 16:34:16 DEBUG reading config cache from /var/spool/nxlog/configcache.dat

2017-03-17 16:34:16 DEBUG Setting up module '_syslog' using xm_syslog

2017-03-17 16:34:16 DEBUG module _syslog has 4 exported functions

2017-03-17 16:34:16 DEBUG registering function syslog_facility_value

2017-03-17 16:34:16 DEBUG function 'syslog_facility_value' registered

2017-03-17 16:34:16 DEBUG registering function syslog_facility_string

2017-03-17 16:34:16 DEBUG function 'syslog_facility_string' registered

2017-03-17 16:34:16 DEBUG registering function syslog_severity_value

2017-03-17 16:34:16 DEBUG function 'syslog_severity_value' registered

2017-03-17 16:34:16 DEBUG registering function syslog_severity_string

2017-03-17 16:34:16 DEBUG function 'syslog_severity_string' registered

2017-03-17 16:34:16 DEBUG module _syslog has 9 exported procedures

2017-03-17 16:34:16 DEBUG registering procedure parse_syslog

2017-03-17 16:34:16 DEBUG procedure 'parse_syslog' registered

2017-03-17 16:34:16 DEBUG registering procedure parse_syslog

2017-03-17 16:34:16 DEBUG procedure 'parse_syslog' registered

2017-03-17 16:34:16 DEBUG registering procedure parse_syslog_bsd

2017-03-17 16:34:16 DEBUG procedure 'parse_syslog_bsd' registered

2017-03-17 16:34:16 DEBUG registering procedure parse_syslog_bsd

2017-03-17 16:34:16 DEBUG procedure 'parse_syslog_bsd' registered

2017-03-17 16:34:16 DEBUG registering procedure parse_syslog_ietf

2017-03-17 16:34:16 DEBUG procedure 'parse_syslog_ietf' registered

2017-03-17 16:34:16 DEBUG registering procedure parse_syslog_ietf

2017-03-17 16:34:16 DEBUG procedure 'parse_syslog_ietf' registered

2017-03-17 16:34:16 DEBUG registering procedure to_syslog_bsd

2017-03-17 16:34:16 DEBUG procedure 'to_syslog_bsd' registered

2017-03-17 16:34:16 DEBUG registering procedure to_syslog_ietf

2017-03-17 16:34:16 DEBUG procedure 'to_syslog_ietf' registered

2017-03-17 16:34:16 DEBUG registering procedure to_syslog_snare

2017-03-17 16:34:16 DEBUG procedure 'to_syslog_snare' registered

2017-03-17 16:34:16 DEBUG Setting up module 'multiline' using xm_multiline

2017-03-17 16:34:16 DEBUG Setting up module 'oerrorin1' using im_file

2017-03-17 16:34:16 DEBUG module oerrorin1 has 1 exported functions

2017-03-17 16:34:16 DEBUG registering function file_name

2017-03-17 16:34:16 DEBUG function 'file_name' registered

2017-03-17 16:34:16 DEBUG module oerrorin1 has 0 exported procedures

2017-03-17 16:34:16 DEBUG FlowControl enabled for oerrorin1

2017-03-17 16:34:16 DEBUG Setting up module 'udpout' using om_udp

2017-03-17 16:34:16 DEBUG Setting up module 'fileout2' using om_file

2017-03-17 16:34:16 DEBUG module fileout2 has 2 exported functions

2017-03-17 16:34:16 DEBUG registering function file_name

2017-03-17 16:34:16 DEBUG function 'file_name' registered

2017-03-17 16:34:16 DEBUG registering function file_size

2017-03-17 16:34:16 DEBUG function 'file_size' registered

2017-03-17 16:34:16 DEBUG module fileout2 has 2 exported procedures

2017-03-17 16:34:16 DEBUG registering procedure rotate_to

2017-03-17 16:34:16 DEBUG procedure 'rotate_to' registered

2017-03-17 16:34:16 DEBUG registering procedure reopen

2017-03-17 16:34:16 DEBUG procedure 'reopen' registered

2017-03-17 16:34:16 DEBUG CONFIG: _syslog

2017-03-17 16:34:16 DEBUG inputreader 'Syslog_TLS' registered

2017-03-17 16:34:16 DEBUG Inputreader 'Syslog_TLS' registered

2017-03-17 16:34:16 DEBUG outputwriter 'Syslog_TLS' registered

2017-03-17 16:34:16 DEBUG Outputwriter 'Syslog_TLS' registered

2017-03-17 16:34:16 DEBUG CONFIG: multiline

2017-03-17 16:34:16 DEBUG inputreader 'multiline' registered

2017-03-17 16:34:16 DEBUG Inputreader 'multiline' registered

2017-03-17 16:34:16 DEBUG CONFIG: oerrorin1

2017-03-17 16:34:16 DEBUG adding string [/u01/app/oracle/diag/rdbms/oraywsoudb/oraywsoudb/trace/alert_oraywsoudb.log]

2017-03-17 16:34:16 DEBUG string literal declared at line 29, character 86 in /etc/nxlog.conf

2017-03-17 16:34:16 DEBUG literal

2017-03-17 16:34:16 DEBUG parsed expression

2017-03-17 16:34:16 DEBUG CONFIG: udpout

2017-03-17 16:34:16 DEBUG CONFIG: fileout2

2017-03-17 16:34:16 DEBUG adding string [/var/log/logmsg2.txt]

2017-03-17 16:34:16 DEBUG string literal declared at line 43, character 27 in /etc/nxlog.conf

2017-03-17 16:34:16 DEBUG literal

2017-03-17 16:34:16 DEBUG parsed expression

2017-03-17 16:34:16 DEBUG pidfile /var/run/nxlog/nxlog.pid removed

2017-03-17 16:34:16 DEBUG daemonizing...

2017-03-17 16:34:16 DEBUG INIT: _syslog

2017-03-17 16:34:16 DEBUG INIT: multiline

2017-03-17 16:34:16 DEBUG INIT: oerrorin1

2017-03-17 16:34:16 DEBUG INIT: udpout

2017-03-17 16:34:16 DEBUG Pollset initialized for module udpout (method: poll)

2017-03-17 16:34:16 DEBUG INIT: fileout2

2017-03-17 16:34:16 DEBUG Pollset initialized for module fileout2 (method: poll)

2017-03-17 16:34:16 DEBUG now running as group nxlog

2017-03-17 16:34:16 WARNING additional group memberships couldn't be set because getgrouplist()and setgroups() are not available on this platform

2017-03-17 16:34:16 DEBUG now running as user nxlog

2017-03-17 16:34:16 DEBUG running as uid: 203, euid: 203, gid: 204, egid: 204

2017-03-17 16:34:16 DEBUG pidfile /var/run/nxlog/nxlog.pid created

2017-03-17 16:34:16 DEBUG parsing path: oerrorin1 =>udpout

2017-03-17 16:34:16 DEBUG adding module oerrorin1 to route 1

2017-03-17 16:34:16 DEBUG adding module udpout to route 1

2017-03-17 16:34:16 DEBUG parsing path: in2 => fileout2

2017-03-17 16:34:16 ERROR [router.c:68/nx_route_add_module()] module 'in2' is not declared at /etc/nxlog.conf:54

2017-03-17 16:34:16 DEBUG adding module fileout2 to route tcproute

2017-03-17 16:34:16 ERROR [router.c:347/nx_add_route()] route tcproute is not functional without input modules, ignored at /etc/nxlog.conf:54

2017-03-17 16:34:16 DEBUG jobgroup created with priority 99

2017-03-17 16:34:16 DEBUG jobgroup created with priority 10

2017-03-17 16:34:16 DEBUG spawning 3 worker threads

2017-03-17 16:34:16 DEBUG worker thread 0 started

2017-03-17 16:34:16 DEBUG worker thread 1 started

2017-03-17 16:34:16 DEBUG worker thread 2 started

I have no idea about this problem. 

/u01/app/oracle/diag/rdbms/oraywsoudb/oraywsoudb/trace/alert_oraywsoudb.log   --> user and group is oracle:oinstall

and i add the nxlog user in oinstall group， but why continue report Permission denied?