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Top Forums UNIX for Dummies Questions & Answers Binary line being inserted while truncating a file Post 302353272 by akshay61286 on Tuesday 15th of September 2009 03:36:37 AM
Old 09-15-2009
Quote:
Originally Posted by pludi
You've got to give us some more information on how you truncate the file, what kind of link you use, and what and how another application might write into that file, because I can't yet reproduce that behaviour
Hi,

Following are the steps which we follow :-
1) a log file is generated through the redirection of Jboss' run.sh
Code:
nohup $JBOSS_HOME/bin/run.sh -c Instance_Name >  abc.log &

2)the above log file abc.log is then linked via :-
Code:
ln abc.log $JBOSS_HOME/server/deploy/jboss-web/ROOT/abc.txt

3) Every night a copy of the log file in ROOT is made and the original one is truncated :-
Code:
>abc.txt

After step 3, a new binary line is found as the first line of the truncated file

So a few points :-
1) the log file is being written by JBoss
2) linking is not via "-s"

Hope i cleared some doubts
 

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BOS_GETLOG(8)						       AFS Command Reference						     BOS_GETLOG(8)

NAME
bos_getlog - Prints a server process's log file SYNOPSIS
bos getlog -server <machine name> -file <log file to examine> [-cell <cell name>] [-noauth] [-localauth] [-help] bos getl -s <machine name> -f <log file to examine> [-c <cell name>] [-n] [-l] [-h] DESCRIPTION
The bos getlog command displays on the standard output stream the specified log file from the machine named by the -server argument. The BOS Server fetches the log file from the /var/log/openafs directory unless an alternate pathname is provided as part of the -file argument. CAUTIONS
Log files can grow quite large, especially for the database server processes. To keep them to a manageable size, periodically either use the UNIX rm command to truncate each log file, or use the bos restart command to restart each process. It can take up to five minutes after the file is removed or process restarted for the space occupied by a log file to become available. OPTIONS
-server <machine name> Indicates the server machine from which to retrieve the log file. Identify the machine by IP address or its host name (either fully- qualified or abbreviated unambiguously). For details, see bos(8). -file <log file to examine> Names the log file to display. If a filename only is provided, the BOS Server fetches the log file from the /var/log/openafs directory; the standard values are: AuthLog The Authentication Server (kaserver) log file. BackupLog The Backup Server (buserver) log file. BosLog The BOS Server (bosserver) log file. FileLog The File Server (fileserver) log file. SalvageLog The Salvager (salvager) log file. VLLog The Volume Location (VL) Server (vlserver) log file. VolserLog The Volume Server (volserver) log file. If a pathname and filename are provided, the log file is retrieved from the indicated directory. Partial pathnames are interpreted relative to the /var/log/openafs directory. -cell <cell name> Names the cell in which to run the command. Do not combine this argument with the -localauth flag. For more details, see bos(8). -noauth Assigns the unprivileged identity "anonymous" to the issuer. Do not combine this flag with the -localauth flag. For more details, see bos(8). -localauth Constructs a server ticket using a key from the local /etc/openafs/server/KeyFile file. The bos command interpreter presents the ticket to the BOS Server during mutual authentication. Do not combine this flag with the -cell or -noauth options. For more details, see bos(8). -help Prints the online help for this command. All other valid options are ignored. OUTPUT
The output is preceded by the line Fetching log file '<filename>'... The remainder of the output depends on the particular log file. EXAMPLES
The following example displays the FileLog file from the machine "fs3.abc.com": % bos getlog -server fs3.abc.com -file FileLog Fetching log file 'FileLog'... Sun Nov 8 04:00:34 1998 File server starting Sun Nov 8 04:00:39 1998 Partition /vicepa: attached 21 volumes; 0 volumes not attached Sun Nov 8 04:00:40 1998 File Server started Sun Nov 8 04:00:40 1998 Mon Nov 9 21:45:06 1998 CB: RCallBack (zero fid probe in host.c) failed for host 28cf37c0.22811 PRIVILEGE REQUIRED
The issuer must be listed in the /etc/openafs/server/UserList file on the machine named by the -server argument, or must be logged onto a server machine as the local superuser "root" if the -localauth flag is included. When a server is in restricted mode, bos getlog can only return the contents of the salvager's log. SEE ALSO
bos(8) COPYRIGHT
IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved. This documentation is covered by the IBM Public License Version 1.0. It was converted from HTML to POD by software written by Chas Williams and Russ Allbery, based on work by Alf Wachsmann and Elizabeth Cassell. OpenAFS 2012-03-26 BOS_GETLOG(8)
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