CentOS 6.5_x64 install Oracle 11g R2

[root@oracledb ~]# hostname oracledb [root@oracledb ~]#

[root@oracledb ~]# vi /etc/hosts [root@oracledb ~]# ifconfig -a eth0      Link encap:Ethernet  HWaddr 00:0C:29:E7:97:A3 inet addr:  Bcast:  Mask: inet6 addr: fe80::20c:29ff:fee7:97a3/64 Scope:Link UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1 RX packets:306 errors:0 dropped:0 overruns:0 frame:0 TX packets:202 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:32272 (31.5 KiB)  TX bytes:24144 (23.5 KiB)


POODLE = Padding Oracle On Downgraded Legacy Encryption

POODLE = Padding Oracle On Downgraded Legacy Encryption

B.E.A.S.T (Browser Exploit Against SSL TLS) Affected systems: Netscape 3.0 ssl tls Netscape affected system: tls Netscape 1.2 Netscape 1.1 tls tls Netscape 1.0 Description: CVE (CAN) ID: CVE-2014-3566

SSL3.0 is obsolete and no security protocol, has been TLS 1.0, TLS 1.1, TLS 1.2 substitution, for compatibility […]

Logical Volume Manager

Server:  Centos Logical Volume (Centos 6.5)  =

Disk to use:  Disk /dev/sdb: 50GB  DISK A  Disk /dev/sdc: 50GB  DISK B  Disk /dev/sdd: 50GB  DISK C




Disk /dev/sdb: 53.7 GB, 53687091200 bytes 255 heads, 63 sectors/track, 6527 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size […]

Log Rotation in Catalina.out

1. Remove all logs of manager& admin

Remove 90 days old logs  Backup logs greater that 35MB


rm -rf /app/tomcat-6.0.18/logs/*manager* /app/tomcat-6.0.18/logs/*admin*

find /cda1-logs-backups -name ‘*.gz’ -mtime +90 -exec rm {} \;

echo “Initiating logrotate `date +%F-%A`” >> /app/tomcat-6.0.18/logs/diskutil.log

cd /app/tomcat-6.0.18/logs/

siz_catalina=`/bin/ls -l catalina.out | /bin/awk ‘{ print $5 }’`

if [ $siz_catalina -ge “3600000” […]

Rotating catalina.out log files

It is possible to rotate the catalina.out log, by using a log rotation program like rotatelogs or cronolog.

It is possible to rotate the catalina.out log, but it is not controlled by the standard or files.

The catalina.out log is stderr and stdout piped to a file. If you want to rotate this […]

catalina.out log rotation

I am interested in catalina.out log file rotation, I have an application where logging to catalina.out is very huge, say 0.5 MB / sec.

So I have written one script to handle this which is shown below.


# crontab -l | grep catalina

0,30 * * * * bash /  >/dev/null 2>&1


# […]


powerful mail server, Zimbra has some system security features applied by default. We can also applying some additional security policy to increase mail server protection, such as applying PolicyD and Fail2Ban

All the above security rule may be sufficient, but there are some additional security tips should be considered, especially in the case of SMTP […]

Disk usage 100% even after deleting files

Reducing Disk Usage When Linux complains that the disk is full, you will naturally try to delete some files or move them away from the filled-up partition. So you delete some large files, and check to see that the disk usage is much lower. $ sudo du -shx / 7.8G    / But df tells you […]



One of the important features that are needed on a mail server is archiving, the backup copy of all incoming and outgoing mail.

Although we can do the backup process periodically for every account, archiving more better and efficient because we have all of copy email which 100% similar with the original.

However, beside […]

Zimbra 8 – Adjust max attachment size for email

his sets the maximum attachment size to 50 megabytes. Log into the shell account and type the […]