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JBoss Too Many Files Open Error


First of all you want to determine what file(s) remain open. I’m assuming your server runs linux, so once you know JBoss’es PID

ps ax | grep something-that-makes-your-jboss-process-unique

you can do

ls -l /proc/jbosspid/fd

to get a nice list of files that are open at that instant.

What you’re going to do next depends […]

HTTPS TLS performance optimization details

HTTPS TLS performance optimization details

HTTPS (HTTP over SSL) is a security-oriented HTTP channel and can be understood as HTTP + SSL/TLS, that is, adding an SSL/TLS layer under HTTP as a security foundation. The predecessor of TLS is SSL. Currently, TLS 1.2 is widely used.



TLS performance tuning TLS is widely considered […]

oracle xe backup

ORACLE_BASE=/u01/app/oracle export ORACLE_BASE ORACLE_HOME=/u01/app/oracle/product/11.2.0/xe export ORACLE_HOME ORACLE_SID=XE export ORACLE_SID PATH=$ORACLE_HOME/bin:$PATH export PATH BKUP_DEST=/home/mohan/backups find $BKUP_DEST -name ‘backup*.dmp’ -mtime +10 -exec rm {} \; cd /home/mohan/backups && /u01/app/oracle/product/11.2.0/xe/bin/exp schema/password FILE=backup_`date +’%Y%m%d-%H%M’`.dmp STATISTICS=NONE startup nomount pfile=/u01/app/oracle/product/11.2.0/xe/dbs/initXE.ora / create database maxinstances 1 maxloghistory 2 maxlogfiles 16 maxlogmembers 2 maxdatafiles 30 datafile ‘/u01/app/oracle/oradata/XE/system.dbf’ size 200M reuse autoextend on next […]

 Create additional database in Oracle Express edition 

 Create additional database in Oracle Express edition 

*In my windows i have installed oracle11g express edition i want to create new database for my testing purpose but the express edition doesnot support DBCA utiltiy let us we can discuss How to Create additional database in Oracle Express edition or How to create manual database in […]

How to list all database names in Oracle

1) To view database select * from v$database; 2) To view instance select * from v$instance; 3) To view all users select * from all_users; 4) To view table and columns for a particular user select tc.table_name Table_name ,tc.column_id Column_id ,lower(tc.column_name) Column_name ,lower(tc.data_type) Data_type ,nvl(tc.data_precision,tc.data_length) Length ,lower(tc.data_scale) Data_scale ,tc.nullable nullable FROM all_tab_columns tc ,all_tables t […]

EXP-00002: error in writing to export file

EXP-00002: error in writing to export file While exporting table or schema using exp/imp utility you may come across below error. Most of the time this error occurs due to insufficient space available on disk.so confirm space is available where you are taking taking export dump and re-run export. [oracle@DEV admin]$ exp test/test@DEV tables=t1,t2,t3,t4 file=exp_tables.dmp log=exp_tables.log Export: Release – […]

CentOS 7 Installs Docker Application Container Engine

Docker is an open source application container engine based on the  Go language  and open sourced under the Apache 2.0 protocol.

Docker allows developers to package their applications and dependencies into a lightweight, portable container that can then be published to any popular Linux machine or virtualized.

Containers are completely sandboxed and do not have any […]

Bond Technology Load Balancing in Linux

Problem introduction

When the general enterprise is used to provide NFS service, samba service or vsftpd service, the system must provide 7*24 hours of network transmission service. The maximum network transmission speed it can provide is 100MB/s, but when there are a large number of users accessing, the server’s access pressure is very high, and the […]

centos7 openldap

systemctl stop firewalld.service setenforce 0

sed -i s/^SELINUX=enforcing/SELINUX=disabled/g /etc/selinux/config localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 master.apple.com master slave.apple.com slave client1.apple.com client1 client2.apple.com client2

yum -y install openldap compat-openldap openldap-clients openldap-servers openldap-servers-sql openldap-devel migrationtools vim

cd /etc/openldap/slapd.d

rm -rf

cp /usr/share/openldap-servers/slapd.ldif /root/ldap/

Set OpenLDAP admin password. # generate […]

Backup and Restore Files in Red Hat / CentOS 7

This procedure is to backup XFS-based file systems in Red Hat Enterprise Linux 7.x               Backing up a file system (/etc)

1. To backup the /etc/ filessystem to a file called “/tmp/mybackup”, issue the following command:

# cd /tmp

# xfsdump -0f mybackup   /dev/mapper/rhel-root -s etc


-f: do the dump to the file […]

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