MySQL gets killed , no error logs linux - SOLVED swap usage

We were wondering once when MySQL server process used to get killed automatically with the below indication in /var/lib/mysql/ err log - 

140826 12:12:26 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
140826 12:12:27 mysqld_safe mysqld from pid file /var/lib/mysql/shareolite.pid ended

There was absolutely no indication on whatsoever was the cause.

Finally , on brain storming we observed , the SWAP memory was fully used up which was the culprit

$ free -m

             total       used       free     shared    buffers     cached

Mem:          3830       3686        144          0        167       2381

-/+ buffers/cache:       1136       2694

Swap:         2047       2043          4

Once we rebooted the system to recover the used swap , mysql server startup was normal and continued to function normally.

 

 

Hope this tips helps to some !!

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Linux Command line Search and Install perl modules from CPAN

Did you know that , perl modules may be directly installed from CPAN website. Only requirement is you have a active internet connection. In this post we show few commands which may be used on a linux system to search & download perl modules from CPAN website. This tool has an advantage that it downloads the necessary dependencies & installs them. 

 

 

Step 1 : Login to the CPAN linux prompt

[shareolite@labserver 00:25:44 shareolite]$ perl -MCPAN -e shell

cpan shell -- CPAN exploration and modules installation (v1.59_54)
ReadLine support available (try 'install Bundle::CPAN')

cpan>

Step 2 : Search for the required module , For example *Excel*

cpan> i /Excel/


Module          XML::Excel      (I/IS/ISTERIN/XML-Excel-0.02.tar.gz)
Module          XML::SAXDriver::Excel (I/IS/ISTERIN/XML-SAXDriver-Excel-0.06.tar.gz)
Module          Xymon::Server::ExcelOutages (D/DA/DAVIDP/Xymon-Server-ExcelOutages-0.03.tar.gz)


Step 3 : Select the module from the list and install 

cpan> install XML::Excel
Running install for module XML::Excel
Running make for I/IS/ISTERIN/XML-Excel-0.02.tar.gz
Fetching with LWP:
  http://perlmirror.indialinks.com/authors/id/I/IS/ISTERIN/XML-Excel-0.02.tar.gz

  CPAN: MD5 security checks disabled because MD5 not installed.
  Please consider installing the MD5 module.

Scanning cache /home/shareolite/.cpan/build for sizes
XML-Excel-0.02/CHANGES
XML-Excel-0.02/Data1.xls
XML-Excel-0.02/Data2.xls
XML-Excel-0.02/Excel.pm
XML-Excel-0.02/MANIFEST
XML-Excel-0.02/Makefile.PL
XML-Excel-0.02/README
XML-Excel-0.02/test.pl

  CPAN.pm: Going to build I/IS/ISTERIN/XML-Excel-0.02.tar.gz

Checking if your kit is complete...
Looks good
Warning: prerequisite Spreadsheet::ParseExcel failed to load: Can't locate Spreadsheet/ParseExcel.pm in @INC (@INC contains: /usr/lib/perl5/5.6.1/i386-linux /usr/lib/perl5/5.6.1 /usr/lib/perl5/site_perl/5.6.1/i386-linux /usr/lib/perl5/site_perl/5.6.1 /usr/lib/perl5/site_perl/5.6.0 /usr/lib/perl5/site_perl /usr/lib/perl5/vendor_perl/5.6.1/i386-linux /usr/lib/perl5/vendor_perl/5.6.1 /usr/lib/perl5/vendor_perl .) at (eval 4) line 3.
Writing Makefile for XML::Excel
---- Unsatisfied dependencies detected during [I/IS/ISTERIN/XML-Excel-0.02.tar.gz] -----
    Spreadsheet::ParseExcel
Shall I follow them and prepend them to the queue
of modules we are processing right now? [yes]

Hope this helps to some linux perl geeks.

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Install Oracle linux command line silent mode

Installing oracle application software & database through command line in Linux: ( silent mode )

This may be useful when server console / Xwindows access is not available. Sample response file configuration for Standard Edition installation is provided for usage reference. Hope this helps to some geeks.

Procedure:

• Untar the database installation tar file , this will usually create a directory "database"
• Execute oracle  pre-installation procedure i.e, creating oracle user, groups , setting sysctl parameters etc

Edit the db_install.rsp response file as per requirement and execute the runInstaller executable in silent mode as mentioned below.

 ./runInstaller -silent -responseFile /home/oracle/database/response/db_install.rsp


####################################################################
## Copyright(c) Oracle Corporation 1998,2008. All rights reserved.##
##                                                                ##
## Specify values for the variables listed below to customize     ##
## your installation.                                             ##
##                                                                ##
## Each variable is associated with a comment. The comment        ##
## can help to populate the variables with the appropriate        ##
## values.  ##
##                                                                ##
## IMPORTANT NOTE: This file contains plain text passwords and    ##
## should be secured to have read permission only by oracle user  ##
## or db administrator who owns this installation.                ##
##                                                                ##
####################################################################

#------------------------------------------------------------------------------
# Do not change the following system generated value. 
#------------------------------------------------------------------------------
oracle.install.responseFileVersion=/oracle/install/rspfmt_dbinstall_response_schema_v11_2_0

#------------------------------------------------------------------------------
# Specify the installation option.
# It can be one of the following:
# 1. INSTALL_DB_SWONLY
# 2. INSTALL_DB_AND_CONFIG
# 3. UPGRADE_DB
#-------------------------------------------------------------------------------
oracle.install.option=INSTALL_DB_AND_CONFIG

#-------------------------------------------------------------------------------
# Specify the hostname of the system as set during the install. It can be used
# to force the installation to use an alternative hostname rather than using the
# first hostname found on the system. (e.g., for systems with multiple hostnames 
# and network interfaces)
#-------------------------------------------------------------------------------
ORACLE_HOSTNAME=shareoliteblog.com

#-------------------------------------------------------------------------------
# Specify the Unix group to be set for the inventory directory.  
#-------------------------------------------------------------------------------
UNIX_GROUP_NAME=oinstall

#-------------------------------------------------------------------------------
# Specify the location which holds the inventory files.
#-------------------------------------------------------------------------------
INVENTORY_LOCATION=/home/oracle/oraInventory

#-------------------------------------------------------------------------------
# Specify the languages in which the components will be installed.             
#
# en   : English                  ja   : Japanese                  
# fr   : French                   ko   : Korean                    
# ar   : Arabic                   es   : Latin American Spanish    
# bn   : Bengali                  lv   : Latvian                   
# pt_BR: Brazilian Portuguese     lt   : Lithuanian                
# bg   : Bulgarian                ms   : Malay                     
# fr_CA: Canadian French          es_MX: Mexican Spanish           
# ca   : Catalan                  no   : Norwegian                 
# hr   : Croatian                 pl   : Polish                    
# cs   : Czech                    pt   : Portuguese                
# da   : Danish                   ro   : Romanian                  
# nl   : Dutch                    ru   : Russian                   
# ar_EG: Egyptian                 zh_CN: Simplified Chinese        
# en_GB: English (Great Britain)  sk   : Slovak                    
# et   : Estonian                 sl   : Slovenian                 
# fi   : Finnish                  es_ES: Spanish                   
# de   : German                   sv   : Swedish                   
# el   : Greek                    th   : Thai                      
# iw   : Hebrew                   zh_TW: Traditional Chinese       
# hu   : Hungarian                tr   : Turkish                   
# is   : Icelandic                uk   : Ukrainian                 
# in   : Indonesian               vi   : Vietnamese                
# it   : Italian                                                   
#
# Example : SELECTED_LANGUAGES=en,fr,ja
#------------------------------------------------------------------------------
SELECTED_LANGUAGES=en

#------------------------------------------------------------------------------
# Specify the complete path of the Oracle Home.
#------------------------------------------------------------------------------
ORACLE_HOME=/opt/oracle/product/11.2.0/db_1

#------------------------------------------------------------------------------
# Specify the complete path of the Oracle Base. 
#------------------------------------------------------------------------------
ORACLE_BASE=/opt/oracle

#------------------------------------------------------------------------------
# Specify the installation edition of the component.                        
#                                                             
# The value should contain only one of these choices.        
# EE     : Enterprise Edition                                
# SE     : Standard Edition                                  
# SEONE  : Standard Edition One
# PE     : Personal Edition (WINDOWS ONLY)
#------------------------------------------------------------------------------
oracle.install.db.InstallEdition=SE

#------------------------------------------------------------------------------
# This variable is used to enable or disable custom install.
#
# true  : Components mentioned as part of 'customComponents' property
#         are considered for install.
# false : Value for 'customComponents' is not considered.
#------------------------------------------------------------------------------
oracle.install.db.isCustomInstall=true

#------------------------------------------------------------------------------
# This variable is considered only if 'IsCustomInstall' is set to true. 
#
# Description: List of Enterprise Edition Options you would like to install.
#
#              The following choices are available. You may specify any
#              combination of these choices.  The components you choose should
#              be specified in the form "internal-component-name:version"
#              Below is a list of components you may specify to install.
#        
#              oracle.rdbms.partitioning:11.2.0.1.0 - Oracle Partitioning
#              oracle.rdbms.dm:11.2.0.1.0 - Oracle Data Mining
#              oracle.rdbms.dv:11.2.0.1.0 - Oracle Database Vault 
#              oracle.rdbms.lbac:11.2.0.1.0 - Oracle Label Security
#              oracle.rdbms.rat:11.2.0.1.0 - Oracle Real Application Testing 
#              oracle.oraolap:11.2.0.1.0 - Oracle OLAP
#------------------------------------------------------------------------------
oracle.install.db.customComponents=oracle.server:11.2.0.1.0,oracle.sysman.ccr:10.2.7.0.0,oracle.xdk:11.2.0.1.0,oracle.rdbms.oci:11.2.0.1.0,oracle.network:11.2.0.1.0,oracle.network.listener:11.2.0.1.0,oracle.rdbms:11.2.0.1.0,oracle.options:11.2.0.1.0,oracle.rdbms.partitioning:11.2.0.1.0,oracle.oraolap:11.2.0.1.0,oracle.rdbms.dm:11.2.0.1.0,oracle.rdbms.dv:11.2.0.1.0,orcle.rdbms.lbac:11.2.0.1.0,oracle.rdbms.rat:11.2.0.1.0

###############################################################################
#                                                                             #
# PRIVILEGED OPERATING SYSTEM GROUPS                                        #
# ------------------------------------------                                  #
# Provide values for the OS groups to which OSDBA and OSOPER privileges       #
# needs to be granted. If the install is being performed as a member of the   #
# group "dba", then that will be used unless specified otherwise below.      #
#                                                                             #
###############################################################################

#------------------------------------------------------------------------------
# The DBA_GROUP is the OS group which is to be granted OSDBA privileges.
#------------------------------------------------------------------------------
oracle.install.db.DBA_GROUP=dba

#------------------------------------------------------------------------------
# The OPER_GROUP is the OS group which is to be granted OSOPER privileges.
#------------------------------------------------------------------------------
oracle.install.db.OPER_GROUP=oinstall

#------------------------------------------------------------------------------
# Specify the cluster node names selected during the installation.
#------------------------------------------------------------------------------
oracle.install.db.CLUSTER_NODES=

#------------------------------------------------------------------------------
# Specify the type of database to create.
# It can be one of the following:
# - GENERAL_PURPOSE/TRANSACTION_PROCESSING          
# - DATA_WAREHOUSE                                
#------------------------------------------------------------------------------
oracle.install.db.config.starterdb.type=GENERAL_PURPOSE

#------------------------------------------------------------------------------
# Specify the Starter Database Global Database Name. 
#------------------------------------------------------------------------------
oracle.install.db.config.starterdb.globalDBName=ORA1.shareolitelab.com

#------------------------------------------------------------------------------
# Specify the Starter Database SID.
#------------------------------------------------------------------------------
oracle.install.db.config.starterdb.SID=ORA1

#------------------------------------------------------------------------------
# Specify the Starter Database character set.
#                                              
# It can be one of the following:
# AL32UTF8, WE8ISO8859P15, WE8MSWIN1252, EE8ISO8859P2,
# EE8MSWIN1250, NE8ISO8859P10, NEE8ISO8859P4, BLT8MSWIN1257,
# BLT8ISO8859P13, CL8ISO8859P5, CL8MSWIN1251, AR8ISO8859P6,
# AR8MSWIN1256, EL8ISO8859P7, EL8MSWIN1253, IW8ISO8859P8,
# IW8MSWIN1255, JA16EUC, JA16EUCTILDE, JA16SJIS, JA16SJISTILDE,
# KO16MSWIN949, ZHS16GBK, TH8TISASCII, ZHT32EUC, ZHT16MSWIN950,
# ZHT16HKSCS, WE8ISO8859P9, TR8MSWIN1254, VN8MSWIN1258
#------------------------------------------------------------------------------
oracle.install.db.config.starterdb.characterSet=AL32UTF8

#------------------------------------------------------------------------------
# This variable should be set to true if Automatic Memory Management 
# in Database is desired.
# If Automatic Memory Management is not desired, and memory allocation
# is to be done manually, then set it to false.
#------------------------------------------------------------------------------
oracle.install.db.config.starterdb.memoryOption=true

#------------------------------------------------------------------------------
# Specify the total memory allocation for the database. Value(in MB) should be
# at least 256 MB, and should not exceed the total physical memory available 
# on the system.
# Example: oracle.install.db.config.starterdb.memoryLimit=512
#------------------------------------------------------------------------------
oracle.install.db.config.starterdb.memoryLimit=256

#------------------------------------------------------------------------------
# This variable controls whether to load Example Schemas onto the starter
# database or not.
#------------------------------------------------------------------------------
oracle.install.db.config.starterdb.installExampleSchemas=false

#------------------------------------------------------------------------------
# This variable includes enabling audit settings, configuring password profiles
# and revoking some grants to public. These settings are provided by default. 
# These settings may also be disabled.    
#------------------------------------------------------------------------------
oracle.install.db.config.starterdb.enableSecuritySettings=true

###############################################################################
#                                                                             #
# Passwords can be supplied for the following four schemas in the      #
# starter database:            #
#   SYS                                                                       #
#   SYSTEM                                                                    #
#   SYSMAN (used by Enterprise Manager)                                       #
#   DBSNMP (used by Enterprise Manager)                                       #
#                                                                             #
# Same password can be used for all accounts (not recommended)      #
# or different passwords for each account can be provided (recommended)       #
#                                                                             #
###############################################################################

#------------------------------------------------------------------------------
# This variable holds the password that is to be used for all schemas in the
# starter database.
#-------------------------------------------------------------------------------
oracle.install.db.config.starterdb.password.ALL=oracle

#-------------------------------------------------------------------------------
# Specify the SYS password for the starter database.
#-------------------------------------------------------------------------------
oracle.install.db.config.starterdb.password.SYS=oracle

#-------------------------------------------------------------------------------
# Specify the SYSTEM password for the starter database.
#-------------------------------------------------------------------------------
oracle.install.db.config.starterdb.password.SYSTEM=oracle

#-------------------------------------------------------------------------------
# Specify the SYSMAN password for the starter database.
#-------------------------------------------------------------------------------
oracle.install.db.config.starterdb.password.SYSMAN=oracle

#-------------------------------------------------------------------------------
# Specify the DBSNMP password for the starter database.
#-------------------------------------------------------------------------------
oracle.install.db.config.starterdb.password.DBSNMP=oracle

#-------------------------------------------------------------------------------
# Specify the management option to be selected for the starter database. 
# It can be one of the following:
# 1. GRID_CONTROL
# 2. DB_CONTROL
#-------------------------------------------------------------------------------
oracle.install.db.config.starterdb.control=

#-------------------------------------------------------------------------------
# Specify the Management Service to use if Grid Control is selected to manage 
# the database.      
#-------------------------------------------------------------------------------
oracle.install.db.config.starterdb.gridcontrol.gridControlServiceURL=

#-------------------------------------------------------------------------------
# This variable indicates whether to receive email notification for critical 
# alerts when using DB control.   
#-------------------------------------------------------------------------------
oracle.install.db.config.starterdb.dbcontrol.enableEmailNotification=false

#-------------------------------------------------------------------------------
# Specify the email address to which the notifications are to be sent.
#-------------------------------------------------------------------------------
oracle.install.db.config.starterdb.dbcontrol.emailAddress=shareolite@gmail.com

#-------------------------------------------------------------------------------
# Specify the SMTP server used for email notifications.
#-------------------------------------------------------------------------------
oracle.install.db.config.starterdb.dbcontrol.SMTPServer=shareolite.in


###############################################################################
#                                                                             #
# SPECIFY BACKUP AND RECOVERY OPTIONS                                      #
# ------------------------------------                              #
# Out-of-box backup and recovery options for the database can be mentioned    #
# using the entries below.      #
#                                                                             #
###############################################################################

#------------------------------------------------------------------------------
# This variable is to be set to false if automated backup is not required. Else 
# this can be set to true.
#------------------------------------------------------------------------------
oracle.install.db.config.starterdb.automatedBackup.enable=false

#------------------------------------------------------------------------------
# Regardless of the type of storage that is chosen for backup and recovery, if 
# automated backups are enabled, a job will be scheduled to run daily at
# 2:00 AM to backup the database. This job will run as the operating system 
# user that is specified in this variable.
#------------------------------------------------------------------------------
oracle.install.db.config.starterdb.automatedBackup.osuid=

#-------------------------------------------------------------------------------
# Regardless of the type of storage that is chosen for backup and recovery, if 
# automated backups are enabled, a job will be scheduled to run daily at
# 2:00 AM to backup the database. This job will run as the operating system user
# specified by the above entry. The following entry stores the password for the
# above operating system user.
#-------------------------------------------------------------------------------
oracle.install.db.config.starterdb.automatedBackup.ospwd=

#-------------------------------------------------------------------------------
# Specify the type of storage to use for the database.
# It can be one of the following:
# - FILE_SYSTEM_STORAGE
# - ASM_STORAGE
#------------------------------------------------------------------------------
oracle.install.db.config.starterdb.storageType=FILE_SYSTEM_STORAGE

#-------------------------------------------------------------------------------
# Specify the database file location which is a directory for datafiles, control
# files, redo logs.         
#
# Applicable only when oracle.install.db.config.starterdb.storage=FILE_SYSTEM 
#-------------------------------------------------------------------------------
oracle.install.db.config.starterdb.fileSystemStorage.dataLocation=/opt/oracle/oradata

#-------------------------------------------------------------------------------
# Specify the backup and recovery location.
#
# Applicable only when oracle.install.db.config.starterdb.storage=FILE_SYSTEM 
#-------------------------------------------------------------------------------
oracle.install.db.config.starterdb.fileSystemStorage.recoveryLocation=

#-------------------------------------------------------------------------------
# Specify the existing ASM disk groups to be used for storage.
#
# Applicable only when oracle.install.db.config.starterdb.storage=ASM
#-------------------------------------------------------------------------------
oracle.install.db.config.asm.diskGroup=

#-------------------------------------------------------------------------------
# Specify the password for ASMSNMP user of the ASM instance.                  
#
# Applicable only when oracle.install.db.config.starterdb.storage=ASM_SYSTEM 
#-------------------------------------------------------------------------------
oracle.install.db.config.asm.ASMSNMPPassword=oracle

#------------------------------------------------------------------------------
# Specify the My Oracle Support Account Username.
#
#  Example   : MYORACLESUPPORT_USERNAME=metalink
#------------------------------------------------------------------------------
MYORACLESUPPORT_USERNAME=

#------------------------------------------------------------------------------
# Specify the My Oracle Support Account Username password.
#
# Example    : MYORACLESUPPORT_PASSWORD=password
#------------------------------------------------------------------------------
MYORACLESUPPORT_PASSWORD=

#------------------------------------------------------------------------------
# Specify whether to enable the user to set the password for
# My Oracle Support credentials. The value can be either true or false.
# If left blank it will be assumed to be false.
#
# Example    : SECURITY_UPDATES_VIA_MYORACLESUPPORT=true
#------------------------------------------------------------------------------
SECURITY_UPDATES_VIA_MYORACLESUPPORT=

#------------------------------------------------------------------------------
# Specify whether user wants to give any proxy details for connection. 
# The value can be either true or false. If left blank it will be assumed
# to be false.
#
# Example    : DECLINE_SECURITY_UPDATES=false
#------------------------------------------------------------------------------
DECLINE_SECURITY_UPDATES=true

#------------------------------------------------------------------------------
# Specify the Proxy server name. Length should be greater than zero.
#
# Example    : PROXY_HOST=proxy.domain.com 
#------------------------------------------------------------------------------
PROXY_HOST=

#------------------------------------------------------------------------------
# Specify the proxy port number. Should be Numeric and atleast 2 chars.
#
# Example    : PROXY_PORT=25 
#------------------------------------------------------------------------------
PROXY_PORT=

#------------------------------------------------------------------------------
# Specify the proxy user name. Leave PROXY_USER and PROXY_PWD 
# blank if your proxy server requires no authentication.
#
# Example    : PROXY_USER=username 
#------------------------------------------------------------------------------
PROXY_USER=

#------------------------------------------------------------------------------
# Specify the proxy password. Leave PROXY_USER and PROXY_PWD  
# blank if your proxy server requires no authentication.
#
# Example    : PROXY_PWD=password 
#------------------------------------------------------------------------------
PROXY_PWD=

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Timestamp in linux History command - SOLVED

By setting the the parameter HISTTIMEFORMAT in .bashrc script under a linux user, timestamp can be appended to each command executed by the user in .bash_history file.

 

 

Add the below line in .bashrc file of a OS user.

export HISTTIMEFORMAT="%Y-%m-%d %H:%M:%S "

Sample command history output

 1002  2014-08-06 22:41:56 hello
 1003  2014-08-06 22:41:57 history
 1004  2014-08-06 22:42:04 who am i
 1005  2014-08-06 22:42:09 who
 1006  2014-08-06 22:42:11 who am
 1007  2014-08-06 22:42:13 who am i
 1008  2014-08-06 22:42:16 whoami
 1009  2014-08-06 22:42:21 history

Hope this helps to some linux geeks.

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Apache Tomcat Enable Access logs - SOLVED

 

 

For enabling access logs in Apache tomcat web server , following lines need to be un-commented in server.xml configuration file and restart the server process.

 <Valve className="org.apache.catalina.valves.AccessLogValve"
                 directory="logs"  prefix="localhost_access_log." suffix=".txt"
                 pattern="common" resolveHosts="false"/>


Logs with file name "localhost_access_log.<date>" will be generated under Tomcat logs directory everyday.

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