Raspberry PI static IP setup - Wireless wlan0

1)Edit network card and add ip / broadcast / gateway address

pi@raspberrypi ~ $ cat /etc/network/interfaces
auto lo
iface lo inet loopback

auto eth0
allow-hotplug eth0
iface eth0 inet manual

auto wlan0
allow-hotplug wlan0
iface wlan0 inet static
address 192.168.1.33
netmask 255.255.255.0
broadcast 192.168.1.255
gateway 192.168.1.254
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

auto wlan1
allow-hotplug wlan1
iface wlan1 inet manual
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

pi@raspberrypi ~ $

2) Add wifi router name & password

pi@raspberrypi ~ $ sudo cat  /etc/wpa_supplicant/wpa_supplicant.conf
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
        ssid="hubname"
        psk="password"
        key_mgmt=WPA-PSK
}
pi@raspberrypi ~ $

3)View your ip


pi@raspberrypi ~ $ ifconfig wlan0
wlan0     Link encap:Ethernet  HWaddr
          inet addr:192.168.1.33  Bcast:192.168.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:915 errors:0 dropped:148 overruns:0 frame:0
          TX packets:329 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:202526 (197.7 KiB)  TX bytes:49840 (48.6 KiB)

pi@raspberrypi ~ $

simple google search can fetch lots of results  but this post is for my reference :) ,Today My Raspberry PI2 DAY :)

Tomcat startup script - Tomcat V6/7/8 - Linux

Tomcat startup script :-

Script based  Tomcat lifecycle management is good in Production and test environment,Befor starting  Tomcat server we have to export Tomcat variables in system level

most common varialbes are :-

1)CATALINA_BASE     - Tomcat installation location
2)CATALINA_HOME   - Tomcat instance location if you are running multible instance in same machine .
3)CATALINA_OPTS    - Server scope java options  eg time zone ,language support etc
4)CATALINA_OUT      - Catalina.out file location - jvm output will be store in this file
5)CATALINA_PID        - Tomcat server process id file
6)JAVA_HOME             - Java home
7)JAVA_OPTS              - Java options - JVM options , heapsize ,minimum & maximum memor size , tunning parameters

Sample  bash script which is used to start  owcs 11g  hosted tomcat instance .

startup.sh

#!/bin/sh

FW_UID=11112

if [[ $EUID -ne $FW_UID ]]; then
  echo "This script must be run as  tomcat user"  1>&2
  exit 1
else

CATALINA_OUT=/owcs/logs/dev/editorial/catalina.out
CATALINA_BASE=/owcs/dev/editorial/cs_tomcat
CATALINA_HOME=/owcs/apache-tomcat-6.0.37
CATALINA_PID=/owcs/pids/dev_editorial_pid
JAVA_HOME=/owcs/jdk1.6.0_45
CLASSPATH=$CATALINA_HOME/lib/ojdbc6.jar:$CATALINA_BASE/cs_tomcat/webapps/cs/WEB-INF/lib/MSXML.jar:/owcs/dev/owcs-editorial/bin:$JAVA_HOME/lib/tools.jar
JAVA_OPTS="-Xms2048m -Xmx2048m -Xss512k -Xloggc:/owcs/logs/dev/editorial/verbosegc.$$ -XX:PermSize=512m -XX:MaxPermSize=650m -verbose:gc -XX:+PrintGCTimeStamps -XX:+PrintGCDetails -Duser.timezone=Europe/London -Dcom.sun.management.jmxremote -Dfile.encoding=UTF-8 -Dcs.useJavaURLDecoder=false -Dcs.useEhcache=true -Dnet.sf.ehcache.enableShutdownHook=true -DenableErrorPropagation=true -Djava.library.path=/owcs/dev/owcs-editorial/bin -Djava.awt.headless=true"

export CATALINA_OUT CATALINA_BASE CATALINE_HOME CATALINA_PID JAVA_HOME JAVA_OPTS CLASSPATH

case $1 in
'start')
        exec "$CATALINA_HOME"/bin/catalina.sh start "$@"
        ;;

'stop')
        exec "$CATALINA_HOME"/bin/catalina.sh stop -force "$@"
        ;;

*)
        echo "usage: $0 {start|stop}"
        rval=1
        ;;
esac
fi

Reference :-

http://tomcat.apache.org/tomcat-6.0-doc/index.html

Yum based Docker installation (Redhat EL 6.6 )

Yum based Docker installation :-

Requirements :

1)Redhat linux 6.5 or above
2) EPEL Repository

Procedure :-

1) Download EPEL 6 - 64 bit repository 

#rpm -ivh  http://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm
#yum update
#yum repolist

2) Install docker-io through yum 

#yum -y install docker-io

3) Disable selinux 

#SELINUX=disabled in  /etc/selinux/config file and reboot system

4) Start and enable docker daemon 

#service docker start
#chkconfig docker on
#service docker status

6) Check docker installation - 250 MB download from internet depends on your download speed

# docker run -i -t fedora /bin/bash

Unable to find image 'fedora:latest' locally
fedora:latest: The image you are pulling has been verified

511136ea3c5a: Pull complete
00a0c78eeb6d: Pull complete
834629358fe2: Pull complete
Status: Downloaded newer image for fedora:latest


Reference :-

1) http://docs.docker.com/installation/rhel/

JRockit 1.6 64 bit installation on Redhat Linux 6 64 bit .

In production systems we use JRockit jvm for weblogic application server .

1)Copy bin format jrockit 1.6 installer into your linux box /opt directory .

     scp jrockit-jdk1.6.0_37-R28.2.5-4.1.0-linux-x64.bin root@localhost:/opt 

2)Add execute file permission into installer.

   #chmod +x  jrockit-jdk1.6.0_37-R28.2.5-4.1.0-linux-x64.bin

3)Execute jrokit 1.6 installer .

   #./jrockit-jdk1.6.0_37-R28.2.5-4.1.0-linux-x64.bin

  Follow the wizard  if you want to change installation location you can specify directory location during the installation .

eg: 

<------------------------- Oracle JRockit Installer - Oracle JRockit JDK R28.2.5 for Java SE 6 with JRMC 4.1 ------------------------>

Choose Product Installation Directory:

--------------------------------------

    "Product Installation Directory" = [Enter new value or use default "/root/jrockit-jdk1.6.0_37-R28.2.5-4.1.0"]

     Enter new Product Installation Directory OR [Exit][Previous][Next]> /opt/jrockit1.6.0_37

4)Once installation completed then check jrockit installed directory 

    eg 

      # ll /opt/jrockit1.6.0_37

       total 260

      drwxr-xr-x. 2 root root   4096 Sep 27  2012 bin

      drwxr-xr-x. 3 root root   4096 Sep 24  2012 include

      drwxr-xr-x. 3 root root   4096 Jun  9 14:02 inventory

      drwxr-xr-x. 4 root root   4096 Jun  9 14:02 jre

      drwxr-xr-x. 2 root root   4096 Sep 24  2012 lib

      drwxr-xr-x. 6 root root   4096 Jun  9 14:02 missioncontrol

      -rw-r--r--. 1 root root 239443 Sep 27  2012 THIRDPARTYLICENSEREADME.txt

     

   

Remote Display using ssh - xterm issue

When you try to access remote system display through ssh you may get below error .

$ xterm
xterm Xt error: Can't open display: 
xterm:  DISPLAY is not set

CHECKING REMOTE DISPLAY CONFIGURATION 

$ echo $DISPLAY

CHANGE BELOW VALUES IN THE FILE 

$ VI /etc/ssh/sshd_config 
X11Forwarding yes
X11DisplayOffset 10

RESTART THE SSHD SERVICE

#service sshd restart 

CONNECT REMOTE SERVER 

#ssh -X root@remoteserver.com

TEST X SERVER DISPLAY

#xterm

Linux Simple NFS Sharing (Redhat/Centos/etc..)

This procedures for  simple nfs sharing

Server Side : (192.168.0.1)

1) Install nfs package (nfs,nfs utils,rpcbind are packages are required )
    #yum install nfs*

2) Export nfs sharing folders
    #vi /etc/exports
 
  eg : /nfs folder export to all network with read and write access
               # cat  /etc/exports
                      /nfs *(rw)
3)start the nfs services (nfs using rpcbind port number 2049)

#service rpcbind start
#service nfs start
#chkconfig rpcbind on
#chkconfig nfs on

4)exporting the  shares

   #exportfs -av
 
5)verifying  exports

  #showmount -e localhost
 
Client Side : (192.168.0.2)

  mounting NFS sharing  to local machine 

 
1)create mount directory
   #mkdir /nfs
 
2)installing nfs packages

   #yum install nfs*
 
3)staring the nfs service (first we need to start rpcbind as nfs using rpcbind port number 2049)

   #service rpcbind start
   #service nfs start
   #chkconfig rpcbind on
   #chkconfig nfs on

4)mounting nfs share

  #mount -t nfs 192.168.0.1:/nfs  /nfs

5)check the mount points

  #mount  
  

WLST access using key files

1) connect the server and store the user credentials as a key file

             connect("weblogic","Webl0gic","t3://192.168.1.10")
             storeUserConfig('/opt/oracle/user.config','/opt/oracle/user.key')

2) example to  connect the server  using key files

connect(userConfigFile='/opt/oracle/user.config',userKeyFile='/opt/oracle/user.key',url='t3://192.168.1.10')