Thursday, December 26, 2013

sqlplus: error while loading shared libraries: /u01/app/oracle/product/11.1.0/db_1/lib/libnnz11.so: cannot restore segment prot after reloc: Permission denied

Immediately after a successful RDBMS installation (perhaps even including a sample DB instance creation), sqlplus will not start:
[oracle@test ~]$ sqlplus ‘/as sysdba’
sqlplus: error while loading shared libraries: /u01/app/oracle/product/11.1.0/db_1/lib/libnnz11.so: cannot restore segment prot after reloc: Permission denied
The reason is that SELinux is running in “enforcing” mode.
You can check it on file /etc/pam.d/login
Oracle development has recommended the following workaround while they correct the problem:
Switch SELinux from the default “Enforcing” mode that it is running in, to the “Permissive” mode.
Commands, as root:
======================
getenforce       (returns “Enforcing”)
setenforce 0
getenforce       (returns “Permissive”)
This allows SELinux to continue running, and logging denial messages, but SELinux will not actually deny any operations. Once Development has resolved this issue, you can (and should) return SELinux to the default “Enforcing” mode as follows:
Commands, as root:
======================
setenforce 1
getenforce       (returns “Enforcing”)



SOLUTION

This problem will help on RHEL 5
I simpally run
at root
getenforce
setenforce 0
getenforce

and the problem will solve…..
 
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Sunday, December 22, 2013

How do I download and install 32-bit Java for Linux Platforms?

How do I download and install 32-bit Java for Linux Platforms?

This article applies to:
  • Platform(s): Red Hat Linux, SUSE Linux, Oracle Linux, Oracle Enterprise Linux, SLES
  • Java version(s): 6.0, 7.0
Linux System Requirements
See supported System Configurations for information about supported platforms, operating systems, desktop managers, and browsers.
You will also need a Pentium 166MHz or faster processor with a minimum of 75MB free disk space and a minimum of 64MB of RAM.

Note: For downloading Java other flavors of Linux see Java for Ubuntu, Java for Fedora

Follow these steps to download and install 32- bit Java for Linux.
  1. Download
  2. Install
  3. Enable and Configure
Download
  1. Go to http://java.com and click on the Download button
  2. There are two types of installation packages.
    • Java on Linux Platforms
      This is an archive binary file that can be installed by anyone (not only the root users), in any location that you can write to. However, only the root user can install Java into the system location.
    • Java on RPM-based Linux Platforms
      32-bit RPM-based Linux platforms, such as Red Hat and SuSE, use a RPM binary file (.rpm) in the system location. You must be root to perform this installation.

    Download the package that best suits your needs. You can download the file to any of the directories on your system.
  3. Download and check the download file size to ensure that you have downloaded the full, uncorrupted software bundle. Before you download the file, notice its byte size provided on the download page on the web site. Once the download has completed, compare that file size to the size of the downloaded file to make sure they are equal.
Install
Java for Linux Platforms
 The instructions below are for installing version Java 7 Update 7 (7u7). If you are installing another version, make sure you change the version number appropriately when you type the commands at the terminal. Example: For Java 6u35 replace 7u7 with 6u35. Note that, as in the preceding example, the version number is sometimes preceded with the letter u, and sometimes it is preceded with an underbar, for example, jre1.7.0_07.

  1. Change to the directory in which you want to install. Type:
    cd <directory path name>
    For example, to install the software in the /usr/java/ directory, Type:
    cd /usr/java/

    Note about root access: To install Java in a system-wide location such as /usr/local, you must login as the root user to gain the necessary permissions. If you do not have root access, install the Java in your home directory or a sub directory for which you have write permissions
  2. Move the .tar.gz archive binary to the current directory.
  3. Unpack the tarball and install Java
    tar zxvf jre-7u7-linux-i586.tar.gz

    The Java files are installed in a directory called jre1.7.0_07 in the current directory.
    In this example, it is installed in the /usr/java/jre1.7.0_07 directory.
  4. Delete the .tar.gz file if you want to save disk space.
Java for RPM based Linux Platforms
The instructions below are for installing version Java 7 Update 7 (7u7). If you are installing another version, make sure you change the version number appropriately when you type the commands at the terminal. Example: For Java 6u35 replace 7u7 with 6u35. Note that, as in the preceding example, the version number is sometimes preceded with the letter u, and sometimes it is preceded with an underbar, for example, jre1.7.0_07.

  1. Become root by running su and entering the super-user password.
  2. Uninstall any earlier installations of the Java packages.
    rpm -e <package_name>
  3. Change to the directory in which you want to install. Type:
    cd <directory path name>
    For example, to install the software in the /usr/java/ directory, Type:
    cd /usr/java

  4. Install the package.
    rpm -ivh jre-7u7-linux-i586.rpm

    To upgrade a package,
    rpm -Uvh jre-7u7-linux-i586.rpm

  5. Delete the .rpm file if you want to save disk space.
  6. Exit the root shell. No need to reboot.
 The installation is now complete. Go to the Enable and Configure section.
Enable and Configure
Firefox or Mozilla
To configure the Java Plugin follow these steps:
  1. Exit Firefox browser if it is already running.
  2. Uninstall any previous installations of Java Plugin.
    Only one Java Plugin can be used at a time. When you want to use a different plugin, or version of a plugin, remove the symbolic links to any other versions and create a fresh symbolic link to the new one.
  3. Create a symbolic link to the libnpjp2.so file in the browser plugins directory
    • Go to the plugins sub-directory under the Firefox installation directory
      cd <Firefox installation directory>/plugins
      Create plugins directory if it does not exist.
    • Create the symbolic link
      ln -s <Java installation directory>/lib/i386/libnpjp2.so

    Note: If you are upgrading your Java version then before creating new symbolic link you should remove old symbolic link to enable latest downloaded Java.

    To remove old symbolic link:
    type cd <Firefox installation directory>/plugins
    rm libjavaplugin_oji.so
    Example
    • If Firefox is installed at this directory:
      /usr/lib/<Firefox installation directory>
    • And if the Java is installed at this directory:
      /usr/java/<Java installation directory>
    • Then type in the terminal window to go to the browser plug-in directory:
      /usr/lib/<Firefox installation directory>/plugins
    • Enter the following command to create a symbolic link to the Java Plug-in for the Mozilla browser.
      ln -s /usr/java/<Java installation directory>/lib/i386/libnpjp2.so

  4. Start the Firefox browser, or restart it if it is already up.

    In Firefox, type about:plugins in the Location bar to confirm that the Java Plugin is loaded. You can also click the Tools menu to confirm that Java Console is there.
Test Installation
To test that Java is installed and working properly on your computer, run this test applet.
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