Integrating solr with banana in hortonworks

Download and extract banana

https://github.com/lucidworks/banana.git

Copy banana folder to $SOLR_HOME/server/solr-webapp/webapp/

Creating a collection for banana:

banana url:

http://localhost:8886/solr/banana/src/index.html#/dashboard

Postgresql on linux

By default, we will get postgresql on Linux installation

Check for the status of postgresql service as below

Before starting the postgresql service initialize the database as below

Enable the firewall for postgresql as below

Start the service and check for the status as below

Now postgresql is up and running.

Granting permissions for root user to run postgresql

Steps for creating postgresql user:

Change to postgres user and run the below command

$createuser --pwprompt

Give username and password and enter "y" and click enter

Creating postgresql database:

Now we can create postgresql database as a root user as below

Connect to the newly created database as below:

Finding files that use the most disk space in linux

Command to list the top 10 largest directories from the current path

du -sh * | sort -hr | head -n10

Database crashed, unable to connect through sqlplus ; ORA-01012: not logged on ; Oracle Instance alive for sid "orcl"

When trying to start the database getting the below error:

ORA-01012: not logged on

Process ID: 0

Session ID: 0 Serial number: 0

To resolve this exit from the database first

Run SYSRESV Utility as below:

Remove damaged Semaphores and shared memory as below:

Try to connect the database now

Command to unzip all the zip files in a directory in Linux

Below is a directory containing 5 zip files

To extract all the zip files at a time run the below command

#unzip \*.zip

Step by step uninstalling Ambari server

Checking which user is running the Ambari server

ps aux | grep ambari-server

Checking the version of Ambari server installed

rpm -qa | grep ambari

Stopping the Ambari server

Reset the Ambari server












Dropping the schema

Removing the Ambari server

Deleting the Ambari server files and directories

PRVG-0449 : Proper soft limit for maximum stack size was not found on node

Getting the below error when installing oracle database 12c on linux machine

Soft Limit: maximum stack size - This is a prerequisite condition to test whether the soft limit for maximum stack size is set correctly.Details:

PRVG-0449 : Proper soft limit for maximum stack size was not found on node "obia" [Expected >= "10240" ; Found = "8192"]. - Cause: The Cluster Verification Utility determined that the setting for the indicated soft limit did not meet Oracle''s recommendations for proper operation on the indicated nodes. - Action: Modify the resource limits to meet the requirement and take operating system specific measures to ensure that the corrected value takes effect for the current user before retrying this check

Temporary solution:

User limits of system-wide resources available to the shell and to processes started from it, are controlled by "ulimit" command.

To adjust the maximum stack size soft limit use:

1. For the current shell:

# ulimit -Ss 10240

Restart the installation

Permanent solution:

For a permanent setting on any new shell created after editing /etc/security/limits.conf, add line:

oracle soft stack 10240

Save and close the file and restart the installation