Creating RDS(Relational database) instance

                                              Creating RDS instance in AWS

1.Login to AWS console.

2.Navigate to services --> under database section --> RDS.

    

3. Provide inputs

4. Conform.

How to make one SAP application dialog instance in to passive mode.

About:

This article is all about, how to make one particular SAP application dialog instance in to passive mode.

Case studies of this activity:

• when maintenance activity is going on one particular sap instance.
• during resolving few abap dumps in ST22.

Practical steps:

Step1: login to ABAP server through SAP GUI.

Step2: Access the t-code: SM51.
Step3: perform the below navigation to make one SAP application dialog instance in to passive mode.

                          Goto--> Processes -->state-->Deactivate.

rdisp/tm_max_no

 

Parameter

rdisp/tm_max_no

Short text

Maximum number of possible logons

Parameter Description

This parameter restricts the maximum number of logons per instance. This includes SAP GUI logons, RFC and HTTP logons, and also logons for internal tasks (for example, the execution of background jobs or updates).

Application Area

Dispatcher

Default Value

200

Who is permitted to make changes?

Customer

Operating System Restrictions

None

Database System Restrictions

None

Are other parameters affected or dependent?

None

Values allowed

Whole Number >= 10000

Spot instance

 AWS EC2 spot instances  are using the spare capacity in AWS cloud and provide you EC2 instance at individual requested price.

 At any point of time,AWS can reclaim(terminate ) your instance to the highest bidder with 2 minutes of notification.

you can use AWS EC2 spot instance for machine critical appications.

Do not run critical jobs on EC2 if you can't tolerate failure!.

Hands on:

from the EC2 instance launch page, Navigate to instances --> Spot Requests from the left menu.

Click on Request spot instances.                                                                                                                     

Then the screen prompts to screen where we need to provide all the inputs for spot instance. provide all your inputs based on your requirements.

Finally click on launch.  

Attach new EBS volume to EC2 instance

This post will help you to attach a newly crated EBS to volume to particular EC2 instance.

Note: EBS volumes can attach to EC2 only, if both EC2 and newly created EBS volumes are in same Availability  Zone(AZ).

Here are the practical steps:

From the EC2 console page --> Navigate to Elastic Block Storage --> volumes.

select the newly created EBS volume --> Right click on it --> choose with Attach volume option(as shown below).

Provide instance id (which will obtain in EC2 launch page, instance id id EC2 instance specific).

Device : /dev/sdf or /dev/sdp, based on previously available volume.                                            

Click on Attach.                                                                                                                               

                                Thats all the volume is attached to EC2 instance now.                           

Assigning fixed elastic(public) IP to EC2 instance.

 Usually when you stop and then start an EC2 instance, it can changes its public IP.

if you need to have a fixed public IP for your instance, you need an Elastic IP. An Elastic IP is a public IPv4 IP you own as long as you don't delete it.

Practical steps:

From the EC2 instance launch page, Navigate to Network & Security --> Elastic ips.

Click on Allocate new address now.                                                                                                                          

Click on Allocate.

Then the below pop up screen comes up with public IP. Click on Close.                                                                                          

Then from the Elastic IP page, Select the IP address with check box(1 as highlighted below) --> Actions drop down --> Associate Address.

Provide details:                                                                       

Resource type: instance
Instance : Instance ID
Enter private IP details

Enable the Reassociation check box and Click on Associate button.

Then the below conformation screen appear, Saying Associate address request assigned to EC2 instance successfully.

logs for bootstrap script

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This post will answer following questions:

1. where to check for bootstrap script result logs.

2.if any command in bootstrap script fails, how to find it.

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Bootstrapping means launching commands when machine starts for the very first time.

Navigation for system logs:

1. Right on the EC2 instance from EC2 instance launch page.

2.follow the below highlighted navigation.

3. The resultant screen looks likes the below screen. can use for further reference in case any command in bootstrap script fails.