krishnamurthydasari

jmap needs openjdk-debuginfo package. Install and try below command for heap usage

yum list *openjdk-debuginfo* --enablerepo=*
yum install java-1.8.0-openjdk-debuginfo.x86_64 --enablerepo=amzn-updates-debuginfo

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From below output counting all used entries will get actual heap usage. Note that New Generation includes Eden and 1 survivor space. So in provided scripts below i have removed first entry for new generation and considered rest all.


[root@ip-50-1-0-167 jvm]# jmap -heap 13621

krishnamurthydasari

Gitlab Setup:
=============

	Requirements:
	------------
	
	Ruby
	PostgreSQL
	Redis
	Prometheus

krishnamurthydasari

Variables:
==========

1. It can be only one word.
2. It can use only letters, numbers, and the underscore (_) character.
3. It can’t begin with a number.
4. Variables are case-sensitive

Expression - Expressions consist of values (such as 2) and operators (such as +), and they can always evaluate (that is, reduce) down to a single value.

krishnamurthydasari

Amazon Elastic Container Servie: Native Doctor Support on AWS

	User Cases:
		Configuration and deployment
		Microservices
			Breaking application into smaller chunks of code
		Batch Processing
		
	Building block service
	Manage cluster state

krishnamurthydasari

https://openvpn.net/index.php/access-server/docs/quick-start-guide.html#asclient

download package and install
wget http://swupdate.openvpn.org/as/openvpn-as-2.0.21-CentOS6.x86_64.rpm

If you get any errors as below,

Generating init scripts...
Generating init scripts auto command...
Error: Could not generate server script auto.

krishnamurthydasari

Governance - Oversight role and process by which companies manage and mitigate business risks

Compliance - Process and internal controls to meet the requirements imposed by governance body

Governance 

    Define
    Discover
    Monitor
    Respond

krishnamurthydasari

It is always recommended we deploy application across multiple AZs within same VPC instead of deploying in multiple VPCs itself. Below are 2 important points,

1) When you deploy application in two AZs(1a and 1b) in same VPC, AWS will make sure those AZs (1a and 2b) are deployed in 2 separate data centers.
2) When you deploy application in two VPCs
           VPC1 --> AZ 1a
           VPC2 --> AZ 1b

There is no guarantee that 1a from VPC1 and 1b from VPC2 are deployed in separate data centers. It is completely automated process from AWS to pick data center when you select AZ. So possible that both 1a and 1b are deployed on to same physical data center. 

For example, AWS has three AZs in Ireland region (i.e. 3 data centers). so 1a, 1b and 1c not always mapped to fixed data center. For one customer (or VPC) 1a can be data center1 and for other customer it may be 1b for the same data center. 

krishnamurthydasari

Creation of Dx connection

  You need Location details 
  Port speed
  
Creation of VIF:

  You dont need to create VPCs before, or no dependancy with this. You can manage with creating DxGW and later point in time you can create VGW and associate with DxGW
  ASN - This is going to be customer ASN
      - AWS side ASN will be available when you download router configuration

krishnamurthydasari

Basics:
=======

http://kubernetesbyexample.com/

- A replication controller (RC) is a supervisor for long-running pods. An RC will launch a specified number of pods called replicas and makes sure that they keep running, for example when a node fails or something inside of a pod, that is, in one of its containers goes wrong.

example:

kubectl apply -f https://raw.githubusercontent.com/openshift-evangelists/kbe/master/specs/rcs/rc.yaml

krishnamurthydasari

What are containers? 

Containers are completely isolated environments, as in they can have their own processes or services, their own network interfaces, their own mounts, just like Virtual machines, except that they all share the same OS kernel.

What is Orchestrator?

Orchestrator is a platform which enables to control connectivity between containers and automatically scale up or down based on the load. This whole process of automatically deploying and managing containers is known as Container Orchestration.

What is Node?