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How to Mount Amazon EFS in EC2-CentOS Instance

With Amazon EFS(elastic file system)mounted in the EC2, you can signifincalty reudce cost of storge becaues you pay only for the storgrage used by your applications/data. EFS supports NFS

In the AWS console, search for EFS and then create a volume. When you attahce a security group in the EFS, make sure it allows traffc on port 22 from the EC2 instance. Also, take note of the DNS name of  EFS, which will be used to mount the volumen in the EC2.

SSH to the Ec2 and create a mount directory.

sudo mkdir efs

Note:if you want you can specify the full path of the mount directory such as /home/efs or /var/efs [Read more…] about How to Mount Amazon EFS in EC2-CentOS Instance

How to Schedule AWS EC2 Start and stop time using Lambda and Cloudwatch

To save your AWS cloud  operational cost, you can schedule EC2 instanes’ start and stop time using Lambda function.  When you define a lamda function, you need to setup a trigger, which specifies the event that can invoke the lambda fucntions. In this post, we will use the a specific UTC time as a trigger .  For example, you want to start EC2 instances at  06:30 UTC and want to stop the instanes at 20:30 UTC.  [Read more…] about How to Schedule AWS EC2 Start and stop time using Lambda and Cloudwatch

Docker Command List with Examples in Linux

Spinning up a docker container takes a few seconds with a simple command.Once the containers is up and running you need to customize and manage it to fit for the apps and other requirements. I have put together a number of useful command with examples that a beginner will find handy.

Docker MySQL  container installation commands

docker container run -d -p 3306:3306 --name db -e MYSQL_RAMDOM_ROOT_PASSWORD=true mysql

or run

docker container run -d --name db -p 3306:3306 -e MYSQL_ROOT_PASSWORD=mypass mysql

[Read more…] about Docker Command List with Examples in Linux

How to Setup AWS CloudFront for Externally Registered Domain Name

If you do not want to transfer your domain to Amazon DNS(Route 53) and want to use AWS CloudFront to deliver your content, you can use the instructions below to set up your content delivery network.

Scenario 1: you are using an external DNS for CloudFront and do not want to create a hosted zone in  Amazon route 53.

For example, your domain is registered with Namecheap and you have already created a CloudFront distribution for your domain example.com. the easiest solution will be to create a CNAME record in Namecheap DNS and point it to the CloudFront URL.

cname record in namecheap for cloudfront

As you know the CNAME record allows you to only point the subdomain to another domain. You will not be able to send your all traffic from example.com to the CloudFront. Only www.example.com will be forwarded to the CloudFront URL. If you want both the www and non-www or naked/apex domain be forwarded to CloudFront then you need to follow the instruction given below in scenario 2

[Read more…] about How to Setup AWS CloudFront for Externally Registered Domain Name

How to Build High Availability Web Server with GlusterFS on Debian

Scenario- this post aims to help you build a high availability cluster for websites using GlusterFS on Debian server.

In this installation there will two servers-forming a cluster for web contents- that will replicate each other and the third one will be a client server. If you want to add anything in the cluster you have to add it in the client machine, which will be replicated to both the cluster nodes. [Read more…] about How to Build High Availability Web Server with GlusterFS on Debian

9 Advantages and Disadvantages of Cloud Computing for Business

Deciding to move on to a cloud means moving your data into somebody’s computers. To develop your computing facilities without investing in hardware and infrastructure is what cloud computing all about. In an organization, you may be the decision maker thanking about whether to put your data in a third party cloud or in your own cloud. You can have a look at the following advantages and disadvantages of cloud so that you can make an informed decision on whether you should switch over to third party cloud infrastructures. [Read more…] about 9 Advantages and Disadvantages of Cloud Computing for Business

How to Extend Linux LVM by Adding a New Hard Disk

You may need to add new disk to your Linux LVM for various reasons such as for adding capacity for your existing applications or new applications. This post aims to show you how you can add a new disk to your existing LVM as well as to a new LVM. The difference between adding a new disk to a new LVM and to an existing LVM is that in the latter case you do not have to create a new volume group using vgcreate command. [Read more…] about How to Extend Linux LVM by Adding a New Hard Disk

Tips for Foreign Travel Risk Assessment and Management

You may be subject to intelligence espionage while you travel in foreign countries. There can be a number of reasons whey you can be a target. You can be government officials or may be a business person. If the intelligence agency in the foreign country thinks you possess valuable information, you can be a victim. This post helps you identify the clues that may suggest that someone is trying to gather intelligence from you while you are travelling the host country and helps you to mange your travel risk to a mimimum level.

[Read more…] about Tips for Foreign Travel Risk Assessment and Management