Consider a use case where you have 20 instances and you want to deploy your code or change the configuration file of these instances. The only solution would be to login into each particular instance and then changing the configuration file.\u00a0AWS CodeDeploy\u00a0<\/strong>lets you do this in just few steps . You just create a deploy application and your code will be deployed in all these 20 instances.<\/p>\n Deploying code without using AWS\u00a0CodeDeploy<\/p><\/div>\n <\/p>\n <\/p>\n Deploying code using AWS CodeDeploy<\/p><\/div>\n There are two ways to deploy code in\u00a0Amazon Web Services:-<\/p>\n Here, we will deploy the code using Amazon S3 service. Let us also understand few\u00a0useful terms which will be used in the deployment process:<\/p>\n <\/p>\n Deploying Code Using AWS S3<\/strong><\/span><\/p>\n We’ll take a simple example to deploy the code using S3. We are deploying the code in a single instance and are launching a single\u00a0t2.micro\u00a0<\/strong>instance. Launch the instance and install nginx<\/a> in it as we are going to change the front page or index.html of the nginx default configuration. You can install nginx by logging into the instance and typing the following commands: sudo apt-get update sudo apt-get install nginx -y<\/p>\n <\/p>\n Before starting with CodeDeploy, we need to have :-<\/p>\n <\/p>\n <\/p>\n [js] <\/p>\n [js]<\/p>\n { [\/js]<\/p>\n <\/p>\n [js]<\/p>\n { [\/js]<\/p>\n We also need to install AWS CodeDeploy Client <\/strong>to our instance. It will allow the code to be deployed into the instance. You can install the code-deploy client onto your instance by the following process:<\/p>\n [js]<\/p>\n sudo apt-get update [\/js]<\/p>\n <\/p>\n AppSpec is the heart of CodeDeploy and is written in YAML. AppSpec defines how the application code will be deployed on deployment targets and which\u00a0deployment lifecycle event hooks to run in response to various deployment lifecycle events. It should be in the root of an application source code\u2019s directory structure.<\/p>\n High Level Structure of AppSpec File:<\/p>\n![\"Deploying](\"\/blog\/wp-ttn-blog\/uploads\/2015\/03\/Code-Deploy.jpg\")
<\/a>![\"Deploying](\"\/blog\/wp-ttn-blog\/uploads\/2015\/03\/Code-Deploy-1.jpg\")
<\/a>\n
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Now lets move towards Code Deploy into an instance<\/strong><\/em><\/span><\/h3>\n
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<\/h3>\n
IAM Role Given to AWS CodeDeploy to access your EC2-instance<\/h3>\n
\n{
\n"Version": "2012-10-17",
\n "Statement": [
\n {
\n "Action": [
\n "autoscaling:PutLifecycleHook",
\n "autoscaling:DeleteLifecycleHook",
\n "autoscaling:RecordLifecycleActionHeartbeat",
\n "autoscaling:CompleteLifecycleAction",
\n "autoscaling:DescribeAutoscalingGroups",
\n "autoscaling:PutInstanceInStandby",
\n "autoscaling:PutInstanceInService",
\n "ec2:Describe*"
\n ],
\n "Effect": "Allow",
\n "Resource": "*"
\n }
\n ]
\n }
\n[\/js]<\/p>\n<\/div>\nIAM Role Given to EC2-instances to access S3 Buckets<\/h3>\n
\n"Version": "2012-10-17",
\n"Statement":
\n [
\n {
\n "Action":
\n [
\n "s3:Get*",
\n "s3:List*"
\n ],
\n "Effect": "Allow",
\n "Resource": "*"
\n }
\n ]
\n}<\/p>\nTrusted Relationship With AWS CodeDeploy IAM Role<\/h3>\n
\n\u201cVersion\u201d: \u201c2012-10-17\u2033,
\n\u201cStatement\u201d: [
\n {
\n \u201cSid\u201d: \u201c\u201d,
\n \u201cEffect\u201d: \u201cAllow\u201d,
\n \u201cPrincipal\u201d: {
\n \u201cService\u201d:
\n [
\n "codedeploy.us-east-1.amazonaws.com",
\n "codedeploy.us-west-2.amazonaws.com"
\n ]
\n },
\n \u201cAction\u201d: \u201csts:AssumeRole\u201d
\n }
\n ]
\n}<\/p>\nInstalling AWS CLI and AWS CodeDeploy Agent on Ubuntu 14.04 LTS :<\/h3>\n
\nsudo apt-get install awscli
\nsudo apt-get install ruby2.0
\ncd \/home\/ubuntu
\nsudo aws s3 cp s3:\/\/aws-codedeploy-us-east-1\/latest\/install . –region us-east-1
\nsudo chmod +x .\/install
\nsudo .\/install auto<\/p>\nUnderstanding APPSPEC FILE<\/strong><\/span><\/h3>\n
![\"Selection_005\"](\"\/blog\/wp-ttn-blog\/uploads\/2015\/03\/Selection_005.png\")
<\/a><\/p>\n![\"Selection_004\"](\"\/blog\/wp-ttn-blog\/uploads\/2015\/03\/Selection_004.png\")
<\/a><\/p>\n![\"Selection_006\"](\"\/blog\/wp-ttn-blog\/uploads\/2015\/03\/Selection_006.png\")
<\/a>![\"Selection_007\"](\"\/blog\/wp-ttn-blog\/uploads\/2015\/03\/Selection_007.png\")
<\/a>![\"Selection_008\"](\"\/blog\/wp-ttn-blog\/uploads\/2015\/03\/Selection_008.png\")
<\/a><\/p>\n![\"Selection_010\"](\"\/blog\/wp-ttn-blog\/uploads\/2015\/03\/Selection_010.png\")
<\/a><\/p>\n![\"Selection_013\"](\"\/blog\/wp-ttn-blog\/uploads\/2015\/03\/Selection_013.png\")
<\/a><\/p>\n![\"Selection_012\"](\"\/blog\/wp-ttn-blog\/uploads\/2015\/03\/Selection_012.png\")
<\/a> \u00a0 ![\"Selection_014\"](\"\/blog\/wp-ttn-blog\/uploads\/2015\/03\/Selection_014.png\")
<\/a><\/p>\n