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rolling-deployment.md

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Rolling deployment

In this lab you will perform rolling deployment for your autoscaling group.

Helpful commands

Get instance IPs

aws ec2 describe-instances --instance-ids <instance_id> --query 'Reservations[0].Instances[0].PrivateIpAddress'

Get ELB hostname

aws elb describe-load-balancers --load-balancer-names workshop-elb-custom-checks-lb --query 'LoadBalancerDescriptions[0].DNSName'

Lab

Provision a group

ansible-playbook provision-elb-custom-healthcheks-asg-playbook.yml

Verify instance states

aws autoscaling describe-auto-scaling-groups --auto-scaling-group-names workshop-elb-custom-checks-asg --query 'AutoScalingGroups[0].Instances'

Verify ELB state

aws elb describe-instance-health --load-balancer-name workshop-elb-custom-checks-lb

Verify that app is working for each instance and ELB

curl http://<instance_ip>:8080/ping
curl http://<elb_hostname>/ping

Verify that new feature doesn't work

curl http://<elb_hostname>/foo

Check configuration name

aws autoscaling describe-auto-scaling-groups --auto-scaling-group-names workshop-elb-custom-checks-asg --query 'AutoScalingGroups[0].LaunchConfigurationName'

Provision the group again with an updated configuration

ansible-playbook provision-elb-custom-healthcheks-asg-playbook.yml --extra-vars "app_version=0.0.2 lc=new-configuration"

Check configuration name again

aws autoscaling describe-auto-scaling-groups --auto-scaling-group-names workshop-elb-custom-checks-asg --query 'AutoScalingGroups[0].LaunchConfigurationName'

Update the app on the existing instances

export ANSIBLE_HOST_KEY_CHECKING=False
ansible-playbook -u <ssh_user> -i ec2.py --limit tag_aws_autoscaling_groupName_workshop_elb_custom_checks_asg  provision-to-existing-instances-playbook.yml --extra-vars "app_version=0.0.2" --private-key <ssh_key>`

Verify instance states

aws autoscaling describe-auto-scaling-groups --auto-scaling-group-names workshop-elb-custom-checks-asg --query 'AutoScalingGroups[0].Instances'

Verify ELB state

aws elb describe-instance-health --load-balancer-name workshop-elb-custom-checks-lb

Verify that app is working for each instance

curl http://<instance_ip>:8080/ping

Verify that new feature works for each instance

curl http://<instance_ip>:8080/foo

SSH to one of the instances

ssh <ssh_user>@<instance_ip> -i <path_to_key>

Stop the app container

sudo su
docker stop rest

Verify instance states

aws autoscaling describe-auto-scaling-groups --auto-scaling-group-names workshop-elb-custom-checks-asg --query 'AutoScalingGroups[0].Instances'

Verify ELB state

aws elb describe-instance-health --load-balancer-name workshop-elb-custom-checks-lb

Verify that app is working for each instance and ELB

curl http://<instance_ip>:8080/ping
curl http://<elb_hostname>/ping

Verify that new feature works for each instance and ELB

curl http://<instance_ip>:8080/foo
curl http://<elb_hostname>/foo

Clean up

ansible-playbook provision-elb-custom-healthcheks-asg-playbook.yml --extra-vars "state=absent" --tags "asg"
ansible-playbook provision-elb-custom-healthcheks-asg-playbook.yml --extra-vars "state=absent" --tags "lc"
ansible-playbook provision-elb-custom-healthcheks-asg-playbook.yml --extra-vars "state=absent lc=new-configuration" --tags "lc"