GCP Classroom Series – 24/Feb/2021

Google Compute Engine

• This is a service that provides vms that run on GCP. Vms that run on GCP are referred as instances
• Hypervisor:
  • This is a software that creates and runs Virtual Machines(VMs)
  • There are two types of Hypervisors
    • Type 1 ("Bare metal"):
      • This acts like a light weight os that runs directly on hosts hardware
      • Example: VM Ware esxi
    • Type 2 ("Hosted"):
      • This runs as a software layer on operating system
      • Examples: Virtual Box, Vmware workstation etc
• Cloud Hypervisor:
  • Thse hypervisors emerged as tool for running virtual machines and driving innovation in a cloud environment
• On GCE when we want to create a vm the following image shows alloaction of vm on some physical server in a Zone
• Every VM needs to have some kind of OS, So for the vm which we are creating the operationg system , libraries etc are chosen by Google Virtual Machine Images.
• You may choose to use
  • public images provided by google
  • Market Place images provided by third-party vendors
  • Create your own images
• Virtual Machine instance which we create should be part of some vpc and subnet. A NIC is created that connects vm to subnet. A VM by default gets external ip address and internal ip address
• Who can access vm depends on Firewall rules associated with the vm
• So lets create a Ubuntu VM in default vpc in us-central1 Region and zone b.
• Lets create a firewall rule to allow all the ports inbound
• Login into the vm from console
• Create a new user called as qtdevops with password qtdevops
• Enable password authentication
  • edit the Password Authentication to yes in /etc/ssh/sshd_config
  • restart sshd service sudo service sshd restart
• Give Sudo permissions to qtdevops
• Now try to login from your workstation(laptop) as qtdevops user
• Now lets install apache server on this instance
• Now lets try to install tomcat

sudo yum install tomcat
sudo service tomcat start

• Exercise: Try creating a ubuntu vm and install apache and tomcat and try to access both by external ip