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Linux Interview Questions
Tech Level 1
* One or more ways to add a user to a group.
* Reconfigure hostname
* Determine networking information
* Create a virtual interface?
* Define new resolver
* Outgoing mail relay
* Determine operating system version
* How do you get the network path from here to there?
* What service listens on udp/53?
 
Tech Level 2
* Bonding configuration
* VLAN configuration
* Static routes
* In scripting language, how to get the value of the third command line argument
* In scripting language, determine if a variable is not a null value
* LVM resize volume
* Custom binary needs to know about a custom built library shared object. How to make it "visible?"
* Determine if a daemon is listening on a port?
* Disk reports full despite showing free space. What has happened and how could it be avoided?
* Linux shows I have 500k ram free! Why is this not an emergency?
* RPM refuses to install because it says it's already installed, but I know it isn't.
* What is the standard port for an Oracle Listener process?
* What is the standard port for MySQL to listen on?
* What service(s) must be running for NFS filesystems to function?
* If I wanted to give specific access to certain machines for certain services, what files would I look at?
* How to disable SELinux?
* How to disable IPTables?
* Describe the Linux boot sequence, from power button to login prompt.  Explain what happens at each step.
Tech Level 3
* Identify the objects that have been mapped into memory by a running binary
* Identify what a hung or out of control process is doing
* Identify what vlans/traffic an interface can see
* Recommended kernel tuning for high performance web servers
* Change IO elevator schedulers
* Kickstart recipe section that allows custom scripts to be run after the installer finishes
* NUMA cell identification
* Identify the command line arguments a process was started with when it does not show in the process list
* X86 processors: why is node interleaving good? why is it bad?
* How to break into a mysql database when you've lost the login credentials?
* How do you disable certain hardware functions of a network card?
* For a headless server, how do you get console output?
* What has to run for active/active or active/passive links to work properly?

Vmware Interview Questions
Tech Level 1

1. How do I enable SSH on ESXi?
2. If I wanted to patch ESXi how could I do that?
3. What are some benefits of virtualization?
4. How do you add a network to a VM?

Tech Level 2

1. Which port does the VMware console listen on?
2. What is the difference between a VMware template and a virtual machine?
3. What is the vswap file for?
4. Why use a VDS switch over a vSwitch?
5. Id like to manage all of my ESXi servers with a single vCenter. I have ESXi 3.5 U5, 4.1, 5.0 and 5.5 hypervisors. What version of vCenter do I need?
6. What is Autodeploy? Why would I use it?
7. What are some utilities I can use to troubleshoot performance issues?
8. If my vCenter server machine goes down and I am using VDS switches how does this impact my VM networks?
9. I cannot mount my NFS volume. Help me troubleshoot why.
10. How does HA work?

Tech Level 3

1. What are some benefits for storing VM swap files on different datastore than the VMDK files.
2. If I need to add a specific port to the ESXi firewall how would I do that?
3. While performing vMotions my storage intermittently goes offline. Where would you start troubleshooting that?
4. I want to add another isolation address to my cluster. Walk me through that.
5. Concerning virtual networking, what are static port mappings vs. dynamic?
6. Describe in detail how AutoDeploy works.

Container Questions
Tech level 1

1. What is a container? How does it differ from a virtual machine?
2. What are some advantages of containerizing an application? Disadvantages?

Tech level 2

1. What steps would I take to create a custom Docker image then push it to a private registry?
2. How can I get my container to start automatically with my system?
3. How can I get a list of running containers?

Tech level 3

1. What is a system container?
2. How do I remove a kubernetes node from a cluster?