diff --git a/README.md b/README.md index 1186186..2dc4b77 100644 --- a/README.md +++ b/README.md @@ -3,9 +3,10 @@ ## Table of Contents - 1. [Jenkins Questions](#jenkins) - 1. [AWS Questions](#aws) - 1. [Network Questions](#network) + 1. [Jenkins](#jenkins) + 1. [AWS](#aws) + 1. [Network](#network) + 4. [Linux](#linux) @@ -64,6 +65,7 @@ - What objects in S3 consists of? - Another way to ask it: explain key, value, version id and metadata in context of objects - Explain data consistency +- Can you host dynamic websites on s3? what about static websites? ###### CloudFront @@ -75,7 +77,141 @@ - What delivery methods available for the user with CDN? - True or False? object are cached for the life of TTL + + ## Network Network questions can be found [here](https://github.com/bregman-arie/computer-networking/blob/master/interview_questions/README.md) + + +## Linux + +* What is the different between a soft link and hard link? + +``` +hard link is the same file, using the same inode. +soft link is a shortcut to another file, using a different inode. + +soft links can be created between different file systems while +hard link can be created only within the same file system. +``` + +* How to run a process in background and why to do that in the first place? +``` +You can achieve that by specifying & at end of the command. +As to Why? since some commands/processes can take a lot of time to finish +execution or run forever +``` + +* What signal is used when you run 'kill '? +``` +The default signal is SIGTERM (15). This signal kills +process gracefully which means it allows it to save current +state configuration. +followup questions: +what is SIGKILL? +what other signals there are? +``` + + + +## Ansible + +* Describe each of the following components in Ansible, including the relationship between them: + * Task + * Module + * Play + * Playbook + * Role + +``` +Task – a call to a specific Ansible module +Module – the actual unit of code executed by Ansible on your own host or a remote host. Modules are indexed by category (database, file, network, …) and also referred as task plugins. + +Play – One or more tasks executed on a given host(s) + +Playbook – One or more plays. Each play can be executed on the same or different hosts + +Role – Ansible roles allows you to group resources based on certain functionality/service such that they can be easily reused. In a role, you have directories for variables, defaults, files, templates, handlers, tasks, and metadata. You can then use the role by simply specifying it in your playbook. +``` + +* Write a task to create the directory ‘/tmp/new_directory’ + +``` +- name: Create a new directory + file: + path: "/tmp/new_directory" + state: directory +``` + +* What would be the result of the following play? + +``` +--- +- name: Print information about my host + hosts: localhost + gather_facts: 'no' + tasks: + - name: Print hostname + debug: + msg: "It's me, {{ ansible_hostname }}" +``` + +``` +When given a written code, always inspect it thoroughly. If your answer is “this will fail” then you are right. We are using a fact (ansible_hostname), which is a gathered piece of information from the host we are running on. But in this case, we disabled facts gathering (gather_facts: no) so the variable would be undefined which will result in failure. +``` + +* Write a playbook to install ‘zlib’ and ‘vim’ on all hosts if the file ‘/tmp/mario’ exists on the system. + +``` +--- +- hosts: all + vars: + mario_file: /tmp/mario + package_list: + - 'zlib' + - 'vim' + tasks: + - name: Check for mario file + stat: + path: "{{ mario_file }}" + register: mario_f + + - name: Install zlib and vim if mario file exists + become: "yes" + package: + name: "{{ item }}" + state: present + with_items: "{{ package_list }}" + when: mario_f.stat.exists +``` + +* Write a playbook to deploy the file ‘/tmp/system_info’ on all hosts except for controllers group, with the following content + + ``` + I'm and my operating system is + ``` + + replace and with the actual data for the specific host you are running on + +The playbook to deploy the system_info file + +``` +--- +- name: Deploy /tmp/system_info file + hosts: all:!controllers + tasks: + - name: Deploy /tmp/system_info + template: + src: system_info.j2 + dest: /tmp/system_info +``` + +The content of the system_info.j2 template + +``` +# {{ ansible_managed }} +I'm {{ ansible_hostname }} and my operating system is {{ ansible_distribution } +``` +