Add prometheus questions
And answers to two Docker questions.
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README.md
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README.md
@ -10,7 +10,7 @@
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1. [Ansible](#ansible)
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1. [Docker](#docker)
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1. [Python](#python)
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1. [Prometheus](#prometheus)
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## Jenkins
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@ -227,15 +227,41 @@ I'm {{ ansible_hostname }} and my operating system is {{ ansible_distribution }
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* What happens when you run `docker run hello-world`?
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```
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Docker CLI passes your request to Docker daemon.
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Docker daemon downloads the image from Docker Hub
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Docker daemon creates a new container by using the image it downloaded
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Docker daemon redirects output from container to Docker CLI which redirects it to the standard output
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```
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* How do you run a container?
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* What do you see when you run `docker ps`?
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* What `docker commit` does? when will you use it?
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* Explain what is Dockerfile used for and the content of the following Dockerfile
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```
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FROM registry.access.redhat.com/rhel7/rhel
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RUN yum -y install httpd && yum -y update; yum clean all
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EXPOSE 80
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ENTRYPOINT [ "/usr/sbin/httpd" ]
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CMD [ "-D", "FOREGROUND" ]
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```
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Answer:
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```
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Use the image 'rhel7/rhel' from the registry 'registry.access.redhat.com` to run httpd.
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Befor running it, install the httpd package, update all packages and expose port 80.
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```
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## Python
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###### beginner
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##### beginner
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* What data type supported in Python and which of them are mutable?
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What function can you use to show that a certain data type is mutable?
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@ -271,7 +297,7 @@ PEP8 is a list of coding conventions and style guidelines for Python
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5. Use 4 spaces per indentation level
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```
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###### Intermediate
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##### Intermediate
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* What _ is used for in Python?
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@ -295,3 +321,18 @@ sorted(x, key=lambda l: l[1])
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```
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set([food for bro in x for food in bro['food']])
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```
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## Prometheus
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* Describe the following Prometheus components:
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- Prometheus server
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- Push Gateway
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- Alert Manager
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```
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Prometheus server responsible for scraping the storing the data
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Push gateway is used for short-lived jobs
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Alert manager is responsible for alerts ;)
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```
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* What is an exporter? What is it used for?
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