diff --git a/README.md b/README.md index 2b1e67c..1b9bc9d 100644 --- a/README.md +++ b/README.md @@ -3,7 +3,7 @@ :information_source:  This repository contains interview questions on various DevOps related topics -:bar_chart:  There are currently **216** questions +:bar_chart:  There are currently **230** questions :warning:  You don't need to know how to answer all the questions in this repo. DevOps is not about knowing all :) @@ -166,6 +166,14 @@ which follows the immutable infrastructure paradigm. Describe the workflow of setting up some type of web server (Apache, IIS, Tomact, ...)
+
+Explain monitoring. What is it? Why it's important?
+
+ +
+What monitoring methods are you familiar with?
+
+ #### :star: Advanced @@ -223,15 +231,30 @@ Note: cross-dependency is when you have two or more changes to separate projects #### :baby: Beginner
-Why are you using Jenkins? What are the advantages of Jenkins over its competitors?
+What is Jenkins? What have you used it for?
-What is a plugin?
+What are the advantages of Jenkins over its competitors? Can you compare it to one of the following systems?: + + * Travis + * Bamboo + * Teamcity + * CircleCI
-What plugins are you using in Jenkins? Which do you consider to be the most useful?
+Explain the following: + + * Job + * Build + * Plugin + * Slave + * Executor
+
+ +
+What plugins have you used in Jenkins?
@@ -239,11 +262,15 @@ Note: cross-dependency is when you have two or more changes to separate projects
-What type of jobs there are? what is the advantage of each type?
+What type of jobs are there? Which types have you used and why?
-What ways are you familiar with to notify users on build results?
+How did you report build results to users? What ways are you familiar with?
+
+ +
+You need to run unit tests every time a change submitted to a given project. Describe in details how your pipeline would look like and what will be executed in each stage
@@ -258,7 +285,7 @@ Note: cross-dependency is when you have two or more changes to separate projects
-There are four teams in your organization. How to prioritize the builds of each team? So the jobs of team x will always run before team y
+There are four teams in your organization. How to prioritize the builds of each team? So the jobs of team x will always run before team y for example
@@ -269,12 +296,19 @@ Note: cross-dependency is when you have two or more changes to separate projects If you are managing a dozen of jobs, you can probably use the Jenkins UI. How do you manage the creation and deletion of hundreds of jobs every week/month?
+
+What are some of Jenkins limitations?
+ + * Testing cross-dependencies (changes from multiple projects together) + * Starting builds from any stage (although cloudbees implemented something called checkpoints) +
+
How would you implement an option of a starting a build from a certain stage and not from the beginning?
-What are some of Jenkins limitations?
+Have you written Jenkins scripts? If yes, what for and how they work?
## AWS @@ -480,6 +514,7 @@ CSMA/CD algorithm: * rmdir (can you achieve the same result by using rm?) * grep * wc + * touch * df
@@ -498,6 +533,8 @@ With cron, tasks are scheduled using the following format: The tasks are stored in a cron file. +##### Permissions +
How to change the permissions of a file?
@@ -616,6 +653,10 @@ hard link can be created only within the same file system. What RAID is used for? Can you explain the differences between RAID 0, 1, 5 and 10?
+
+What is lazy umount?
+
+
Fix the following commands: @@ -728,21 +769,53 @@ related to the file like its size, owner, permissions, etc.
-DNS: What is a "A record"?
+What is NTP? What is it used for?
-DNS: What is a PTR?
+What is SELiunx?
+
+ +
+What is nftables?
+
+ +
+What firewalld daemon is responsible for?
+
+ +##### DNS + +
+What the file /etc/resolv.conf is used for? What does it include?
+
+ +
+What is a "A record"?
+
+ +
+What is a PTR record?
While an A record points a domain name to an IP address, a PTR record does the opposite and resolves the IP address to a domain name.
-DNS: What is a MX record?
+What is a MX record?
-DNS: is it using TCP or UDP?
+Is DNS using TCP or UDP?
+
+ +##### Packaging + +
+Do you have experience with packaging? Can you explain how it works?
+
+ +
+RPM: explain the spec format(what it should and can include)
@@ -1101,6 +1174,9 @@ Swarm management which means you can create new swarms in Docker Cloud. ## Kubernetes + +#### :baby: Beginner +
What is Kubernetes?
@@ -1216,6 +1292,10 @@ set([food for bro in x for food in bro['food']]) Shortest way is: my_string[::-1] but it doesn't mean it's the most efficient one. +
+Write a function to determine if a given string is a palindrome
+
+
Explain what is GIL
@@ -1232,7 +1312,7 @@ Shortest way is: my_string[::-1] but it doesn't mean it's the most
-Are you familiar with Dataclasses? Can you explain what are they used for?
+Are you familiar with Dataclasses? Can you explain what are they used for?
diff --git a/scenarios/jenkins/scripts/jobs_with_string.groovy b/scenarios/jenkins/scripts/jobs_with_string.groovy new file mode 100644 index 0000000..f0bf21f --- /dev/null +++ b/scenarios/jenkins/scripts/jobs_with_string.groovy @@ -0,0 +1,6 @@ +def jobs = Jenkins.instance.items.findAll { job -> job.name =~ /"REMOVE_ME"/ } + +jobs.each { job -> + println job.name + //job.delete() +} diff --git a/scenarios/jenkins/scripts/old_builds.groovy b/scenarios/jenkins/scripts/old_builds.groovy new file mode 100644 index 0000000..f45130a --- /dev/null +++ b/scenarios/jenkins/scripts/old_builds.groovy @@ -0,0 +1,16 @@ +def removeOldBuilds(buildDirectory, days = 14) { + + def wp = new File("${buildDirectory}") + def currentTime = new Date() + def backTime = currentTime - days + + wp.list().each { fileName -> + folder = new File("${buildDirectory}/${fileName}") + if (folder.isDirectory()) { + def timeStamp = new Date(folder.lastModified()) + if (timeStamp.before(backTime)) { + folder.delete() + } + } + } +} diff --git a/scenarios/jenkins_scripts.md b/scenarios/jenkins_scripts.md index afaf96d..d8a20ef 100644 --- a/scenarios/jenkins_scripts.md +++ b/scenarios/jenkins_scripts.md @@ -3,3 +3,9 @@ Write the following scripts: * Remove all the jobs which include the string "REMOVE_ME" in their name +* Remove builds older than 14 days + +### Answer + +* [Remove jobs which include specific string](jenkins/scripts/jobs_with_string.groovy) +* [Remove builds older than 14 days](jenkins/scripts/old_builds.groovy)