Yaml Understanding Help
Hi,
I've done some googling and I'm still looking for a good example of a fully flushed out YAML file that has comments.
I'm having a tough time understanding where each key value pair go as well was the formatting.
I understand that most use two spaces but I don't really understand why some files have different key values.
For example,
I'm looking at the batch job.yaml file in the lab. I don't have a good grasp why there is another spec in the file as well has how the indentation is working and why containers is at the bottom. I understand it is based on what kind the application is but I still don't seem to understand what is needed for what kind of application I'd deploy in kubernetes.
I feel that this is something very basic that I need a good link or something to I can understand how to read and create the YAML files better.
I see
spec:
completions: 5
template:
spec:
containers:
Thanks.
Comments
-
Ignore the formatting. I don't see a code block button.
0 -
@btanoue You can use the code formatting option (see the screenshot attached)!
0 -
Thank You! I was looking for a button and never checked the Paragraph button. Most sites have a dedicated code button.
0 -
apiVersion: batch/v1
kind: Job
metadata:
name: sleepy
spec:
completions: 5
parallelism: 2
activeDeadlineSeconds: 15
template:
spec:
containers:
- name: resting
image: busybox
command: ["/bin/sleep"]
args: ["5"]
restartPolicy: Never
0 -
Hello,
When trying to figure out the indentation of YAML and what it will become I like to paste into the right side of https://json2yaml.com/ As kube-apiserver persists data to etcd in JSON, you can see why various sections have their indentation.
The reason you will find more than one
spec:
entry in a file has to do with the nature of the watch-loop, or controller, which will use the code. Some controllers monitor and create other controllers. As a result they pass along the other spec to the watched controller. For example if you look at the YAML of a Deployment you will notice there is spec information for the deployment, spec information for the replicaSet it creates and spec information for the pods the replicaset will create. In the Jobs area a CronJob creates a job which creates a Pod. So you would also have more than one spec area in the YAML.Hopefully that helps.
Regards,
0 -
Hi,
Thanks, I'll take a look at it. I'm just worried I'll spend way too much time on the exam for not indenting correctly. I don't think there is a syntax fixer we can use during the test.
0 -
Hello,
Indeed. Remember you can use two websites during the exam, reference the Exam Guide to learn more. You may want to bookmark pages in the browser you will use during the exam, to have an example of the more complex YAML files.
Good luck on the exam.
0 -
Thank You, I'll start to look at that.
0
Categories
- All Categories
- 207 LFX Mentorship
- 207 LFX Mentorship: Linux Kernel
- 734 Linux Foundation IT Professional Programs
- 339 Cloud Engineer IT Professional Program
- 166 Advanced Cloud Engineer IT Professional Program
- 66 DevOps Engineer IT Professional Program
- 132 Cloud Native Developer IT Professional Program
- 120 Express Training Courses
- 120 Express Courses - Discussion Forum
- 5.9K Training Courses
- 40 LFC110 Class Forum - Discontinued
- 66 LFC131 Class Forum
- 39 LFD102 Class Forum
- 220 LFD103 Class Forum
- 17 LFD110 Class Forum
- 32 LFD121 Class Forum
- 17 LFD133 Class Forum
- 6 LFD134 Class Forum
- 17 LFD137 Class Forum
- 70 LFD201 Class Forum
- 3 LFD210 Class Forum
- 2 LFD210-CN Class Forum
- 2 LFD213 Class Forum - Discontinued
- 128 LFD232 Class Forum - Discontinued
- 1 LFD233 Class Forum
- 3 LFD237 Class Forum
- 23 LFD254 Class Forum
- 685 LFD259 Class Forum
- 109 LFD272 Class Forum
- 3 LFD272-JP クラス フォーラム
- 10 LFD273 Class Forum
- 99 LFS101 Class Forum
- LFS111 Class Forum
- 2 LFS112 Class Forum
- 1 LFS116 Class Forum
- 3 LFS118 Class Forum
- 2 LFS142 Class Forum
- 3 LFS144 Class Forum
- 3 LFS145 Class Forum
- 1 LFS146 Class Forum
- 2 LFS147 Class Forum
- 8 LFS151 Class Forum
- 1 LFS157 Class Forum
- 10 LFS158 Class Forum
- 4 LFS162 Class Forum
- 1 LFS166 Class Forum
- 3 LFS167 Class Forum
- 1 LFS170 Class Forum
- 1 LFS171 Class Forum
- 2 LFS178 Class Forum
- 2 LFS180 Class Forum
- 1 LFS182 Class Forum
- 4 LFS183 Class Forum
- 30 LFS200 Class Forum
- 737 LFS201 Class Forum - Discontinued
- 2 LFS201-JP クラス フォーラム
- 17 LFS203 Class Forum
- 114 LFS207 Class Forum
- 1 LFS207-DE-Klassenforum
- LFS207-JP クラス フォーラム
- 301 LFS211 Class Forum
- 55 LFS216 Class Forum
- 49 LFS241 Class Forum
- 43 LFS242 Class Forum
- 37 LFS243 Class Forum
- 13 LFS244 Class Forum
- 1 LFS245 Class Forum
- 45 LFS250 Class Forum
- 1 LFS250-JP クラス フォーラム
- LFS251 Class Forum
- 143 LFS253 Class Forum
- LFS254 Class Forum
- LFS255 Class Forum
- 6 LFS256 Class Forum
- LFS257 Class Forum
- 1.2K LFS258 Class Forum
- 9 LFS258-JP クラス フォーラム
- 114 LFS260 Class Forum
- 152 LFS261 Class Forum
- 41 LFS262 Class Forum
- 82 LFS263 Class Forum - Discontinued
- 15 LFS264 Class Forum - Discontinued
- 11 LFS266 Class Forum - Discontinued
- 23 LFS267 Class Forum
- 18 LFS268 Class Forum
- 29 LFS269 Class Forum
- 199 LFS272 Class Forum
- 1 LFS272-JP クラス フォーラム
- LFS274 Class Forum
- 3 LFS281 Class Forum
- 2 LFW111 Class Forum
- 257 LFW211 Class Forum
- 176 LFW212 Class Forum
- 12 SKF100 Class Forum
- SKF200 Class Forum
- 791 Hardware
- 199 Drivers
- 68 I/O Devices
- 37 Monitors
- 98 Multimedia
- 174 Networking
- 91 Printers & Scanners
- 85 Storage
- 754 Linux Distributions
- 82 Debian
- 67 Fedora
- 16 Linux Mint
- 13 Mageia
- 23 openSUSE
- 147 Red Hat Enterprise
- 31 Slackware
- 13 SUSE Enterprise
- 351 Ubuntu
- 464 Linux System Administration
- 39 Cloud Computing
- 70 Command Line/Scripting
- Github systems admin projects
- 91 Linux Security
- 78 Network Management
- 101 System Management
- 47 Web Management
- 56 Mobile Computing
- 17 Android
- 28 Development
- 1.2K New to Linux
- 1K Getting Started with Linux
- 366 Off Topic
- 114 Introductions
- 171 Small Talk
- 20 Study Material
- 527 Programming and Development
- 293 Kernel Development
- 216 Software Development
- 1.1K Software
- 212 Applications
- 181 Command Line
- 3 Compiling/Installing
- 405 Games
- 311 Installation
- 79 All In Program
- 79 All In Forum
Upcoming Training
-
August 20, 2018
Kubernetes Administration (LFS458)
-
August 20, 2018
Linux System Administration (LFS301)
-
August 27, 2018
Open Source Virtualization (LFS462)
-
August 27, 2018
Linux Kernel Debugging and Security (LFD440)