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DevOps(Document Repository)
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kubernetes-cheat-sheet.pdf
130 KB
#Kubernetes

Kubernetes cheat sheet

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⚙️ #SystemDesign 📈📊📊

An HTTP server cannot automatically initiate a connection to a browser. As a result, the web browser is the initiator. What should we do next to get real-time updates from the HTTP server?

Both the web browser and the HTTP server could be responsible for this task.

🔴Web browsers do the heavy lifting: short polling or long polling. With short polling, the browser will retry until it gets the latest data. With long polling, the HTTP server doesn't return results until new data has arrived.
🔴HTTP server and web browser cooperate: WebSocket or SSE (server-sent event). In both cases, the HTTP server could directly send the latest data to the browser after the connection is established. The difference is that SSE is uni-directional, so the browser cannot send a new request to the server, while WebSocket is fully-duplex, so the browser can keep sending new requests.

➡️Over to you: of the four solutions (long polling, short polling, SSE, WebSocket), which ones are commonly used, and for what use cases?


©️ From : ByteByteGo


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How to save a new docker image with container id mentioned in the command on the local system.
Anonymous Quiz
46%
$ docker save 109ca6efc quizapi/httpd_image
24%
$ docker --save 109ca6efc quizapi/httpd_image
30%
$ docker commit 109ca6efc quizapi/httpd_image
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Which resource in OpenShift defines the location of a Docker image to be deployed without rebuilding the image?
Anonymous Quiz
37%
ImageStream
25%
BuildConfig
16%
ImagePolicy
21%
ContainerTemplate
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How to delete a pod in Kubernetes using the type and name specified in pod.json?
Anonymous Quiz
23%
kubectl delete ./pod.json
60%
kubectl delete -f ./pod.json
14%
kubectl remove -f ./pod.json
3%
kubectl remove ./pod.json
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Which command is used to check for bad sectors on a disk in Ubuntu?
Anonymous Quiz
75%
Use 'sudo badblocks -v /dev/sdX'
12%
Run 'disk-check-bad'
6%
Type 'check-bad-sectors'
8%
Use 'scan-disk for errors'
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nmap-cheat-sheet.pdf
91.5 KB
#Tools

Nmap cheat sheet

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http-cheat-sheet.pdf
70.3 KB
HTTP cheat sheet

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Which command is used to recover deleted files from an ext4 file system in Ubuntu?
Anonymous Quiz
73%
Use 'extundelete /dev/sdX --restore-all'
10%
Run 'recover-files ext4'
5%
Type 'undelete sdX'
13%
Use 'restore-data ext4'
trivy-cheat-sheet.pdf
79.9 KB
#Trivy

Trivy cheat sheet

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git-cheat-sheet.pdf
148.5 KB
#Git

Git cheat sheet

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What command would you use to delete a specific pod in OpenShift?
Anonymous Quiz
38%
oc remove pod <pod-name>
56%
oc delete pod <pod-name>
2%
oc clear pod <pod-name>
4%
oc stop pod <pod-name>
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DevOps(Document Repository)
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