The -b flag in an Ansible ad-hoc command indicates that the command should be executed with sudo privileges.
Anonymous Quiz
48%
false
52%
true
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DevOps(Document Repository)
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Data is cached everywhere, from the front end to the back end!
This diagram illustrates where we cache data in a typical architecture.
There are multiple layers along the flow :
1. Client apps: HTTP responses can be cached by the browser.
We request data over HTTP for the first time, and it is returned with an expiry policy in the HTTP header; we request data again, and the client app tries to retrieve the data from the browser cache first.
2. CDN: CDN caches static web resources. The clients can retrieve data from a CDN node nearby.
3. Load Balancer: The load Balancer can cache resources as well.
4. Messaging infra: Message brokers store messages on disk first, and then consumers retrieve them at their own pace.
Depending on the retention policy, the data is cached in Kafka clusters for a period of time.
5. Services: There are multiple layers of cache in a service. If the data is not cached in the CPU cache, the service will try to retrieve the data from memory. Sometimes the service has a second-level cache to store data on disk.
6. Distributed Cache: Distributed cache like Redis hold key-value pairs for multiple services in memory. It provides much better read/write performance than the database.
7. Full-text Search: we sometimes need to use full-text searches like Elastic Search for document search or log search. A copy of data is indexed in the search engine as well.
8. Database: Even in the database, we have different levels of caches:
WAL(Write-ahead Log): data is written to WAL first before building the B tree index
9. Bufferpool: A memory area allocated to cache query results
Materialized View: Pre-compute query results and store them in the database tables for better query performance
10. Transaction log: record all the transactions and database updates
Replication Log: used to record the replication state in a database cluster.
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DevOps_Shack_100_Common_Kubernetes_Errors_and_Solutions_1737719531.pdf
1.5 MB
#Kubernetes
100 Kubernetes Errors &
Solutions
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100 Kubernetes Errors &
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AWS_CLI_Cheat_Sheet__1737737484.pdf
409 KB
#AWS
AWS CLI cheat sheet
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How do you view and manage systemd services in Ubuntu?
Anonymous Quiz
88%
Use 'systemctl'
5%
Run 'servicemgr'
5%
Type 'sysman'
3%
Use 'srvctl'
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Docker_Scenario_Based_Questions_with_Solutions_1737719474.pdf
1 MB
#Docker
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Which argument do you need to specify in order to run a specific Ansible module?
Anonymous Quiz
19%
--modules
47%
-m
4%
-ml
31%
--ansible-module
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If the Plesk server can't run Docker locally, you can still connect to a remote Docker server to manage containers. You'll need:
Anonymous Quiz
6%
A virtuozzo 6 container
20%
One separate ready-to-code environment
10%
A Windows Server
64%
The Plesk Docker extension
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What is the purpose of the `docker service scale` command in Docker Swarm?
Anonymous Quiz
24%
It changes the number of nodes in the cluster
58%
It adjusts the number of replicas for a service
9%
It resizes the storage volumes
8%
It restarts all services in the cluster
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Cloud_1729292087.pdf
7.4 MB
#Cloud
#Network
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What is an OpenShift Project?
Anonymous Quiz
39%
A virtual environment to store application code
23%
A namespace for organizing resources
8%
A module for monitoring performance
31%
An external service for deployment
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Jenkins__1738257750.pdf
1.1 MB
#Jenkins
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Which command allows you to change the file ownership in Ubuntu?
Anonymous Quiz
90%
Use 'sudo chown user:group filename'
6%
Run 'changeowner filename'
2%
Type 'setowner user filename'
2%
Use 'chperm -own filename'
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DevOps(Document Repository)
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kuberenetes__1738354879.pdf
2.8 MB
#Book
#Kubernetes
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_Terraform_with_100_concise_questions_1738319673.pdf
634.9 KB
#Terraform
Exploring the essentials of Terraform with 100 concise questions for quick
learning!
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Exploring the essentials of Terraform with 100 concise questions for quick
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How do you copy an entire directory along with its contents in Ubuntu?
Anonymous Quiz
92%
Use 'cp -r /source/directory /destination/directory'
3%
Run 'copy-dir'
2%
Type 'dir-copy'
2%
Use 'copy-folder -all'
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