What is the purpose of the `FROM` instruction in a Dockerfile?
Anonymous Quiz
85%
It sets the base image for the container
8%
It defines environment variables
3%
It installs packages
4%
It sets the working directory
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DevOps(Document Repository)
Photo
Network Programming with Go.pdf
3.9 MB
#Book
#Go
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#Go
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Forward proxy Vs Reverse proxy
A forward proxy is a server that sits between user devices and the internet. A forward proxy is commonly used for:
- Protect clients
- Avoid browsing restrictions
- Block access to certain content
A reverse proxy is a server that accepts a request from the client, forwards the request to web servers, and returns the results to the client as if the proxy server had processed the request. A reverse proxy is good for:
- Protect servers
- Load balancing
- Cache static contents
- Encrypt and decrypt SSL communications
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How to change the priority of a swap file/partition to 10
Anonymous Quiz
56%
swapon -p 10 /path/to/swapfile
23%
We can't change the priority of swap partions
14%
swapping -P 10 /path/to/swapfile
8%
swapon +10 /path/to/swapfile
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Ansible_1739460293.pdf
5.5 MB
#Ansible
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Which are the notable application areas for Docker?
Anonymous Quiz
83%
Simplifying configuration, Code pipelines management, Debugging capabilities and Rapid deployment.
17%
Robust, Transparency, code illustrator and slow deployment
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A Quick Reference to Database Scaling
1. Indexing: Analyze query patterns and create optimal indexes
2. Materialized Views: Pre-compute and store complex query results
3. Denormalization: Simplify joins to boost query performance
4. Vertical Scaling: Upgrade server resources (CPU, RAM, storage)
5. Caching: Store frequent data in faster memory
6. Replication: Create database copies on replicas to scale reads
7. Sharding: Distribute data across servers for improved scalability
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How do you copy a file from one location to another in Ubuntu?
Anonymous Quiz
93%
Use 'cp source destination'
3%
Run 'copyfile source destination'
1%
Type 'duplicate source destination'
2%
Use 'filecopy source destination'
AWS_networking_fundamentals_1739735250.pdf
1.7 MB
#AWS
#Network
AWS networking fundamentals
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#Network
AWS networking fundamentals
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azure_1739851452.pdf
4.9 MB
#Azure
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Jenkins_Starter_Guide_Ebook_1739466978.pdf
2.8 MB
#Jenkins
Jenkins starter giude
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Jenkins starter giude
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Which command would you use to force a restart of all pods in a DeploymentConfig?
Anonymous Quiz
57%
oc restart dc <DeploymentConfig-name>
12%
oc redeploy <DeploymentConfig-name>
25%
oc rollout latest <DeploymentConfig-name>
7%
oc refresh dc <DeploymentConfig-name>
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DevOps_Shack_Branching_Strategies_1739460015.pdf
1.6 MB
#Git
Git branching strategies
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Git branching strategies
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Which command is used to schedule a task to run at a specific time in Ubuntu?
Anonymous Quiz
83%
Use 'crontab -e'
12%
Run 'task-scheduler'
3%
Type 'schedule-task'
3%
Use 'add-task'
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Which command is used to create a systemd service in Ubuntu?
Anonymous Quiz
82%
Create a unit file in '/etc/systemd/system/' and use 'sudo systemctl enable service_name'
4%
Run 'service-create custom'
4%
Type 'add-service systemd'
10%
Use 'systemd service new'
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Kubernetes_Best_Practices__1740079801.pdf
2.4 MB
#Kubernetes
Kubernetes best practices
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Kubernetes best practices
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Which of the answers listed below refers to a command used for invoking a text editor in Unix-like operating systems?
Anonymous Quiz
7%
edit
4%
notepad
86%
vi
3%
bcdedit
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A_Comprehensive_Guide_to_Essential_Linux_Commands_1740079779.pdf
1.2 MB
#Linux
Linux Commands: Explanation and Practical Examples
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Linux Commands: Explanation and Practical Examples
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Which command allows you to enable packet capture on a specific network interface in Ubuntu?
Anonymous Quiz
80%
Use 'sudo tcpdump -i interface_name'
11%
Run 'netcapture interface'
5%
Type 'pkttrace -int'
3%
Use 'capture -network'
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SSH Under the Hood
Secure Shell (SSH) creates an encrypted channel between client and server.
The process begins with a TCP connection, followed by version negotiation.
Both parties then agree on encryption algorithms, key exchange methods, and message authentication codes.
The client and server perform a key exchange (typically using Diffie-Hellman) to securely generate a shared session key for encrypting the connection.
For authentication, SSH commonly uses public key authentication.
The server verifies the client's identity through a challenge-response mechanism using the client's public key, without the private key ever being transmitted.
Once authenticated, the session key encrypts all further communication, providing a secure channel.
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