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Session-07.txt
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Web/frontend
app/api/backend
db
AWS Regions, AZ
AMI --> Amazon machine image
AWS resources are mostly region based, few services are global
AZ is for disaster recovery purpose.
HA --> we can create resources atleast in 2AZ.
DR --> move resources immidiately to another AZ. move resources to another region, but it takes few hours
AMI --> Amazon Machine image
We frequently need nginx servers to install applications.
OS + Install package + configure service/package
We can create image out of server.
stable vs moving
when server is running, by the time you take photo of server, many things may happen. it leads to errors.
Windows OS + install MS office + Anti virus = Windows-10.iso
devops-practice --> AMI for entire course
-------------------
It is username and password --> centos DevOps321
centos8 = AWS Linux 2 = RHEL8 = Fedora
Developers, architects
-----------------------
What programming languages
What are the tools and versions of programming
DevOps architects
-----------------
DevOps tools and versions
google.com --> allow
facebook.com --> don't allow
youtube.com
a show is only visible in US region.
your phone is a server which has some files
your client is laptop which is requesting to view files
developer write the code --> compile --> build/package
java -> .jar
all languages --> .zip
RDBMS --> SQL --> Relation Database management system --> Rows and Columns
NoSQL --> No SQL -> no tables no rows and columns --> data is based on documents and collections --> js files
RDBMS vs NoSQL
MongoDB --> NoSQL
netstat -lntp
27017 --> mongodb
127.0.0.1 --> localhost
By default some servers mostly DB servers, you can't open them apart from local server. this is for security
catalogue
------------------
this is microservice developed in nodejs
write the code --> compile --> packaged --> .zip file
we need to install node environment
system/service user
-------------------
user --> human
system(non-human) --> on behalf of users, applications have dedicated users for security
install dependencies/libraries -->
maven --> pom.xml
nodejs/js --> package.json
requirements.txt --> python
Tasks
----------
Forward vs Reverse proxy
MySQL and NoSQL
what is system user in linux