AWS

Consider the following below topics and sub-topics to learn and understand to get into Devops. Kubernetes Architecture Api Server - REST, watched by multiple items(kubelet, k-proxy), certificate for request etcd - key-value store, cluster in eks for HA Scheduler - taints, tolerations, affinity based scheduling Kube Controller Manager - state of pods and changes, both watch api server kubelet(run on each node) and interaction with containerd(it creates the container asked by scheduler) k-proxy - runs on each node, handles networking and DNS. Flat networking Deployment, pod, service, secret, configmaps (understand their working and connection) Ingress Controller and ingress resource (ingress, egress etc and what they are) commands to run inside container pod lifecycles pod, node networking(DNS, fqdn) Service Account, roles, clusterrole, rolebinding and clusterrolebinding NetworkPolicies and how they work Volumes (types, mount location) important Authorization, authentication and Admission controller Flow of request (refer to image in Documents/devops folder) CRDs Go deeper into more topics and its API conventions AWS Knowledge of cloud practitioner course Working and knowledge of EC2 Setup Patching Security Groups subnets userdata Networking Knowledge Public and private subnets(internet access to private subnets) NAT and gateways VPC endpoints ALB vs NLB vpc peering vs transit gateway Security groups and their port mapping CIDR block Route53 record types working and health checks(setting them up) monitoring route53 Cloudwatch logs creating dashboard understanding metrics and querying Web Server(Apache and Nginx) need of web server virtual hosting allow/deny IPs .htaccess and htpasswd reverse proxy Implement thread and other directives configure logging understand various log formats server logs, audit logs enable, check tracking of users Docker (containerization) need of docker docker networking (types of docker networks) docker commands and creating dockerfile Docker compose docker swarm volume mounts and their types port mapping (left host: right container) Meaning of commands like - ENTRYPOINT ARG (how its used) WORKDIR etc Jenkins and Gitlab Pipeline setup understand groovy syntax understand .gitlab-ci.yml file as well create own groovy scripts terraform what is IAAC and why IAAC is needed? create own tf code and store locally ADHOC iops and throughput mail configure, smtp, send mail redirects openSSL postfix(similar to sendMail) sftp in linux, add user ipsec, ACL, port forwarding port forwarding in nginx jumpbox private to public network understand kernel, patching Consul and Istio setup and service mesh store env in consul and update them try istio for more like request tracing ArgoCD: TODO Setup Argo later for CD as CI needs its own jenkins/gitlab pipeline First learn pipelines and then use ArgoCD later Programming Python Automate anything and everything with this. Create and focus on logic with this Golang learn this for long time future complex solution sbuild from python to this Things to be good at Linux Administration Monitoring CI & CD Pipelines Some sort of scripting General cloud knowledge of a specific provider Communication Integrations Development workflows Performance tuning (web server, network, database)

MongoDB is also known as DocumentDB or NoSQL database. The reason it is called documentDB is it stores and retrieves data in the form of semi-structured or unstructured documents DocumentDB DocumentDB is AWS offering for NoSQL database which stores data in semi-structured data as documents than traditional relational data with fixed schema. It provides high scalability, high availability and security and works well for applications that require LOW latency and HIGH throughput for read/write operations. ...

Topic in SNS In Amazon Simple Notification Service (SNS), a topic is an access point for allowing subscribers to receive notifications or messages. When you publish a message to a topic, SNS sends the message to all the subscribers of that topic. Sending files as attachments Yes, you can use Amazon Simple Notification Service (SNS) to send a CSV file stored in an Amazon S3 bucket as an attachment in an email notification. Here are the high-level steps to achieve this: ...

Devops is mainly three things - Infrastructure Automation Monitoring Infrastructure You need a server for hosting, server is an infrastructure. You need database for backend, database is infrastructure. It refers to the underlying system and hardware responsible for development and delivery. Automation It means automating stuff being done manually to waste less time doing the same stuff. Monitoring It means keeping track of application working, finding problems and bugs and fixing them right away. ...

MaxRequestWorkers MaxRequestWorkers is a configuration directive in the Apache web server that specifies the maximum number of simultaneous connections that the server can handle. It determines the maximum number of child processes or threads that can be spawned by the server to handle incoming requests. The MaxRequestWorkers directive is typically set in the Apache configuration file (httpd.conf) and determines the maximum number of worker processes that Apache can create to serve client requests. Each worker process can handle one client request at a time. When the maximum number of workers is reached, additional requests will be queued, waiting for a worker process to become available. ...