session-57.txt

1. Build the image
2. Run the image

Namespace -> isolated project space where we create our project resources
Pod -> smallest deployable unit in kubernetes, pod contains multiple containers. every container share 	   same network and storage
Labels -> adds metadata to the pods, labels are selectors. we can attach labels to any resource in k8s
env -> can pass env variables to the containers
resources -> we need to restrict pod resources. request and limits soft limit and hard limit
annotations -> agains adds metadata, but used to select external resources like load balancers, IAM roles, etc
config map -> configuration resource, we can attach config map to the pod
secrets -> confidential information, can attach to pod environment, but only encoded information not encrypted
services
1. pod to pod communication since podip is ephemeral. we can communicate with service name
2. load balancing between pods
3. service select pods based on labels as selectors

1. cluster ip -> internally exposing pod with in the cluster
2. node port -> cluster ip is subset of nodeport.. every node inside eks cluster open the nodeport. 30000–32767
3. load balancer -> node port is subset of load balancer. it will create a classic load balancer

Sets
=====
1. ReplicaSet -> create multiple replicas of your pod. always runs desired number of pods
2. Deployment
3. DaemonSet
4. StatefulSet


deployment/release
==========
you have v1 running, v2 is ready

1. stop the application server or component. systemctl stop catalogue
2. remove the v1 code
3. download v2 code
4. restart catalogue. systemctl restart catalogue

since pods are immutable, we can create another set of v2 pods, then delete v1 pods

etcd -> k8 cluster storage...

85  03/04/26 02:55:51 kubectl describe pod nginx-78cc6c5555-b55qs
   86  03/04/26 02:56:01 kubectl rollout history deployment/nginx
   87  03/04/26 02:56:14 kubectl undo deployment nginx
   88  03/04/26 02:56:23 kubectl rollout undo deployment nginx
   89  03/04/26 02:56:34 kubectl rollout history deployment/nginx
   90  03/04/26 03:05:32 cd ..
   91  03/04/26 03:05:40 git clone https://github.com/daws-88s/k8-roboshop.git
   92  03/04/26 03:05:46 cd k8-roboshop/
   93  03/04/26 03:05:47 clear
   94  03/04/26 03:05:54 kubectl apply -f 01-namespace.yaml
   95  03/04/26 03:05:59 cd mongodb/
   96  03/04/26 03:06:04 kubectl apply -f manifest.yaml
   97  03/04/26 03:06:15 kubectl get deployment -n roobshop
   98  03/04/26 03:06:24 kubectl get deployment -n roboshop
   99  03/04/26 03:06:35 kubectl get rs -n roboshop
  100  03/04/26 03:06:46 kubectl get pods -o wide -n roboshop
  101  03/04/26 03:06:56 kubectl get svc -n roboshop
  102  03/04/26 03:07:10 kubectl describe svc mongodb -n rooboshop
  103  03/04/26 03:07:14 kubectl describe svc mongodb -n roboshop
  104  03/04/26 03:12:15 git pull
  105  03/04/26 03:12:21 cd ../catalogue/
  106  03/04/26 03:12:32 kubectl apply -f manifest.yaml
  107  03/04/26 03:12:37 kubectl get pods
  108  03/04/26 03:12:43 kubectl get pods -n roboshop
  109  03/04/26 03:13:08 kubectl exec -it catalogue-7758f68dc7-j46rc -- bash
  110  03/04/26 03:13:12 kubectl exec -it catalogue-7758f68dc7-j46rc -- sh
  111  03/04/26 03:13:18 kubectl get pods -n roboshop
  112  03/04/26 03:13:34 kubectl exec -it catalogue-7758f68dc7-j46rc -n roboshop -- sh
  113  03/04/26 03:18:15 cd ../../eksctl/
  114  03/04/26 03:19:32 kubectl get svc -o wide
  115  03/04/26 03:23:21 history