119-code-zero.sh

#############################################################
# Teleporting And Interceptiong Microservices With CodeZero #
# https://youtu.be/bt5lQqRJxlE                              #
#############################################################

# Referenced videos:
# - How to run local multi-node Kubernetes clusters using kind: https://youtu.be/C0v5gJSWuSo

######################################
# Installing and setting up CodeZero #
######################################

git clone https://github.com/vfarcic/code-zero-demo2

cd code-zero-demo2

# Please watch https://youtu.be/C0v5gJSWuSo if you are not familiar with KinD
# Feel free to use any other Kubernetes platform
kind create cluster --config kind.yaml

npm install -g @c6o/cli

# NPM?
# Compile it to binaries and allow me to either download them or install them throuw `brew`, `chocolatey`, etc.
# I do not want to install npm for one CLI, Python 2 for another, Python 3, Go, Java, etc.
# Learn go if you're creating CLIs.

# It takes ages to install the CLI.
# added 922 packages from 680 contributors in 2+min

sudo czctl init

# The CLI requires sudo access to modify your system's hosts file.
# The hosts file is used to define in-cluster DNS information on your local machine during a teleport session.

##################################
# The problem with microservices #
##################################

kubectl apply \
    --kustomize kustomize/overlays/staging

kubectl --namespace staging get all

##################################
# Teleporting into microservices #
##################################

czctl deployment teleport silly-demo \
    --namespace staging

curl http://silly-demo:8080

curl http://silly-demo.staging:8080

cat /etc/hosts

kubectl apply --kustomize kustomize/base

czctl deployment teleport silly-demo \
    --namespace default

##############################
# Intercepting microservices #
##############################

# In a second terminal and in the same directory
VERSION=1.0.1 PORT=8081 go run main.go

kubectl --namespace staging \
    run curl \
    --image alpine -it --rm -- sh -c \
    "apk add -U curl && curl http://silly-demo:8080"

czctl service intercept \
    --namespace staging silly-demo \
    --localPort 8081 \
    --remotePort 8080 \
    --header silly:demo

kubectl --namespace staging \
    run curl \
    --image alpine -it --rm -- sh -c \
    "apk add -U curl && curl http://silly-demo:8080"

kubectl --namespace staging \
    run curl \
    --image alpine -it --rm -- sh -c \
    "apk add -U curl && curl http://silly-demo:8080 -H silly:demo"

kubectl --namespace staging get pods

# In the second terminal
# Press `ctrl+c`

#############################
# Closing CodeZero sessions #
#############################

czctl session close --all

cat /etc/hosts

###########
# Destroy #
###########

kind delete cluster