Month: June 2020

Openfaas – serverless deployment with k8

1.Create serverless python3 deployment

faas-cli new --lang python3 python-fn --gateway http://192.168.0.183:31112 --prefix=192.168.0.183:30500/python-fn

–prefix = Docker private repository
–gateway = Openfass gateway server

2.It will create the python-fn directory and python-fn.yml file

3.Write your python code inside python-fn/handler.py

def handle(req):
    """handle a request to the function
    Args:
        req (str): request body
    """
    print("hola-openfaas")
    return req

4.Build / Push / Deploy

faas-cli build -f python-fn.yml
faas-cli push -f python-fn.yml
export OPENFAAS_URL=http://192.168.0.183:31112
faas-cli login --password "YOUR_Openfaas_PASSWORD"
faas-cli deploy -f python-fn.yml

5. Remove

faas-cli remove -f python-fn.yml
rm -rf python-fn*

Openfaas installation in k8

curl -sL https://cli.openfaas.com | sudo sh

git clone https://github.com/openfaas/faas-netes

kubectl apply -f https://raw.githubusercontent.com/openfaas/faas-netes/master/namespaces.yml

PASSWORD=$(head -c 12 /dev/urandom | shasum| cut -d' ' -f1)

kubectl -n openfaas create secret generic basic-auth \
--from-literal=basic-auth-user=admin \
--from-literal=basic-auth-password="$PASSWORD"

cd faas-netes

kubectl apply -f ./yaml

nohup kubectl port-forward svc/gateway -n openfaas 31112:8080 &


export OPENFAAS_URL=http://192.168.0.183:31112

echo -n "$PASSWORD" | faas-cli login --password-stdin

echo "$PASSWORD"

https://docs.openfaas.com/deployment/kubernetes/

kubernetes Highly Available clusters Using 3 Master node

1. Setup TCP load balancer using nginx (192.168.0.50)

load_module /usr/lib64/nginx/modules/ngx_stream_module.so;
events { }

stream {

upstream kapi {
	server 192.168.0.51:6443;
	server 192.168.0.52:6443;
	server 192.168.0.53:6443;
}

server {
	listen 8888;
	proxy_pass kapi;
    }

}

2. Run below command on all master node

yum install -y kubelet kubeadm kubectl docker
systemctl enable kubelet
systemctl start kubelet
systemctl enable docker
systemctl start docker

3. Run below command on 192.168.0.51

kubeadm init --control-plane-endpoint "192.168.0.50:8888" --upload-certs

It will generate command to add other master node and worker node

4.Join other 2 master (192.168.0.51, 192.168.0.52)

 kubeadm join 192.168.0.50:8888 --token hvlnv8.6r90i8d04cs23sii \
    --discovery-token-ca-cert-hash sha256:bc6fe39f98c7ae6cd8434bd8ade4eb3b15b45e151af37595e4be0a9fdfcfdcc4 \
    --control-plane --certificate-key 3659353b0a256650fb0c1a0357cb608d07e3bdc8ce8b64fa995bcb814c131fa6

Note : Token will be differ

5.Get the info of cluster

kubectl cluster-info

kubectl get node

Skip stages in Jenkins

stages {

def skip_stage = 'skip'
pipeline
{
agent {
    label 'master'
}
parameters {
string(name: 'skip_stage', description: 'skip stage', defaultValue: 'skip')
}
  stages
{
  stage("test") {
     when {
        expression { skip_stage != "skip" }
     }
     steps {
        echo 'This will never run'
     }
  }
}
}

More when condition : https://gist.github.com/merikan/228cdb1893fca91f0663bab7b095757c