connect.md

Pre:Requisite: Selinux to Permissive:

setenforce 0
nano /etc/selinux/config
systemctl stop consul

Step 1: Configure Nginx

yum -y install nginx

cd /etc/nginx/conf.d/
nano services.conf

server {
    server_name _;
    listen 8080;
    location / {
         proxy_pass http://127.0.0.1:5000;
}
  }

server {
    server_name _;
    listen 9080;
    root /usr/share/nginx/html/backend-service;
}

cd /usr/share/nginx/html
mkdir backend-service
cd backend-service
echo "Backend Service" > index.html
nginx -t
systemctl start nginx

Step 2: Create Service Definition:

Definition for Backend Service:

cd /tmp

nano backend-service.hcl

service {
  name = "backend-service"
  id = "backend-service"
  port = 9080

  connect {
    sidecar_service {}
  }

  check {
    id       = "backend-service-check"
    http     = "http://localhost:9080"
    method   = "GET"
    interval = "1s"
    timeout  = "1s"
  }
}

consul services register backend-service.hcl

nano frontend-service.hcl

service {
  name = "frontend-service"
  port = 8080

  connect {
    sidecar_service {
      proxy {
        upstreams = [
          {
            destination_name = "backend-service"
            local_bind_port  = 5000
          }
        ]
      }
    }
  }

  check {
    id       = "backend-service-check"
    http     = "http://localhost:8080"
    method   = "GET"
    interval = "1s"
    timeout  = "1s"
  }
}

consul agent -dev --client=0.0.0.0

consul services register frontend-service.hcl
consul services register backend-service.hcl

Step 3: Start Sidecar Proxy:

consul connect proxy -sidecar-for frontend-service > /tmp/frontend-service.log &
consul connect proxy -sidecar-for backend-service > /tmp/backend-service.log &
netstat -ntlp

Step 4: Verification:

curl localhost:8080
less /tmp/backend-service.log