原文链接： Nomad

Nomad 名词解释

Nomad 类似 kubernets mesos 集群管理 部署工具
Sentinel 会不断地检查你的主服务器和从服务器是否运作正常

Install

解压安装包，将Nomad文件放在/usr/local/bin下.

    curl -O https://releases.hashicorp.com/nomad/0.8.4/nomad_0.8.4_linux_amd64.zip
    unzip -o nomad_0.7.0_linux_amd64.zip -d /usr/local/bin/
    cd /usr/local/bin
    chmod +x nomad

ansible-galaxy install brianshumate.nomad

安装地址：   /root/.ansible/roles/brianshumate.nomad

ANSIBLE_ROLES_PATH=.. ansible-playbook -i tests/inventory tests/test.yml --syntax-check

1. inventory
   vi hosts

   [nomad_instances]
   l19 nomad_node_role=both
   l18 nomad_node_role=both
   l17 nomad_node_role=server
   l16 nomad_node_role=client
   l15 nomad_node_role=client
   l14 nomad_node_role=client
   [all:vars]
   nomad_bind_address="0.0.0.0"
   

   1. site.yml

      ```yml

      File: site.yml - Example nomad site playbook

   2. name: Installing Nomad
      hosts: nomad_instances
      become: yes
      become_user: root
      roles:

   3. { role: brianshumate.nomad }

   tasks:

   • name: Start nomad
     service: name=nomad state=started enabled=yes
     
     ```
     

constraint

https://www.nomadproject.io/docs/job-specification/constraint.html

清理 nomad 数据

deleteNomad() {
  job="$1"
  echo "deleting $job..."
  stringarray=($job)
  jobID=${stringarray[0]}
  echo $jobID
  nomad stop -purge $jobID
}

nomad status > ./stat.txt

input="./stat.txt"
while IFS= read -r var
do
  deleteNomad "$var";
done < "$input"


rm -r ./stat.txt

java application

# task for Java Application
# 
# Download this file: 
# curl -sSL https://gist.githubusercontent.com/ryanpadilha/5854213edbad8a9698c72c8a6dc66e24/raw/ -o nomad-operation-for-java-app.hcl
#
# Operation for job execution:
#
# validate job      - $ nomad validate nomad-operation-for-java-app.hcl
# plan job          - $ nomad plan nomad-operation-for-java-app.hcl
# execution plan    - $ nomad run -check-index 55 nomad-operation-for-java-app.hcl
# execution status  - $ nomad status vulcano-health-check-monitor
# verify error exec - $ nomad alloc-status -verbose 5f33b395-d370-7ebb-851c-287811143041 
# 

job "vulcano-health-check-monitor" {
  datacenters = ["dc1"] # "us-west-1", "us-east-1"
  type = "service"
  
  group "java" {
    count = 1
    
    task "java-application" {
      driver = "java"
      user = "nomad"

      config {
        jar_path = "${NOMAD_META_AWS_PATH}/lib/vulcano-health-check-monitor-${NOMAD_META_APP_VERSION}.jar"
        jvm_options = ["-Xms64m", "-Xmx256m",
          "-Dspring.config.location=${NOMAD_META_AWS_CONFIG}/application-prd-health-monitor.properties"]
      }

      # TODO verify register this on Consul by service element
      # service { }
    
      # artifact used to ship the jar to run
      # download from http, https, git, hg, s3 - automatic unarchived
      artifact {
        source = "https://s3-sa-east-1.amazonaws.com/nomad-artifact/vulcano-health-check-monitor-0.0.1-dev.tar.gz"
        destination = "/var/wplex/apps"
        options {
          aws_access_key_id = "AKIAI2ZEQ7JXLSS3UW7Q"
          aws_access_key_secret = "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"
          # aws_access_token = "<token>"
        }
      }
    
      meta {
        AWS_PATH = "/var/wplex/apps/vulcano-health-check-monitor"
        AWS_CONFIG = "/var/wplex/apps/config"
        APP_VERSION = "0.0.1"
      }
    }
  }

  # constraints defined after task is placed on a node
  constraint {
    attribute = "${attr.kernel.name}"
    value = "linux"
  }
  
  constraint {
    attribute = "${attr.cpu.arch}"
    value     = "amd64"
  }

  #constraint {
  #  attribute = "${attr.platform.aws.instance-type}"
  #  value     = "m4.xlarge"
  #}
  
  constraint {
      attribute = "${attr.driver.java.version}"
      operator  = ">="
      value     = "1.8.0"
  }
}