aws(学习笔记第二课) AWS SDK（node js）

aws(学习笔记第二课)

• 使用AWS SDK（node js）

学习内容：

• 使用AWS SDK（node js）

1. AWS SDK（node js）

1. AWS支持多种SDK开发(除了AWS CLI，还支持其他的SDK)
   • Android
   • Python
   • Node.js(Javascript)
   • Java
   • Browsers(Javascript)
   • Ruby
   • PHP
   • .NET
   • IOS
   • Go
2. 使用Node.js来控制AWS

   • 安装Node.js
     这是前提条件，这里采用windows + git bash的方式练习，首先安装Node.js

   • Node.js的程序结构

   • index.js
     这个是main程序入口，定义了以下的功能

     • listServer(list servers 展示所有的ec2 server列表)
     • listAMIs.js(create server 创建ec2 server)
     • listServers.js( terminate server 终止ec2 server)

   • \lib下的各个*.js

     • createServer.js 创建ec2 server
       注意，这里的KeyName一定要和前面设定的密钥对名字一致。
     • listAMIs.js 列出全部可用ami
     • listServers.js 列出全部可用ec2 server
     • listSubnets.js 列出全部可用subnet
     • showServer.js 列出所有创建的ec2 server
     • terminateServer.js 终止列出的ec2 server

   • index.js以及各个lib/*.js

     • index.js

       var blessed = require('blessed');var screen = blessed.screen({autoPadding: true,smartCSR: true,log: "./nodecc.log"
       });screen.title = 'Node Control Center for AWS';var content = blessed.box({  parent: screen,width: '70%',height: '90%',top: '10%',left: '30%',border: {type: 'none',fg: '#ffffff'},fg: 'white',bg: 'blue',content: '{bold}Node Control Center for AWS{/bold}\n\nPlease select one of the actions from the left and press return.\n\nYou can always go back with the left arrow key.\n\nYou can terminate the application by pressing ESC or q.',tags: true
       });var progress = blessed.progressbar({parent: screen,width: '70%',height: '10%',top: '0%',left: '30%',orientation: 'horizontal',border: {type: 'line',fg: '#ffffff'},fg: 'white',bg: 'blue',barFg: 'green',barBg: 'green',filled: 0
       });var list = blessed.list({  parent: screen,width: '30%',height: '100%',top: '0%',left: '0%',border: {type: 'line',fg: '#ffffff'},fg: 'white',bg: 'blue',selectedBg: 'green',mouse: true,keys: true,vi: true,label: 'actions',items: ['list servers', 'create server', 'terminate server']
       });
       list.on('select', function(ev, i) {content.border.type = 'line';content.focus();list.border.type = 'none';open(i);screen.render(); 
       });
       list.focus();function open(i) {screen.log('open(' + i + ')');if (i === 0) {loading();require('./lib/listServers.js')(function(err, instanceIds) {loaded();if (err) {log('error', 'listServers cb err: ' + err);} else {var instanceList = blessed.list({fg: 'white',bg: 'blue',selectedBg: 'green',mouse: true,keys: true,vi: true,items: instanceIds});content.append(instanceList);instanceList.focus();instanceList.on('select', function(ev, i) {loading();require('./lib/showServer.js')(instanceIds[i], function(err, instance) {loaded();if (err) {log('error', 'showServer cb err: ' + err);} else {var serverContent = blessed.box({  fg: 'white',bg: 'blue',content:'InstanceId: ' + instance.InstanceId + '\n' +'InstanceType: ' + instance.InstanceType + '\n' +'LaunchTime: ' + instance.LaunchTime + '\n' +'ImageId: ' + instance.ImageId + '\n' +'PublicDnsName: ' + instance.PublicDnsName});content.append(serverContent);}screen.render(); });});screen.render(); }screen.render(); });} else if (i === 1) {loading();require('./lib/listAMIs.js')(function(err, result) {loaded();if (err) {log('error', 'listAMIs cb err: ' + err);} else {var amiList = blessed.list({fg: 'white',bg: 'blue',selectedBg: 'green',mouse: true,keys: true,vi: true,items: result.descriptions});content.append(amiList);amiList.focus();amiList.on('select', function(ev, i) {var amiId = result.amiIds[i];loading();require('./lib/listSubnets.js')(function(err, subnetIds) {loaded();if (err) {log('error', 'listSubnets cb err: ' + err);} else {var subnetList = blessed.list({fg: 'white',bg: 'blue',selectedBg: 'green',mouse: true,keys: true,vi: true,items: subnetIds});content.append(subnetList);subnetList.focus();subnetList.on('select', function(ev, i) {loading();require('./lib/createServer.js')(amiId, subnetIds[i], function(err) {loaded();if (err) {log('error', 'createServer cb err: ' + err);} else {var serverContent = blessed.box({  fg: 'white',bg: 'blue',content: 'starting ...'});content.append(serverContent);}screen.render(); });});screen.render(); }screen.render(); });});screen.render(); }screen.render(); });} else if (i === 2) {loading();require('./lib/listServers.js')(function(err, instanceIds) {loaded();if (err) {log('error', 'listServers cb err: ' + err);} else {var instanceList = blessed.list({fg: 'white',bg: 'blue',selectedBg: 'green',mouse: true,keys: true,vi: true,items: instanceIds});content.append(instanceList);instanceList.focus();instanceList.on('select', function(ev, i) {loading();require('./lib/terminateServer.js')(instanceIds[i], function(err) {loaded();if (err) {log('error', 'terminateServer cb err: ' + err);} else {var serverContent = blessed.box({  fg: 'white',bg: 'blue',content: 'terminating ...'});content.append(serverContent);}screen.render(); });});screen.render(); }screen.render(); });} else {log('error', 'not supported');screen.render(); }
       }screen.key('left', function(ch, key) {  content.border.type = 'none';content.children.slice().forEach(function(child) {content.remove(child);});list.border.type = 'line';list.focus();screen.render(); 
       });screen.key(['escape', 'q', 'C-c'], function(ch, key) { return process.exit(0);
       });var loadingInterval;function loading() {progress.reset();clearInterval(loadingInterval);loadingInterval = setInterval(function() {if (progress.filled < 75) {progress.progress(progress.filled + 5);}screen.render(); }, 200);
       }function loaded() {clearInterval(loadingInterval);progress.progress(100);screen.render(); 
       }function log(level, message) {screen.log('[' + level + ']: ' + message);
       }screen.render(); 
       

   • /lib/createServer.js

     var AWS = require('aws-sdk');
     var ec2 = new AWS.EC2({"region": "ap-northeast-1"
     });module.exports = function(amiId, subnetId, cb) {ec2.runInstances({"ImageId": amiId,"MinCount": 1,"MaxCount": 1,"KeyName": "my-cli-key","InstanceType": "t2.micro","SubnetId": subnetId}, function(err) {if (err) {cb(err);} else {cb(null);}});
     };
     

   • /lib/listAMIs.js

     var jmespath = require('jmespath');
     var AWS = require('aws-sdk');
     var ec2 = new AWS.EC2({"region": "ap-northeast-1"
     });module.exports = function(cb) {ec2.describeImages({"Filters": [{"Name": "description","Values": ["Amazon Linux AMI *"]}]}, function(err, data) {if (err) {cb(err);} else {var amiIds = jmespath.search(data, 'Images[*].ImageId');var descriptions = jmespath.search(data, 'Images[*].Description');cb(null, {"amiIds": amiIds, "descriptions": descriptions});}});
     };
     

   • /lib/listServers.js

     var jmespath = require('jmespath');
     var AWS = require('aws-sdk');
     var ec2 = new AWS.EC2({"region": "ap-northeast-1"
     });module.exports = function(cb) {ec2.describeInstances({"Filters": [{"Name": "instance-state-name","Values": ["pending", "running"]}],"MaxResults": 10}, function(err, data) {if (err) {cb(err);} else {var instanceIds = jmespath.search(data, 'Reservations[].Instances[].InstanceId');cb(null, instanceIds);}});
     };
     

   • /lib/listSubnets.js 注意，这里默认的vpc

     var jmespath = require('jmespath');
     var AWS = require('aws-sdk');
     var ec2 = new AWS.EC2({"region": "ap-northeast-1"
     });module.exports = function(cb) {ec2.describeVpcs({"Filters": [{"Name": "isDefault","Values": ["true"]}]}, function(err, data) {if (err) {cb(err);} else {var vpcId = data.Vpcs[0].VpcId;ec2.describeSubnets({"Filters": [{"Name": "vpc-id","Values": [vpcId]}]}, function(err, data) {if (err) {cb(err);} else {var subnetIds = jmespath.search(data, 'Subnets[*].SubnetId');cb(null, subnetIds);}});}});
     };
     

   • /lib/showServer.js

     var AWS = require('aws-sdk');
     var ec2 = new AWS.EC2({"region": "ap-northeast-1"
     });module.exports = function(instanceId, cb) {ec2.describeInstances({"InstanceIds": [instanceId]}, function(err, data) {if (err) {cb(err);} else {cb(null, data.Reservations[0].Instances[0]);}});
     };
     

   • /lib/terminateServer.js

     var AWS = require('aws-sdk');
     var ec2 = new AWS.EC2({"region": "ap-northeast-1"
     });module.exports = function(instanceId, cb) {ec2.terminateInstances({"InstanceIds": [instanceId]}, function(err) {if (err) {cb(err);} else {cb(null);}});
     };
     

   • 启动Node.js的AWS SDK的应用程序nodecc press escape key to exit

     npm install
     node index.js
     

3. 使用应用程序nodecc控制AWS
   • 启动主程序，创建ec2 server
create server-> 选择Amazon Linux AMI 2018.03.0.20230322.0这个ami。注意，这里的InstanceType: t2micro,会导致一些ami会创建ec2 server失败。
   • 进入主菜单(left key to return main menu in the left)，进入list servers。
   • 选择subnet
     这里存在唯一default subnet，因此就显示一个subnet。
   • 创建了ec2 server之后，进入list server进行检查
     注意，可以在create server的同时，执行tail -f nodecc.log，因为可能有些原因，导致create server失败
     
   • 进入AWS Console进行检查
     
   • 登录创建的ec2 server
     
   • 及时终止创建的ec2 server
     练习完毕，利用terminate server进行ec2 server的终止，以免发生费用。