1
00:00:00,500 --> 00:00:01,890
‫Okay, so let's practice

2
00:00:01,890 --> 00:00:03,010
‫using Auto Scaling groups.

3
00:00:03,010 --> 00:00:04,410
‫To do so, first of all,

4
00:00:04,410 --> 00:00:06,600
‫please make sure to take your instances

5
00:00:06,600 --> 00:00:07,660
‫and terminate them all

6
00:00:07,660 --> 00:00:11,760
‫to have zero instances running in EC2.

7
00:00:11,760 --> 00:00:13,200
‫Okay, so next we have to create

8
00:00:13,200 --> 00:00:14,300
‫an Auto Scaling group.

9
00:00:14,300 --> 00:00:16,020
‫So let's go into Auto Scaling groups

10
00:00:16,020 --> 00:00:17,380
‫on the left hand side,

11
00:00:17,380 --> 00:00:18,350
‫and we're going to create

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00:00:18,350 --> 00:00:19,500
‫our first Auto Scaling group.

13
00:00:19,500 --> 00:00:21,060
‫So create Auto Scaling group,

14
00:00:21,060 --> 00:00:24,320
‫let's name our Auto Scaling group DemoASG,

15
00:00:24,320 --> 00:00:26,360
‫and we need to refer to a launch template,

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00:00:26,360 --> 00:00:29,223
‫so I'm going to create a launch template right now.

17
00:00:30,680 --> 00:00:32,378
‫So when you create a launch template

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00:00:32,378 --> 00:00:33,563
‫you need to give it a name,

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00:00:33,563 --> 00:00:35,063
‫I will give it MyDemoTemplate,

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00:00:36,880 --> 00:00:38,713
‫as well as a description,

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00:00:39,780 --> 00:00:40,820
‫Template.

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00:00:40,820 --> 00:00:44,050
‫Okay, so we're going to scroll down

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00:00:44,050 --> 00:00:45,940
‫and specify different options.

24
00:00:45,940 --> 00:00:49,221
‫So for the Amazon Machine Image I'm going to use,

25
00:00:49,221 --> 00:00:50,700
‫I'm going to go into Quick Start,

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00:00:50,700 --> 00:00:51,533
‫Amazon Linux,

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00:00:51,533 --> 00:00:53,020
‫I would choose Amazon Linux 2,

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00:00:53,020 --> 00:00:54,263
‫in the version x86.

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00:00:55,443 --> 00:00:58,690
‫Okay, and we'll use a free tier eligible AMI,

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00:00:58,690 --> 00:00:59,900
‫so that's good.

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00:00:59,900 --> 00:01:01,000
‫Next for Instance type,

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00:01:01,000 --> 00:01:03,010
‫I'm going to select t2.micro

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00:01:03,010 --> 00:01:04,410
‫because it is free tier eligible,

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00:01:04,410 --> 00:01:06,830
‫so anything free tier eligible is good.

35
00:01:06,830 --> 00:01:08,770
‫And I will scroll down in terms of Key pair,

36
00:01:08,770 --> 00:01:11,010
‫I will include EC2 Tutorial,

37
00:01:11,010 --> 00:01:12,880
‫so this is defining pretty much

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00:01:12,880 --> 00:01:15,897
‫how EC2 instances within my launch template

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00:01:15,897 --> 00:01:18,350
‫and therefore within my ASG,

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00:01:18,350 --> 00:01:19,183
‫should be launched.

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00:01:19,183 --> 00:01:20,780
‫Okay, so the options are very similar

42
00:01:20,780 --> 00:01:22,000
‫to the ones you've seen

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00:01:22,000 --> 00:01:24,493
‫when you launch an EC2 instance on its own.

44
00:01:25,620 --> 00:01:27,580
‫For subnets you don't include it

45
00:01:27,580 --> 00:01:28,940
‫in the launch templates.

46
00:01:28,940 --> 00:01:30,050
‫For Firewall security group

47
00:01:30,050 --> 00:01:31,220
‫you can select an existing one,

48
00:01:31,220 --> 00:01:34,240
‫for example, your launch-wizard-1.

49
00:01:34,240 --> 00:01:36,750
‫You have 8 gigabytes of gp2 volume,

50
00:01:36,750 --> 00:01:37,900
‫this is good.

51
00:01:37,900 --> 00:01:40,210
‫And then for Advanced details,

52
00:01:40,210 --> 00:01:42,540
‫I'm going to scroll all the way down,

53
00:01:42,540 --> 00:01:44,800
‫and I will find my User data,

54
00:01:44,800 --> 00:01:47,130
‫and for User data I'm going to input

55
00:01:47,130 --> 00:01:49,160
‫the user data we used from before,

56
00:01:49,160 --> 00:01:49,993
‫so all of it,

57
00:01:49,993 --> 00:01:52,780
‫and this is going to allow a web server

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00:01:52,780 --> 00:01:54,770
‫to be created on every EC2 instance

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00:01:54,770 --> 00:01:56,503
‫as part of this ASG.

60
00:01:57,640 --> 00:01:58,473
‫So we're good to go,

61
00:01:58,473 --> 00:01:59,880
‫let's create this launch template,

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00:01:59,880 --> 00:02:00,713
‫it has been created,

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00:02:00,713 --> 00:02:02,439
‫called the MyDemoTemplate.

64
00:02:02,439 --> 00:02:03,710
‫I'm going to refresh it

65
00:02:03,710 --> 00:02:04,960
‫and select it right here.

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00:02:04,960 --> 00:02:07,970
‫So we have MyDemoTemplate Version 1.

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00:02:07,970 --> 00:02:09,510
‫We have the summary of it,

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00:02:09,510 --> 00:02:12,520
‫and we click on next to keep on going.

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00:02:12,520 --> 00:02:14,580
‫So we choose the instance launch options,

70
00:02:14,580 --> 00:02:15,810
‫we have a VPC,

71
00:02:15,810 --> 00:02:17,020
‫which is default VPC,

72
00:02:17,020 --> 00:02:18,440
‫as well as the ability

73
00:02:18,440 --> 00:02:19,960
‫to launch into three different subnets,

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00:02:19,960 --> 00:02:23,063
‫so eu-west-1a, 1b, and 1c.

75
00:02:24,320 --> 00:02:25,153
‫Instance requirements.

76
00:02:25,153 --> 00:02:27,980
‫So we have those provided by the templates

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00:02:27,980 --> 00:02:29,610
‫which is a t2.micro,

78
00:02:29,610 --> 00:02:31,370
‫but we could, if we wanted to,

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00:02:31,370 --> 00:02:33,250
‫override them, okay?

80
00:02:33,250 --> 00:02:34,480
‫And when you override them

81
00:02:34,480 --> 00:02:36,240
‫you can specify instant attributes

82
00:02:36,240 --> 00:02:38,200
‫or manually add instance types.

83
00:02:38,200 --> 00:02:40,080
‫And you can have a mix of on demand

84
00:02:40,080 --> 00:02:41,812
‫and spot instances,

85
00:02:41,812 --> 00:02:44,680
‫as well as a mix of different instance types.

86
00:02:44,680 --> 00:02:46,390
‫So this is definitely more advanced,

87
00:02:46,390 --> 00:02:48,450
‫but for now we'll just keep it

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00:02:48,450 --> 00:02:50,490
‫as the instance type requirements

89
00:02:50,490 --> 00:02:52,130
‫from the Launch template,

90
00:02:52,130 --> 00:02:55,113
‫so we'll have it as t2.micro only.

91
00:02:56,020 --> 00:02:57,360
‫Let's click on Next.

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00:02:57,360 --> 00:02:59,120
‫Then we can configure advanced options,

93
00:02:59,120 --> 00:03:00,630
‫so Load balancing is optional,

94
00:03:00,630 --> 00:03:02,380
‫so we can create an ASG

95
00:03:02,380 --> 00:03:03,890
‫without a load balancer,

96
00:03:03,890 --> 00:03:06,030
‫and there are a few use cases for that, okay?

97
00:03:06,030 --> 00:03:08,720
‫But we already have an load balancer,

98
00:03:08,720 --> 00:03:11,150
‫so we're going to Attach to an existing load balancer

99
00:03:11,150 --> 00:03:13,320
‫and it will choose my-first-target-group

100
00:03:13,320 --> 00:03:16,010
‫from my DemoALB application balancer.

101
00:03:16,010 --> 00:03:18,400
‫So that the EC2 instances launched

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00:03:18,400 --> 00:03:21,030
‫as part of this ASG are linked

103
00:03:21,030 --> 00:03:24,950
‫to my application load balancer directly.

104
00:03:24,950 --> 00:03:26,100
‫For Health checks this is optional,

105
00:03:26,100 --> 00:03:28,390
‫but again we have two kinds of health checks,

106
00:03:28,390 --> 00:03:29,730
‫the first is the EC2 health check.

107
00:03:29,730 --> 00:03:31,860
‫So if my EC2 instance fails

108
00:03:31,860 --> 00:03:33,550
‫is going to be removed automatically

109
00:03:33,550 --> 00:03:35,330
‫from my Auto Scaling group,

110
00:03:35,330 --> 00:03:37,220
‫and we can also have an ELB type

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00:03:37,220 --> 00:03:38,370
‫of health check enabled,

112
00:03:38,370 --> 00:03:39,790
‫and we'll leave it enabled.

113
00:03:39,790 --> 00:03:42,130
‫So that if the ELB deems

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00:03:42,130 --> 00:03:44,310
‫that an instance is unhealthy,

115
00:03:44,310 --> 00:03:47,233
‫then the ASG will terminate it automatically.

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00:03:48,950 --> 00:03:52,170
‫Okay, we will not enable any additional settings.

117
00:03:52,170 --> 00:03:53,150
‫Click on Next.

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00:03:53,150 --> 00:03:55,150
‫So this is where you set your ASG Group size.

119
00:03:55,150 --> 00:03:57,233
‫So Desired capacity is 1

120
00:03:57,233 --> 00:03:58,066
‫Minimum capacity is 1,

121
00:03:58,066 --> 00:03:59,260
‫and Maximum capacity is 1,

122
00:03:59,260 --> 00:04:00,510
‫so that means that we have one instance

123
00:04:00,510 --> 00:04:01,660
‫within the ASG,

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00:04:01,660 --> 00:04:04,390
‫but if we could specify 10 as max capacity,

125
00:04:04,390 --> 00:04:06,930
‫which would allow us to have a varying size

126
00:04:06,930 --> 00:04:10,800
‫of the capacity of the ASG between 1 and 10.

127
00:04:10,800 --> 00:04:13,140
‫But I'll keep everything as 1 right now.

128
00:04:13,140 --> 00:04:15,560
‫Scaling policies for now I will keep it as None,

129
00:04:15,560 --> 00:04:16,520
‫but we'll have a look at them

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00:04:16,520 --> 00:04:18,440
‫in details later on.

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00:04:18,440 --> 00:04:20,280
‫Let's click on Next.

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00:04:20,280 --> 00:04:21,820
‫No notifications,

133
00:04:21,820 --> 00:04:22,960
‫no tags,

134
00:04:22,960 --> 00:04:24,250
‫we review everything,

135
00:04:24,250 --> 00:04:27,383
‫and then we click on Create Auto Scaling Group.

136
00:04:29,420 --> 00:04:32,970
‫Okay, so my Auto Scaling Group is created,

137
00:04:32,970 --> 00:04:34,100
‫and what is going to do is

138
00:04:34,100 --> 00:04:35,500
‫that it's going to create

139
00:04:35,500 --> 00:04:38,410
‫one EC2 instance for me.

140
00:04:38,410 --> 00:04:40,430
‫So the idea here is that if I click

141
00:04:40,430 --> 00:04:41,740
‫on my Auto Scouting Group,

142
00:04:41,740 --> 00:04:43,100
‫and we get some details,

143
00:04:43,100 --> 00:04:45,930
‫we can see the desired min and max capacity,

144
00:04:45,930 --> 00:04:47,330
‫as well as the Launch template

145
00:04:47,330 --> 00:04:49,573
‫that was used for this ASG.

146
00:04:50,500 --> 00:04:52,500
‫And then if I go into Activity

147
00:04:52,500 --> 00:04:55,130
‫this is where the interesting stuff happens.

148
00:04:55,130 --> 00:04:57,510
‫So when the ASG will decide

149
00:04:57,510 --> 00:04:59,750
‫to create an EC2 instance,

150
00:04:59,750 --> 00:05:03,160
‫it's going to appear in the Activity notifications,

151
00:05:03,160 --> 00:05:05,710
‫so if I refresh this, very soon,

152
00:05:05,710 --> 00:05:07,720
‫sorry, in the Activity history.

153
00:05:07,720 --> 00:05:09,980
‫So if I refresh the Activity history,

154
00:05:09,980 --> 00:05:11,860
‫then I can see that there is

155
00:05:11,860 --> 00:05:14,180
‫a Launching a new instance right here,

156
00:05:14,180 --> 00:05:16,260
‫because the Auto Scaling group

157
00:05:16,260 --> 00:05:17,380
‫has a capacity of 0,

158
00:05:17,380 --> 00:05:19,100
‫and we wanted 1 capacity,

159
00:05:19,100 --> 00:05:21,120
‫so it's just increasing the number

160
00:05:21,120 --> 00:05:23,080
‫of EC2 instances in our ASG,

161
00:05:23,080 --> 00:05:25,400
‫to match the desired capacity.

162
00:05:25,400 --> 00:05:27,570
‫So if I go to the tab Instance Management,

163
00:05:27,570 --> 00:05:28,660
‫as we can see,

164
00:05:28,660 --> 00:05:31,930
‫one EC2 instance was created by the ASG.

165
00:05:31,930 --> 00:05:34,620
‫And so if we go to the Instances tab right here,

166
00:05:34,620 --> 00:05:36,660
‫we can see that the EC2 instance

167
00:05:36,660 --> 00:05:39,500
‫is currently Running and initializing.

168
00:05:39,500 --> 00:05:40,780
‫So it's pretty cool.

169
00:05:40,780 --> 00:05:41,613
‫Now the cool thing is that

170
00:05:41,613 --> 00:05:44,220
‫because we had set up our ASG

171
00:05:44,220 --> 00:05:46,290
‫to be linked to our Target Groups,

172
00:05:46,290 --> 00:05:48,610
‫then if we go to the Target Groups

173
00:05:48,610 --> 00:05:49,713
‫on the left hand side,

174
00:05:51,810 --> 00:05:53,800
‫and find my-first-target-group,

175
00:05:53,800 --> 00:05:55,240
‫and go to Targets,

176
00:05:55,240 --> 00:05:57,190
‫my EC2 instance is being,

177
00:05:57,190 --> 00:05:58,520
‫and I will just expand it,

178
00:05:58,520 --> 00:06:00,630
‫my EC2 instance is being registered

179
00:06:00,630 --> 00:06:02,500
‫into my ALB.

180
00:06:02,500 --> 00:06:03,710
‫So right now it is shows that

181
00:06:03,710 --> 00:06:06,170
‫as unhealthy because the object are failing,

182
00:06:06,170 --> 00:06:09,620
‫because the EC2 instance is still bootstrapping.

183
00:06:09,620 --> 00:06:12,830
‫But if after a bit it passes,

184
00:06:12,830 --> 00:06:14,490
‫it will be shown as healthy,

185
00:06:14,490 --> 00:06:17,180
‫and then will be registered into my ALB.

186
00:06:17,180 --> 00:06:19,330
‫So let me pause the video to wait for that.

187
00:06:20,330 --> 00:06:23,230
‫Okay, so my instance is now healthy,

188
00:06:23,230 --> 00:06:26,530
‫and then if I go to my ALB and refresh,

189
00:06:26,530 --> 00:06:28,340
‫I get the Hello World response,

190
00:06:28,340 --> 00:06:30,120
‫that means that everything is functioning,

191
00:06:30,120 --> 00:06:32,910
‫the instance was created by an ESG.

192
00:06:32,910 --> 00:06:35,010
‫We can see it in the EC2 console,

193
00:06:35,010 --> 00:06:36,930
‫it was registered into the target group

194
00:06:36,930 --> 00:06:38,370
‫which is linked to our load balancer,

195
00:06:38,370 --> 00:06:41,550
‫and therefore our load balancer is fully working.

196
00:06:41,550 --> 00:06:43,660
‫Now, if the instance never gets healthy

197
00:06:43,660 --> 00:06:45,060
‫it gets unhealthy,

198
00:06:45,060 --> 00:06:46,930
‫then because we set up our ASG

199
00:06:46,930 --> 00:06:48,510
‫to terminate unhealthy instances,

200
00:06:48,510 --> 00:06:49,343
‫what you're going to see is

201
00:06:49,343 --> 00:06:51,730
‫that the instance is going to be terminated,

202
00:06:51,730 --> 00:06:53,490
‫and a new one will be created.

203
00:06:53,490 --> 00:06:55,060
‫So you will see this mostly

204
00:06:55,060 --> 00:06:56,560
‫in the Activity history.

205
00:06:56,560 --> 00:06:58,000
‫If you do have this,

206
00:06:58,000 --> 00:06:59,680
‫the reason why this is happening

207
00:06:59,680 --> 00:07:02,740
‫is that your EC2 instance is misconfigured.

208
00:07:02,740 --> 00:07:05,570
‫This could be either a security group issue

209
00:07:05,570 --> 00:07:08,040
‫or it could be an EC2 user data script issue.

210
00:07:08,040 --> 00:07:09,320
‫So please check those

211
00:07:09,320 --> 00:07:11,500
‫before asking questions in the Q&A.

212
00:07:11,500 --> 00:07:13,020
‫Okay, but these are the errors

213
00:07:13,020 --> 00:07:14,290
‫that you should be having.

214
00:07:14,290 --> 00:07:17,410
‫So now we have one EC2 instance

215
00:07:17,410 --> 00:07:18,830
‫and it's in service.

216
00:07:18,830 --> 00:07:19,880
‫And what we could do

217
00:07:19,880 --> 00:07:21,810
‫is that we can experience the scaling

218
00:07:21,810 --> 00:07:24,110
‫by editing the Auto Scaling group size.

219
00:07:24,110 --> 00:07:26,210
‫So we want two instances,

220
00:07:26,210 --> 00:07:27,060
‫and so we have to increase

221
00:07:27,060 --> 00:07:28,840
‫the maximum capacity as well.

222
00:07:28,840 --> 00:07:30,620
‫So we'll update this.

223
00:07:30,620 --> 00:07:32,890
‫And now what we told the ASG

224
00:07:32,890 --> 00:07:34,960
‫is that we want you to create one

225
00:07:34,960 --> 00:07:37,140
‫or more EC2 instance for us.

226
00:07:37,140 --> 00:07:39,870
‫So if you go to the Activity history

227
00:07:39,870 --> 00:07:41,593
‫and then refresh it,

228
00:07:42,770 --> 00:07:45,830
‫very soon is going to show a new activity

229
00:07:45,830 --> 00:07:47,790
‫that it will be trying to be launching

230
00:07:47,790 --> 00:07:48,730
‫an EC2 instance.

231
00:07:48,730 --> 00:07:49,690
‫So here we go,

232
00:07:49,690 --> 00:07:51,920
‫now it says Launching a new EC2 instance,

233
00:07:51,920 --> 00:07:54,310
‫because you have changed the desire capacity

234
00:07:54,310 --> 00:07:55,550
‫from 1 to 2,

235
00:07:55,550 --> 00:07:57,660
‫and the actual number of instances

236
00:07:57,660 --> 00:07:59,820
‫in our a ASG was only one.

237
00:07:59,820 --> 00:08:00,920
‫So now, as you can see,

238
00:08:00,920 --> 00:08:03,710
‫we have a second EC2 instance being created,

239
00:08:03,710 --> 00:08:06,290
‫and after a while is going to be registered

240
00:08:06,290 --> 00:08:09,170
‫into our target group and added.

241
00:08:09,170 --> 00:08:10,050
‫So I will pause the video

242
00:08:10,050 --> 00:08:11,453
‫for this process to happen.

243
00:08:12,320 --> 00:08:14,740
‫Okay, so my instance is now healthy.

244
00:08:14,740 --> 00:08:16,586
‫And so if I go to my ALB and refresh,

245
00:08:16,586 --> 00:08:20,030
‫as we can see I got my two IPs

246
00:08:20,030 --> 00:08:21,370
‫that are looping through my ALB.

247
00:08:21,370 --> 00:08:23,400
‫So everything is working great.

248
00:08:23,400 --> 00:08:24,580
‫And so one last thing,

249
00:08:24,580 --> 00:08:25,470
‫so if we go to activities,

250
00:08:25,470 --> 00:08:27,550
‫we can see the two instances

251
00:08:27,550 --> 00:08:28,800
‫were launched successfully.

252
00:08:28,800 --> 00:08:30,190
‫Now let's go through the opposite,

253
00:08:30,190 --> 00:08:32,970
‫we're going to scale down our capacity

254
00:08:32,970 --> 00:08:35,830
‫by putting the Desired capacity back to 1,

255
00:08:35,830 --> 00:08:36,800
‫and update it,

256
00:08:36,800 --> 00:08:37,720
‫and what this will do

257
00:08:37,720 --> 00:08:38,707
‫is that it will say,

258
00:08:38,707 --> 00:08:41,350
‫"hey, it looks like you have two instances,

259
00:08:41,350 --> 00:08:43,380
‫but now you need only one,

260
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‫so I'm going to pick one

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‫of these two instances right here

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‫and terminate them."

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‫So as you can see here,

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‫it says, "I'm terminating one of these instances

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‫because of the change of the configuration

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‫of the ASG,"

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‫and is going to terminate the instance

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‫and then deregister it from the target group.

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‫And then we'll be back

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‫with only one EC2 instance in our ASG.

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‫So that's it for the lecture,

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‫you've seen the whole power of ASG,

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‫and I will see you in the next lecture

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‫to talk about Automatic scaling.