一、启用CloudWatch Container Insight
注意：2021年之前本功能尚未在中国区发布，2021年10月在EKS 1.19上测试通过，2022年3月在EKS 1.21上测试通过，2022年4月在EKS 1.22上测试通过。
另外，之前版本的实验中，需要手工给Node节点增加IAM策略允许写入CloudWatch日志。再使用了新的eskctl启动配置文件后，现今Node节点已经自动包含了对应的权限，不需要这个步骤了。
1、部署配置文件（注意这一段需要Linux的bash来执行，Windows下cmd无法执行）
AWS海外区域执行如下命令，注意替换其中的Region和集群名称。
ClusterName=eksworkshop
RegionName=ap-southeast-1
FluentBitHttpPort='2020'
FluentBitReadFromHead='Off'
[[ ${FluentBitReadFromHead} = 'On' ]] && FluentBitReadFromTail='Off'|| FluentBitReadFromTail='On'
[[ -z ${FluentBitHttpPort} ]] && FluentBitHttpServer='Off' || FluentBitHttpServer='On'
curl https://myworkshop.bitipcman.com/eks101/cwagent-fluent-bit-quickstart.yaml | sed 's/{{cluster_name}}/'${ClusterName}'/;s/{{region_name}}/'${RegionName}'/;s/{{http_server_toggle}}/"'${FluentBitHttpServer}'"/;s/{{http_server_port}}/"'${FluentBitHttpPort}'"/;s/{{read_from_head}}/"'${FluentBitReadFromHead}'"/;s/{{read_from_tail}}/"'${FluentBitReadFromTail}'"/' | kubectl apply -f - AWS中国区域有时候存在下载速度问题，如果上一个地址不成功，可使用如下命令：
ClusterName=eksworkshop
RegionName=ap-southeast-1
FluentBitHttpPort='2020'
FluentBitReadFromHead='Off'
[[ ${FluentBitReadFromHead} = 'On' ]] && FluentBitReadFromTail='Off'|| FluentBitReadFromTail='On'
[[ -z ${FluentBitHttpPort} ]] && FluentBitHttpServer='Off' || FluentBitHttpServer='On'
curl https://myworkshop.bitipcman.com/eks101/cwagent-fluent-bit-quickstart-cn.yaml | sed 's/{{cluster_name}}/'${ClusterName}'/;s/{{region_name}}/'${RegionName}'/;s/{{http_server_toggle}}/"'${FluentBitHttpServer}'"/;s/{{http_server_port}}/"'${FluentBitHttpPort}'"/;s/{{read_from_head}}/"'${FluentBitReadFromHead}'"/;s/{{read_from_tail}}/"'${FluentBitReadFromTail}'"/' | kubectl apply -f - 部署完成。
2、查看Container Insight监控效果
进入Cloudwatch对应region界面，从左侧选择Container Insight，从右侧选择View performance dashboards，即可进入Container Insight。
二、调整节点组数量
前一步实验创建的集群时候没有指定节点数量，默认是2个节点，且系统会自动生成nodegroup，并分配nodegroup id。下面对这个nodegroup做扩容。
查询刚才集群的nodegroup id，执行如下命令，请替换集群名称为本次实验的名称。
eksctl get nodegroup --cluster eksworkshop输出结果如下。
2022-04-09 15:39:34 [ℹ] eksctl version 0.92.0
2022-04-09 15:39:34 [ℹ] using region ap-southeast-1
CLUSTER NODEGROUP STATUS CREATED MIN SIZE MAX SIZE DESIRED CAPACITY INSTANCE TYPE IMAGE ID ASG NAME TYPE
eksworkshop managed-ng ACTIVE 2022-04-09T04:34:33Z 3 6 3 t3.2xlarge AL2_x86_64 eks-managed-ng-64c0064d-112b-eeb2-f9be-87b0414216d7 managed这里可看到node group的名称是managed-ng，同时看到目前是最大6个节点，期望值是3个节点。
现在扩展集群到6个节点，并设置最大9节点。注意请替换下边语句中的cluster名称、region、nodegroup名称为当前实验对应的名称。
eksctl scale nodegroup --cluster=eksworkshop --region=ap-southeast-1 --name=managed-ng --nodes-min=3 --nodes-max=9 --nodes=6执行结果如下表示扩展成功。
2022-04-09 15:44:48 [ℹ] eksctl version 0.92.0
2022-04-09 15:44:48 [ℹ] using region ap-southeast-1
2022-04-09 15:44:50 [ℹ] scaling nodegroup "managed-ng" in cluster eksworkshop
2022-04-09 15:44:54 [ℹ] waiting for scaling of nodegroup "managed-ng" to complete
2022-04-09 15:45:10 [ℹ] waiting for scaling of nodegroup "managed-ng" to complete
2022-04-09 15:45:26 [ℹ] waiting for scaling of nodegroup "managed-ng" to complete
2022-04-09 15:45:45 [ℹ] waiting for scaling of nodegroup "managed-ng" to complete
2022-04-09 15:46:03 [ℹ] waiting for scaling of nodegroup "managed-ng" to complete
2022-04-09 15:46:04 [ℹ] nodegroup successfully scaled执行如下命令检查node数量。
kubectl get node返回结果如下表示扩容到6节点成功。
NAME STATUS ROLES AGE VERSION
ip-192-168-109-58.ap-southeast-1.compute.internal Ready <none> 29m v1.22.6-eks-7d68063
ip-192-168-122-179.ap-southeast-1.compute.internal Ready <none> 3h40m v1.22.6-eks-7d68063
ip-192-168-137-83.ap-southeast-1.compute.internal Ready <none> 3h40m v1.22.6-eks-7d68063
ip-192-168-151-125.ap-southeast-1.compute.internal Ready <none> 29m v1.22.6-eks-7d68063
ip-192-168-177-150.ap-southeast-1.compute.internal Ready <none> 29m v1.22.6-eks-7d68063
ip-192-168-181-37.ap-southeast-1.compute.internal Ready <none> 3h39m v1.22.6-eks-7d68063此时可以再次查询节点属性，执行如下命令。
eksctl get nodegroup --cluster eksworkshop返回结果如下表示扩容成功。
2022-04-09 16:17:15 [ℹ] eksctl version 0.92.0
2022-04-09 16:17:15 [ℹ] using region ap-southeast-1
CLUSTER NODEGROUP STATUS CREATED MIN SIZE MAX SIZE DESIRED CAPACITY INSTANCE TYPE IMAGE ID ASG NAME TYPE
eksworkshop managed-ng ACTIVE 2022-04-09T04:34:33Z 3 9 6 t3.2xlarge AL2_x86_64 eks-managed-ng-64c0064d-112b-eeb2-f9be-87b0414216d7 managed三、调整节点组EC2规格
前文创建集群使用node节点不能直接更换规格。为此，需要在当前集群下新建一个nodegroup，并使用新的EC2规格，随后再删除旧的nodegroup。此时pod也将会自动在新nodegroup上拉起。整个过程不影响应用访问。
1、新建使用新的EC2规格的nodegroup
编辑如下内容，并保存为newnodegroup.yaml文件。需要注意的是，如果新创建的Nodegroup在Public Subnet内，这直接使用如下内容即可。如果新创建的Nodegroup在Private Subnet内，那么请增加如下一行privateNetworking: true到配置文件中。添加的位置在volumeSize的下一行即可。
apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig
metadata:
name: eksworkshop
region: ap-southeast-1
version: "1.22"
managedNodeGroups:
- name: newng
labels:
Name: newng
instanceType: m5.2xlarge
minSize: 3
desiredCapacity: 3
maxSize: 6
volumeType: gp3
volumeSize: 100
tags:
nodegroup-name: newng
iam:
withAddonPolicies:
imageBuilder: true
autoScaler: true
certManager: true
efs: true
albIngress: true
xRay: true
cloudWatch: true编辑完毕后保存退出。执行如下命令创建：
eksctl create nodegroup -f newnodegroup.yaml执行结果如下。
2022-04-09 16:40:22 [ℹ] eksctl version 0.92.0
2022-04-09 16:40:22 [ℹ] using region ap-southeast-1
2022-04-09 16:40:33 [ℹ] nodegroup "newng" will use "" [AmazonLinux2/1.22]
2022-04-09 16:40:34 [ℹ] 1 existing nodegroup(s) (managed-ng) will be excluded
2022-04-09 16:40:34 [ℹ] 1 nodegroup (newng) was included (based on the include/exclude rules)
2022-04-09 16:40:34 [ℹ] will create a CloudFormation stack for each of 1 managed nodegroups in cluster "eksworkshop"
2022-04-09 16:40:35 [ℹ]
2 sequential tasks: { fix cluster compatibility, 1 task: { 1 task: { create managed nodegroup "newng" } }
}
2022-04-09 16:40:35 [ℹ] checking cluster stack for missing resources
2022-04-09 16:40:36 [ℹ] cluster stack has all required resources
2022-04-09 16:40:37 [ℹ] building managed nodegroup stack "eksctl-eksworkshop-nodegroup-newng"
2022-04-09 16:40:38 [ℹ] deploying stack "eksctl-eksworkshop-nodegroup-newng"
2022-04-09 16:40:38 [ℹ] waiting for CloudFormation stack "eksctl-eksworkshop-nodegroup-newng"
2022-04-09 16:40:55 [ℹ] waiting for CloudFormation stack "eksctl-eksworkshop-nodegroup-newng"
2022-04-09 16:41:12 [ℹ] waiting for CloudFormation stack "eksctl-eksworkshop-nodegroup-newng"
2022-04-09 16:41:33 [ℹ] waiting for CloudFormation stack "eksctl-eksworkshop-nodegroup-newng"
2022-04-09 16:41:52 [ℹ] waiting for CloudFormation stack "eksctl-eksworkshop-nodegroup-newng"
2022-04-09 16:42:09 [ℹ] waiting for CloudFormation stack "eksctl-eksworkshop-nodegroup-newng"
2022-04-09 16:42:31 [ℹ] waiting for CloudFormation stack "eksctl-eksworkshop-nodegroup-newng"
2022-04-09 16:42:49 [ℹ] waiting for CloudFormation stack "eksctl-eksworkshop-nodegroup-newng"
2022-04-09 16:43:10 [ℹ] waiting for CloudFormation stack "eksctl-eksworkshop-nodegroup-newng"
2022-04-09 16:43:26 [ℹ] waiting for CloudFormation stack "eksctl-eksworkshop-nodegroup-newng"
2022-04-09 16:43:45 [ℹ] waiting for CloudFormation stack "eksctl-eksworkshop-nodegroup-newng"
2022-04-09 16:43:47 [ℹ] no tasks
2022-04-09 16:43:47 [✔] created 0 nodegroup(s) in cluster "eksworkshop"
2022-04-09 16:43:48 [ℹ] nodegroup "newng" has 3 node(s)
2022-04-09 16:43:48 [ℹ] node "ip-192-168-124-223.ap-southeast-1.compute.internal" is ready
2022-04-09 16:43:48 [ℹ] node "ip-192-168-130-40.ap-southeast-1.compute.internal" is ready
2022-04-09 16:43:48 [ℹ] node "ip-192-168-172-17.ap-southeast-1.compute.internal" is ready
2022-04-09 16:43:48 [ℹ] waiting for at least 3 node(s) to become ready in "newng"
2022-04-09 16:43:48 [ℹ] nodegroup "newng" has 3 node(s)
2022-04-09 16:43:48 [ℹ] node "ip-192-168-124-223.ap-southeast-1.compute.internal" is ready
2022-04-09 16:43:48 [ℹ] node "ip-192-168-130-40.ap-southeast-1.compute.internal" is ready
2022-04-09 16:43:48 [ℹ] node "ip-192-168-172-17.ap-southeast-1.compute.internal" is ready
2022-04-09 16:43:48 [✔] created 1 managed nodegroup(s) in cluster "eksworkshop"
2022-04-09 16:43:50 [ℹ] checking security group configuration for all nodegroups
2022-04-09 16:43:50 [ℹ] all nodegroups have up-to-date cloudformation templates执行如下命令查看nodegroup是否正常。
eksctl get nodegroup --cluster eksworkshop返回结果可以看到原来nodegroup名为managed-ng与和新创建nodegroup名为newng同时被列出来如下。
2022-04-09 16:45:45 [ℹ] eksctl version 0.92.0
2022-04-09 16:45:45 [ℹ] using region ap-southeast-1
CLUSTER NODEGROUP STATUS CREATED MIN SIZE MAX SIZE DESIRED CAPACITY INSTANCE TYPE IMAGE ID ASG NAME TYPE
eksworkshop managed-ng ACTIVE 2022-04-09T04:34:33Z 3 9 6 t3.2xlarge AL2_x86_64 eks-managed-ng-64c0064d-112b-eeb2-f9be-87b0414216d7 managed
eksworkshop newng ACTIVE 2022-04-09T08:41:16Z 3 6 3 m5.2xlarge AL2_x86_64 eks-newng-14c006be-000e-1344-e82b-229371651c95 managed
2、删除旧的nodegroup
执行如下命令。
eksctl delete nodegroup --cluster eksworkshop --name managed-ng --region ap-southeast-1等待几分钟后，再次查询集群所对应的nodegroup，执行如下命令。
eksctl get nodegroup --cluster eksworkshop通过以上返回结果可以看到，原来规格的nodegroup被删除。