클라우드 사용시 효율적인 리눅스 명령어

<1> 로드밸런서 분산 확인
<2> while 문
<3> 노드 IP 확인 및 PrivateIP 변수 지정



<1> 로드밸런서 분산 확인

1

[root@ip-10-2-1-128 ~]# more 5.sh

ALB=My-ALB-407199315.us-east-2.elb.amazonaws.com

for i in {1..20}; do curl $ALB -s -q ; done | sort | uniq -c | sort -nr


[root@ip-10-2-1-128 ~]# chmod 700 5.sh


[root@ip-10-2-1-128 ~]# ./5.sh



2

# 분산 접속 확인

NLB=$(kubectl get svc svc-nlb-ip-type -o jsonpath={.status.loadBalancer.ingress[0].hostname})





echo $NLB

(eks5-access@myeks:default) [root@myeks-bastion-EC2 ~]# echo $NLB

k8s-default-svcnlbip-d959415c0b-fb49155dc99f1dc2.elb.ap-northeast-2.amazonaws.com



(5분 걸림)





curl -s $NLB



for i in {1..100}; do curl -s $NLB | grep Hostname ; done | sort | uniq -c | sort -nr


5

# 지속적인 접속 시도 : 아래 상세 동작 확인 시 유용(패킷 덤프 등)

while true; do curl -s --connect-timeout 1 $NLB | egrep 'Hostname|client_address'; echo "----------" ; date "+%Y-%m-%d %H:%M:%S" ; sleep 1; done



6
curl -s $NLB

for i in {1..100}; do curl -s --connect-timeout 1 $NLB | grep Hostname ; done | sort | uniq -c | sort -nr



<2> while 문


1
while true; do  dig www.masterseo0.link ;sleep 3;done
 

2

while true; do aws ec2 describe-instances --query "Reservations[*].Instances[*].{PublicIPAdd:PublicIpAddress,PrivateIPAdd:PrivateIpAddress,InstanceName:Tags[?Key=='Name']|[0].Value,Status:State.Name}" --filters Name=instance-state-name,Values=running --output text ; echo "------------------------------" ; sleep 1; done

------------------------------

myeks-myeks-nodegroup-Node      192.168.2.48    54.180.105.93   running

myeks-host      192.168.1.100   15.165.76.115   running

myeks-myeks-nodegroup-Node      192.168.1.186   15.165.17.199   running




2
while true; do ip -br -c addr show && echo "--------------" ; date "+%Y-%m-%d %H:%M:%S" ; sleep 1; done






<3> 노드 IP 확인 및 PrivateIP 변수 지정


N1=$(kubectl get node --label-columns=topology.kubernetes.io/zone --selector=topology.kubernetes.io/zone=ap-northeast-2a -o jsonpath={.items[0].status.addresses[0].address})

N2=$(kubectl get node --label-columns=topology.kubernetes.io/zone --selector=topology.kubernetes.io/zone=ap-northeast-2b -o jsonpath={.items[0].status.addresses[0].address})

N3=$(kubectl get node --label-columns=topology.kubernetes.io/zone --selector=topology.kubernetes.io/zone=ap-northeast-2c -o jsonpath={.items[0].status.addresses[0].address})



echo "export N1=$N1" >> /etc/profile

echo "export N2=$N2" >> /etc/profile

echo "export N3=$N3" >> /etc/profile



echo $N1, $N2, $N3






같이보면 좋은책
https://brunch.co.kr/@topasvga/3581

감사합니다.