질문 하나 드립니다..

강의에서는 docker container가 돌고 있는 상태입니다. k8s는 cri라는 container runtime interface스펙에 맞는 컨테이너 런타임이면 설치해서 사용 가능합니다.

authorized key 질문

해결했습니다.

e다른 ip로 db접근시 오류

결론이Master Node에서mysql -u root -p -h ${Worker_Node ip} 명령어로 접속한것이 결국 db001 서비스에 접속한 것이 되는건가요 ?그리고 초기에 -e MYSQL_ROOT_PASSWORD 로 db001 서비스에 비번을 root로 주었는데 Worker Node에서 비번을 다시 root로 바꾸어야 접속이 되는 이유가 무엇인가요? 제 생각에는 마스터에서 워커 노드 ip로 접속을 할 때 클러스터 내부의 db001컨테이너에 접속이 되는 것이 아닌 그냥 워커 노드 서버의 mysql에 접속하고 있는것 같습니다.

e다른 ip로 db접근시 오류

각 서버에 3306 열려있습니다

e다른 ip로 db접근시 오류

111오류가 아닌 110 오류입니다.

nginx.conf 수정관련

감사합니다 덕분에 살았어요 ㅋㅋㅋㅋㅋㅋ

docker run -d -p 9999:80 명령어에 대해

1)ec2 환경의 보안 그룹 인바운드 옵션에 9999포트를 열어주면 내 컴퓨터에 9999번 포트로 상대방이 요청을 할 수 있습니다. 실습환경이 ec2 서버 안에 도커아파치 서버(컨테이너)가 있습니다 웹 데몬 서버는 80(http)번 프로토콜로 클라이언트의 http요청을 대기합니다. 그래서 외부에서 ec2(내 컴퓨터) 9999번으로 들어오면 아파치80 번으로 들어오게끔 매칭을 시켜준 것입니다. 하나의 포트포워딩 개념입니다.클라이언트 -> 9999번 요청 -> 9999번이열린 컴퓨터(ec2) -> 9999번으로 들어온 것을 80번 으로 보내라 -> 80번은 웹서버 2) 아파치2 웹 서버의 기본 파일 경로입니다. 해당 디렉터리에 html 문서를 넣고 인터넷에서 아파치 서버로 접속하면 그 html 문서가 나옵니다. 3) 컨테이너는 커널을 포함하지 않고 커널 외부 요소만 포함한 경량 서버 단위라고 할 수 있습니다. 그래서 경량화를 하는것입니다. 하나가 들어갈 때도 있고 여러개가 들어갈 때도 있습니다. 어떤 서비스를 운영하느냐에 따라 다릅니다.

블로그 정리에 사용해도 괜찮나요?

비공개로 하셔야 되요

설치에러

혹시 해결하셨나요? 같은 문제가 나오고 있는데 2일째 해결 못하는 중이에요 ㅠㅠ

varant up 오류

vagrant-vbguest 0.30 일때$ vagrant upBringing machine 'cent1' up with 'virtualbox' provider...Bringing machine 'cent2' up with 'virtualbox' provider...Bringing machine 'cent3' up with 'virtualbox' provider...==> cent1: Preparing master VM for linked clones... cent1: This is a one time operation. Once the master VM is prepared, cent1: it will be used as a base for linked clones, making the creation cent1: of new VMs take milliseconds on a modern system.==> cent1: Importing base box 'rockylinux/8'...==> cent1: Cloning VM...==> cent1: Matching MAC address for NAT networking...==> cent1: Checking if box 'rockylinux/8' version '5.0.0' is up to date...==> cent1: Setting the name of the VM: cent1==> cent1: Clearing any previously set network interfaces...==> cent1: Preparing network interfaces based on configuration... cent1: Adapter 1: nat cent1: Adapter 2: hostonly cent1: Adapter 3: hostonly==> cent1: Forwarding ports... cent1: 22 (guest) => 2222 (host) (adapter 1)==> cent1: Running 'pre-boot' VM customizations...==> cent1: Booting VM...==> cent1: Waiting for machine to boot. This may take a few minutes... cent1: SSH address: 127.0.0.1:2222 cent1: SSH username: vagrant cent1: SSH auth method: private key cent1: cent1: Vagrant insecure key detected. Vagrant will automatically replace cent1: this with a newly generated keypair for better security. cent1: cent1: Inserting generated public key within guest... cent1: Removing insecure key from the guest if it's present... cent1: Key inserted! Disconnecting and reconnecting using new SSH key...==> cent1: Machine booted and ready![cent1] No Virtualbox Guest Additions installation found.Last metadata expiration check: 0:00:03 ago on Wed 05 Oct 2022 01:15:33 PM UTC.Package rocky-release-8.5-3.el8.noarch is already installed.Dependencies resolved.================================================================================ Package Architecture Version Repository Size================================================================================Upgrading: rocky-release noarch 8.6-4.el8 baseos 21 k rocky-repos noarch 8.6-4.el8 baseos 14 kTransaction Summary================================================================================Upgrade 2 PackagesTotal download size: 35 kDownloading Packages:(1/2): rocky-repos-8.6-4.el8.noarch.rpm 421 kB/s | 14 kB 00:00(2/2): rocky-release-8.6-4.el8.noarch.rpm 589 kB/s | 21 kB 00:00--------------------------------------------------------------------------------Total 57 kB/s | 35 kB 00:00Running transaction checkTransaction check succeeded.Running transaction testTransaction test succeeded.Running transaction Preparing : 1/1 Running scriptlet: rocky-repos-8.6-4.el8.noarch 1/1 Upgrading : rocky-repos-8.6-4.el8.noarch 1/4 Upgrading : rocky-release-8.6-4.el8.noarch 2/4 Cleanup : rocky-release-8.5-3.el8.noarch 3/4 Cleanup : rocky-repos-8.5-3.el8.noarch 4/4 Running scriptlet: rocky-repos-8.5-3.el8.noarch 4/4 Verifying : rocky-release-8.6-4.el8.noarch 1/4 Verifying : rocky-release-8.5-3.el8.noarch 2/4 Verifying : rocky-repos-8.6-4.el8.noarch 3/4 Verifying : rocky-repos-8.5-3.el8.noarch 4/4Upgraded: rocky-release-8.6-4.el8.noarch rocky-repos-8.6-4.el8.noarchComplete!Last metadata expiration check: 0:00:05 ago on Wed 05 Oct 2022 01:15:33 PM UTC.No match for argument: kernel-devel-4.18.0-348.20.1.el8_5.x86_64Error: Unable to find a match: kernel-devel-4.18.0-348.20.1.el8_5.x86_64Unmounting Virtualbox Guest Additions ISO from: /mntumount: /mnt: not mounted.==> cent1: Checking for guest additions in VM... cent1: No guest additions were detected on the base box for this VM! Guest cent1: additions are required for forwarded ports, shared folders, host only cent1: networking, and more. If SSH fails on this machine, please install cent1: the guest additions and repackage the box to continue. cent1: cent1: This is not an error message; everything may continue to work properly, cent1: in which case you may ignore this message.The following SSH command responded with a non-zero exit status.Vagrant assumes that this means the command failed!umount /mntStdout from the command:Stderr from the command:umount: /mnt: not mounted. vagrant-vbguest 0.21 일때 cent1: cent1: Complete!==> cent1: Running provisioner: shell... cent1: Running: C:/Users/junbo/AppData/Local/Temp/vagrant-shell20221005-3480-v071rw.sh cent1: hosts에 각 서버를 등록합니다. cent1: fstab에 nfs정보를 등록합니다. cent1: root유저의 환경설정을 합니다. cent1: ssh 설정을 등록합니다. cent1: 서버 접속 메세지를 설정합니다. cent1: selinux를 무효화합니다. cent1: 처리항목에 없는 서버입니다. 호스트를 확인해주세요. cent1: 서버를 재시작합니다.==> cent2: Cloning VM...==> cent2: Matching MAC address for NAT networking...==> cent2: Checking if box 'rockylinux/8' version '5.0.0' is up to date...==> cent2: Setting the name of the VM: cent2==> cent2: Fixed port collision for 22 => 2222. Now on port 2200.==> cent2: Clearing any previously set network interfaces...==> cent2: Preparing network interfaces based on configuration... cent2: Adapter 1: nat cent2: Adapter 2: hostonly cent2: Adapter 3: hostonly==> cent2: Forwarding ports... cent2: 22 (guest) => 2200 (host) (adapter 1)==> cent2: Running 'pre-boot' VM customizations...==> cent2: Booting VM...==> cent2: Waiting for machine to boot. This may take a few minutes... cent2: SSH address: 127.0.0.1:2200 cent2: SSH username: vagrant cent2: SSH auth method: private key cent2: cent2: Vagrant insecure key detected. Vagrant will automatically replace cent2: this with a newly generated keypair for better security. cent2: cent2: Inserting generated public key within guest... cent2: Removing insecure key from the guest if it's present... cent2: Key inserted! Disconnecting and reconnecting using new SSH key...==> cent2: Machine booted and ready![cent2] No Virtualbox Guest Additions installation found.Last metadata expiration check: 0:00:01 ago on Wed 05 Oct 2022 01:25:18 PM UTC.Package rocky-release-8.5-3.el8.noarch is already installed.Dependencies resolved.================================================================================ Package Architecture Version Repository Size================================================================================Upgrading: rocky-release noarch 8.6-4.el8 baseos 21 k rocky-repos noarch 8.6-4.el8 baseos 14 kTransaction Summary================================================================================Upgrade 2 PackagesTotal download size: 35 kDownloading Packages:(1/2): rocky-repos-8.6-4.el8.noarch.rpm 454 kB/s | 14 kB 00:00(2/2): rocky-release-8.6-4.el8.noarch.rpm 477 kB/s | 21 kB 00:00--------------------------------------------------------------------------------Total 27 kB/s | 35 kB 00:01 Running transaction checkTransaction check succeeded.Running transaction testTransaction test succeeded.Running transaction Preparing : 1/1 Running scriptlet: rocky-repos-8.6-4.el8.noarch 1/1 Upgrading : rocky-repos-8.6-4.el8.noarch 1/4 Upgrading : rocky-release-8.6-4.el8.noarch 2/4 Cleanup : rocky-release-8.5-3.el8.noarch 3/4 Cleanup : rocky-repos-8.5-3.el8.noarch 4/4 Running scriptlet: rocky-repos-8.5-3.el8.noarch 4/4 Verifying : rocky-release-8.6-4.el8.noarch 1/4 Verifying : rocky-release-8.5-3.el8.noarch 2/4 Verifying : rocky-repos-8.6-4.el8.noarch 3/4 Verifying : rocky-repos-8.5-3.el8.noarch 4/4Upgraded: rocky-release-8.6-4.el8.noarch rocky-repos-8.6-4.el8.noarchComplete!Error: Unknown repo: 'C*-base'==> cent2: Checking for guest additions in VM... cent2: No guest additions were detected on the base box for this VM! Guest cent2: additions are required for forwarded ports, shared folders, host only cent2: networking, and more. If SSH fails on this machine, please install cent2: the guest additions and repackage the box to continue. cent2: cent2: This is not an error message; everything may continue to work properly, cent2: in which case you may ignore this message.The following SSH command responded with a non-zero exit status.Vagrant assumes that this means the command failed!yum install -y kernel-devel-`uname -r` --enablerepo=C*-base --enablerepo=C*-updatesStdout from the command:Stderr from the command:Error: Unknown repo: 'C*-base'(사진)