CoreDNS 安裝教學 in Centos8

⚓CoreDNS 安裝教學 in Centos8(🐳Docker)

tags: coreDNS docker centos el8

安裝Docker

• step 1 Add docker repo

  $ sudo dnf config-manager --add-repo=https://download.docker.com/linux/centos/docker-ce.repo

• step 2 Installing docker-ce 相關依賴套件

  • buildah
  • podman
  • containerd.io > 1.2.0-3.el7

    $ sudo dnf -y install buildah && dnf -y install podman

• step 2.5 Manual Installing containerd.io

  版本號 1.2.13-3.2 可更換最新的 
  $ sudo dnf -y install https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.13-3.2.el7.x86_64.rpm

• step 3 Installing docker-ce

  $ sudo dnf -y install docker-ce

• step 4 關閉防火牆(會造成docker內部橋接網路不通)

  $ sudo systemctl disable firewalld

• step 5 Start and enable the docker daemon

  設定為daemon啟動
  $ sudo systemctl enable --now docker
  
  檢查是否啟動
  $ sudo systemctl is-active docker
  
  檢查是否自動啟動
  $ sudo systemctl is-enabled docker

• step 6 Installing docker-compose（手動方式）

  下載可執行檔案 1.27.0-rc3 可更換最新的
  $ curl -L "https://github.com/docker/compose/releases/download/1.27.0-rc3/docker-compose-$(uname -s)-$(uname -m)" -o docker-compose
  加可執行and傳到/usr/local/bin底下
  $ sudo mv docker-compose /usr/local/bin && sudo chmod +x /usr/local/bin/docker-compose

  :::info
  ==番外== testing docker

  $ sudo docker run --rm --name=linuxconfig-test -p 80:80 httpd 
  如果成功用瀏覽器在自己的ip打開 會看到it's work!

  $ sudo docker rmi httpd
  刪除測試用httpd

  :::

安裝CoreDNS

• step 1 dockerhub 上抓coredn的映像檔

  $ sudo docker pull coredns/coredns

• step 2 config coredns

  • docker-compose.yml

    $ sudo mkdir -p docker/coredns/config && cd docker/coredns && vim docker-compose.yml

    version: '3.8'
    services:
      coredns:
          image: coredns/coredns:latest
          container_name: coredns
          restart: always
          expose:
              - '53'
              - '53/udp'
          ports:
              - '53:53'
              - '53:53/udp'
          volumes:
              - '$PWD/config/:/etc/coredns/'
          command:
              - '-conf'
              - '/etc/coredns/Corefile'

  • Corefile

    $ sudo vim config/Corefile

    .:53 {
        forward . 8.8.8.8:53
        log
        errors
    }
    
    mis {
        file /etc/coredns/mis
        log
        errors
    }

  • mis

    $ sudo vim config/mis

    $TTL 10
    @     IN  SOA     ns1.service. root.ns.service. (
                2   ;serial
                300 ; refresh
                1800 ; retry
                10  ; expire
                300 ; minimum
    )
    
    ;name servers
    @       IN      NS      ns1.service.
    ns1.service.    IN A 10.20.10.246
    vcsa   IN A 192.168.9.200
    esxi201 IN A 192.168.9.201
    esxi202 IN A 192.168.9.202
    esxi203 IN A 192.168.9.203
    esxi204 IN A 192.168.9.204
    esxi205 IN A 192.168.9.205
    esxi206 IN A 192.168.9.206
    esxi207 IN A 192.168.9.207
    esxi208 IN A 192.168.9.208
    esxi209 IN A 192.168.9.209
    esxi210 IN A 192.168.9.210

• step 3 Run docker-compose

enable

$ sudo docker-compose up -d

restart

$ sudo docker-compose restart coredns
or
$ sudo docker restart coredns