014.Kubernetes二進制部署docker

一 部署docker

1.1 部署docker組件

docker 運行和管理容器，kubelet 經過 Container Runtime Interface (CRI) 與它進行交互。

1.2 下載docker

  1 [root@k8smaster01 ~]# cd /opt/k8s/work
  2 [root@k8smaster01 work]# wget https://download.docker.com/linux/static/stable/x86_64/docker-18.09.6.tgz
  3 [root@k8smaster01 work]# tar -xvf docker-18.09.6.tgz

提示：更多docker版本下載參考https://download.docker.com/linux/static/stable/x86_64/。

1.3 安裝和部署docker

  1 [root@k8smaster01 ~]# cd /opt/k8s/work
  2 [root@k8smaster01 work]# source /opt/k8s/bin/environment.sh
  3 [root@k8smaster01 work]# for all_ip in ${ALL_IPS[@]}
  4   do
  5     echo ">>> ${all_ip}"
  6     scp docker/*  root@${all_ip}:/opt/k8s/bin/
 7     ssh root@${all_ip} "chmod +x /opt/k8s/bin/*"
 8   done

1.4 配置docker system

  1 [root@k8smaster01 ~]# cd /opt/k8s/work
  2 [root@k8smaster01 work]# cat > docker.service <<"EOF"
  3 [Unit]
  4 Description=Docker Application Container Engine
  5 Documentation=http://docs.docker.io
  6 
  7 [Service]
  8 WorkingDirectory=##DOCKER_DIR##
  9 Environment="PATH=/opt/k8s/bin:/bin:/sbin:/usr/bin:/usr/sbin"
 10 EnvironmentFile=-/run/flannel/docker
 11 ExecStart=/opt/k8s/bin/dockerd $DOCKER_NETWORK_OPTIONS
 12 ExecReload=/bin/kill -s HUP $MAINPID
 13 Restart=on-failure
 14 RestartSec=5
 15 LimitNOFILE=infinity
 16 LimitNPROC=infinity
 17 LimitCORE=infinity
 18 Delegate=yes
 19 KillMode=process
 20 
 21 [Install]
 22 WantedBy=multi-user.target
 23 EOF

解釋：

• EOF 先後有雙引號，這樣 bash 不會替換文檔中的變量，如 $DOCKER_NETWORK_OPTIONS (這些環境變量是 systemd 負責替換的。)；
• dockerd 運行時會調用其它 docker 命令，如 docker-proxy，因此須要將 docker 命令所在的目錄加到 PATH 環境變量中；
• flanneld 啓動時將網絡配置寫入 /run/flannel/docker 文件中，dockerd 啓動前讀取該文件中的環境變量 DOCKER_NETWORK_OPTIONS ，而後設置 docker0 網橋網段；
• 若是指定了多個 EnvironmentFile 選項，則必須將 /run/flannel/docker 放在最後(確保 docker0 使用 flanneld 生成的 bip 參數)；
• docker 須要以 root 用於運行；
• docker 從 1.13 版本開始，可能將 iptables FORWARD chain的默認策略設置爲DROP，從而致使 ping 其它 Node 上的 Pod IP 失敗，遇到這種狀況時，須要手動設置策略爲 ACCEPT：

  1 [root@k8smaster01 ~]# echo '/sbin/iptables -P FORWARD ACCEPT' >> /etc/rc.local

而且把如下命令寫入 /etc/rc.local 文件中，防止節點重啓iptables FORWARD chain的默認策略又還原爲DROP

1.5 分發docker systemd

  1 [root@k8smaster01 ~]# cd /opt/k8s/work
  2 [root@k8smaster01 work]# source /opt/k8s/bin/environment.sh
  3 [root@k8smaster01 work]# sed -i -e "s|##DOCKER_DIR##|${DOCKER_DIR}|" docker.service
  4 [root@k8smaster01 work]# for all_ip in ${ALL_IPS[@]}
  5   do
  6     echo ">>> ${all_ip}"
  7     scp docker.service root@${all_ip}:/etc/systemd/system/
  8   done

1.6 配置docker配置文件

  1 [root@k8smaster01 ~]# cd /opt/k8s/work
  2 [root@k8smaster01 work]# source /opt/k8s/bin/environment.sh
  3 [root@k8smaster01 work]# cat > docker-daemon.json <<EOF
  4 {
  5     "registry-mirrors": ["https://docker.mirrors.ustc.edu.cn","https://hub-mirror.c.163.com"],
  6     "insecure-registries": ["docker02:35000"],
  7     "max-concurrent-downloads": 20,
  8     "live-restore": true,
  9     "max-concurrent-uploads": 10,
 10     "debug": true,
 11     "data-root": "${DOCKER_DIR}/data",
 12     "exec-root": "${DOCKER_DIR}/exec",
 13     "log-opts": {
 14       "max-size": "100m",
 15       "max-file": "5"
 16     }
 17 }
 18 EOF

1.7 分發docker配置文件

  1 [root@k8smaster01 ~]# cd /opt/k8s/work
  2 [root@k8smaster01 work]# source /opt/k8s/bin/environment.sh
  3 [root@k8smaster01 work]# for all_ip in ${ALL_IPS[@]}
  4   do
  5     echo ">>> ${all_ip}"
  6     ssh root@${all_ip} "mkdir -p /etc/docker/ ${DOCKER_DIR}/{data,exec}"
  7     scp docker-daemon.json root@${all_ip}:/etc/docker/daemon.json
  8   done

二 啓動並驗證

2.1 啓動docker

  1 [root@k8smaster01 ~]# source /opt/k8s/bin/environment.sh
  2 [root@k8smaster01 ~]# for all_ip in ${ALL_IPS[@]}
  3   do
  4     echo ">>> ${all_ip}"
  5     ssh root@${all_ip} "systemctl daemon-reload && systemctl enable docker && systemctl restart docker"
  6   done

2.2 檢查docker服務

  1 [root@k8smaster01 ~]# source /opt/k8s/bin/environment.sh
  2 [root@k8smaster01 ~]# for all_ip in ${ALL_IPS[@]}
  3   do
  4     echo ">>> ${all_ip}"
  5     ssh root@${all_ip} "systemctl status docker|grep Active"
  6   done

2.3 檢查docker 0網橋

  1 [root@k8smaster01 ~]# source /opt/k8s/bin/environment.sh
  2 [root@k8smaster01 ~]# for all_ip in ${ALL_IPS[@]}
  3   do
  4     echo ">>> ${all_ip}"
  5     ssh root@${all_ip} "/usr/sbin/ip addr show flannel.1 && /usr/sbin/ip addr show docker0"
  6   done

提示：確認各 worker 節點的 docker0 網橋和 flannel.1 接口的 IP 處於同對應的相同網段中。

2.4 查看docker信息

  1 [root@k8smaster01 ~]# ps -elfH|grep docker | grep -v grep
  2 [root@k8smaster01 ~]# docker info