kubernetes（五）二进制安装-安装docker服务

部署docker服务（在master节点上执行）

  1. 下载和分发 docker 二进制文件

    cd /opt/k8s/work
wget https://download.docker.com/linux/static/stable/x86_64/docker-18.09.6.tgz
tar -xvf docker-18.09.6.tgz

  2. 分发二进制文件到所有 worker 节点

    cd /opt/k8s/work
export node_ip=192.168.0.114
scp docker/*  root@${node_ip}:/opt/k8s/bin/
ssh root@${node_ip} "chmod +x /opt/k8s/bin/*"

  3. 创建docker服务启动文件

    cd /opt/k8s/work
cat > docker.service <<"EOF"
[Unit]
Description=Docker Application Container Engine
Documentation=http://docs.docker.io

[Service]
WorkingDirectory=/data/k8s/docker
Environment="PATH=/opt/k8s/bin:/bin:/sbin:/usr/bin:/usr/sbin"
EnvironmentFile=-/run/flannel/docker
ExecStart=/opt/k8s/bin/dockerd $DOCKER_NETWORK_OPTIONS
ExecReload=/bin/kill -s HUP $MAINPID
Restart=on-failure
RestartSec=5
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
Delegate=yes
KillMode=process

[Install]
WantedBy=multi-user.target
EOF

    • EOF 前后有双引号，这样 bash 不会替换文档中的变量，如 $DOCKER_NETWORK_OPTIONS (这些环境变量是 systemd 负责替换的。)；

    • dockerd 运行时会调用其它 docker 命令，如 docker-proxy，所以需要将 docker 命令所在的目录加到 PATH 环境变量中；

    • flanneld 启动时将网络配置写入 /run/flannel/docker 文件中，dockerd 启动前读取该文件中的环境变量 DOCKER_NETWORK_OPTIONS ，然后设置 docker0 网桥网段；

    • docker 从 1.13 版本开始，可能将 iptables FORWARD chain的默认策略设置为DROP，从而导致 ping 其它 Node 上的 Pod IP 失败，遇到这种情况时，需要手动设置策略为 ACCEPT：

      export node_ip=192.168.0.114
ssh root@${node_ip}  "/sbin/iptables -P FORWARD ACCEPT"

  4. 分发 docker.service 文件到所有 worker 机器:

    cd /opt/k8s/work
export node_ip=192.168.0.114
scp docker.service root@${node_ip}:/etc/systemd/system/

  5. 配置和分发 docker 配置文件

    使用国内的仓库镜像服务器以加快 pull image 的速度，同时增加下载的并发数 (需要重启 dockerd 生效)：

    cd /opt/k8s/work
cat > docker-daemon.json <<EOF
{
    "registry-mirrors": ["https://docker.mirrors.ustc.edu.cn","https://hub-mirror.c.163.com"],
    "max-concurrent-downloads": 20,
    "live-restore": true,
    "max-concurrent-uploads": 10,
    "data-root": "/data/k8s/docker/data",
    "log-opts": {
      "max-size": "100m",
      "max-file": "5"
    }
}
EOF

  6. 分发 docker 配置文件到所有 worker 节点：

    cd /opt/k8s/work

export node_ip=192.168.0.114
ssh root@${node_ip} "mkdir -p  /etc/docker/ /data/k8s/docker/data"
scp docker-daemon.json root@${node_ip}:/etc/docker/daemon.json

  7. 启动 docker 服务

    export node_ip=192.168.0.114
ssh root@${node_ip} "systemctl daemon-reload && systemctl enable docker && systemctl restart docker"

  8. 检查服务运行状态

    export node_ip=192.168.0.114
ssh root@${node_ip} "systemctl status docker|grep Active"

    • 确保状态为 active (running)，否则查看日志，确认原因

    • 如果出现异常，通过如下命令查看

      journalctl -u docker

  9. 检查 docker0 网桥

    export node_ip=192.168.0.114
ssh root@${node_ip} "/sbin/ip addr show flannel.1 && /sbin/ip addr show docker0"

    • 确认各 worker 节点的 docker0 网桥和 flannel.1 接口的 IP 处于同一个网段中

      输出内容

      export node_ip=192.168.0.114
root@master:/opt/k8s/work# ssh root@${node_ip} "/sbin/ip addr show flannel.1 && /sbin/ip addr show docker0"
4: flannel.1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN group default
    link/ether f2:fc:0f:7e:98:e4 brd ff:ff:ff:ff:ff:ff
    inet 172.30.78.0/32 scope global flannel.1
       valid_lft forever preferred_lft forever
    inet6 fe80::f0fc:fff:fe7e:98e4/64 scope link
       valid_lft forever preferred_lft forever
5: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
    link/ether 02:42:fd:1f:8f:d8 brd ff:ff:ff:ff:ff:ff
    inet 172.30.78.1/24 brd 172.30.78.255 scope global docker0
       valid_lft forever preferred_lft forever

    • 注意: 如果您的服务安装顺序不对或者机器环境比较复杂, docker服务早于flanneld服务安装，此时 worker 节点的 docker0 网桥和 flannel.1 接口的 IP可能不会同处同一个网段下，这个时候请先停止docker服务, 手工删除docker0网卡，重新启动docker服务后即可修复

      systemctl stop docker
ip link delete docker0
systemctl start docker

  10. 查看 docker 的状态信息

    root@slave:/opt/k8s/work# docker info
Containers: 0
 Running: 0
 Paused: 0
 Stopped: 0
Images: 0
Server Version: 18.09.6
Storage Driver: overlay2
 Backing Filesystem: extfs
 Supports d_type: true
 Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
 Volume: local
 Network: bridge host macvlan null overlay
 Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: bb71b10fd8f58240ca47fbb579b9d1028eea7c84
runc version: 2b18fe1d885ee5083ef9f0838fee39b62d653e30
init version: fec3683
Security Options:
 apparmor
 seccomp
  Profile: default
Kernel Version: 5.0.0-23-generic
Operating System: Ubuntu 18.04.3 LTS
OSType: linux
Architecture: x86_64
CPUs: 4
Total Memory: 3.741GiB
Name: slave
ID: IDMG:7A6F:UNTP:IWVM:ZBK5:VHJ4:STC5:UXZX:HQT6:UUNE:YDOC:I27L
Docker Root Dir: /data/k8s/docker/data
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
 127.0.0.0/8
Registry Mirrors:
 https://docker.mirrors.ustc.edu.cn/
 https://hub-mirror.c.163.com/
Live Restore Enabled: true
Product License: Community Engine

WARNING: No swap limit support
posted @ 2020-03-29 20:35  高枫_henu  Views(426)  Comments(0)  Edit  收藏  举报