docker 安装配置

前言

正常操作到这里，k8s 的 master 集群已经安装完成，只需要添加node节点就可以了;

但也要把 master 节点都要通过 work 节点的组件，加入到master集群中；

kubernetes work节点运行如下组件:

docker、kubelet、kube-proxy、flanneld、kube-nginx

安装 docker

yum install docker-ce-18.09.6

如果这一步安装有问题，请查看 环境介绍与基础配置 中有个docker的阿里云源

创建配置文件

mkdir -p /etc/docker/
cat > /etc/docker/daemon.json <

修改Docker启动参数

EnvironmentFile=-/run/flannel/docker
ExecStart=/usr/bin/dockerd $DOCKER_NETWORK_OPTIONS -H fd:// --containerd=/run/containerd/containerd.sock

完整的如下

[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
BindsTo=containerd.service
After=network-online.target firewalld.service containerd.service
Wants=network-online.target
Requires=docker.socket

[Service]
Type=notify
# the default is not to use systemd for cgroups because the delegate issues still
# exists and systemd currently does not support the cgroup feature set required
# for containers run by docker
EnvironmentFile=-/run/flannel/docker
ExecStart=/usr/bin/dockerd $DOCKER_NETWORK_OPTIONS -H fd:// --containerd=/run/containerd/containerd.sock
ExecReload=/bin/kill -s HUP $MAINPID
TimeoutSec=0
RestartSec=2
Restart=always

# Note that StartLimit* options were moved from "Service" to "Unit" in systemd 229.
# Both the old, and new location are accepted by systemd 229 and up, so using the old location
# to make them work for either version of systemd.
StartLimitBurst=3

# Note that StartLimitInterval was renamed to StartLimitIntervalSec in systemd 230.
# Both the old, and new name are accepted by systemd 230 and up, so using the old name to make
# this option work for either version of systemd.
StartLimitInterval=60s

# Having non-zero Limit*s causes performance problems due to accounting overhead
# in the kernel. We recommend using cgroups to do container-local accounting.
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity

# Comment TasksMax if your systemd version does not supports it.
# Only systemd 226 and above support this option.
TasksMax=infinity

# set delegate yes so that systemd does not reset the cgroups of docker containers
Delegate=yes

# kill only the docker process, not all processes in the cgroup
KillMode=process

[Install]
WantedBy=multi-user.target

启动 docker 服务

source /opt/k8s/bin/environment.sh
for node_ip in ${NODE_IPS[@]}
  do
    echo ">>> ${node_ip}"
    ssh root@${node_ip} "systemctl daemon-reload && systemctl enable docker && systemctl restart docker"
  done

检查服务运行状态

source /opt/k8s/bin/environment.sh
for node_ip in ${NODE_IPS[@]}
  do
    echo ">>> ${node_ip}"
    ssh root@${node_ip} "systemctl status docker|grep Active"
  done

检查 docker0 网桥

source /opt/k8s/bin/environment.sh
for node_ip in ${NODE_IPS[@]}
  do
    echo ">>> ${node_ip}"
    ssh root@${node_ip} "/usr/sbin/ip addr show flannel.1 && /usr/sbin/ip addr show docker0"
  done

输出结果

>>> 10.0.20.11
6: flannel.1:  mtu 1450 qdisc noqueue state UNKNOWN group default 
    link/ether 2e:40:21:fe:5d:7a brd ff:ff:ff:ff:ff:ff
    inet 172.30.224.0/32 scope global flannel.1
       valid_lft forever preferred_lft forever
5: docker0:  mtu 1500 qdisc noqueue state DOWN group default 
    link/ether 02:42:39:44:2b:e5 brd ff:ff:ff:ff:ff:ff
    inet 172.30.224.1/21 brd 172.30.231.255 scope global docker0
       valid_lft forever preferred_lft forever
>>> 10.0.20.12
6: flannel.1:  mtu 1450 qdisc noqueue state UNKNOWN group default 
    link/ether a6:96:1a:04:30:d8 brd ff:ff:ff:ff:ff:ff
    inet 172.30.160.0/32 scope global flannel.1
       valid_lft forever preferred_lft forever
5: docker0:  mtu 1500 qdisc noqueue state DOWN group default 
    link/ether 02:42:68:50:cf:cb brd ff:ff:ff:ff:ff:ff
    inet 172.30.160.1/21 brd 172.30.167.255 scope global docker0
       valid_lft forever preferred_lft forever
>>> 10.0.20.13
6: flannel.1:  mtu 1450 qdisc noqueue state UNKNOWN group default 
    link/ether 2e:1d:82:42:52:d2 brd ff:ff:ff:ff:ff:ff
    inet 172.30.80.0/32 scope global flannel.1
       valid_lft forever preferred_lft forever
5: docker0:  mtu 1500 qdisc noqueue state DOWN group default 
    link/ether 02:42:f2:3f:88:e6 brd ff:ff:ff:ff:ff:ff
    inet 172.30.80.1/21 brd 172.30.87.255 scope global docker0
       valid_lft forever preferred_lft forever
>>> 10.0.20.14
6: flannel.1:  mtu 1450 qdisc noqueue state UNKNOWN group default 
    link/ether 16:00:ff:7a:69:93 brd ff:ff:ff:ff:ff:ff
    inet 172.30.48.0/32 scope global flannel.1
       valid_lft forever preferred_lft forever
5: docker0:  mtu 1500 qdisc noqueue state DOWN group default 
    link/ether 02:42:07:90:84:95 brd ff:ff:ff:ff:ff:ff
    inet 172.30.48.1/21 brd 172.30.55.255 scope global docker0
       valid_lft forever preferred_lft forever

到这里，flanneld 和 docker 之间网络建立完成。