kunernetes & docker

从零开始学习kunernetes & docker

  • 安装
    yum install -y etcd kubernetes
    -y : 默认yes
  • 修改配置
    1. 修改docker的配置文件/etc/sysconfig/docker,找到其中selinux-enabled位置
      修改为: OPTIONS='--selinux-enabled=false --insecure-registry gcr.io'
      gcr.io是配置的镜像仓库地址,可能需要科学上网。
    2. 修改kube-apiserver配置/etc/kubernetes/apiserver,删除–admission_control的ServiceAccount
  • 启动
    首先应该先关闭防火墙:
    systemctl disable firewalld
    systemctl stop firewalld
    服务列表: systemctl start etcd systemctl start docker systemctl start kube-apiserver systemctl start kube-controller-manager systemctl start kube-scheduler systemctl start kubelet systemctl start kube-proxy 按顺序启动上述服务,etcd是k8s的主数据库,所以必须先于kube服务前启动。

依赖关系:
etcd -> kube-apiserver kube-apiserver -> kube-controller-manager kube-apiserver -> kube-scheduler docker -> kubelet network -> kube-proxy 可能出现的问题:

  • docker启动报错
    _config.yml 解决方案:比较暴力点的就是卸载docker,然后重装k8s,会单独修复docker模块。
    yum remove docker
    yum install -y kubernetes
  • 首次创建kube yaml文件创建rc时,出现”kubernetes启动容器时,容器一直是ContainerCreating不能running”,之后按照解决方案1执行到
    docker pull registry.access.redhat.com/rhel7/pod-infrastructure:latest
    报错”open /etc/docker/certs.d/registry.access.redhat.com/redhat-ca.crt: no such file or”
    解决方案2
Written on September 7, 2018