搭建docker+k8s踩过的坑

问题一：

# yum install -y etcd kubernetes
Error: docker-ce-cli conflicts with :docker-1.13.-.gitb2f74b2.el7.centos.x86_64
Error: docker-ce conflicts with :docker-1.13.-.gitb2f74b2.el7.centos.x86_64

原因：

　　安装kubernetes之前已经安装了docker

解决方法：卸载docker服务

　　卸载docker：yum remove -y 'rpm -qa |grep docker'

　　删除容器镜像：rm -rf /var/lib/docker

再次安装kubernetes，安装成功，而且会自动安装docker

问题二：

2.1

# etcdctl mk /atomic.io/network/config '{"Network":"192.168.3.4/16"}'
Error:  client: etcd cluster is unavailable or misconfigured; error #: dial tcp 127.0.0.1:: connect: connection refused; error #: dial tcp 127.0.0.1:: connect: connection refused
error #: dial tcp 127.0.0.1:: connect: connection refused
error #: dial tcp 127.0.0.1:: connect: connection refused

原因： 
　　如果出现如上的错误，是因为ETCD_LISTEN_CLIENT_URLS参数没有配置http://127.0.0.1:2379而导致的
解决方法：
　　将 # /etc/etcd/etcd.conf 中的ETCD_LISTEN_CLIENT_URLS参数改为: 
　　ETCD_LISTEN_CLIENT_URLS="http://127.0.0.1:2379"

2.2

# etcdctl mk /atomic.io/network/config '{"Network":"192.168.3.4/16"}'
Error:  dial tcp 192.168.3.4:: connect: connection refused

原因：

　　ETCD_LISTEN_CLIENT_URLS参数没有配置本地ip “http://192.168.3.4:2379” 而导致的

解决方法：　

将 # /etc/etcd/etcd.conf 中的ETCD_LISTEN_CLIENT_URLS参数改为:
ETCD_LISTEN_CLIENT_URLS="http://192.168.37.49:2379,http://127.0.0.1:2379"

问题三：启动docker服务失败

# systemctl status docker
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
  Drop-In: /usr/lib/systemd/system/docker.service.d
           └─flannel.conf
   Active: failed (Result: exit-code) since Tue -- :: CST; 4min 15s ago
     Docs: http://docs.docker.com
  Process:  ExecStart=/usr/bin/dockerd-current --add-runtime docker-runc=/usr/libexec/docker/docker-runc-current --default-runtime=docker-runc --exec-opt native.cgroupdriver=systemd --userland-proxy-path=/usr/libexec/docker/docker-proxy-current --init-path=/usr/libexec/docker/docker-init-current --seccomp-profile=/etc/docker/seccomp.json $OPTIONS $DOCKER_STORAGE_OPTIONS $DOCKER_NETWORK_OPTIONS $ADD_REGISTRY $BLOCK_REGISTRY $INSECURE_REGISTRY $REGISTRIES (code=exited, status=/FAILURE)
 Main PID:  (code=exited, status=/FAILURE)

Jun  :: localhost.localdomain systemd[]: Starting Docker Application Container Engine...
Jun  :: localhost.localdomain dockerd-current[]: unable to configure the Docker daemon with file /etc/docker/daemon.json: the following directives are specified both as a flag and in the configuration file:...rom file: )
Jun  :: localhost.localdomain systemd[]: docker.service: main process exited, code=exited, status=/FAILURE
Jun  :: localhost.localdomain systemd[]: Failed to start Docker Application Container Engine.
Jun  :: localhost.localdomain systemd[]: Unit docker.service entered failed state.
Jun  :: localhost.localdomain systemd[]: docker.service failed.

原因是：
　　安装kubernets之前安装过的docker残留文件影响了kubernets安装的docker启动
解决方法：
　　将/etc/docker/daemon.json删除，重新启动即可。

问题四：创建k8s管理mysql的pod时：

# kubectl create -f mysql.yaml
error: error validating "mysql.yaml": error validating data: couldn't find type: v1beta1.Deployment; if you choose to ignore these errors, turn validation off with --validate=false

原因：
kubectl 的版本是1.5版本的
# kubectl version
Client Version: version.Info{Major:"1", Minor:"5", GitVersion:"v1.5.2", GitCommit:"269f928217957e7126dc87e6adfa82242bfe5b1e", GitTreeState:"clean", BuildDate:"2017-07-03T15:31:10Z", GoVersion:"go1.7.4", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"5", GitVersion:"v1.5.2", GitCommit:"269f928217957e7126dc87e6adfa82242bfe5b1e", GitTreeState:"clean", BuildDate:"2017-07-03T15:31:10Z", GoVersion:"go1.7.4", Compiler:"gc", Platform:"linux/amd64"}

 解决方法：
将mysql.yaml脚本中的 “ apiVersion: apps/v1beta1 ” 改为 “apiVersion: extensions/v1beta1 ” 即可

不同的apiversion解释：
apps  API组将是v1部署类型所在的位置 .   apps/v1beta1 版本已在1.6.0中添加，因此如果您有1.5.x客户端或服务器，则仍应使用 extensions/v1beta1 版本 .
apps/v1beta1 和 extensions/v1beta1 部署类型相同，但在通过 apps  API创建时，会使用一些改进的默认值