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前言
Docker容器卷是一个特殊目录，它存放在宿主机的文件系统中，可供一个或多个容器使用。这种卷绕过了联合文件系统（Union File
System），可以提供很多有用的特性。例如，对数据卷的修改会立即生效，对数据卷的更新不会影响镜像，此外，数据卷会在容器被删除后依然存在。
卷的本质是文件或者目录，其设计目的就是解决数据的持久化问题，使得数据独立于容器的生存周期。这样即使容器被删除，对应的数据文件也不会消失，从而实现了数据
persistency。
docker run：
docker run ：创建一个新的容器并运行一个命令，是将镜像放入容器并启动容器。
docker run一般需要跟几个参数，如下所示：
docker run -d -v /root/:/root/:ro -v /etc/:/etc/ -v /var/log/:/var/log/ -v
/etc/localtime:/etc/localtime:ro --net=host --privileged=true --name
neutron-deployment xxxxxx /bin/bash -c "while true; do ls /root ;sleep 1;done"
举个例子，前面的 /root/ 是宿主机目录，后面的 /root/ 是容器内的目录。这个命令将宿主机的 /root/ 目录挂载到容器的 /root/
目录上，并且以只读方式（:ro）进行挂载。 之后的root目录下文件，宿主机跟容器就是双向同步了。xxxx是镜像名称，自行修改。
-i: 以交互模式运行容器，通常与 -t 同时使用；
-t: 为容器重新分配一个伪输入终端，通常与 -i 同时使用；
–name: 为容器指定一个名称；
-p: 指定端口映射，格式为：主机(宿主)端口:容器端口；
-e: 设置环境变量；
-d:运行的镜像名，并返回容器ID；
但是有时候我们是用kubectl apply 来拉起镜像
在yaml中
注意下面的containers下面的
volumeMounts是容器中的目录，下面的volumes是宿主机中的目录，他们的名字name要一致，相当于也是跟docker run一样的效果
containers: - workingDir: /apps/conf name: neutron-server image: xxxxxx
imagePullPolicy: IfNotPresent volumeMounts: - mountPath: /etc/passwd name:
sys-passwd readOnly: true - mountPath: /etc/shadow name: sys-shadow readOnly:
true volumes: - name: sys-passwd hostPath: path: /etc/passwd - name: sys-shadow
hostPath: path: /etc/shadow
