书籍来源：《CKA/CKAD应试指南：从Docker到Kubernetes完全攻略》
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使用emptyDir的存储方式，就类似于在创建docker容器时的命令docker run -v /xx，意思是在物理机里随机地产生一个目录（这个目录其实挂载的是物理机内存），然后把这个目录挂载到容器的/xx目录里。如果xx目录不存在，会自动在容器里创建，不过当删除pod时，emptyDir对应的目录会被一起删除，因为这种存储是临时性的，是以内存作为介质的，并非是永久性的。
为了和其他章节创建的pod做区别，本章所有实验均在一个新的命令空间里操作。
步骤1：创建命名空间nsvolume并切换至此命名空间。
##########实操验证##########
[root@vms10 ~]# kubectl create ns nsvolume
namespace/nsvolume created
[root@vms10 ~]#
[root@vms10 ~]# kubens nsvolume
Context "kubernetes-admin@kubernetes" modified.
Active namespace is "nsvolume".
[root@vms10 ~]# 本章所涉及的文件全部放在一个目录volume里。
步骤2：创建目录volume并cd进去。
##########实操验证##########
[root@vms10 ~]# mkdir volume ; cd volume/
[root@vms10 volume]# 步骤3：创建一个pod的yaml文件emp.yaml，按如下内容进行修改。
##########实操验证##########
[root@vms10 volume]# cat emp.yaml
apiVersion: v1
kind: Pod
metadata:
name: demo
labels:
aa: aa
spec:
volumes:
- name: volume1
emptyDir: {}
- name: volume2
emptyDir: {}
containers:
- name: demo1
image: busybox
imagePullPolicy: IfNotPresent
command: ['sh', '-c', 'sleep 5000']
volumeMounts:
- mountPath: /xx
name: volume1
- name: demo2
image: busybox
imagePullPolicy: IfNotPresent
command: ['sh', '-c', 'sleep 5000']
volumeMounts:
- mountPath: /xx
name: volume1
[root@vms10 volume]# 这个yaml文件里在volumes字段下创建卷，这里创建了2个名字为volume1和volume2的卷，类型都是emptyDir，在此pod里创建了2个容器demo1和demo2。在每个容器里通过volumeMounts选项来挂载卷，其中name指定挂载哪个卷，mountPath指定了卷在本容器里的挂载点，这里两个容器都是把卷volume1挂载到容器的/xx目录里。
注意：如果容器里的目录/xx不存在的话，则会自动创建。
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步骤4：创建pod并查看pod运行状态。
##########实操验证##########
[root@vms10 volume]# kubectl apply -f emp.yaml
pod/demo created
[root@vms10 volume]# kubectl get pods
NAME READY STATUS RESTARTS AGE
demo 2/2 Running 0 5s
[root@vms10 volume]# 步骤5：查看此pod的描述信息。
##########实操验证##########
[root@vms10 volume]# kubectl describe pod demo | grep -A2 Volumes
Volumes:
volume1:
Type: EmptyDir (a temporary directory that shares a pod's lifetime)
[root@vms10 volume]# 可以看到此pod现在使用的是emptyDir类型的存储。
步骤6：查看pod运行在哪台主机。
##########实操验证##########
[root@vms10 volume]# kubectl get pods -o wide --no-headers
demo 2/2 Running 0 74s 10.244.14.21 vms12.rhce.cc <none> <none>
[root@vms10 volume]# 步骤7：切换到vms12机器，找到对应的容器。
##########实操验证##########
[root@vms12 ~]# docker ps | grep demo
eb0b3c97308c 7cfbbec8963d "sh -c 'sleep 5000'" About a minute ago Up About a minute k8s_demo2_demo_nsvolume_f690d17c-478d-4f58-bd3e-6249b33d902a_0
c27ff5aafcdf 7cfbbec8963d "sh -c 'sleep 5000'" About a minute ago Up About a minute k8s_demo1_demo_nsvolume_f690d17c-478d-4f58-bd3e-6249b33d902a_0
358fa6a3bf58 registry.aliyuncs.com/google_containers/pause:3.2 "/pause" About a minute ago Up About a minute k8s_POD_demo_nsvolume_f690d17c-478d-4f58-bd3e-6249b33d902a_0
[root@vms12 ~]# 可以看到在master上创建的demo这个pod所对应的两个容器的id分别是d3150d1c569e和5e9c9e41b8ea。
步骤8：查看它们对应的属性。
##########实操验证##########
[root@vms12 ~]# docker inspect eb0b3c97308c
[
{
"Id": "eb0b3c97308c3f6d5fc44359ddaa37b53b0d8c2fd958c2798a0554ddbdccd760",
"Created": "2023-05-30T05:36:01.59596029Z",
"Path": "sh",
"Args": [
"-c",
"sleep 5000"
],
"State": {
"Status": "running",
"Running": true,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"Dead": false,
"Pid": 66772,
"ExitCode": 0,
"Error": "",
"StartedAt": "2023-05-30T05:36:01.705496703Z",
"FinishedAt": "0001-01-01T00:00:00Z"
},
"Image": "sha256:7cfbbec8963d8f13e6c70416d6592e1cc10f47a348131290a55d43c3acab3fb9",
"ResolvConfPath": "/var/lib/docker/containers/358fa6a3bf58c602edf1da39ecf34881c419b660965f682f37c241acaf50ca4a/resolv.conf",
"HostnamePath": "/var/lib/docker/containers/358fa6a3bf58c602edf1da39ecf34881c419b660965f682f37c241acaf50ca4a/hostname",
"HostsPath": "/var/lib/kubelet/pods/f690d17c-478d-4f58-bd3e-6249b33d902a/etc-hosts",
"LogPath": "/var/lib/docker/containers/eb0b3c97308c3f6d5fc44359ddaa37b53b0d8c2fd958c2798a0554ddbdccd760/eb0b3c97308c3f6d5fc44359ddaa37b53b0d8c2fd958c2798a0554ddbdccd760-json.log",
"Name": "/k8s_demo2_demo_nsvolume_f690d17c-478d-4f58-bd3e-6249b33d902a_0",
"RestartCount": 0,
"Driver": "overlay2",
"Platform": "linux",
"MountLabel": "",
"ProcessLabel": "",
"AppArmorProfile": "",
"ExecIDs": null,
"HostConfig": {
"Binds": [
"/var/lib/kubelet/pods/f690d17c-478d-4f58-bd3e-6249b33d902a/volumes/kubernetes.io~empty-dir/volume1:/xx",
"/var/lib/kubelet/pods/f690d17c-478d-4f58-bd3e-6249b33d902a/volumes/kubernetes.io~projected/kube-api-access-v5wg9:/var/run/secrets/kubernetes.io/serviceaccount:ro",
"/var/lib/kubelet/pods/f690d17c-478d-4f58-bd3e-6249b33d902a/etc-hosts:/etc/hosts",
"/var/lib/kubelet/pods/f690d17c-478d-4f58-bd3e-6249b33d902a/containers/demo2/d28c536b:/dev/termination-log"
],
"ContainerIDFile": "",
"LogConfig": {
"Type": "json-file",
"Config": {}
},
"NetworkMode": "container:358fa6a3bf58c602edf1da39ecf34881c419b660965f682f37c241acaf50ca4a",
"PortBindings": null,
"RestartPolicy": {
"Name": "no",
"MaximumRetryCount": 0
},
"AutoRemove": false,
"VolumeDriver": "",
"VolumesFrom": null,
"ConsoleSize": [
0,
0
],
"CapAdd": null,
"CapDrop": null,
"CgroupnsMode": "host",
"Dns": null,
"DnsOptions": null,
"DnsSearch": null,
"ExtraHosts": null,
"GroupAdd": null,
"IpcMode": "container:358fa6a3bf58c602edf1da39ecf34881c419b660965f682f37c241acaf50ca4a",
"Cgroup": "",
"Links": null,
"OomScoreAdj": 1000,
"PidMode": "",
"Privileged": false,
"PublishAllPorts": false,
"ReadonlyRootfs": false,
"SecurityOpt": [
"seccomp=unconfined"
],
"UTSMode": "",
"UsernsMode": "",
"ShmSize": 67108864,
"Runtime": "runc",
"Isolation": "",
"CpuShares": 2,
"Memory": 0,
"NanoCpus": 0,
"CgroupParent": "/kubepods/besteffort/podf690d17c-478d-4f58-bd3e-6249b33d902a",
"BlkioWeight": 0,
"BlkioWeightDevice": null,
"BlkioDeviceReadBps": null,
"BlkioDeviceWriteBps": null,
"BlkioDeviceReadIOps": null,
"BlkioDeviceWriteIOps": null,
"CpuPeriod": 100000,
"CpuQuota": 0,
"CpuRealtimePeriod": 0,
"CpuRealtimeRuntime": 0,
"CpusetCpus": "",
"CpusetMems": "",
"Devices": [],
"DeviceCgroupRules": null,
"DeviceRequests": null,
"MemoryReservation": 0,
"MemorySwap": 0,
"MemorySwappiness": null,
"OomKillDisable": false,
"PidsLimit": null,
"Ulimits": null,
"CpuCount": 0,
"CpuPercent": 0,
"IOMaximumIOps": 0,
"IOMaximumBandwidth": 0,
"MaskedPaths": [
"/proc/acpi",
"/proc/kcore",
"/proc/keys",
"/proc/latency_stats",
"/proc/timer_list",
"/proc/timer_stats",
"/proc/sched_debug",
"/proc/scsi",
"/sys/firmware"
],
"ReadonlyPaths": [
"/proc/asound",
"/proc/bus",
"/proc/fs",
"/proc/irq",
"/proc/sys",
"/proc/sysrq-trigger"
]
},
"GraphDriver": {
"Data": {
"LowerDir": "/var/lib/docker/overlay2/0f2e3d42b44b959c962e01990c93e92a333f2e101d9bfc5305b43f559e96e239-init/diff:/var/lib/docker/overlay2/e151f4c9750ff81b23bc4ee275c22f1664d4fc7974265b9ac8a8b440f0bc5e31/diff",
"MergedDir": "/var/lib/docker/overlay2/0f2e3d42b44b959c962e01990c93e92a333f2e101d9bfc5305b43f559e96e239/merged",
"UpperDir": "/var/lib/docker/overlay2/0f2e3d42b44b959c962e01990c93e92a333f2e101d9bfc5305b43f559e96e239/diff",
"WorkDir": "/var/lib/docker/overlay2/0f2e3d42b44b959c962e01990c93e92a333f2e101d9bfc5305b43f559e96e239/work"
},
"Name": "overlay2"
},
"Mounts": [
{
"Type": "bind",
"Source": "/var/lib/kubelet/pods/f690d17c-478d-4f58-bd3e-6249b33d902a/volumes/kubernetes.io~empty-dir/volume1",
"Destination": "/xx",
"Mode": "",
"RW": true,
"Propagation": "rprivate"
},
{
"Type": "bind",
"Source": "/var/lib/kubelet/pods/f690d17c-478d-4f58-bd3e-6249b33d902a/volumes/kubernetes.io~projected/kube-api-access-v5wg9",
"Destination": "/var/run/secrets/kubernetes.io/serviceaccount",
"Mode": "ro",
"RW": false,
"Propagation": "rprivate"
},
{
"Type": "bind",
"Source": "/var/lib/kubelet/pods/f690d17c-478d-4f58-bd3e-6249b33d902a/etc-hosts",
"Destination": "/etc/hosts",
"Mode": "",
"RW": true,
"Propagation": "rprivate"
},
{
"Type": "bind",
"Source": "/var/lib/kubelet/pods/f690d17c-478d-4f58-bd3e-6249b33d902a/containers/demo2/d28c536b",
"Destination": "/dev/termination-log",
"Mode": "",
"RW": true,
"Propagation": "rprivate"
}
],
"Config": {
"Hostname": "demo",
"Domainname": "",
"User": "0",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"KUBERNETES_SERVICE_PORT_HTTPS=443",
"KUBERNETES_PORT=tcp://10.96.0.1:443",
"KUBERNETES_PORT_443_TCP=tcp://10.96.0.1:443",
"KUBERNETES_PORT_443_TCP_PROTO=tcp",
"KUBERNETES_PORT_443_TCP_PORT=443",
"KUBERNETES_PORT_443_TCP_ADDR=10.96.0.1",
"KUBERNETES_SERVICE_HOST=10.96.0.1",
"KUBERNETES_SERVICE_PORT=443",
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
],
"Cmd": null,
"Healthcheck": {
"Test": [
"NONE"
]
},
"Image": "sha256:7cfbbec8963d8f13e6c70416d6592e1cc10f47a348131290a55d43c3acab3fb9",
"Volumes": null,
"WorkingDir": "",
"Entrypoint": [
"sh",
"-c",
"sleep 5000"
],
"OnBuild": null,
"Labels": {
"annotation.io.kubernetes.container.hash": "56690cd4",
"annotation.io.kubernetes.container.restartCount": "0",
"annotation.io.kubernetes.container.terminationMessagePath": "/dev/termination-log",
"annotation.io.kubernetes.container.terminationMessagePolicy": "File",
"annotation.io.kubernetes.pod.terminationGracePeriod": "30",
"io.kubernetes.container.logpath": "/var/log/pods/nsvolume_demo_f690d17c-478d-4f58-bd3e-6249b33d902a/demo2/0.log",
"io.kubernetes.container.name": "demo2",
"io.kubernetes.docker.type": "container",
"io.kubernetes.pod.name": "demo",
"io.kubernetes.pod.namespace": "nsvolume",
"io.kubernetes.pod.uid": "f690d17c-478d-4f58-bd3e-6249b33d902a",
"io.kubernetes.sandbox.id": "358fa6a3bf58c602edf1da39ecf34881c419b660965f682f37c241acaf50ca4a"
}
},
"NetworkSettings": {
"Bridge": "",
"SandboxID": "",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {},
"SandboxKey": "",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "",
"Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "",
"IPPrefixLen": 0,
"IPv6Gateway": "",
"MacAddress": "",
"Networks": {}
}
}
]
[root@vms12 ~]# docker inspect c27ff5aafcdf
[
{
"Id": "c27ff5aafcdfe8200f000738cbc34a817a3ab964dc25774757e5d24c28e24c6c",
"Created": "2023-05-30T05:36:01.483534386Z",
"Path": "sh",
"Args": [
"-c",
"sleep 5000"
],
"State": {
"Status": "running",
"Running": true,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"Dead": false,
"Pid": 66732,
"ExitCode": 0,
"Error": "",
"StartedAt": "2023-05-30T05:36:01.586033581Z",
"FinishedAt": "0001-01-01T00:00:00Z"
},
"Image": "sha256:7cfbbec8963d8f13e6c70416d6592e1cc10f47a348131290a55d43c3acab3fb9",
"ResolvConfPath": "/var/lib/docker/containers/358fa6a3bf58c602edf1da39ecf34881c419b660965f682f37c241acaf50ca4a/resolv.conf",
"HostnamePath": "/var/lib/docker/containers/358fa6a3bf58c602edf1da39ecf34881c419b660965f682f37c241acaf50ca4a/hostname",
"HostsPath": "/var/lib/kubelet/pods/f690d17c-478d-4f58-bd3e-6249b33d902a/etc-hosts",
"LogPath": "/var/lib/docker/containers/c27ff5aafcdfe8200f000738cbc34a817a3ab964dc25774757e5d24c28e24c6c/c27ff5aafcdfe8200f000738cbc34a817a3ab964dc25774757e5d24c28e24c6c-json.log",
"Name": "/k8s_demo1_demo_nsvolume_f690d17c-478d-4f58-bd3e-6249b33d902a_0",
"RestartCount": 0,
"Driver": "overlay2",
"Platform": "linux",
"MountLabel": "",
"ProcessLabel": "",
"AppArmorProfile": "",
"ExecIDs": null,
"HostConfig": {
"Binds": [
"/var/lib/kubelet/pods/f690d17c-478d-4f58-bd3e-6249b33d902a/volumes/kubernetes.io~empty-dir/volume1:/xx",
"/var/lib/kubelet/pods/f690d17c-478d-4f58-bd3e-6249b33d902a/volumes/kubernetes.io~projected/kube-api-access-v5wg9:/var/run/secrets/kubernetes.io/serviceaccount:ro",
"/var/lib/kubelet/pods/f690d17c-478d-4f58-bd3e-6249b33d902a/etc-hosts:/etc/hosts",
"/var/lib/kubelet/pods/f690d17c-478d-4f58-bd3e-6249b33d902a/containers/demo1/6766f47e:/dev/termination-log"
],
"ContainerIDFile": "",
"LogConfig": {
"Type": "json-file",
"Config": {}
},
"NetworkMode": "container:358fa6a3bf58c602edf1da39ecf34881c419b660965f682f37c241acaf50ca4a",
"PortBindings": null,
"RestartPolicy": {
"Name": "no",
"MaximumRetryCount": 0
},
"AutoRemove": false,
"VolumeDriver": "",
"VolumesFrom": null,
"ConsoleSize": [
0,
0
],
"CapAdd": null,
"CapDrop": null,
"CgroupnsMode": "host",
"Dns": null,
"DnsOptions": null,
"DnsSearch": null,
"ExtraHosts": null,
"GroupAdd": null,
"IpcMode": "container:358fa6a3bf58c602edf1da39ecf34881c419b660965f682f37c241acaf50ca4a",
"Cgroup": "",
"Links": null,
"OomScoreAdj": 1000,
"PidMode": "",
"Privileged": false,
"PublishAllPorts": false,
"ReadonlyRootfs": false,
"SecurityOpt": [
"seccomp=unconfined"
],
"UTSMode": "",
"UsernsMode": "",
"ShmSize": 67108864,
"Runtime": "runc",
"Isolation": "",
"CpuShares": 2,
"Memory": 0,
"NanoCpus": 0,
"CgroupParent": "/kubepods/besteffort/podf690d17c-478d-4f58-bd3e-6249b33d902a",
"BlkioWeight": 0,
"BlkioWeightDevice": null,
"BlkioDeviceReadBps": null,
"BlkioDeviceWriteBps": null,
"BlkioDeviceReadIOps": null,
"BlkioDeviceWriteIOps": null,
"CpuPeriod": 100000,
"CpuQuota": 0,
"CpuRealtimePeriod": 0,
"CpuRealtimeRuntime": 0,
"CpusetCpus": "",
"CpusetMems": "",
"Devices": [],
"DeviceCgroupRules": null,
"DeviceRequests": null,
"MemoryReservation": 0,
"MemorySwap": 0,
"MemorySwappiness": null,
"OomKillDisable": false,
"PidsLimit": null,
"Ulimits": null,
"CpuCount": 0,
"CpuPercent": 0,
"IOMaximumIOps": 0,
"IOMaximumBandwidth": 0,
"MaskedPaths": [
"/proc/acpi",
"/proc/kcore",
"/proc/keys",
"/proc/latency_stats",
"/proc/timer_list",
"/proc/timer_stats",
"/proc/sched_debug",
"/proc/scsi",
"/sys/firmware"
],
"ReadonlyPaths": [
"/proc/asound",
"/proc/bus",
"/proc/fs",
"/proc/irq",
"/proc/sys",
"/proc/sysrq-trigger"
]
},
"GraphDriver": {
"Data": {
"LowerDir": "/var/lib/docker/overlay2/7cb2130d3bb712dc53ce9e4262c86772bdaa710ffc965125b482a33d62b4be20-init/diff:/var/lib/docker/overlay2/e151f4c9750ff81b23bc4ee275c22f1664d4fc7974265b9ac8a8b440f0bc5e31/diff",
"MergedDir": "/var/lib/docker/overlay2/7cb2130d3bb712dc53ce9e4262c86772bdaa710ffc965125b482a33d62b4be20/merged",
"UpperDir": "/var/lib/docker/overlay2/7cb2130d3bb712dc53ce9e4262c86772bdaa710ffc965125b482a33d62b4be20/diff",
"WorkDir": "/var/lib/docker/overlay2/7cb2130d3bb712dc53ce9e4262c86772bdaa710ffc965125b482a33d62b4be20/work"
},
"Name": "overlay2"
},
"Mounts": [
{
"Type": "bind",
"Source": "/var/lib/kubelet/pods/f690d17c-478d-4f58-bd3e-6249b33d902a/volumes/kubernetes.io~empty-dir/volume1",
"Destination": "/xx",
"Mode": "",
"RW": true,
"Propagation": "rprivate"
},
{
"Type": "bind",
"Source": "/var/lib/kubelet/pods/f690d17c-478d-4f58-bd3e-6249b33d902a/volumes/kubernetes.io~projected/kube-api-access-v5wg9",
"Destination": "/var/run/secrets/kubernetes.io/serviceaccount",
"Mode": "ro",
"RW": false,
"Propagation": "rprivate"
},
{
"Type": "bind",
"Source": "/var/lib/kubelet/pods/f690d17c-478d-4f58-bd3e-6249b33d902a/etc-hosts",
"Destination": "/etc/hosts",
"Mode": "",
"RW": true,
"Propagation": "rprivate"
},
{
"Type": "bind",
"Source": "/var/lib/kubelet/pods/f690d17c-478d-4f58-bd3e-6249b33d902a/containers/demo1/6766f47e",
"Destination": "/dev/termination-log",
"Mode": "",
"RW": true,
"Propagation": "rprivate"
}
],
"Config": {
"Hostname": "demo",
"Domainname": "",
"User": "0",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"KUBERNETES_PORT_443_TCP_PORT=443",
"KUBERNETES_PORT_443_TCP_ADDR=10.96.0.1",
"KUBERNETES_SERVICE_HOST=10.96.0.1",
"KUBERNETES_SERVICE_PORT=443",
"KUBERNETES_SERVICE_PORT_HTTPS=443",
"KUBERNETES_PORT=tcp://10.96.0.1:443",
"KUBERNETES_PORT_443_TCP=tcp://10.96.0.1:443",
"KUBERNETES_PORT_443_TCP_PROTO=tcp",
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
],
"Cmd": null,
"Healthcheck": {
"Test": [
"NONE"
]
},
"Image": "sha256:7cfbbec8963d8f13e6c70416d6592e1cc10f47a348131290a55d43c3acab3fb9",
"Volumes": null,
"WorkingDir": "",
"Entrypoint": [
"sh",
"-c",
"sleep 5000"
],
"OnBuild": null,
"Labels": {
"annotation.io.kubernetes.container.hash": "60b2be1e",
"annotation.io.kubernetes.container.restartCount": "0",
"annotation.io.kubernetes.container.terminationMessagePath": "/dev/termination-log",
"annotation.io.kubernetes.container.terminationMessagePolicy": "File",
"annotation.io.kubernetes.pod.terminationGracePeriod": "30",
"io.kubernetes.container.logpath": "/var/log/pods/nsvolume_demo_f690d17c-478d-4f58-bd3e-6249b33d902a/demo1/0.log",
"io.kubernetes.container.name": "demo1",
"io.kubernetes.docker.type": "container",
"io.kubernetes.pod.name": "demo",
"io.kubernetes.pod.namespace": "nsvolume",
"io.kubernetes.pod.uid": "f690d17c-478d-4f58-bd3e-6249b33d902a",
"io.kubernetes.sandbox.id": "358fa6a3bf58c602edf1da39ecf34881c419b660965f682f37c241acaf50ca4a"
}
},
"NetworkSettings": {
"Bridge": "",
"SandboxID": "",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {},
"SandboxKey": "",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "",
"Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "",
"IPPrefixLen": 0,
"IPv6Gateway": "",
"MacAddress": "",
"Networks": {}
}
}
]
[root@vms12 ~]# 可以看到两个容器里都有/xx，且都对应到同一个物理目录/var/lib/kubelet/pods/7549132-ae81-11e9-8865-000c294d4f7c/volumes/kubernetes.io~empty-dir/volume1里。
步骤9：在master上随便拷贝一个文件到这个pod里容器demo1的/xx目录。
##########实操验证##########
[root@vms10 volume]# kubectl cp /etc/hosts demo:/xx -c demo1
[root@vms10 volume]# 步骤10：查看demo这个pod里容器demo2的/xx目录。
##########实操验证##########
[root@vms10 volume]# kubectl exec demo -c demo2 -- ls /xx
hosts
[root@vms10 volume]# 可以看到这里也有数据，因为demo1和demo2都挂载的同一个卷，实现了数据的共享。
步骤11：切换到vms12。
##########实操验证##########
[root@vms12 ~]# ls /var/lib/kubelet/pods/f690d17c-478d-4f58-bd3e-6249b33d902a/volumes/kubernetes.io~empty-dir/volume1
hosts
[root@vms12 ~]# 可以看到有hosts文件。
步骤12：删除此pod。