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Podman : Use External Storage
2019/10/11 |
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When a Container is removed, data in it are also lost, so it's necessary to use external storage on Containers
if you'd like to save your data on Containers.
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| [1] | It's possible to mount a directory on Docker Host into Containers. |
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# create a directory for containers data [root@dlp ~]# mkdir /var/lib/containers/disk01 [root@dlp ~]# echo "persistent storage" >> /var/lib/containers/disk01/testfile.txt # run a Container with mounting the directory above on [/mnt] # if SELinux is [Enforcing], it needs to add [--privileged] option [root@dlp ~]# podman run --privileged -it -v /var/lib/containers/disk01:/mnt centos /bin/bash
df -hT /mnt Filesystem Type Size Used Avail Use% Mounted on /dev/mapper/cs-root xfs 71G 3.2G 68G 5% /mnt[root@43b1ee70639f /]# cat /mnt/testfile.txt persistent storage |
| [2] | It's also possible to configure external storage by Docker Data Volume command. |
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# create [volume01] volume [root@dlp ~]# podman volume create volume01 volume01 # display volume list [root@dlp ~]# podman volume ls DRIVER VOLUME NAME local volume01 # display details of [volume01] [root@dlp ~]# podman volume inspect volume01
[
{
"Name": "volume01",
"Driver": "local",
"Mountpoint": "/var/lib/containers/storage/volumes/volume01/_data",
"CreatedAt": "2021-03-17T20:46:26.011207388-06:00",
"Labels": {},
"Scope": "local",
"Options": {}
}
]
# run a container with mounting [volume01] to [/mnt] on container [root@dlp ~]# podman run -it -v volume01:/mnt centos
df -hT /mnt Filesystem Type Size Used Avail Use% Mounted on /dev/mapper/cs-root xfs 71G 3.2G 68G 5% /mnt
[root@dlp ~]#
cat /var/lib/containers/storage/volumes/volume01/_data/testfile.txt Podman Volume test # possible to mount from other containers [root@dlp ~]# podman run -v volume01:/var/volume01 centos /usr/bin/cat /var/volume01/testfile.txt Podman Volume test # to remove volumes, do like follows [root@dlp ~]# podman volume rm volume01 Error: volume volume01 is being used by the following container(s): 736c57cc37d8eb8b2f2b43065243758cfd08f32acae3966826c4131daaeaf439, dc43ed479137dc10deaf3e33f5478ec431d87b4afbd9f69bc7a9b94ccffb17b7: volume is being used # if some containers are using the volume you'd like to remove like above, # it needs to remove target containers before removing a volume [root@dlp ~]# podman rm 736c57cc37d8eb8b2f2b43065243758cfd08f32acae3966826c4131daaeaf439 [root@dlp ~]# podman rm dc43ed479137dc10deaf3e33f5478ec431d87b4afbd9f69bc7a9b94ccffb17b7
podman volume rm volume01 volume01 |