Podman : Use External Storage2022/05/24 |
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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 fedora /bin/bash
df -hT /mnt Filesystem Type Size Used Avail Use% Mounted on /dev/mapper/fedora_fedora-root xfs 78G 3.4G 75G 5% /mnt[root@711b74cff117 /]# 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": "2022-05-24T10:21:52.40654283+09:00",
"Labels": {},
"Scope": "local",
"Options": {},
"MountCount": 0,
"NeedsCopyUp": true,
"NeedsChown": true
}
]
# run a container with mounting [volume01] to [/mnt] on container [root@dlp ~]# podman run -it -v volume01:/mnt fedora
df -hT /mnt Filesystem Type Size Used Avail Use% Mounted on /dev/mapper/fedora_fedora-root xfs 78G 3.4G 75G 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 fedora /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): 6655b4f7a00d34ec56141b48528e0fe0218b04749a657737cc397b3ffa0040f6, caef8f681a78239e0f3933288eb95b2158d7cd5bce8698b1dc6eac938914f053: 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 6655b4f7a00d34ec56141b48528e0fe0218b04749a657737cc397b3ffa0040f6 [root@dlp ~]# podman rm caef8f681a78239e0f3933288eb95b2158d7cd5bce8698b1dc6eac938914f053
podman volume rm volume01 volume01 |
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