Podman : Use External Storage2024/05/03 |
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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.
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| [1] | It's possible to mount a directory on Podman 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-root xfs 78G 3.9G 75G 5% /mnt[root@27d1acb64b11 /]# cat /mnt/testfile.txt persistent storage |
| [2] | It's also possible to configure external storage by Podman 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": "2024-05-03T15:49:54.689374127+09:00",
"Labels": {},
"Scope": "local",
"Options": {},
"MountCount": 0,
"NeedsCopyUp": true,
"NeedsChown": true,
"LockNumber": 8
}
]
# 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-root xfs 78G 3.9G 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): 65acfb30285667272ab73109cb7fa9b78076c7048852e14282737dcf5debce40, 3dac45d20b43ae4e352b508800fb0a53b43a125755eba07fe0460c48ff458518: 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 65acfb30285667272ab73109cb7fa9b78076c7048852e14282737dcf5debce40 [root@dlp ~]# podman rm 3dac45d20b43ae4e352b508800fb0a53b43a125755eba07fe0460c48ff458518
podman volume rm volume01 volume01 |
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