Podman : Use External Storage2024/05/05

	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.
[1]	It's possible to mount a directory on Docker Host into Containers.

# 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]

root@dlp:~#

podman run -it -v /var/lib/containers/disk01:/mnt ubuntu /bin/bash

root@1780910fd492:/#

df -hT /mnt

Filesystem                        Type  Size  Used Avail Use% Mounted on
/dev/mapper/ubuntu--vg-ubuntu--lv ext4   77G  6.8G   66G  10% /mnt

root@1780910fd492:/#

cat /mnt/testfile.txt

persistent storage

[2]	It's also possible to configure external storage by Podman Data Volume command.

# 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": "2024-05-05T02:20:56.563223079Z",
          "Labels": {},
          "Scope": "local",
          "Options": {},
          "MountCount": 0,
          "NeedsCopyUp": true,
          "NeedsChown": true,
          "LockNumber": 15
     }
]

# run a container with mounting [volume01] to [/mnt] on container

root@dlp:~#

podman run -it -v volume01:/mnt ubuntu

root@9406eb98a4ef:/#

df -hT /mnt

Filesystem                        Type  Size  Used Avail Use% Mounted on
/dev/mapper/ubuntu--vg-ubuntu--lv ext4   77G  6.9G   66G  10% /mnt

root@9406eb98a4ef:/#

echo "Podman Volume test" > /mnt/testfile.txt

root@9406eb98a4ef:/#

exit

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 ubuntu 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): 9406eb98a4ef7c385b6af48a30e7e7d0b6a357b242528356dd8a037710baa829, d515f2ee6653532dde52ec10080b4b93f5b78614cff6abbf1a3aa623d365f480: 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 9406eb98a4ef7c385b6af48a30e7e7d0b6a357b242528356dd8a037710baa829

root@dlp:~#

podman rm d515f2ee6653532dde52ec10080b4b93f5b78614cff6abbf1a3aa623d365f480

root@dlp:~#

podman volume rm volume01

volume01

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