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.
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[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
df -hT /mnt Filesystem Type Size Used Avail Use% Mounted on /dev/mapper/ubuntu--vg-ubuntu--lv ext4 77G 6.8G 66G 10% /mntroot@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
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@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
podman volume rm volume01 volume01 |
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