Podman : Use External Storage2024/02/29 |
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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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root@dlp:~ # podman images REPOSITORY TAG IMAGE ID CREATED SIZE localhost/freebsd-nginx latest a0a053cc78a3 16 hours ago 1.17 GB localhost/freebsd-httpd latest add46dedb2b7 22 hours ago 1.44 GB localhost/freebsd-base latest 2527bfa5eeb4 42 hours ago 1.05 GB quay.io/centos/centos stream9 ce3ac91d4020 2 weeks ago 161 MB docker.io/library/ubuntu latest 3db8720ecbf5 2 weeks ago 80.4 MB # 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 freebsd-base /bin/sh
df -hT /mnt Filesystem Type Size Used Avail Capacity Mounted on /var/lib/containers/disk01 nullfs 73G 1.6G 71G 2% /mnt# 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/db/containers/storage/volumes/volume01/_data",
"CreatedAt": "2024-02-29T08:44:43.156912115+09:00",
"Labels": {},
"Scope": "local",
"Options": {},
"MountCount": 0,
"NeedsCopyUp": true,
"NeedsChown": true,
"LockNumber": 46
}
]
# run a container with mounting [volume01] to [/mnt] on container root@dlp:~ # podman run -it -v volume01:/mnt freebsd-base /bin/sh
df -hT /mnt Filesystem Type Size Used Avail Capacity Mounted on /var/db/containers/storage/volumes/volume01/_data nullfs 73G 1.6G 71G 2% /mnt
#
echo "Podman Volume test" > /mnt/testfile.txt # exit
root@dlp:~ #
cat /var/db/containers/storage/volumes/volume01/_data/testfile.txt Podman Volume test # possible to mount from other containers root@dlp:~ # podman run -v volume01:/var/volume01 freebsd-base /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): 8b37e1975fe87beefc378c4e24c185dc849604e7defebb658976b9185212d19d, e026dd578bf559d6a9ec3e00c93cb113da5d427ea72f619c7f29ce7fccfe2f0f: 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 8b37e1975fe87beefc378c4e24c185dc849604e7defebb658976b9185212d19d root@dlp:~ # podman rm e026dd578bf559d6a9ec3e00c93cb113da5d427ea72f619c7f29ce7fccfe2f0f
podman volume rm volume01 volume01 |
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