Podman : Use External Storage2021/07/29 |
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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 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 rockylinux /bin/bash
df -hT /mnt Filesystem Type Size Used Avail Use% Mounted on /dev/mapper/rl-root xfs 71G 3.1G 68G 5% /mnt[root@49e10e8ab0c1 /]# 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": "2021-07-29T13:58:14.187953142+09:00",
"Labels": {},
"Scope": "local",
"Options": {}
}
]
# run a container with mounting [volume01] to [/mnt] on container [root@dlp ~]# podman run -it -v volume01:/mnt rockylinux
df -hT /mnt Filesystem Type Size Used Avail Use% Mounted on /dev/mapper/rl-root xfs 71G 3.1G 68G 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 rockylinux /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): 5588e466d23ccf0102034fa407bb14a4120767b15f210bac3e1efda7d7bca8de, ca52903492955b1adf29243609875529c375d2dd6f7d1bbea947895ba5562d75: 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 5588e466d23ccf0102034fa407bb14a4120767b15f210bac3e1efda7d7bca8de [root@dlp ~]# podman rm ca52903492955b1adf29243609875529c375d2dd6f7d1bbea947895ba5562d75
podman volume rm volume01 volume01 |
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