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Diffstat (limited to 'docs/source/markdown/podman-run.1.md.in')
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1 files changed, 2 insertions, 172 deletions
diff --git a/docs/source/markdown/podman-run.1.md.in b/docs/source/markdown/podman-run.1.md.in index 86066ad9c..493a7494a 100644 --- a/docs/source/markdown/podman-run.1.md.in +++ b/docs/source/markdown/podman-run.1.md.in @@ -584,179 +584,9 @@ When a user namespace is not in use, the UID and GID used within the container a #### **--variant**=*VARIANT* Use _VARIANT_ instead of the default architecture variant of the container image. Some images can use multiple variants of the arm architectures, such as arm/v5 and arm/v7. -#### **--volume**, **-v**=*[[SOURCE-VOLUME|HOST-DIR:]CONTAINER-DIR[:OPTIONS]]* +@@option volume -Create a bind mount. If you specify _/HOST-DIR_:_/CONTAINER-DIR_, Podman -bind mounts _host-dir_ in the host to _CONTAINER-DIR_ in the Podman -container. Similarly, _SOURCE-VOLUME_:_/CONTAINER-DIR_ will mount the volume -in the host to the container. If no such named volume exists, Podman will -create one. (Note when using the remote client, including Mac and Windows (excluding WSL2) machines, the volumes will be mounted from the remote server, not necessarily the client machine.) - -The _options_ is a comma-separated list and can be: <sup>[[1]](#Footnote1)</sup> - -* **rw**|**ro** -* **z**|**Z** -* [**O**] -* [**U**] -* [**no**]**copy** -* [**no**]**dev** -* [**no**]**exec** -* [**no**]**suid** -* [**r**]**bind** -* [**r**]**shared**|[**r**]**slave**|[**r**]**private**[**r**]**unbindable** - -The `CONTAINER-DIR` must be an absolute path such as `/src/docs`. The volume -will be mounted into the container at this directory. - -Volumes may specify a source as well, as either a directory on the host -or the name of a named volume. If no source is given, the volume will be created as an -anonymously named volume with a randomly generated name, and will be removed when -the container is removed via the `--rm` flag or `podman rm --volumes`. - -If a volume source is specified, it must be a path on the host or the name of a -named volume. Host paths are allowed to be absolute or relative; relative paths -are resolved relative to the directory Podman is run in. If the source does not -exist, Podman will return an error. Users must pre-create the source files or -directories. - -Any source that does not begin with a `.` or `/` will be treated as the name of -a named volume. If a volume with that name does not exist, it will be created. -Volumes created with names are not anonymous, and they are not removed by the `--rm` -option and the `podman rm --volumes` command. - -You can specify multiple **-v** options to mount one or more volumes into a -container. - - `Write Protected Volume Mounts` - -You can add **:ro** or **:rw** option to mount a volume in read-only or -read-write mode, respectively. By default, the volumes are mounted read-write. - - `Chowning Volume Mounts` - -By default, Podman does not change the owner and group of source volume -directories mounted into containers. If a container is created in a new user -namespace, the UID and GID in the container may correspond to another UID and -GID on the host. - -The `:U` suffix tells Podman to use the correct host UID and GID based on the -UID and GID within the container, to change recursively the owner and group of -the source volume. - -**Warning** use with caution since this will modify the host filesystem. - - `Labeling Volume Mounts` - -Labeling systems like SELinux require that proper labels are placed on volume -content mounted into a container. Without a label, the security system might -prevent the processes running inside the container from using the content. By -default, Podman does not change the labels set by the OS. - -To change a label in the container context, you can add either of two suffixes -**:z** or **:Z** to the volume mount. These suffixes tell Podman to relabel file -objects on the shared volumes. The **z** option tells Podman that two containers -share the volume content. As a result, Podman labels the content with a shared -content label. Shared volume labels allow all containers to read/write content. -The **Z** option tells Podman to label the content with a private unshared label. - -Note: Do not relabel system files and directories. Relabeling system content -might cause other confined services on your machine to fail. For these types -of containers we recommend disabling SELinux separation. The option -`--security-opt label=disable` disables SELinux separation for the container. -For example if a user wanted to volume mount their entire home directory into a -container, they need to disable SELinux separation. - - $ podman run --security-opt label=disable -v $HOME:/home/user fedora touch /home/user/file - - `Overlay Volume Mounts` - - The `:O` flag tells Podman to mount the directory from the host as a -temporary storage using the `overlay file system`. The container processes -can modify content within the mountpoint which is stored in the -container storage in a separate directory. In overlay terms, the source -directory will be the lower, and the container storage directory will be the -upper. Modifications to the mount point are destroyed when the container -finishes executing, similar to a tmpfs mount point being unmounted. - - For advanced users overlay option also supports custom non-volatile `upperdir` and `workdir` -for the overlay mount. Custom `upperdir` and `workdir` can be fully managed by the users themselves -and `podman` will not remove it on lifecycle completion. Example `:O,upperdir=/some/upper,workdir=/some/work` - - Subsequent executions of the container will see the original source directory -content, any changes from previous container executions no longer exist. - - One use case of the overlay mount is sharing the package cache from the -host into the container to allow speeding up builds. - - Note: - - - The `O` flag conflicts with other options listed above. -Content mounted into the container is labeled with the private label. - On SELinux systems, labels in the source directory must be readable -by the container label. Usually containers can read/execute `container_share_t` -and can read/write `container_file_t`. If you cannot change the labels on a -source volume, SELinux container separation must be disabled for the container -to work. - - The source directory mounted into the container with an overlay mount -should not be modified, it can cause unexpected failures. It is recommended -that you do not modify the directory until the container finishes running. - -Only the current container can use a private volume. - - `Mounts propagation` - -By default bind mounted volumes are `private`. That means any mounts done -inside container will not be visible on host and vice versa. One can change -this behavior by specifying a volume mount propagation property. Making a -volume shared mounts done under that volume inside container will be -visible on host and vice versa. Making a volume **slave** enables only one -way mount propagation and that is mounts done on host under that volume -will be visible inside container but not the other way around. <sup>[[1]](#Footnote1)</sup> - -To control mount propagation property of a volume one can use the [**r**]**shared**, -[**r**]**slave**, [**r**]**private** or the [**r**]**unbindable** propagation flag. -For mount propagation to work the source mount point (the mount point where source dir -is mounted on) has to have the right propagation properties. For shared volumes, the -source mount point has to be shared. And for slave volumes, the source mount point -has to be either shared or slave. <sup>[[1]](#Footnote1)</sup> - -If you want to recursively mount a volume and all of its submounts into a -container, then you can use the **rbind** option. By default the bind option is -used, and submounts of the source directory will not be mounted into the -container. - -Mounting the volume with the **nosuid** options means that SUID applications on -the volume will not be able to change their privilege. By default volumes -are mounted with **nosuid**. - -Mounting the volume with the **noexec** option means that no executables on the -volume will be able to be executed within the container. - -Mounting the volume with the **nodev** option means that no devices on the volume -will be able to be used by processes within the container. By default volumes -are mounted with **nodev**. - -If the _host-dir_ is a mount point, then **dev**, **suid**, and **exec** options are -ignored by the kernel. - -Use **df $hostdir** to figure out the source mount, and then use -**findmnt -o TARGET,PROPAGATION _source-mount-dir_** to figure out propagation -properties of source mount. If **findmnt**(1) utility is not available, then one -can look at mount entry for source mount point in _/proc/self/mountinfo_. Look -at the "optional fields" and see if any propagation properties are specified. -In there, **shared:N** means the mount is shared, **master:N** means mount -is slave, and if nothing is there, the mount is private. <sup>[[1]](#Footnote1)</sup> - -To change propagation properties of a mount point, use **mount**(8) command. For -example, if one wants to bind mount source directory _/foo_, one can do -**mount --bind /foo /foo** and **mount --make-private --make-shared /foo**. This -will convert /foo into a shared mount point. Alternatively, one can directly -change propagation properties of source mount. Say, if _/_ is source mount for -_/foo_, then use **mount --make-shared /** to convert _/_ into a shared mount. - -Note: if the user only has access rights via a group, accessing the volume -from inside a rootless container will fail. Use the `--group-add keep-groups` -flag to pass the user's supplementary group access into the container. +Use the **--group-add keep-groups** option to pass the user's supplementary group access into the container. #### **--volumes-from**=*CONTAINER[:OPTIONS]* |