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External containers are containers created outside of Podman. For example Buildah and CRI-O Containers. $ buildah from alpine alpine-working-container $ buildah run alpine-working-container touch /test $ podman container exists --external alpine-working-container $ podman container diff alpine-working-container C /etc A /test Added --external flag to refer to external containers, rather then --storage. Added --external for podman container exists and modified podman ps to use --external rather then --storage. It was felt that --storage would confuse the user into thinking about changing the storage driver or options. --storage is still supported through the use of aliases. Finally podman contianer diff, does not require the --external flag, since it there is little change of users making the mistake, and would just be a pain for the user to remember the flag. podman container exists --external is required because it could fool scripts that rely on the existance of a Podman container, and there is a potential for a partial deletion of a container, which could mess up existing users. Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
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% podman-container-exists(1)
NAME
podman-container-exists - Check if a container exists in local storage
SYNOPSIS
podman container exists [options] container
DESCRIPTION
podman container exists checks if a container exists in local storage. The ID or Name
of the container may be used as input. Podman will return an exit code
of 0 when the container is found. A 1 will be returned otherwise. An exit code of 125 indicates there
was an issue accessing the local storage.
OPTIONS
--external=true|false Check for external containers as well as Podman containers. These external containers are generally created via other container technology such as Buildah or CRI-O.
-h, --help Print usage statement
Examples
Check if an container called webclient exists in local storage (the container does actually exist).
$ podman container exists webclient
$ echo $?
0
Check if an container called webbackend exists in local storage (the container does not actually exist).
$ podman container exists webbackend
$ echo $?
1
Check if an container called ubi8-working-container created via Buildah exists in local storage (the container does not actually exist).
$ podman container exists --external ubi8-working-container
$ echo $?
1
SEE ALSO
podman(1)
HISTORY
November 2018, Originally compiled by Brent Baude (bbaude at redhat dot com)