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106 lines
3.7 KiB
106 lines
3.7 KiB
% containers-auth.json 5
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# NAME
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containers-auth.json - syntax for the registry authentication file
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# DESCRIPTION
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A file in JSON format controlling authentication against container image registries.
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The primary (read/write) file is stored at `${XDG_RUNTIME_DIR}/containers/auth.json` on Linux;
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on Windows and macOS, at `$HOME/.config/containers/auth.json`.
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When searching for the credential for a registry, the following files will be read in sequence until the valid credential is found:
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first reading the primary (read/write) file, or the explicit override using an option of the calling application.
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If credentials are not present there,
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the search continues in `${XDG_CONFIG_HOME}/containers/auth.json` (usually `~/.config/containers/auth.json`), `$HOME/.docker/config.json`, `$HOME/.dockercfg`.
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Except for the primary (read/write) file, other files are read-only unless the user, using an option of the calling application, explicitly points at it as an override.
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## FORMAT
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The auth.json file stores, or references, credentials that allow the user to authenticate
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to container image registries.
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It is primarily managed by a `login` command from a container tool such as `podman login`,
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`buildah login`, or `skopeo login`.
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Each entry contains a single hostname (e.g., `docker.io`) or a namespace (e.g., `quay.io/user/image`) as a key,
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and credentials in the form of a base64-encoded string as value of `auth`. The
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base64-encoded string contains a concatenation of the username, a colon, and the
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password.
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When checking for available credentials, the relevant repository is matched
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against available keys in its hierarchical order, going from most-specific to least-specific.
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For example, an image pull for `my-registry.local/namespace/user/image:latest` will
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result in a lookup in `auth.json` in the following order:
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- `my-registry.local/namespace/user/image`
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- `my-registry.local/namespace/user`
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- `my-registry.local/namespace`
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- `my-registry.local`
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This way it is possible to setup multiple credentials for a single registry
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which can be distinguished by their path.
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The following example shows the values found in auth.json after the user logged in to
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their accounts on quay.io and docker.io:
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```
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{
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"auths": {
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"docker.io": {
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"auth": "erfi7sYi89234xJUqaqxgmzcnQ2rRFWM5aJX0EC="
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},
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"quay.io": {
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"auth": "juQAqGmz5eR1ipzx8Evn6KGdw8fEa1w5MWczmgY="
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}
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}
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}
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```
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This example demonstrates how to use multiple paths for a single registry, while
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preserving a fallback for `my-registry.local`:
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```
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{
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"auths": {
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"my-registry.local/foo/bar/image": {
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"auth": "…"
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},
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"my-registry.local/foo": {
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"auth": "…"
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},
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"my-registry.local": {
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"auth": "…"
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},
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}
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}
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```
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An entry can be removed by using a `logout` command from a container
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tool such as `podman logout` or `buildah logout`.
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In addition, credential helpers can be configured for specific registries, and the credentials-helper
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software can be used to manage the credentials more securely than storing only base64-encoded credentials in `auth.json`.
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When the credential helper is in use on a Linux platform, the auth.json file would contain keys that specify the registry domain, and values that specify the suffix of the program to use (i.e. everything after docker-credential-). For example:
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```
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{
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"auths": {
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"localhost:5001": {}
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},
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"credHelpers": {
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"registry.example.com": "secretservice"
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}
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}
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```
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For more information on credential helpers, please reference the [GitHub docker-credential-helpers project](https://github.com/docker/docker-credential-helpers/releases).
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# SEE ALSO
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buildah-login(1), buildah-logout(1), podman-login(1), podman-logout(1), skopeo-login(1), skopeo-logout(1)
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# HISTORY
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Feb 2020, Originally compiled by Tom Sweeney <tsweeney@redhat.com>
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