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podman-system-service(1) General Commands Manual podman-system-service(1) NAME podman-system-service - Run an API service SYNOPSIS podman system service [options] DESCRIPTION The podman system service command creates a listening service that an- swers API calls for Podman. The command is available on Linux systems and is usually executed in systemd services. The command is not avail- able when the Podman command is executed directly on a Windows or macOS host or in other situations where the Podman command is accessing a re- mote Podman API service. The REST API provided by podman system service is split into two parts: a compatibility layer offering support for the Docker v1.40 API, and a Podman-native Libpod layer. Documentation for the latter is available at https://docs.podman.io/en/latest/_static/api.html. Both APIs are versioned, but the server does not reject requests with an unsupported version set. Run the command in a systemd service The command podman system service supports systemd socket activation. When the command is run in a systemd service, the API service can therefore be provided on demand. If the systemd service is not already running, it will be activated as soon as a client connects to the lis- tening socket. Systemd then executes the podman system service command. After some time of inactivity, as defined by the --time option, the command terminates. Systemd sets the podman.service state as inactive. At this point there is no podman system service process running. No un- necessary compute resources are wasted. As soon as another client con- nects, systemd activates the systemd service again. The systemd unit files that declares the Podman API service for users are • /usr/lib/systemd/user/podman.service • /usr/lib/systemd/user/podman.socket In the file podman.socket the path of the listening Unix socket is de- fined by ListenStream=%t/podman/podman.sock The path contains the systemd specifier %t which systemd expands to the value of the environment variable XDG_RUNTIME_DIR (see systemd speci- fiers in the systemd.unit(5) man page). In addition to the systemd user services, there is also a systemd sys- tem service podman.service. It runs rootful Podman and is accessed from the Unix socket /run/podman/podman.sock. See the systemd unit files • /usr/lib/systemd/system/podman.service • /usr/lib/systemd/system/podman.socket The podman system service command does not support more than one lis- tening socket for the API service. Note: The default systemd unit files (system and user) change the log- level option to info from error. This change provides additional infor- mation on each API call. Run the command directly To support running an API service without using a systemd service, the command also takes an optional endpoint argument for the API in URI form. For example, unix:///tmp/foobar.sock or tcp://localhost:8080. If no endpoint is provided, defaults is used. The default endpoint for a rootful service is unix:///run/podman/podman.sock and rootless is unix://$XDG_RUNTIME_DIR/podman/podman.sock (for example unix:///run/user/1000/podman/podman.sock) Access the Unix socket from inside a container To access the API service inside a container: - mount the socket as a volume - run the container with --security-opt label=disable Security Please note that the API grants full access to all Podman functional- ity, and thus allows arbitrary code execution as the user running the API, with no ability to limit or audit this access. The API's security model is built upon access via a Unix socket with access restricted via standard file permissions, ensuring that only the user running the ser- vice will be able to access it. TLS can be used to secure this socket by requiring clients to present a certificate signed by a trusted cer- tificate authority ("CA"), as well as to allow the client to verify the identity of the API. We strongly recommend against making the API socket available via the network (IE, bindings the service to a tcp URL) without enabling mutual TLS to authenticate the client. Even ac- cess via Localhost carries risks - anyone with access to the system will be able to access the API. If remote access is required, we in- stead recommend forwarding the API socket via SSH, and limiting access on the remote machine to the greatest extent possible. If a tcp URL must be used without TLS, using the --cors option is recommended to im- prove security. OPTIONS --cors CORS headers to inject to the HTTP response. The default value is empty string which disables CORS headers. --help, -h Print usage statement. --time, -t The time until the session expires in seconds. The default is 5 sec- onds. A value of 0 means no timeout, therefore the session does not ex- pire. --tls-cert=path Path to a PEM file containing the TLS certificate to present to clients. --tls-key must also be provided. --tls-client-ca=path Path to a PEM file containing the TLS certificate bundle to validate client connections against. Connections that present no certificate or a certificate not signed by one of these certificates will be rejected. --tls-key=path Path to a PEM file containing the private key matching --tls-cert. --tls-cert must also be provided. The default timeout can be changed via the service_timeout=VALUE field in containers.conf. See containers.conf(5) for more information. EXAMPLES Start the user systemd socket for a rootless service. systemctl --user start podman.socket Configure DOCKER_HOST environment variable to point to the Podman socket so that it can be used via Docker API tools like docker-compose. $ export DOCKER_HOST=unix://$XDG_RUNTIME_DIR/podman/podman.sock $ docker-compose up Configure the systemd socket to be automatically started after reboots, and run as the specified user. systemctl --user enable podman.socket loginctl enable-linger <USER> Start the systemd socket for the rootful service. sudo systemctl start podman.socket Configure the socket to be automatically started after reboots. sudo systemctl enable podman.socket It is possible to run the API without using systemd socket activation. In this case the API will not be available on demand because the com- mand will stay terminated after the inactivity timeout has passed. Run an API with an inactivity timeout of 5 seconds without using socket ac- tivation. podman system service --time 5 The default socket was used as no URI argument was provided. Run an API service with a custom socket path and no timeout: podman system service --time 0 unix:///var/run/mypodman.sock This starts the API service listening on the custom socket /var/run/my- podman.sock with no inactivity timeout (runs indefinitely). SEE ALSO podman(1), podman-system-connection(1), containers.conf(5) HISTORY January 2020, Originally compiled by Brent Baude <bbaude@redhat.com> November 2020, Updated by Jhon Honce (jhonce at redhat dot com) podman-system-service(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLES | SEE ALSO | HISTORY
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