![]() This value declares the service watchdog timeout. See Timer string format for syntax examples. Termination is via SIGTERM (and SIGKILL if that doesn’t work).ĭeclares that the service is activated by a timer and that the app must be a daemon. Time duration units can be 10ns, 10us, 10ms, 10s, 10m. The length of time to wait before terminating a service. Can be one of either sigterm, sigterm-all, sighup, sighup-all, sigusr1, sigusr1-all, sigusr2, sigusr2-all, sigint and sigint-all. This can be to used to gracefully handle a daemon stop or restart, such as when a refresh happens, by allowing the daemon to reach a stoppable state first.ĭefines which termination signal to use when stopping the daemon. Optional time to wait for daemon to start.Īn optional executable command to run before the daemon is stopped, and the daemon is not stopped until the specified stop-command terminates. Requires an activated daemon socket, and works with the network-bind interface to map a daemon’s socket to a service and activate it. See the rvice manual on RestartSec for details. Example: reload-command: sbin/nginx -s reloadĭefines when a service should be restarted, using values returned from systemd service exit status.Ĭan be one of. ĭefines the command within the snap to be executed when a service needs to be restarted or reloaded after a configuration change, as initiated with the snap restart -reload command. Can be either restart, endure, (do not restart) or ignore-running (does not refresh running services to facilitate the refresh app awareness feature). Sets the command to run from inside the snap after a service stops.Ĭontrols whether a daemon should be restarted during a snap refresh. The snap could then use snapctl with a hook, for instance, or another management agent. Applications must be part of the same snap.ĭefines whether a freshly installed daemon is started automatically, or whether startup control is deferred to the snap. Applications must be part of the same snap.Īn ordered list of applications the daemon is to be started before. In addition to the above types of daemon or service, the following can be set to help manage how a service is run, how it can be stopped, and what should happen after it stops:Īn ordered list of applications the daemon is to be started after. Note this requires usage of the daemon-notify interface. This isn’t the recommended behaviour on a modern Linux system.Īssumes the command will send a signal to systemd to indicate its running state. The configured command calls fork() as part of its start-up and the parent process is then expected to exit when start-up is complete. After completion, the daemon is still considered active and running. Run once and exit after completion, notifying systemd. Run for as along as the service is active - this is typically the default option. The value for daemon: can be one of the following: To define an executable as a daemon or service, add daemon: simple to its apps stanza: apps: If you need to add user configurable options to your service or daemon, such as which port it should use, see Adding snap configuration. To set memory and CPU resource limits for a service or daemon, see Quota groups Services and daemons can also be managed from within a snap, such as via a hook, with the snapctl. See Service management for details on starting and stopping services from the snap command. ![]() But a daemon user and group can alternatively be created within a snap to provide similar user and group level control outside of a snap’s confinement. ![]() Snap confinement prohibits a system’s users and groups from running as traditional services might, such as under a user’s ownership. When creating snapcraft.yaml to build a new snap, a snap’s executable component can be either exposed as a command or run as a background service or daemon.įor details on how to expose an executable from its constituent parts, see Defining a command.Ī snap daemon or service behaves the same as a native daemon or service, and will either start automatically at boot time and end when the machine is shutdown, or start and stop on demand through socket activation. GitHub workflow from a private repository.
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