Re: Daemon Tools Free Full Version
Hilke Mcnally
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Installs the daemontools package, using the node['daemontools']['package_name'] attribute. On Debian family systems, this is daemontools-run, which depends on daemontools (and provides run time / init system configuration).
On other untested platforms (e.g., RHEL family), if a local daemontools package is built and it sets up the appropriate init system configuration (systemd, upstart, inittab), then this recipe will be sufficient. Otherwise, write a custom recipe.
The source installation of daemontools should work on most other platforms that do not have a package available. A custom recipe may be required to configure the svscan service init script or upstart or systemd configuration.
Enables and starts the svscan service. This requires that the local system have properly set up the svscan service for the appropriate init system. It's outside the scope of this cookbook to detect this for every possible platform, so a custom recipe may be required. For example, Debian family daemontools-run package provides this.
Include the daemontools recipe on nodes that should have daemontools installed for managing services. Use the daemontools_service custom resource for any services that should be managed by daemontools. In your cookbooks where daemontools_service is used, create the appropriate run and log-run scripts for your service. For example if the service is "flowers":
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DAEMON Tools Ultra incorporates other simple features as well, like creating bootable USB drives with just a few clicks, and viewing all your disc images in a catalogue, with additional information about each one extracted automatically from the Internet.
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Daemontools-encore is a backwards compatible, enhanced version of Daniel J. Bernstein's daemontools package, written by Bruce Guenter. A summary of the features that have been added to daemontools-encore is available here. The last release of daemontools-encore was in 2014 (as of 2021-11).
Bernstein daemontools and daemontools-encore implement process supervision: programs that run as long-lived processes, such as a server program, can be supervised by being run as a child process of a supervisor. The supervisor can detect if the process, also called the service or the daemon in this context, has unexpectedly terminated, e.g. because it exited with an error status or was killed by a signal, and automatically restart it. The supervisor also provides a reliable interface for controlling both the supervised process and itself, to send signals to the process, and to query status information about it.
All this is based on standard POSIX features: a process reliably knows its child's process ID (PID), because it is the return value of the fork() call that creates it, knows when its child terminates, because it is notified with a SIGCHLD signal, and can obtain exit status information when it happens using the wait() or waitpid() calls.
The program that implements the supervisor features in Bernstein daemontools and daemontools-encore is supervise. Supervision for a single process is configured using a service directory (or servicedir). A servicedir is an ordinary directory containing at least one executable file named run. It can also contain an optional, regular file named down. The (absolute or relative to the working directory) pathname of this directory is then passed as an argument to supervise. This however is not supposed to be done directly by the user, but to happen indirectly as a consequence of running svscan.
When supervise is invoked, it changes its working directory to the specifed servicedir, and executes the contained run file as a child process, unless there is also a down file, or, for daemontools-encore only, a start file (see the start, stop and notify files, and the daemontools-encore extended service state). Daemontools-encore's supervise also makes the child process the leader of a new session using the POSIX setsid() call, unless the servicedir contains a regular file named no-setsid. In that case, the child process will run in supervise's session instead. Making the child process a session leader with Bernstein daemontools requires using the pgrphack program inside run (see supervised process execution state changes). If supervise is invoked with a servicedir that contains a down file, the run file won't be executed, but the service can be started later with the svc program (see controlling supervised processes). The contents of the down and no-setsid files are ignored, so they are usually empty.
run can have any file format that the kernel knows how to execute, but is usually a shell script that performs some sort of initialization, and then calls the real program intended to be supervised, using the shell's exec builtin utility. This allows the program to run without creating a new process, so it will have the same PID as the run script, and from there on become the supervised process. supervise waits for 1 second between two child process spawns, so that it does not loop too quickly if the process exits immediately. The daemontools-encore version of supervise also has special behaviour when it receives a signal: if it receives a SIGTERM signal, it behaves as if an svc -dx command naming the corresponding servicedir had been used (see controlling supervised processes), if it receives a SIGTSTP signal, it sends a SIGSTOP signal to the supervised process, as if an svc -p command naming the corresponding servicedir had been used, and if it receives a SIGCONT signal, it sends a SIGCONT signal to the supervised process, as if an svc -c command naming the corresponding servicedir had been used.
Programs that fail to adhere to certain design criteria, including those that use fork() in order to "put the daemon into the background" [4], might not be able to be supervised. Sometimes programs can meet those criteria if passed certain options (e.g. a 'run in the foreground' option) on invocation.
The supervise program keeps control files in a subdirectory of the servicedir, also named supervise. If this subdirectory doesn't exist when supervise is invoked, it will be created, as well as any of its missing files. If the servicedir contains a supervise symbolic link to directory instead of a subdirectory, supervise will follow it and use the linked-to directory for its control files. Daemontools-encore also allows setting the name of this control directory via the SUPERVISEDIR environment variable, see environment variables.
Bernstein daemontools and daemontools-encore allow supervising a set of processes running in parallel using the svscan program and a scan directory (or scandir). A scan directory is a directory that contains service directories and/or symbolic links to services directories. Invoking svscan with the (absolute or relative to the working directory) path of the scandir as its first argument (and only argument for Bernstein daemontools' svscan) launches one child supervise process for each contained service directory with a name that does not start with a dot ('.'). If svscan is called with no arguments, it assumes the working directory is the scandir, otherwise it changes its working directory to the specified scandir.
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