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When to use fork or not to fork in systemd?
Type=forking is for historical services that cannot be run in foreground. In this case process itself will take care of its deamonizing, but systemd should know the child pid somehow so you need to provide PIDFile= option as well. option not to fork.
What’s the difference between forking and option not to fork?
Type=forking is for historical services that cannot be run in foreground. In this case process itself will take care of its deamonizing, but systemd should know the child pid somehow so you need to provide PIDFile= option as well. option not to fork. Many programs come with options to fork in the background or not to fork.
Which is the readiness protocol used by systemd?
Type determines the readiness protocol used by systemd. In the case of Type=simple, there is no protocol. systemd assumes that as soon as the binary is exec’d, the service is available.
When is a service ready for a fork?
For Type=forking, services are considered ready after the MainPID exits (after the double fork), allowing for time to setup sockets or other resources needed to handle client requests (e.g. a database server or a web server).
What does type = simple do in systemd?
What Type=simple does is, well, simple. from systemd.service (5): If set to simple (the default value if neither Type= nor BusName= are specified), it is expected that the process configured with ExecStart= is the main process of the service.
What is the default type of systemd service?
Type=simple (default): systemd considers the service to be started up immediately. The process must not fork. Do not use this type if other services need to be ordered on this service, unless it is socket activated. Type=forking: systemd considers the service started up once the process forks and the parent has exited.
When to use type = simple and avoid forking?
When converting from sysvinit scripts to systemd init files, the default practice seems to be to start services without forking, and to use Type=simple in the service description. What Type=simple does is, well, simple. from systemd.service (5):
How to avoid forking in sysvinit systemd?
Starting OpenBSD Secure Shell server: sshd/etc/ssh/sshd_config: line 4: Bad configuration option: blah /etc/ssh/sshd_config: terminating, 1 bad configuration options failed! root@debian:~# It’s not trivial to fix that. The implicit behaviour of sysvinit is that fork () sort-of signals the end of service initialization.
How to run systemd service as specific user?
Can the service use a domain user instead of the local user when running. Our client machine is redhat linux on which tomcat is running as a service. Now how can we run the tomcat as the same domain user that has access to the MSSQL DB ? You can just place the username in the User=USERNAME field without any domain details.
How to run service as specific user in Linux?
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