Re: [systemd-devel] Question about After/Before of services
On 08/09/2012 06:28 AM, WANG Chao wrote: Hi, list As you see in the subject, this question comes from a lazy guy like me, who doesn't read the systemd source code at all :P Hey, no need to read the source code :). Please see the man page: http://www.freedesktop.org/software/systemd/man/systemd.unit.html Zbyszek The silly question is if A is configured to 'Wants:B' and 'After:B', will A start exactly after B is finished or after B is started? If A is started after B is started (still parallel somehow), is there anything I can do to control A to be started right after B is done? ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] Question about After/Before of services
On 08/09/2012 01:59 PM, Zbigniew Jędrzejewski-Szmek wrote: On 08/09/2012 06:28 AM, WANG Chao wrote: Hi, list As you see in the subject, this question comes from a lazy guy like me, who doesn't read the systemd source code at all :P Hey, no need to read the source code :). Please see the man page: http://www.freedesktop.org/software/systemd/man/systemd.unit.html Zbyszek Hi, Trust me, I've read that section hundreds of times. I'm actually not that lazy ;) I come up with this confusion when I configure a service A 'wants' and 'after' B. I thought they should be started one by one in a exact order, but actually they intersected and run in parallel. Anyway, thanks for the rely. The silly question is if A is configured to 'Wants:B' and 'After:B', will A start exactly after B is finished or after B is started? If A is started after B is started (still parallel somehow), is there anything I can do to control A to be started right after B is done? ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- Thanks, WANG Chao ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] Question about After/Before of services
On 08/09/2012 10:04 AM, WANG Chao wrote: On 08/09/2012 01:59 PM, Zbigniew Jędrzejewski-Szmek wrote: On 08/09/2012 06:28 AM, WANG Chao wrote: Hi, list As you see in the subject, this question comes from a lazy guy like me, who doesn't read the systemd source code at all :P Hey, no need to read the source code :). Please see the man page: http://www.freedesktop.org/software/systemd/man/systemd.unit.html Zbyszek Hi, Trust me, I've read that section hundreds of times. I'm actually not that lazy ;) I come up with this confusion when I configure a service A 'wants' and 'after' B. I thought they should be started one by one in a exact order, but actually they intersected and run in parallel. So: A after B, A wants B, means that when A is started, B will be started first, and after B is started, A will be started second. So the startup phase is sequential, but later on run in parallel. Reading your post again, I think you might have something like startup scripts in mind, where the first should finish _running_ and exit before the second one starts. You can achieve this by adding Type = oneshot to the first service (or even to both of them). You also say right after: sorry, can't help you here. There's no way to ensure that the system will not do some work in between. Zbyszek The silly question is if A is configured to 'Wants:B' and 'After:B', will A start exactly after B is finished or after B is started? If A is started after B is started (still parallel somehow), is there anything I can do to control A to be started right after B is done? ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] Question about After/Before of services
On 08/09/2012 04:28 AM, WANG Chao wrote: Hi, list As you see in the subject, this question comes from a lazy guy like me, who doesn't read the systemd source code at all :P The silly question is if A is configured to 'Wants:B' and 'After:B', will A start exactly after B is finished or after B is started? Yes If A.service unit has Wants=B.service and After=B.service it will be start after B.service has finished starting *unless* B.service unit is Type=oneshot service then it will be started immediately after B.service is has been started not when B.service has finished starting... JBG ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] Question about After/Before of services
2012/8/9 Jóhann B. Guðmundsson johan...@gmail.com: On 08/09/2012 04:28 AM, WANG Chao wrote: Hi, list As you see in the subject, this question comes from a lazy guy like me, who doesn't read the systemd source code at all :P The silly question is if A is configured to 'Wants:B' and 'After:B', will A start exactly after B is finished or after B is started? Yes If A.service unit has Wants=B.service and After=B.service it will be start after B.service has finished starting *unless* B.service unit is Type=oneshot service then it will be started immediately after B.service is has been started not when B.service has finished starting... JBG Or unless B.service is Type=simple (the default). In this case systemd has no way to tell when B.service has finished starting and continues to start A.service right away. Mirco ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] Question about After/Before of services
On 08/09/2012 05:56 PM, Zbigniew Jędrzejewski-Szmek wrote: On 08/09/2012 10:04 AM, WANG Chao wrote: On 08/09/2012 01:59 PM, Zbigniew Jędrzejewski-Szmek wrote: On 08/09/2012 06:28 AM, WANG Chao wrote: Hi, list As you see in the subject, this question comes from a lazy guy like me, who doesn't read the systemd source code at all :P Hey, no need to read the source code :). Please see the man page: http://www.freedesktop.org/software/systemd/man/systemd.unit.html Zbyszek Hi, Trust me, I've read that section hundreds of times. I'm actually not that lazy ;) I come up with this confusion when I configure a service A 'wants' and 'after' B. I thought they should be started one by one in a exact order, but actually they intersected and run in parallel. So: A after B, A wants B, means that when A is started, B will be started first, and after B is started, A will be started second. So the startup phase is sequential, but later on run in parallel. It matches what I saw. Make sense. Reading your post again, I think you might have something like startup scripts in mind, where the first should finish _running_ and exit before the second one starts. You can achieve this by adding Type = oneshot How could I miss this :( to the first service (or even to both of them). You also say right after: sorry, can't help you here. There's no way to ensure that the system will not do some work in between. Sorry, when I said right after, I didn't mean right after.. Just after is fine. Thanks for your help, I really appreciate it! I learn a lot :) Zbyszek The silly question is if A is configured to 'Wants:B' and 'After:B', will A start exactly after B is finished or after B is started? If A is started after B is started (still parallel somehow), is there anything I can do to control A to be started right after B is done? -- Thanks, WANG Chao ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
[systemd-devel] Question about After/Before of services
Hi, list As you see in the subject, this question comes from a lazy guy like me, who doesn't read the systemd source code at all :P The silly question is if A is configured to 'Wants:B' and 'After:B', will A start exactly after B is finished or after B is started? If A is started after B is started (still parallel somehow), is there anything I can do to control A to be started right after B is done? -- Thanks, WANG Chao ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
