Restarting a service from a script
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I have a init script - /etc/init.d/myservice, which starts some processes, including a CLI process. And from this CLI process, I am adding a command which can be used to restart the service (restart ourselves - kind of).
What I tried - from a script (that is spawned from the CLI command), ran sudo service myservice restart, where restart is stop;start.
But, this doesn't work! i.e, even though the stop happens, by the time start part is executing, the script terminates (not with any signals, but plain EXIT).
I tried combinations of nohup, disown etc, but didn't seem to work! I am not sure how to complete the restart without getting terminated - any pointers, or workarounds to debug further ?
To summarize:
myservice-> spawns many processes, including CLI- CLI -> has a
restartcommand, which invokes a script
script doessudo service myservice restart
--More info--
I'm on Ubuntu 12.04, i.e, upstart
bash init-script
edited Aug 26 '14 at 13:29
slm♦
250k66526683
asked Aug 26 '14 at 12:18
vyomvyom
133114
add a comment |
I have a init script - /etc/init.d/myservice, which starts some processes, including a CLI process. And from this CLI process, I am adding a command which can be used to restart the service (restart ourselves - kind of).
What I tried - from a script (that is spawned from the CLI command), ran sudo service myservice restart, where restart is stop;start.
But, this doesn't work! i.e, even though the stop happens, by the time start part is executing, the script terminates (not with any signals, but plain EXIT).
I tried combinations of nohup, disown etc, but didn't seem to work! I am not sure how to complete the restart without getting terminated - any pointers, or workarounds to debug further ?
To summarize:
myservice-> spawns many processes, including CLI- CLI -> has a
restartcommand, which invokes a script
script doessudo service myservice restart
--More info--
I'm on Ubuntu 12.04, i.e, upstart
bash init-script
edited Aug 26 '14 at 13:29
slm♦
250k66526683
asked Aug 26 '14 at 12:18
vyomvyom
133114
1
What's the OS, init system (upstart, systemd, sysvinit...)?
– Stéphane Chazelas
Aug 26 '14 at 13:01
How is the "stop" action done? Does it help if you add atrap '' TERMin your restart script?
– Stéphane Chazelas
Aug 26 '14 at 13:02
@StéphaneChazelas added more info,stopdoes a usualkillby process name. If I addtrap..TERMwouldn't it affect other ways of start/stop - like, from shell if one doessudo myservice stop?
– vyom
Aug 26 '14 at 13:09
would your kill by process name (it's better to combine that with pid files to avoid problems or use cgroups as systemd) not possibly kill your script?
– Stéphane Chazelas
Aug 26 '14 at 13:16
I don't understand cgroups as systemd :(. The script name is not in the list of processes to be stopped.
– vyom
Aug 26 '14 at 13:24
add a comment |
I have a init script - /etc/init.d/myservice, which starts some processes, including a CLI process. And from this CLI process, I am adding a command which can be used to restart the service (restart ourselves - kind of).
What I tried - from a script (that is spawned from the CLI command), ran sudo service myservice restart, where restart is stop;start.
But, this doesn't work! i.e, even though the stop happens, by the time start part is executing, the script terminates (not with any signals, but plain EXIT).
I tried combinations of nohup, disown etc, but didn't seem to work! I am not sure how to complete the restart without getting terminated - any pointers, or workarounds to debug further ?
To summarize:
myservice-> spawns many processes, including CLI- CLI -> has a
restartcommand, which invokes a script
script doessudo service myservice restart
--More info--
I'm on Ubuntu 12.04, i.e, upstart
bash init-script
edited Aug 26 '14 at 13:29
slm♦
250k66526683
asked Aug 26 '14 at 12:18
vyomvyom
133114
I have a init script - /etc/init.d/myservice, which starts some processes, including a CLI process. And from this CLI process, I am adding a command which can be used to restart the service (restart ourselves - kind of).
What I tried - from a script (that is spawned from the CLI command), ran sudo service myservice restart, where restart is stop;start.
But, this doesn't work! i.e, even though the stop happens, by the time start part is executing, the script terminates (not with any signals, but plain EXIT).
I tried combinations of nohup, disown etc, but didn't seem to work! I am not sure how to complete the restart without getting terminated - any pointers, or workarounds to debug further ?
To summarize:
myservice-> spawns many processes, including CLI- CLI -> has a
restartcommand, which invokes a script
script doessudo service myservice restart
--More info--
I'm on Ubuntu 12.04, i.e, upstart
bash init-script
bash init-script
edited Aug 26 '14 at 13:29
slm♦
250k66526683
asked Aug 26 '14 at 12:18
vyomvyom
133114
edited Aug 26 '14 at 13:29
slm♦
250k66526683
asked Aug 26 '14 at 12:18
vyomvyom
133114
edited Aug 26 '14 at 13:29
slm♦
250k66526683
edited Aug 26 '14 at 13:29
slm♦
250k66526683
edited Aug 26 '14 at 13:29
slm♦
250k66526683
250k66526683
asked Aug 26 '14 at 12:18
vyomvyom
133114
asked Aug 26 '14 at 12:18
vyomvyom
133114
asked Aug 26 '14 at 12:18
vyomvyom
133114
133114
1
What's the OS, init system (upstart, systemd, sysvinit...)?
– Stéphane Chazelas
Aug 26 '14 at 13:01
How is the "stop" action done? Does it help if you add atrap '' TERMin your restart script?
– Stéphane Chazelas
Aug 26 '14 at 13:02
@StéphaneChazelas added more info,stopdoes a usualkillby process name. If I addtrap..TERMwouldn't it affect other ways of start/stop - like, from shell if one doessudo myservice stop?
– vyom
Aug 26 '14 at 13:09
would your kill by process name (it's better to combine that with pid files to avoid problems or use cgroups as systemd) not possibly kill your script?
– Stéphane Chazelas
Aug 26 '14 at 13:16
I don't understand cgroups as systemd :(. The script name is not in the list of processes to be stopped.
– vyom
Aug 26 '14 at 13:24
add a comment |
1
What's the OS, init system (upstart, systemd, sysvinit...)?
– Stéphane Chazelas
Aug 26 '14 at 13:01
How is the "stop" action done? Does it help if you add atrap '' TERMin your restart script?
– Stéphane Chazelas
Aug 26 '14 at 13:02
@StéphaneChazelas added more info,stopdoes a usualkillby process name. If I addtrap..TERMwouldn't it affect other ways of start/stop - like, from shell if one doessudo myservice stop?
– vyom
Aug 26 '14 at 13:09
would your kill by process name (it's better to combine that with pid files to avoid problems or use cgroups as systemd) not possibly kill your script?
– Stéphane Chazelas
Aug 26 '14 at 13:16
I don't understand cgroups as systemd :(. The script name is not in the list of processes to be stopped.
– vyom
Aug 26 '14 at 13:24
1
1
What's the OS, init system (upstart, systemd, sysvinit...)?
– Stéphane Chazelas
Aug 26 '14 at 13:01
What's the OS, init system (upstart, systemd, sysvinit...)?
– Stéphane Chazelas
Aug 26 '14 at 13:01
How is the "stop" action done? Does it help if you add a
trap '' TERM in your restart script?– Stéphane Chazelas
Aug 26 '14 at 13:02
How is the "stop" action done? Does it help if you add a
trap '' TERM in your restart script?– Stéphane Chazelas
Aug 26 '14 at 13:02
@StéphaneChazelas added more info,
stop does a usual kill by process name. If I add trap..TERM wouldn't it affect other ways of start/stop - like, from shell if one does sudo myservice stop ?– vyom
Aug 26 '14 at 13:09
@StéphaneChazelas added more info,
stop does a usual kill by process name. If I add trap..TERM wouldn't it affect other ways of start/stop - like, from shell if one does sudo myservice stop ?– vyom
Aug 26 '14 at 13:09
would your kill by process name (it's better to combine that with pid files to avoid problems or use cgroups as systemd) not possibly kill your script?
– Stéphane Chazelas
Aug 26 '14 at 13:16
would your kill by process name (it's better to combine that with pid files to avoid problems or use cgroups as systemd) not possibly kill your script?
– Stéphane Chazelas
Aug 26 '14 at 13:16
I don't understand cgroups as systemd :(. The script name is not in the list of processes to be stopped.
– vyom
Aug 26 '14 at 13:24
I don't understand cgroups as systemd :(. The script name is not in the list of processes to be stopped.
– vyom
Aug 26 '14 at 13:24
add a comment |
2 Answers
2
active
oldest
votes
Before starting the service again you might want to wait for a few seconds so that it stops properly. You can delay your script with the following line
# waiting for 5 seconds
sleep 5
You can see more details here - http://www.cyberciti.biz/faq/linux-unix-sleep-bash-scripting/
answered Aug 26 '14 at 13:00
redmosesredmoses
1
thestopis happening, but atstartthe script terminates.
– vyom
Aug 26 '14 at 13:07
add a comment |
I had searched for quite some time, but I found one solution here to this SuperUser Q&A titled: How do I detach a process from Terminal, entirely?, after posting my question here.
| at now
edited Mar 20 '17 at 10:18
Community♦
1
answered Aug 26 '14 at 13:06
vyomvyom
133114
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Before starting the service again you might want to wait for a few seconds so that it stops properly. You can delay your script with the following line
# waiting for 5 seconds
sleep 5
You can see more details here - http://www.cyberciti.biz/faq/linux-unix-sleep-bash-scripting/
answered Aug 26 '14 at 13:00
redmosesredmoses
1
thestopis happening, but atstartthe script terminates.
– vyom
Aug 26 '14 at 13:07
add a comment |
Before starting the service again you might want to wait for a few seconds so that it stops properly. You can delay your script with the following line
# waiting for 5 seconds
sleep 5
You can see more details here - http://www.cyberciti.biz/faq/linux-unix-sleep-bash-scripting/
answered Aug 26 '14 at 13:00
redmosesredmoses
1
thestopis happening, but atstartthe script terminates.
– vyom
Aug 26 '14 at 13:07
add a comment |
Before starting the service again you might want to wait for a few seconds so that it stops properly. You can delay your script with the following line
# waiting for 5 seconds
sleep 5
You can see more details here - http://www.cyberciti.biz/faq/linux-unix-sleep-bash-scripting/
answered Aug 26 '14 at 13:00
redmosesredmoses
1
Before starting the service again you might want to wait for a few seconds so that it stops properly. You can delay your script with the following line
# waiting for 5 seconds
sleep 5
You can see more details here - http://www.cyberciti.biz/faq/linux-unix-sleep-bash-scripting/
answered Aug 26 '14 at 13:00
redmosesredmoses
1
answered Aug 26 '14 at 13:00
redmosesredmoses
1
answered Aug 26 '14 at 13:00
redmosesredmoses
1
answered Aug 26 '14 at 13:00
redmosesredmoses
1
1
thestopis happening, but atstartthe script terminates.
– vyom
Aug 26 '14 at 13:07
add a comment |
thestopis happening, but atstartthe script terminates.
– vyom
Aug 26 '14 at 13:07
the
stop is happening, but at start the script terminates.– vyom
Aug 26 '14 at 13:07
the
stop is happening, but at start the script terminates.– vyom
Aug 26 '14 at 13:07
add a comment |
I had searched for quite some time, but I found one solution here to this SuperUser Q&A titled: How do I detach a process from Terminal, entirely?, after posting my question here.
| at now
edited Mar 20 '17 at 10:18
Community♦
1
answered Aug 26 '14 at 13:06
vyomvyom
133114
add a comment |
I had searched for quite some time, but I found one solution here to this SuperUser Q&A titled: How do I detach a process from Terminal, entirely?, after posting my question here.
| at now
edited Mar 20 '17 at 10:18
Community♦
1
answered Aug 26 '14 at 13:06
vyomvyom
133114
add a comment |
I had searched for quite some time, but I found one solution here to this SuperUser Q&A titled: How do I detach a process from Terminal, entirely?, after posting my question here.
| at now
edited Mar 20 '17 at 10:18
Community♦
1
answered Aug 26 '14 at 13:06
vyomvyom
133114
I had searched for quite some time, but I found one solution here to this SuperUser Q&A titled: How do I detach a process from Terminal, entirely?, after posting my question here.
| at now
edited Mar 20 '17 at 10:18
Community♦
1
answered Aug 26 '14 at 13:06
vyomvyom
133114
edited Mar 20 '17 at 10:18
Community♦
1
edited Mar 20 '17 at 10:18
Community♦
1
edited Mar 20 '17 at 10:18
Community♦
1
1
answered Aug 26 '14 at 13:06
vyomvyom
133114
answered Aug 26 '14 at 13:06
vyomvyom
133114
answered Aug 26 '14 at 13:06
vyomvyom
133114
133114
add a comment |
add a comment |
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1
What's the OS, init system (upstart, systemd, sysvinit...)?
– Stéphane Chazelas
Aug 26 '14 at 13:01
How is the "stop" action done? Does it help if you add a
trap '' TERMin your restart script?– Stéphane Chazelas
Aug 26 '14 at 13:02
@StéphaneChazelas added more info,
stopdoes a usualkillby process name. If I addtrap..TERMwouldn't it affect other ways of start/stop - like, from shell if one doessudo myservice stop?– vyom
Aug 26 '14 at 13:09
would your kill by process name (it's better to combine that with pid files to avoid problems or use cgroups as systemd) not possibly kill your script?
– Stéphane Chazelas
Aug 26 '14 at 13:16
I don't understand cgroups as systemd :(. The script name is not in the list of processes to be stopped.
– vyom
Aug 26 '14 at 13:24