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Kill child processes

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On Unix, child processes are not killed when parent dies.

Each process is part of a process group (pgid). When pgid == pid,
it is the process group leader.

node creates child processes with the parent as the group leader
(detached = false).

You can send a signal to entire group using kill(-pgid), as in,
negative value in argument. Systemd can be made to do this by
setting the KillMode=control-group.

Unrelated: Process groups reside inside session groups. Each session
group has a controlling terminal. Only one process in the session
group has access to the terminal. Process group is basically like
a bash pipeline. A session group is the entire login session with only
one process having terminal access at a time.

Fixes #543
This commit is contained in:
girish@cloudron.io
2016-01-21 17:40:41 -08:00
parent 022ff89836
commit bcb0e61bfc
4 changed files with 6 additions and 2 deletions
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3
setup/container/systemd/box.service
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@@ -9,7 +9,8 @@ WorkingDirectory=/home/yellowtent/box
Restart=always
ExecStart=/usr/bin/node --max_old_space_size=150 /home/yellowtent/box/box.js
Environment="HOME=/home/yellowtent" "USER=yellowtent" "DEBUG=box*,connect-lastmile" "BOX_ENV=cloudron" "NODE_ENV=production"
KillMode=process
; kill apptask processes as well
KillMode=control-group
User=yellowtent
Group=yellowtent
MemoryLimit=200M