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guide.md: clarify cgroups documentation

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Update the documentation to reflect cgroups version 2 support.
Also, add a section on dealing with orphaned service processes.

This fixes #94.
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William Hubbs 2017-09-14 10:39:38 -05:00
parent 457f928e79
commit 6d7713a758
1 changed files with 28 additions and 9 deletions
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@ -241,17 +241,36 @@ messages to a file), and a few others.
# ulimit and CGroups
Setting `ulimit` and `nice` values per service can be done through the `rc_ulimit`
variable.
Setting `ulimit` and `nice` values per service can be done through the
`rc_ulimit` variable.
Under Linux, OpenRC can optionally use CGroups for process management.
By default each service script's processes are migrated to their own CGroup.
Under Linux, OpenRC can use cgroups for process management as well. Once
the kernel is configured appropriately, the `rc_cgroup_mode` setting in
/etc/rc.conf should be used to control whether cgroups version one,,
two, or both are used. The default is to use both if they are available.
By changing certain settings in the service's `conf.d` file limits can be
enforced per service. These settings are documented in detail in the
default /etc/rc.conf under `LINUX CGROUPS RESOURCE MANAGEMENT`.
# Dealing with Orphaned Processes
It is possible to get into a state where there are orphaned processes
running which were part of a service. For example, if you are monitoring
a service with supervise-daemon and supervise-daemon dies for an unknown
reason. The way to deal with this will be different for each system.
On Linux systems with cgroups enabled, the cgroup_cleanup command is
added to all services. You can run it manually, when the service is
stopped, by using:
```
# rc-service someservice cgroup_cleanup
```
The `rc_cgroup_cleanup` setting can be changed to yes to make this
happen automatically when the service is stopped.
By changing certain values in the `conf.d` file limits can be enforced per
service. It is easy to find orphan processes of a service that persist after
`stop()`, but by default these will NOT be terminated.
To change this add `rc_cgroup_cleanup="yes"` in the `conf.d` files for services
where you desire this functionality.
# Caching