collectd-systemd

A collectd plugin which checks if given systemd services are in "running" state and sends graphite metrics with 1.0 or 0.0 value.

The plugin is particularly useful together with grafana's alerting.

Quick start

Make sure Python dbus bindings are installed in your system:

• Debian/Ubuntu: sudo apt-get install python-dbus
• Fedora/CentOS: sudo yum install dbus-python

Copy collectd_systemd.py to collectd Python plugin directory (usually /usr/lib64/collectd/python/ or /usr/lib/collectd/python/). Add following snippet do /etc/collectd.conf:

LoadPlugin python

<Plugin python>
    ModulePath "/usr/lib64/collectd/python"
    Import "collectd_systemd"

    <Module collectd_systemd>
        Service sshd nginx postgresql
        Service httpd
    </Module>
</Plugin>

If your service has dash in the name, you need to wrap that name in double quotes:

<Module collectd_systemd>
    Service "celery-bots" "gunicorn-data"
</Module>

Restart collectd daemon and open grafana web ui. Add a new graph with following query:

aliasSub(collectd.*.systemd-*.gauge-running, '.+systemd-(.+)\..+', '\1')

You should see all configured systemd services in the graph. Now it's enough to add an alert for values lower than 1.0 to be paged when services are down.

Configuration

Following configuration options are supported:

• Service: one or more systemd services to monitor. Separate multiple services with spaces. Multiple services lines can be specified when they will be concatinated.
• Interval: check interval. It's ok to keep the default (60 seconds)
• Verbose: enable verbose logging (off by default)

Running tests

Install tox using pip or Linux package manager.

Type tox to run tests.

Selinux

On Redhat systems some selinux policy may be needed. Create a file collectd_systemd.te:

policy_module(collectd_systemd,0.1);
require {
    type collectd_t;
    type initrc_exec_t;
}
dbus_session_client(system,collectd_t)
init_status(collectd_t)
init_dbus_chat(collectd_t)
systemd_status_all_unit_files(collectd_t)
allow collectd_t initrc_exec_t:service { status };

Create a file collectd_systemd.pp and install it:

make -f /usr/share/selinux/devel/Makefile collectd_systemd.pp
semodule -i collectd_systemd.pp