monitoring systemd services

netdata monitors systemd services. Example:

Support per distribution:

system	systemd services charts shown	tree /sys/fs/cgroup	comments
Arch Linux	YES
Gentoo	NO		can be enabled, see below
Ubuntu 16.04 LTS	YES
Ubuntu 16.10	YES	here
Fedora 25	YES	here
Debian 8	NO		can be enabled, see below
AMI	NO	here	not a systemd system
Centos 7.3.1611	NO	here	can be enabled, see below

how to enable cgroup accounting on systemd systems that is by default disabled

You can verify there is no accounting enabled, by running systemd-cgtop. The program will show only resources for cgroup /, but all services will show nothing.

To enable cgroup accounting, execute this:

sed -e 's|^#Default\(.*\)Accounting=.*$|Default\1Accounting=yes|g' /etc/systemd/system.conf >/tmp/system.conf

To see the changes it made, run this:

# diff /etc/systemd/system.conf /tmp/system.conf
40,44c40,44
< #DefaultCPUAccounting=no
< #DefaultIOAccounting=no
< #DefaultBlockIOAccounting=no
< #DefaultMemoryAccounting=no
< #DefaultTasksAccounting=yes
---
> DefaultCPUAccounting=yes
> DefaultIOAccounting=yes
> DefaultBlockIOAccounting=yes
> DefaultMemoryAccounting=yes
> DefaultTasksAccounting=yes

If you are happy with the changes, run:

# copy the file to the right location
sudo cp /tmp/system.conf /etc/systemd/system.conf

# restart systemd to take it into account
sudo systemctl daemon-reexec

(systemctl daemon-reload does not reload the configuration of the server - so you have to execute systemctl daemon-reexec).

Now, when you run systemd-cgtop, services will start reporting usage (if it does not, restart a service - any service - to wake it up). Refresh your netdata dashboard, and you will have the charts too.

In case memory accounting is missing, you will need to enable it at your kernel, by appending the following kernel boot options and rebooting:

cgroup_enable=memory swapaccount=1

You can add the above, directly at the linux line in your /boot/grub/grub.cfg or appending them to the GRUB_CMDLINE_LINUX in /etc/default/grub (in which case you will have to run update-grub before rebooting). On DigitalOcean debian images you may have to set it at /etc/default/grub.d/50-cloudimg-settings.cfg.