cgroup ubuntu 18.04 howto

Install required packages

apt install cgroup-tools

copy cgred.conf from examples

cp /usr/share/doc/cgroup-tools/examples/cgred.conf /etc/

/etc/cgconfig.conf

group web2 {
cpu {
cpu.cfs_quota_us=10000;
}
memory {
memory.limit_in_bytes = 1024m;
}
}

cpu.cfs_quota_us = 10000 equals to 10% cpu usage
memory.limit_in_bytes = 1024 equals to 1G of system memory


/etc/cgrules.conf

#<user>    <controllers>           <destination>
web2 cpu,memory web2

This will limit every process of the user web2 to 10% CPU and 1G of memory.


For testing use this commands:

/usr/sbin/cgconfigparser -l /etc/cgconfig.conf
/usr/sbin/cgrulesengd -vvv

check if cgroup’s are working properly

cat /sys/fs/cgroup/cpu/web2/tasks
cat /sys/fs/cgroup/memory/web2/tasks

Here my systemd service files, install them the usual systemd way

cgconfigparser.service

[Unit]
Description=cgroup config parser
After=network.target

[Service]
User=root
Group=root
ExecStart=/usr/sbin/cgconfigparser -l /etc/cgconfig.conf
Type=oneshot

[Install]
WantedBy=multi-user.target

cgrulesgend.service

[Unit]
Description=cgroup rules generator
After=network.target cgconfigparser.service

[Service]
User=root
Group=root
Type=forking
EnvironmentFile=-/etc/cgred.conf
ExecStart=/usr/sbin/cgrulesengd
Restart=on-failure

[Install]
WantedBy=multi-user.target

reload systemd and start services

systemctl daemon-reload
systemctl enable cgconfigparser
systemctl enable cgrulesgend
systemctl start cgconfigparser
systemctl start cgrulesgend

Have fun!