Red Hat ENTERPRISE LINUX 5.4 - SYSTEMTAP BEGINNERS GUIDE Technické informace stáhnout pdf (Strana 141)

Kernel Control Groups 127

Network Traffic (Resource Control)

With cgroup_tc, a network traffic controller is available. It can be used

to manage traffic that is associated with the tasks in a cgroup. Additionally,

cls_flow can classify packets based on the tc_classid field in the packet.

For example, to limit the traffic from all tasks from a file_server cgroup to

100Mbps, proceed as follows:

# create a file_transfer cgroup and assign it a unique classid

# of 0x10 - this will be used later to direct packets.

mkdir -p /dev/cgroup

mount -t cgroup tc -otc /dev/cgroup

mkdir /dev/cgroup/file_transfer

echo 0x10 > /dev/cgroup/file_transfer/tc.classid

echo $PID_OF_FILE_XFER_PROCESS > /dev/cgroup/file_transfer/tasks

# Now create an HTB class that rate-limits traffic to 100 mbits and

attach

# a filter to direct all traffic from the file_transfer cgroup

# to this new class.

tc qdisc add dev eth0 root handle 1: htb

tc class add dev eth0 parent 1: classid 1:10 htb rate 100mbit ceil

100mbit

tc filter add dev eth0 parent 1: handle 800 protocol ip prio 1 \

flow map key cgroup-classid baseclass 1:10

This example is taken from https://lwn.net/Articles/291161/,

where you can find more information about this feature.

10.4 Using Controller Groups

10.4.1 Prerequisites

To conveniently use cgroups, install the following additional packages:

• libcgroup1 — basic user space tools to simplify resource management

• cpuset — contains the cset to manipulate cpusets

• libcpuset1 — C API to cpusets

• kernel-source — only needed for documentation purposes

• lxc — Linux container implementation

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Red Hat ENTERPRISE LINUX 5.4 - SYSTEMTAP BEGINNERS GUIDE Technické informace Strana 141