eBPF Socket

Plugin: ebpf.plugin Module: socket

Overview

Monitor bandwidth consumption per application for protocols TCP and UDP.

Attach tracing (kprobe, trampoline) to internal kernel functions according options used to compile kernel.

This collector is only supported on the following platforms:

• Linux

This collector supports collecting metrics from multiple instances of this integration, including remote instances.

The plugin needs setuid because it loads data inside kernel. Netada sets necessary permission during installation time.

eBPF Socket can be monitored further using the following other integrations:

• Applications
• Containers

Default Behavior

Auto-Detection

The plugin checks kernel compilation flags (CONFIG_KPROBES, CONFIG_BPF, CONFIG_BPF_SYSCALL, CONFIG_BPF_JIT) and presence of BTF files to decide which eBPF program will be attached.

Limits

The default configuration for this integration does not impose any limits on data collection.

Performance Impact

This thread will add overhead every time that an internal kernel function monitored by this thread is called. The estimated additional period of time is between 90-200ns per call on kernels that do not have BTF technology.

Setup

Prerequisites

Compile kernel

Check if your kernel was compiled with necessary options (CONFIG_KPROBES, CONFIG_BPF, CONFIG_BPF_SYSCALL, CONFIG_BPF_JIT) in /proc/config.gz or inside /boot/config file. Some cited names can be different accoring preferences of Linux distributions. When you do not have options set, it is necessary to get the kernel source code from https://kernel.org or a kernel package from your distribution, this last is preferred. The kernel compilation has a well definedd pattern, but distributions can deliver their configuration files with different names.

Now follow steps:

1. Copy the configuration file to /usr/src/linux/.config.
2. Select the necessary options: make oldconfig
3. Compile your kernel image: make bzImage
4. Compile your modules: make modules
5. Copy your new kernel image for boot loader directory
6. Install the new modules: make modules_install
7. Generate an initial ramdisk image (initrd) if it is necessary.
8. Update your boot loader

Configuration

Options

All options are defined inside section [global]. Options inside network connections are ignored for while.

Config options

Option	Description	Default	Required
update every	Data collection frequency.	10	no
ebpf load mode	Define whether plugin will monitor the call (entry) for the functions or it will also monitor the return (return).	entry	no
apps	Enable or disable integration with apps.plugin	no	no
cgroups	Enable or disable integration with cgroup.plugin	no	no
bandwidth table size	Number of elements stored inside hash tables used to monitor calls per PID.	16384	no
ipv4 connection table size	Number of elements stored inside hash tables used to monitor calls per IPV4 connections.	16384	no
ipv6 connection table size	Number of elements stored inside hash tables used to monitor calls per IPV6 connections.	16384	no
udp connection table size	Number of temporary elements stored inside hash tables used to monitor UDP connections.	4096	no
ebpf type format	Define the file type to load an eBPF program. Three options are available: legacy (Attach only kprobe), co-re (Plugin tries to use trampoline when available), and auto (plugin check OS configuration before to load).	auto	no
ebpf co-re tracing	Select the attach method used by plugin when co-re is defined in previous option. Two options are available: trampoline (Option with lowest overhead), and probe (the same of legacy code).	trampoline	no
maps per core	Define how plugin will load their hash maps. When enabled (yes) plugin will load one hash table per core, instead to have centralized information.	yes	no
lifetime	Set default lifetime for thread when enabled by cloud.	300	no

via File

The configuration file name for this integration is ebpf.d/network.conf.

The file format is a modified INI syntax. The general structure is:

[section1]
    option1 = some value
    option2 = some other value

[section2]
    option3 = some third value

You can edit the configuration file using the edit-config script from the Netdata config directory.

cd /etc/netdata 2>/dev/null || cd /opt/netdata/etc/netdata
sudo ./edit-config ebpf.d/network.conf

Examples

There are no configuration examples.

Alerts

There are no alerts configured by default for this integration.

Metrics

Metrics grouped by scope.

The scope defines the instance that the metric belongs to. An instance is uniquely identified by a set of labels.

Per eBPF Socket instance

These metrics show total number of calls to functions inside kernel.

This scope has no labels.

Metrics:

Metric	Description	Dimensions	Unit
ip.inbound_conn	Inbound connections.	connected_tcp, connected_udp	connections/s
ip.tcp_outbound_conn	TCP outbound connections.	received	connections/s
ip.tcp_functions	Calls to internal functions	received, send, closed	calls/s
ip.total_tcp_bandwidth	TCP bandwidth	received, send	kilobits/s
ip.tcp_error	TCP errors	received, send	calls/s
ip.tcp_retransmit	Packages retransmitted	retransmitted	calls/s
ip.udp_functions	UDP calls	received, send	calls/s
ip.total_udp_bandwidth	UDP bandwidth	received, send	kilobits/s
ip.udp_error	UDP errors	received, send	calls/s

Per apps

These metrics show grouped information per apps group.

Labels:

Label	Description
app_group	The name of the group defined in the configuration.

Metrics:

Metric	Description	Dimensions	Unit
app.ebpf_call_tcp_v4_connection	Calls to tcp_v4_connection	connections	connections/s
app.ebpf_call_tcp_v6_connection	Calls to tcp_v6_connection	connections	connections/s
app.ebpf_sock_total_bandwidth	Bytes sent	received, sent	kilobits/s
app.ebpf_call_tcp_sendmsg	Calls for tcp_sendmsg	calls	calls/s
app.ebpf_call_tcp_cleanup_rbuf	Calls for tcp_cleanup_rbuf	calls	calls/s
app.ebpf_call_tcp_retransmit	Calls for tcp_retransmit	calls	calls/s
app.ebpf_call_udp_sendmsg	Calls for udp_sendmsg	calls	calls/s
app.ebpf_call_udp_recvmsg	Calls for udp_recvmsg	calls	calls/s

Per cgroup

This scope has no labels.

Metrics:

Metric	Description	Dimensions	Unit
cgroup.net_conn_ipv4	Calls to tcp_v4_connection	connections	connections/s
cgroup.net_conn_ipv6	Calls to tcp_v6_connection	connections	connections/s
cgroup.net_total_bandwidth	Bytes received	received, sent	kilobits/s
cgroup.net_tcp_recv	Calls to tcp_cleanup_rbuf.	calls	calls/s
cgroup.net_tcp_send	Calls to tcp_sendmsg.	calls	calls/s
cgroup.net_retransmit	Calls to tcp_retransmit.	calls	calls/s
cgroup.net_udp_send	Calls to udp_sendmsg	calls	calls/s
cgroup.net_udp_recv	Calls to udp_recvmsg	calls	calls/s
services.net_conn_ipv4	Calls to tcp_v4_connection	connections	connections/s
services.net_conn_ipv6	Calls to tcp_v6_connection	connections	connections/s
services.net_total_bandwidth	Bytes received	received, sent	kilobits/s
services.net_tcp_recv	Calls to tcp_cleanup_rbuf.	calls	calls/s
services.net_tcp_send	Calls to tcp_sendmsg.	calls	calls/s
services.net_tcp_retransmit	Calls to tcp_retransmit	calls	calls/s
services.net_udp_send	Calls to udp_sendmsg	calls	calls/s
services.net_udp_recv	Calls to udp_recvmsg	calls	calls/s