2 unstable releases
Uses old Rust 2015
0.2.0 | Jul 3, 2018 |
---|---|
0.1.0 | May 29, 2018 |
#69 in #cloud-native
32KB
601 lines
Overview
cniguru
is a tool that can be used to troubleshoot containers networking.
It provides information about node interfaces used by docker and kubernetes containers:
- the name, IP, MAC address and MTU of the interfaces used by containers
- details about the veth pair (the host/node side of a container interface)
- the host/node bridge the interfaces are connected to
License
Licensed under either of
- Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
- MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)
at your option.
Examples
- List the interfaces for a kubernetes pod in a human readable format:
[root@kh1 ~]# KUBECONFIG=/etc/kubernetes/admin.conf kubectl get pod
NAME READY STATUS RESTARTS AGE
netshoot-57c7994b66-zxdsl 1/1 Running 0 2m
serve-hostname-86bc9d96dc-n7n6h 1/1 Running 0 7d
[root@kh1 ~]#
[root@kh1 ~]# cniguru pod netshoot-57c7994b66-zxdsl
CONTAINER_ID PID NODE INTF(C) MAC_ADDRESS(C) IP_ADDRESS(C) INTF(N) BRIDGE(N)
3e08cafbb6eb 26393 kh1 eth0 0a:58:0a:f4:00:de 10.244.0.222/24 veth0c97cb60 cni0
3e08cafbb6eb 26393 kh1 net0 0a:58:0a:08:08:06 10.8.8.6/24 veth74689fd2 br_dc_test
- Present the output in JSON format:
[root@kh1 ~]# cniguru pod netshoot-57c7994b66-zxdsl -o json
[
{
"container": {
"id": "3e08cafbb6eb01558e86ba53f170b62855f0bf5a328a77dc2da278061ff7fdc8",
"pid": 26393,
"node_name": "kh1",
"runtime": "Docker"
},
"interfaces": [
{
"container": {
"name": "eth0",
"ifindex": 3,
"peer_ifindex": 558,
"mtu": 1460,
"mac_address": "0a:58:0a:f4:00:de",
"bridge": null,
"ip_address": "10.244.0.222/24"
},
"node": {
"name": "veth0c97cb60",
"ifindex": 558,
"peer_ifindex": 3,
"mtu": 1460,
"mac_address": "0a:20:94:a0:35:64",
"bridge": "cni0",
"ip_address": null
}
},
{
"container": {
"name": "net0",
"ifindex": 5,
"peer_ifindex": 559,
"mtu": 1500,
"mac_address": "0a:58:0a:08:08:06",
"bridge": null,
"ip_address": "10.8.8.6/24"
},
"node": {
"name": "veth74689fd2",
"ifindex": 559,
"peer_ifindex": 5,
"mtu": 1500,
"mac_address": "d2:ae:0b:9f:62:72",
"bridge": "br_dc_test",
"ip_address": null
}
}
]
}
]
Installation
Cargo
If you have a rust toolchain setup you can install cniguru
via cargo:
cargo install cniguru
Build from sources
- Make sure you have a newer Rust compiler installed. Run
rustup override set stable
rustup update stable
- Clone the source code:
git clone https://github.com/maximih/cniguru
cd cniguru
- Build
cniguru
cargo build --release
Download x86_64
binary
A statically linked binary for linux x86_64
is provided here
Configuration
The path to the Kubernetes config can be set via $KUBECONFIG
env variable.
If $KUBECONFIG
is not set, cniguru
will try to use $HOME/.kube/config
or /etc/kubernetes/admin.conf
.
Docker related info is fetched using docker
cli so cniguru
must be run with an user that has rights to execute docker commands.
Future plans
Some features that might be added in the future:
- run
cniguru
as a kubernetesdaemonset
(server side) and access it via a REST API (client side) - add possibility to trace packets on different interfaces and different nodes
- add possibility to enable packet logging
Dependencies
~25–37MB
~656K SLoC