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***********
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LaTeX2e <2024-11-01>
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***********
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</usr/share/texmf/fonts/type1/public/lm/lmbx12.pfb></usr/share/texmf/fonts/ty
|
||||
pe1/public/lm/lmr12.pfb></usr/share/texmf/fonts/type1/public/lm/lmr17.pfb></usr
|
||||
/share/texmf/fonts/type1/public/lm/lmr6.pfb></usr/share/texmf/fonts/type1/publi
|
||||
c/lm/lmtk10.pfb></usr/share/texmf/fonts/type1/public/lm/lmtt10.pfb></usr/share/
|
||||
texmf/fonts/type1/public/lm/lmtt12.pfb>
|
||||
Output written on main.pdf (4 pages, 199974 bytes).
|
||||
PDF statistics:
|
||||
57 PDF objects out of 1000 (max. 8388607)
|
||||
35 compressed objects within 1 object stream
|
||||
0 named destinations out of 1000 (max. 500000)
|
||||
1 words of extra memory for PDF output out of 10000 (max. 10000000)
|
||||
|
||||
250
doc/main.md
Normal file
250
doc/main.md
Normal file
@ -0,0 +1,250 @@
|
||||
---
|
||||
title: Basic Configuration of dnsmasq in an Incus Container on Debian
|
||||
with Netplan
|
||||
---
|
||||
|
||||
# Introduction
|
||||
|
||||
This guide provides step-by-step instructions for setting up `dnsmasq`
|
||||
as a DNS and DHCP server in an Incus container running Debian. The
|
||||
network configuration is managed using Netplan to ensure proper network
|
||||
integration.
|
||||
|
||||
# Prerequisites
|
||||
|
||||
Before proceeding, ensure the following:
|
||||
|
||||
- Incus is installed on the host system (`sudo apt install incus`).
|
||||
|
||||
- A Debian-based container is created in Incus.
|
||||
|
||||
- Basic knowledge of Linux networking and container management.
|
||||
|
||||
- Root or sudo access to the host and container.
|
||||
|
||||
# Step-by-Step Configuration
|
||||
|
||||
## Creating and Setting Up the Incus Container
|
||||
|
||||
Create a Debian container named `dnsmasq-container` using the following
|
||||
commands on the host:
|
||||
|
||||
``` {.bash language="bash"}
|
||||
incus create images:debian/12 dnsmasq-container
|
||||
incus config set dnsmasq-container security.syscalls.intercept.mount true
|
||||
incus config set dnsmasq-container security.nesting true
|
||||
incus config set dnsmasq-container security.privileged true
|
||||
incus start dnsmasq-container
|
||||
```
|
||||
|
||||
The `security.syscalls.intercept.mount`, `security.nesting`, and
|
||||
`security.privileged` settings are required for `dnsmasq` and Docker to
|
||||
function correctly in the container.
|
||||
|
||||
## Firewall Configuration
|
||||
|
||||
To allow traffic forwarding between the `incusbr0` bridge and the `wlo1`
|
||||
wireless interface, the following iptables rules are applied:
|
||||
|
||||
sudo iptables -A FORWARD -i incusbr0 -o wlo1 -j ACCEPT
|
||||
sudo iptables -A FORWARD -i wlo1 -o incusbr0 -m state --state RELATED,ESTABLISHED -j ACCEPT
|
||||
|
||||
## Installing Additional Packages
|
||||
|
||||
Install the necessary packages inside the container:
|
||||
|
||||
``` {.bash language="bash"}
|
||||
incus exec dnsmasq-container -- apt update
|
||||
incus exec dnsmasq-container -- apt install -y \
|
||||
netplan.io \
|
||||
sudo vim nano git tmux mc zip unzip curl wget htop lynx \
|
||||
iproute2 termshark bridge-utils \
|
||||
python3 python3-ipython python3-pyroute2 python3-scapy \
|
||||
docker.io docker-compose
|
||||
```
|
||||
|
||||
## Configuring Users and Permissions
|
||||
|
||||
Configure user access and permissions within the container.
|
||||
|
||||
### Changing the Root Password
|
||||
|
||||
Set the root password to \"passroot\":
|
||||
|
||||
``` {.bash language="bash"}
|
||||
incus exec dnsmasq-container -- bash -c 'echo "root:passroot" | chpasswd'
|
||||
```
|
||||
|
||||
### Adding a New User
|
||||
|
||||
Add a new user named \"user\" with the password \"pass\" and add them to
|
||||
the \"sudo\" and \"docker\" groups:
|
||||
|
||||
``` {.bash language="bash"}
|
||||
sudo useradd -m -s /bin/bash -G sudo user && echo 'user:pass' | sudo chpasswd
|
||||
```
|
||||
|
||||
## Accessing the Container
|
||||
|
||||
Access the container's shell:
|
||||
|
||||
``` {.bash language="bash"}
|
||||
incus exec dnsmasq-container -- su - user
|
||||
```
|
||||
|
||||
# Setting Up a Veth Pair Between Container and Network Namespace
|
||||
|
||||
To enable direct communication between a container and a network
|
||||
namespace, a virtual Ethernet (`veth`) pair is created. The following
|
||||
Python script (`link.py`) is used to create a `veth` pair between the
|
||||
`dnsmasq-container` (an Incus container) and the `ns1` network
|
||||
namespace, with interfaces named `vA` and `vB`.
|
||||
|
||||
sudo python3 link.py -n1 vA -t2 incus -ns2 dnsmasq-container -n2 vB
|
||||
|
||||
This command:
|
||||
|
||||
- Creates a `veth` pair with one end (`vA`) in the default namespace
|
||||
and the other end (`vB`) in the `dnsmasq-container`'s network
|
||||
namespace.
|
||||
|
||||
- Ensures the interfaces are set up and operational, allowing network
|
||||
traffic to flow between the container and the `ns1` namespace (or
|
||||
default namespace if `ns1` is not explicitly created).
|
||||
|
||||
The script uses the `pyroute2` library to manage network interfaces and
|
||||
namespaces, and supports container types such as Incus, LXC, LXD, and
|
||||
Docker. Ensure the `dnsmasq-container` is running in Incus before
|
||||
executing the command.
|
||||
|
||||
## Configuring the Network with Netplan
|
||||
|
||||
Configure the container's network using Netplan to assign a static IP
|
||||
address. Create or edit the Netplan configuration file at
|
||||
`/etc/netplan/01-netcfg.yaml`:
|
||||
|
||||
``` {.bash language="bash"}
|
||||
incus exec dnsmasq-container -- nano /etc/netplan/01-netcfg.yaml
|
||||
```
|
||||
|
||||
Add the following configuration:
|
||||
|
||||
``` {.yaml language="yaml"}
|
||||
network:
|
||||
version: 2
|
||||
ethernets:
|
||||
vB:
|
||||
dhcp4: no
|
||||
addresses:
|
||||
- 192.168.1.10/24
|
||||
routes:
|
||||
- to: default
|
||||
via: 192.168.1.1
|
||||
nameservers:
|
||||
addresses: [8.8.8.8, 8.8.4.4]
|
||||
```
|
||||
|
||||
Apply the configuration:
|
||||
|
||||
``` {.bash language="bash"}
|
||||
incus exec dnsmasq-container -- netplan apply
|
||||
```
|
||||
|
||||
## Installing dnsmasq
|
||||
|
||||
Update the package list and install `dnsmasq`:
|
||||
|
||||
``` {.bash language="bash"}
|
||||
incus exec dnsmasq-container -- apt update
|
||||
incus exec dnsmasq-container -- apt install dnsmasq -y
|
||||
```
|
||||
|
||||
## Configuring dnsmasq
|
||||
|
||||
Edit the `dnsmasq` configuration file at `/etc/dnsmasq.conf`:
|
||||
|
||||
``` {.bash language="bash"}
|
||||
incus exec dnsmasq-container -- nano /etc/dnsmasq.conf
|
||||
```
|
||||
|
||||
Add or modify the following settings to enable DNS and DHCP:
|
||||
|
||||
# DNS settings
|
||||
domain-needed
|
||||
bogus-priv
|
||||
no-resolv
|
||||
server=8.8.8.8
|
||||
server=8.8.4.4
|
||||
local=/example.local/
|
||||
domain=example.local
|
||||
|
||||
# DHCP settings
|
||||
dhcp-range=192.168.1.100,192.168.1.200,12h
|
||||
dhcp-option=3,192.168.1.1
|
||||
dhcp-option=6,8.8.8.8,8.8.4.4
|
||||
|
||||
**Explanation:**
|
||||
|
||||
- `domain-needed`: Prevents incomplete domain names from being sent to
|
||||
upstream DNS.
|
||||
|
||||
- `bogus-priv`: Blocks reverse DNS lookups for private IP ranges.
|
||||
|
||||
- `no-resolv`: Disables reading `/etc/resolv.conf`.
|
||||
|
||||
- `server`: Specifies upstream DNS servers (Google DNS in this case).
|
||||
|
||||
- `local` and `domain`: Configures a local domain.
|
||||
|
||||
- `dhcp-range`: Defines the IP range for DHCP clients (from
|
||||
192.168.1.100 to 192.168.1.200, lease time 12 hours).
|
||||
|
||||
- `dhcp-option`: Sets the default gateway (option 3) and DNS servers
|
||||
(option 6).
|
||||
|
||||
## Starting and Enabling dnsmasq
|
||||
|
||||
Restart and enable the `dnsmasq` service:
|
||||
|
||||
``` {.bash language="bash"}
|
||||
incus exec dnsmasq-container -- systemctl restart dnsmasq
|
||||
incus exec dnsmasq-container -- systemctl enable dnsmasq
|
||||
```
|
||||
|
||||
Verify that `dnsmasq` is running:
|
||||
|
||||
``` {.bash language="bash"}
|
||||
incus exec dnsmasq-container -- systemctl status dnsmasq
|
||||
```
|
||||
|
||||
## Testing the Configuration
|
||||
|
||||
Test DNS resolution from within the container:
|
||||
|
||||
``` {.bash language="bash"}
|
||||
incus exec dnsmasq-container -- nslookup example.local 192.168.1.10
|
||||
```
|
||||
|
||||
To test DHCP, connect a client device to the same network and verify
|
||||
that it receives an IP address in the range
|
||||
`192.168.1.100–192.168.1.200`.
|
||||
|
||||
# Troubleshooting
|
||||
|
||||
If `dnsmasq` fails to start:
|
||||
|
||||
- Check the logs:
|
||||
`incus exec dnsmasq-container – journalctl -u dnsmasq`.
|
||||
|
||||
- Ensure no other service is using port 53 (DNS) or 67 (DHCP).
|
||||
|
||||
- Verify the network configuration with
|
||||
`incus exec dnsmasq-container – ip a` and
|
||||
`incus exec dnsmasq-container – ping 8.8.8.8`.
|
||||
|
||||
# Conclusion
|
||||
|
||||
This guide configures `dnsmasq` as a DNS and DHCP server in an Incus
|
||||
container on Debian. The Netplan configuration ensures proper network
|
||||
setup. For advanced configurations, refer to the `dnsmasq` documentation
|
||||
(`man dnsmasq`).
|
||||
BIN
doc/main.pdf
BIN
doc/main.pdf
Binary file not shown.
49
doc/main.tex
49
doc/main.tex
@ -64,6 +64,16 @@ incus start dnsmasq-container
|
||||
\end{lstlisting}
|
||||
The \texttt{security.syscalls.intercept.mount}, \texttt{security.nesting}, and \texttt{security.privileged} settings are required for \texttt{dnsmasq} and Docker to function correctly in the container.
|
||||
|
||||
|
||||
% New subsection for firewall settings
|
||||
\subsection{Firewall Configuration}
|
||||
To allow traffic forwarding between the \texttt{incusbr0} bridge and the \texttt{wlo1} wireless interface, the following iptables rules are applied:
|
||||
|
||||
\begin{lstlisting}
|
||||
sudo iptables -A FORWARD -i incusbr0 -o wlo1 -j ACCEPT
|
||||
sudo iptables -A FORWARD -i wlo1 -o incusbr0 -m state --state RELATED,ESTABLISHED -j ACCEPT
|
||||
\end{lstlisting}
|
||||
|
||||
\subsection{Installing Additional Packages}
|
||||
Install the necessary packages inside the container:
|
||||
\begin{lstlisting}[language=bash]
|
||||
@ -88,25 +98,31 @@ incus exec dnsmasq-container -- bash -c 'echo "root:passroot" | chpasswd'
|
||||
\subsubsection{Adding a New User}
|
||||
Add a new user named "user" with the password "pass" and add them to the "sudo" and "docker" groups:
|
||||
\begin{lstlisting}[language=bash]
|
||||
incus exec dnsmasq-container -- useradd -m -s /bin/bash user
|
||||
incus exec dnsmasq-container -- bash -c 'echo "user:pass" | chpasswd'
|
||||
incus exec dnsmasq-container -- usermod -aG sudo user
|
||||
incus exec dnsmasq-container -- usermod -aG docker user
|
||||
sudo useradd -m -s /bin/bash -G sudo user && echo 'user:pass' | sudo chpasswd
|
||||
\end{lstlisting}
|
||||
|
||||
\subsection{Accessing the Container}
|
||||
Access the container's shell:
|
||||
\begin{lstlisting}[language=bash]
|
||||
incus exec dnsmasq-container -- bash
|
||||
incus exec dnsmasq-container -- su - user
|
||||
\end{lstlisting}
|
||||
|
||||
\subsection{Installing dnsmasq}
|
||||
Update the package list and install \texttt{dnsmasq}:
|
||||
\begin{lstlisting}[language=bash]
|
||||
incus exec dnsmasq-container -- apt update
|
||||
incus exec dnsmasq-container -- apt install dnsmasq -y
|
||||
% New section for veth pair setup
|
||||
\section{Setting Up a Veth Pair Between Container and Network Namespace}
|
||||
To enable direct communication between a container and a network namespace, a virtual Ethernet (\texttt{veth}) pair is created. The following Python script (\texttt{link.py}) is used to create a \texttt{veth} pair between the \texttt{dnsmasq-container} (an Incus container) and the \texttt{ns1} network namespace, with interfaces named \texttt{vA} and \texttt{vB}.
|
||||
|
||||
\begin{lstlisting}
|
||||
sudo python3 link.py -n1 vA -t2 incus -ns2 dnsmasq-container -n2 vB
|
||||
\end{lstlisting}
|
||||
|
||||
This command:
|
||||
\begin{itemize}
|
||||
\item Creates a \texttt{veth} pair with one end (\texttt{vA}) in the default namespace and the other end (\texttt{vB}) in the \texttt{dnsmasq-container}'s network namespace.
|
||||
\item Ensures the interfaces are set up and operational, allowing network traffic to flow between the container and the \texttt{ns1} namespace (or default namespace if \texttt{ns1} is not explicitly created).
|
||||
\end{itemize}
|
||||
|
||||
The script uses the \texttt{pyroute2} library to manage network interfaces and namespaces, and supports container types such as Incus, LXC, LXD, and Docker. Ensure the \texttt{dnsmasq-container} is running in Incus before executing the command.
|
||||
|
||||
\subsection{Configuring the Network with Netplan}
|
||||
Configure the container's network using Netplan to assign a static IP address. Create or edit the Netplan configuration file at \texttt{/etc/netplan/01-netcfg.yaml}:
|
||||
\begin{lstlisting}[language=bash]
|
||||
@ -117,7 +133,7 @@ Add the following configuration:
|
||||
network:
|
||||
version: 2
|
||||
ethernets:
|
||||
eth0:
|
||||
vB:
|
||||
dhcp4: no
|
||||
addresses:
|
||||
- 192.168.1.10/24
|
||||
@ -132,6 +148,15 @@ Apply the configuration:
|
||||
incus exec dnsmasq-container -- netplan apply
|
||||
\end{lstlisting}
|
||||
|
||||
|
||||
\subsection{Installing dnsmasq}
|
||||
Update the package list and install \texttt{dnsmasq}:
|
||||
\begin{lstlisting}[language=bash]
|
||||
incus exec dnsmasq-container -- apt update
|
||||
incus exec dnsmasq-container -- apt install dnsmasq -y
|
||||
\end{lstlisting}
|
||||
|
||||
|
||||
\subsection{Configuring dnsmasq}
|
||||
Edit the \texttt{dnsmasq} configuration file at \texttt{/etc/dnsmasq.conf}:
|
||||
\begin{lstlisting}[language=bash]
|
||||
@ -194,4 +219,4 @@ If \texttt{dnsmasq} fails to start:
|
||||
\section{Conclusion}
|
||||
This guide configures \texttt{dnsmasq} as a DNS and DHCP server in an Incus container on Debian. The Netplan configuration ensures proper network setup. For advanced configurations, refer to the \texttt{dnsmasq} documentation (\texttt{man dnsmasq}).
|
||||
|
||||
\end{document}
|
||||
\end{document}
|
||||
|
||||
430
py/link.py
Normal file
430
py/link.py
Normal file
@ -0,0 +1,430 @@
|
||||
import argparse
|
||||
import os
|
||||
import subprocess
|
||||
import sys
|
||||
from pyroute2 import IPRoute, NetNS
|
||||
|
||||
class NetworkNamespaceManager:
|
||||
"""
|
||||
Provides functionalities to manage network namespaces.
|
||||
|
||||
Network namespaces partition network resources such as network links,
|
||||
IP addresses, and port numbers into disjoint sets.
|
||||
"""
|
||||
|
||||
@staticmethod
|
||||
def list_netns():
|
||||
"""
|
||||
List all available network namespaces.
|
||||
|
||||
Scans the '/var/run/netns' directory and prints out all
|
||||
the network namespace files present. If no namespaces are found, it
|
||||
prints a message indicating that.
|
||||
"""
|
||||
netns_dir = "/var/run/netns"
|
||||
try:
|
||||
netns_files = os.listdir(netns_dir)
|
||||
if netns_files:
|
||||
print("List of available network namespaces:")
|
||||
for netns_file in netns_files:
|
||||
print(f"- {netns_file}")
|
||||
else:
|
||||
print("No network namespaces found.")
|
||||
except OSError as e:
|
||||
print(f"Error listing network namespaces: {e}")
|
||||
|
||||
class ContainerNetnsExposer:
|
||||
"""
|
||||
Responsible for exposing network namespaces of containers.
|
||||
|
||||
Supports Docker, LXC, LXD, and Incus containers, allowing the user to interact
|
||||
with their network namespaces.
|
||||
"""
|
||||
|
||||
def __init__(self):
|
||||
"""
|
||||
Initializes the ContainerNetnsExposer instance.
|
||||
"""
|
||||
self.netns_pid = None
|
||||
self.netns_path = None
|
||||
|
||||
def expose_container_netns(self, container_id_or_name, container_type='docker'):
|
||||
"""
|
||||
Expose the network namespace of a specified container.
|
||||
|
||||
Parameters:
|
||||
container_id_or_name (str): The identifier or name of the container.
|
||||
container_type (str): The type of the container ('docker', 'lxc', 'lxd', or 'incus').
|
||||
|
||||
Returns:
|
||||
str: The PID of the container as a string.
|
||||
|
||||
Raises:
|
||||
SystemExit: If the container type is unsupported or if there is an error
|
||||
in retrieving the container's PID.
|
||||
"""
|
||||
if container_type == 'docker':
|
||||
self.get_docker_container_pid(container_id_or_name)
|
||||
elif container_type in ('lxc', 'lxd', 'incus'):
|
||||
self.get_lxc_container_pid(container_id_or_name, container_type)
|
||||
else:
|
||||
print("Unsupported container type. Only 'docker', 'lxc', 'lxd', and 'incus' are supported.")
|
||||
sys.exit(1)
|
||||
|
||||
self.create_netns_directory()
|
||||
self.create_or_remove_netns_symlink()
|
||||
return str(self.netns_pid)
|
||||
|
||||
def get_docker_container_pid(self, container_id_or_name):
|
||||
"""
|
||||
Retrieve the PID of a Docker container.
|
||||
|
||||
Parameters:
|
||||
container_id_or_name (str): The identifier or name of the Docker container.
|
||||
|
||||
Raises:
|
||||
SystemExit: If there is an error in retrieving the Docker container's PID.
|
||||
"""
|
||||
try:
|
||||
self.netns_pid = subprocess.check_output(
|
||||
["sudo", "docker", "inspect", "-f", "{{.State.Pid}}", container_id_or_name],
|
||||
universal_newlines=True
|
||||
).strip()
|
||||
except subprocess.CalledProcessError:
|
||||
print("Error retrieving Docker container PID. Make sure the container exists and is running.")
|
||||
sys.exit(1)
|
||||
|
||||
def get_lxc_container_pid(self, container_name, container_type='lxc'):
|
||||
"""
|
||||
Retrieve the PID of an LXC, LXD, or Incus container.
|
||||
|
||||
Parameters:
|
||||
container_name (str): The name of the container.
|
||||
container_type (str): The type of the container ('lxc', 'lxd', or 'incus').
|
||||
|
||||
Raises:
|
||||
SystemExit: If there is an error in retrieving the container's PID.
|
||||
"""
|
||||
try:
|
||||
if container_type == 'lxc':
|
||||
output = subprocess.check_output(
|
||||
["lxc-info", "-n", container_name, "-p"],
|
||||
universal_newlines=True
|
||||
)
|
||||
self.netns_pid = output.strip().split()[-1]
|
||||
elif container_type == 'lxd':
|
||||
output = subprocess.check_output(
|
||||
["sudo", "lxc", "info", container_name],
|
||||
universal_newlines=True
|
||||
)
|
||||
for line in output.splitlines():
|
||||
if line.strip().startswith("PID:"):
|
||||
self.netns_pid = line.split(':')[1].strip()
|
||||
break
|
||||
else:
|
||||
print(f"PID not found in 'lxc info' output for container '{container_name}'.")
|
||||
sys.exit(1)
|
||||
elif container_type == 'incus':
|
||||
output = subprocess.check_output(
|
||||
["sudo", "incus", "info", container_name],
|
||||
universal_newlines=True
|
||||
)
|
||||
for line in output.splitlines():
|
||||
if line.strip().startswith("PID:"):
|
||||
self.netns_pid = line.split(':')[1].strip()
|
||||
break
|
||||
else:
|
||||
print(f"PID not found in 'incus info' output for container '{container_name}'.")
|
||||
sys.exit(1)
|
||||
except subprocess.CalledProcessError as e:
|
||||
print(f"Error retrieving {container_type.upper()} container PID for '{container_name}'. Error: {e}")
|
||||
sys.exit(1)
|
||||
|
||||
def create_netns_directory(self):
|
||||
"""
|
||||
Create the network namespace directory if it does not exist.
|
||||
|
||||
Ensures that the directory '/var/run/netns' exists, which is used
|
||||
to store network namespace symlinks.
|
||||
"""
|
||||
try:
|
||||
subprocess.run(["sudo", "mkdir", "-p", "/var/run/netns"], check=True)
|
||||
except subprocess.CalledProcessError as e:
|
||||
print(f"Error creating network namespace directory: {e.stderr.strip()}")
|
||||
sys.exit(1)
|
||||
|
||||
def create_or_remove_netns_symlink(self):
|
||||
"""
|
||||
Create or remove a symlink to the network namespace of a container.
|
||||
|
||||
Sets up a symlink in '/var/run/netns', pointing to the network namespace
|
||||
of the container identified by its PID. If a symlink with the same name
|
||||
already exists, it is removed before creating a new one.
|
||||
"""
|
||||
self.netns_path = f"/var/run/netns/{self.netns_pid}"
|
||||
|
||||
try:
|
||||
if os.path.exists(self.netns_path):
|
||||
subprocess.run(["sudo", "rm", "-rf", self.netns_path], check=True)
|
||||
subprocess.run(["sudo", "ln", "-s", f"/proc/{self.netns_pid}/ns/net", self.netns_path], check=True)
|
||||
except subprocess.CalledProcessError as e:
|
||||
print(f"Error creating or removing symlink: {e}")
|
||||
sys.exit(1)
|
||||
|
||||
class IfaceManager:
|
||||
"""
|
||||
Manages network interfaces, including creation, deletion, and configuration
|
||||
of veth pairs, VLANs, and bridges.
|
||||
"""
|
||||
|
||||
def delete(self, iface_name, namespace=None):
|
||||
"""
|
||||
Delete a network interface.
|
||||
|
||||
Parameters:
|
||||
iface_name (str): The name of the interface to delete.
|
||||
namespace (str, optional): The network namespace where the interface exists.
|
||||
|
||||
Raises:
|
||||
Exception: If the interface cannot be deleted.
|
||||
"""
|
||||
try:
|
||||
if namespace:
|
||||
context_manager = NetNS(namespace)
|
||||
else:
|
||||
context_manager = IPRoute()
|
||||
|
||||
with context_manager as ns:
|
||||
iface_idx_list = ns.link_lookup(ifname=iface_name)
|
||||
if not iface_idx_list:
|
||||
raise ValueError(f"Interface {iface_name} not found.")
|
||||
iface_idx = iface_idx_list[0]
|
||||
ns.link('del', index=iface_idx)
|
||||
except Exception as e:
|
||||
print(f"Error deleting interface {iface_name} in namespace {namespace}: {e}")
|
||||
|
||||
def create_veth(self, iface1, iface2, namespace=None):
|
||||
"""
|
||||
Create a veth pair.
|
||||
|
||||
Parameters:
|
||||
iface1 (str): The name of the first interface.
|
||||
iface2 (str): The name of the second interface.
|
||||
namespace (str, optional): The network namespace where to create the veth pair.
|
||||
|
||||
Raises:
|
||||
Exception: If the veth pair cannot be created.
|
||||
"""
|
||||
try:
|
||||
if namespace:
|
||||
context_manager = NetNS(namespace)
|
||||
else:
|
||||
context_manager = IPRoute()
|
||||
|
||||
with context_manager as ns:
|
||||
ns.link('add', ifname=iface1, peer={'ifname': iface2}, kind='veth')
|
||||
except Exception as e:
|
||||
print(f"Error creating veth pair {iface1} and {iface2}: {e}")
|
||||
|
||||
def create_vlan(self, base_iface, vlan_id, namespace=None):
|
||||
"""
|
||||
Create a VLAN interface.
|
||||
|
||||
Parameters:
|
||||
base_iface (str): The base interface name.
|
||||
vlan_id (int): The VLAN ID.
|
||||
namespace (str, optional): The network namespace where to create the VLAN interface.
|
||||
|
||||
Raises:
|
||||
Exception: If the VLAN interface cannot be created.
|
||||
"""
|
||||
try:
|
||||
if namespace:
|
||||
context_manager = NetNS(namespace)
|
||||
else:
|
||||
context_manager = IPRoute()
|
||||
|
||||
with context_manager as ns:
|
||||
base_iface_idx_list = ns.link_lookup(ifname=base_iface)
|
||||
if not base_iface_idx_list:
|
||||
raise ValueError(f"Base interface {base_iface} not found.")
|
||||
base_iface_idx = base_iface_idx_list[0]
|
||||
|
||||
vlan_iface = f"{base_iface}.{vlan_id}"
|
||||
ns.link('add', ifname=vlan_iface, link=base_iface_idx, kind='vlan', vlan_info={'id': vlan_id})
|
||||
except Exception as e:
|
||||
print(f"Error creating VLAN on interface {base_iface}: {e}")
|
||||
|
||||
def create_bridge(self, bridge_name, namespace=None):
|
||||
"""
|
||||
Create a bridge interface.
|
||||
|
||||
Parameters:
|
||||
bridge_name (str): The name of the bridge.
|
||||
namespace (str, optional): The network namespace where to create the bridge.
|
||||
|
||||
Raises:
|
||||
Exception: If the bridge cannot be created.
|
||||
"""
|
||||
try:
|
||||
if namespace:
|
||||
context_manager = NetNS(namespace)
|
||||
else:
|
||||
context_manager = IPRoute()
|
||||
|
||||
with context_manager as ns:
|
||||
ns.link('add', ifname=bridge_name, kind='bridge')
|
||||
except Exception as e:
|
||||
print(f"Error creating bridge {bridge_name}: {e}")
|
||||
|
||||
def move(self, iface, namespace):
|
||||
"""
|
||||
Move a network interface to another namespace.
|
||||
|
||||
Parameters:
|
||||
iface (str): The interface name to move.
|
||||
namespace (str): The target network namespace.
|
||||
|
||||
Raises:
|
||||
Exception: If the interface cannot be moved.
|
||||
"""
|
||||
try:
|
||||
ipr = IPRoute()
|
||||
idx_list = ipr.link_lookup(ifname=iface)
|
||||
if not idx_list:
|
||||
raise ValueError(f"Interface {iface} not found.")
|
||||
idx = idx_list[0]
|
||||
ipr.link('set', index=idx, net_ns_fd=namespace)
|
||||
except Exception as e:
|
||||
print(f"Error moving interface {iface} to namespace {namespace}: {e}")
|
||||
|
||||
def set_interface_up(self, iface_name, namespace=None):
|
||||
"""
|
||||
Set a network interface up.
|
||||
|
||||
Parameters:
|
||||
iface_name (str): The name of the interface.
|
||||
namespace (str, optional): The network namespace where the interface exists.
|
||||
|
||||
Raises:
|
||||
Exception: If the interface cannot be set up.
|
||||
"""
|
||||
try:
|
||||
if namespace:
|
||||
context_manager = NetNS(namespace)
|
||||
else:
|
||||
context_manager = IPRoute()
|
||||
|
||||
with context_manager as ns:
|
||||
iface_idx_list = ns.link_lookup(ifname=iface_name)
|
||||
if not iface_idx_list:
|
||||
raise ValueError(f"Interface {iface_name} not found.")
|
||||
iface_idx = iface_idx_list[0]
|
||||
ns.link("set", index=iface_idx, state="up")
|
||||
except Exception as e:
|
||||
print(f"Error setting up interface {iface_name} in namespace {namespace}: {e}")
|
||||
|
||||
def attach_to_bridge(self, iface_name, bridge_name, namespace=None):
|
||||
"""
|
||||
Attach an interface to a bridge.
|
||||
|
||||
Parameters:
|
||||
iface_name (str): The name of the interface.
|
||||
bridge_name (str): The name of the bridge.
|
||||
namespace (str, optional): The network namespace where the interface and bridge exist.
|
||||
|
||||
Raises:
|
||||
Exception: If the interface cannot be attached to the bridge.
|
||||
"""
|
||||
try:
|
||||
if namespace:
|
||||
context_manager = NetNS(namespace)
|
||||
else:
|
||||
context_manager = IPRoute()
|
||||
|
||||
with context_manager as ns:
|
||||
iface_idx_list = ns.link_lookup(ifname=iface_name)
|
||||
if not iface_idx_list:
|
||||
raise ValueError(f"Interface {iface_name} not found.")
|
||||
iface_idx = iface_idx_list[0]
|
||||
|
||||
bridge_idx_list = ns.link_lookup(ifname=bridge_name)
|
||||
if not bridge_idx_list:
|
||||
raise ValueError(f"Bridge {bridge_name} not found.")
|
||||
bridge_idx = bridge_idx_list[0]
|
||||
|
||||
ns.link("set", index=iface_idx, master=bridge_idx)
|
||||
except Exception as e:
|
||||
print(f"Error attaching interface {iface_name} to bridge {bridge_name} in namespace {namespace}: {e}")
|
||||
|
||||
def interpret_namespace(namespace_arg):
|
||||
"""
|
||||
Interpret the namespace argument.
|
||||
|
||||
If the argument is '1', converts it to None (representing the default namespace),
|
||||
otherwise returns the argument as is.
|
||||
|
||||
Parameters:
|
||||
namespace_arg (str): The namespace argument.
|
||||
|
||||
Returns:
|
||||
str or None: The interpreted namespace.
|
||||
"""
|
||||
return None if namespace_arg == '1' else namespace_arg
|
||||
|
||||
def main():
|
||||
parser = argparse.ArgumentParser(description="Create veth pairs between containers with optional bridge attachment.")
|
||||
parser.add_argument("-ns1", "--namespace1", default=None, help="Name of the first namespace or container, or '1' for the default namespace.")
|
||||
parser.add_argument("-ns2", "--namespace2", default=None, help="Name of the second namespace or container, or '1' for the default namespace.")
|
||||
parser.add_argument("-n1", "--name1", required=True, help="Name of the first veth interface.")
|
||||
parser.add_argument("-n2", "--name2", required=True, help="Name of the second veth interface.")
|
||||
parser.add_argument("-b1", "--bridge1", default=None, help="Name of the network bridge for ns1.")
|
||||
parser.add_argument("-b2", "--bridge2", default=None, help="Name of the network bridge for ns2.")
|
||||
parser.add_argument("-t1", "--type1", default=None, help="Container type for ns1 ('docker', 'lxc', 'lxd', 'incus', or 'None' for the default namespace).")
|
||||
parser.add_argument("-t2", "--type2", default=None, help="Container type for ns2 ('docker', 'lxc', 'lxd', 'incus', or 'None' for the default namespace).")
|
||||
|
||||
args = parser.parse_args()
|
||||
|
||||
# Processing namespace arguments and container types
|
||||
ns1, type1 = interpret_namespace(args.namespace1), args.type1
|
||||
ns2, type2 = interpret_namespace(args.namespace2), args.type2
|
||||
|
||||
# Instantiate management classes
|
||||
iface_manager = IfaceManager()
|
||||
container_exposer = ContainerNetnsExposer()
|
||||
|
||||
# Expose container network namespaces if applicable
|
||||
if type1 and ns1:
|
||||
ns1_pid = container_exposer.expose_container_netns(ns1, type1)
|
||||
ns1 = ns1_pid
|
||||
if type2 and ns2:
|
||||
ns2_pid = container_exposer.expose_container_netns(ns2, type2)
|
||||
ns2 = ns2_pid
|
||||
|
||||
# Create veth pair
|
||||
iface_manager.create_veth(args.name1, args.name2)
|
||||
|
||||
# Move ends of the veth pair to appropriate namespaces if required
|
||||
if ns1:
|
||||
iface_manager.move(args.name1, ns1)
|
||||
if ns2:
|
||||
iface_manager.move(args.name2, ns2)
|
||||
|
||||
# Optional: Attach to network bridge and bring interfaces up
|
||||
if args.bridge1 and args.name1:
|
||||
iface_manager.attach_to_bridge(args.name1, args.bridge1, ns1)
|
||||
iface_manager.set_interface_up(args.name1, ns1)
|
||||
if args.bridge2 and args.name2:
|
||||
iface_manager.attach_to_bridge(args.name2, args.bridge2, ns2)
|
||||
iface_manager.set_interface_up(args.name2, ns2)
|
||||
|
||||
# Bring up interfaces if not already up
|
||||
if not args.bridge1 and args.name1:
|
||||
iface_manager.set_interface_up(args.name1, ns1)
|
||||
if not args.bridge2 and args.name2:
|
||||
iface_manager.set_interface_up(args.name2, ns2)
|
||||
|
||||
if __name__ == "__main__":
|
||||
main()
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user