I want to run a SSH server in a separate network namespace (to keep the rest of the system unaware of the network connection, as the system is used for network testing), but want to be able to execute programs in the default network namespace via the SSH connection. What I've found out so far:
For a cross-namespace policy, assuming that you have labeled each namespace with the network/namespace:
Jul 18, 2020 · To keep the network, user and ipc namespace set lxc.namespace.keep=user net ipc. Note that sharing pid namespaces will likely not work with most init systems. Note that if the container requests a new user namespace and the container wants to inherit the network namespace it needs to inherit the user namespace as well.
Task. I need to unambiguously and without "holistic" guessing find the peer network interface of a veth end in another network namespace.. Theory ./. Reality. Albeit a lot of documentation and also answers here on SO assume that the ifindex indices of network interfaces are globally unique per host across network namespaces, this doesn't hold in many cases: ifindex/iflink are ambiguous. Jun 13, 2019 · Linux network namespaces. In a network namespace, the scoped ‘identifiers’ are network devices; so a given network device, such as eth0, exists in a particular namespace. Linux starts up with a default network namespace, so if your operating system does not do anything special, that is where all the network devices will be located. spec: NetworkPolicy spec has all the information needed to define a particular network policy in the given namespace. podSelector: Each NetworkPolicy includes a podSelector which selects the grouping of pods to which the policy applies. The example policy selects pods with the label "role=db". An empty podSelector selects all pods in the namespace.
Network namespaces provide isolation of the system resources associated with networking: network devices, IPv4 and IPv6 protocol stacks, IP routing tables, firewall rules, the /proc/net directory (which is a symbolic link to /proc/PID/net), the /sys/class/net directory, various files under /proc/sys/net, port numbers (sockets), and so on.
Jul 01, 2015 · Delete network namespace: ip netns del (name) Execute a command in a specific namespace: ip netns exec (name) (command to execute) Move a port to a namespace: ip link set (intf name) netns (net