Linux Network Space - HaymonEdmur/DockerConfiguration GitHub Wiki

Linux Network Space

New network space

Command Description
ip netns add braintree Adds a new network name space braintree
ip netns list Lists all network namespaces
ip netns del braintree Deletes a namespace

Run process in network name space

Execute bash in newly added netns. Root space will not be visible from new netns. There will be only one loop back interace. By default there won't be IP address assigned to it and its state will be down

# ip netns exec braintree bash 
# ip addr
1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

Configure loop back in new netns

Loop back can be used for IPC with in this netns. Network stack can be added and shared to this netns to communicate > with outer world. All processes can share one IP in this netns and can be connected to its ports from outer world.

# ip addr add 127.0.0.1/24 dev lo

# ip link set lo up

# ip addr 
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/24 scope host lo
       valid_lft forever preferred_lft forever
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever

# ping 127.0.0.1
PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.029 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.037 ms
64 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.024 ms
^C
--- 127.0.0.1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1999ms
rtt min/avg/max/mdev = 0.024/0.030/0.037/0.005 ms
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