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nspawn: add new --network-zone= switch for automatically managed bridge devices

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This adds a new concept of network "zones", which are little more than bridge
devices that are automatically managed by nspawn: when the first container
referencing a bridge is started, the bridge device is created, when the last
container referencing it is removed the bridge device is removed again. Besides
this logic --network-zone= is pretty much identical to --network-bridge=.

The usecase for this is to make it easy to run multiple related containers
(think MySQL in one and Apache in another) in a common, named virtual Ethernet
broadcast zone, that only exists as long as one of them is running, and fully
automatically managed otherwise.
This commit is contained in:
Lennart Poettering
2016-05-09 15:45:31 +02:00
parent ef76dff225
commit 22b28dfdc7
6 changed files with 242 additions and 50 deletions
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src/nspawn/nspawn-network.h
+2 -1
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@@ -26,7 +26,8 @@
int setup_veth(const char *machine_name, pid_t pid, char iface_name[IFNAMSIZ], bool bridge);
int setup_veth_extra(const char *machine_name, pid_t pid, char **pairs);
int setup_bridge(const char *veth_name, const char *bridge_name);
int setup_bridge(const char *veth_name, const char *bridge_name, bool create);
int remove_bridge(const char *bridge_name);
int setup_macvlan(const char *machine_name, pid_t pid, char **ifaces);
int setup_ipvlan(const char *machine_name, pid_t pid, char **ifaces);