33a575f49d
When plugin errors out, it prints out a JSON object to stdout describing the failure. This object needs to be propagated out through the plugins and to the container runtime. This change also adds Print method to both the result and error structs for easy serialization to stdout.
host-local IP address manager
host-local IPAM allocates IPv4 and IPv6 addresses out of a specified address range.
Usage
Obtain an IP
Given the following network configuration:
{
"name": "default",
"ipam": {
"type": "host-local",
"subnet": "203.0.113.0/24"
}
}
Using the command line interface
$ export CNI_COMMAND=ADD
$ export CNI_CONTAINERID=f81d4fae-7dec-11d0-a765-00a0c91e6bf6
$ ./host-local < $conf
{
"ip4": {
"ip": "203.0.113.1/24"
}
}
Backends
By default ipmanager stores IP allocations on the local filesystem using the IP address as the file name and the ID as contents. For example:
$ ls /var/lib/cni/networks/default
203.0.113.1 203.0.113.2
$ cat /var/lib/cni/networks/default/203.0.113.1
f81d4fae-7dec-11d0-a765-00a0c91e6bf6
Configuration Files
{
"name": "ipv6",
"ipam": {
"type": "host-local",
"subnet": "3ffe:ffff:0:01ff::/64",
"range-start": "3ffe:ffff:0:01ff::0010",
"range-end": "3ffe:ffff:0:01ff::0020",
"routes": [
"3ffe:ffff:0:01ff::1/64"
]
}
}
{
"name": "ipv4",
"ipam": {
"type": "host-local",
"subnet": "203.0.113.1/24",
"range-start": "203.0.113.10",
"range-end": "203.0.113.20",
"routes": [
"203.0.113.0/24"
]
}
}