github.com/alibaba/sealer@v0.8.6-0.20220430115802-37a2bdaa8173/pkg/infra/container/client/docker/container_network.go (about)

     1  // Copyright © 2021 Alibaba Group Holding Ltd.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package docker
    16  
    17  import (
    18  	"fmt"
    19  
    20  	"github.com/docker/docker/api/types"
    21  	"github.com/docker/docker/api/types/network"
    22  )
    23  
    24  func (p *Provider) DeleteNetworkResource(id string) error {
    25  	return p.DockerClient.NetworkRemove(p.Ctx, id)
    26  }
    27  
    28  func (p *Provider) PrepareNetworkResource(networkName string) (string, error) {
    29  	networks, err := p.DockerClient.NetworkList(p.Ctx, types.NetworkListOptions{})
    30  	if err != nil {
    31  		return "", err
    32  	}
    33  	var targetIDs []string
    34  
    35  	for _, net := range networks {
    36  		if net.Name == networkName {
    37  			if len(net.Containers) > 1 {
    38  				return "", fmt.Errorf("duplicate bridge name with default %s", net.Name)
    39  			}
    40  			targetIDs = append(targetIDs, net.ID)
    41  		}
    42  	}
    43  
    44  	if len(targetIDs) > 0 {
    45  		// reuse sealer network
    46  		for i := 1; i < len(targetIDs); i++ {
    47  			err = p.DeleteNetworkResource(targetIDs[i])
    48  			if err != nil {
    49  				return "", err
    50  			}
    51  		}
    52  		return targetIDs[0], nil
    53  	}
    54  
    55  	defaultBridgeID := ""
    56  	mtu := "1500"
    57  	//get default bridge network id by name
    58  	for _, net := range networks {
    59  		if net.Name == "bridge" {
    60  			defaultBridgeID = net.ID
    61  			break
    62  		}
    63  	}
    64  
    65  	// get default network bridge config
    66  	if defaultBridgeID != "" {
    67  		defaultBridge, err := p.DockerClient.NetworkInspect(p.Ctx, defaultBridgeID, types.NetworkInspectOptions{})
    68  		if err != nil {
    69  			return "", err
    70  		}
    71  		mtu = defaultBridge.Options["com.docker.network.driver.mtu"]
    72  	}
    73  
    74  	// create sealer network
    75  	resp, err := p.DockerClient.NetworkCreate(p.Ctx, networkName, types.NetworkCreate{
    76  		Driver:     "bridge",
    77  		EnableIPv6: true,
    78  		Options: map[string]string{
    79  			"com.docker.network.bridge.enable_ip_masquerade": "true",
    80  			"com.docker.network.driver.mtu":                  mtu,
    81  		},
    82  		IPAM: &network.IPAM{
    83  			Config: []network.IPAMConfig{
    84  				{Subnet: GenerateSubnetFromName(networkName, 0)},
    85  			},
    86  		},
    87  	})
    88  
    89  	if err != nil {
    90  		return "", err
    91  	}
    92  	return resp.ID, nil
    93  }
    94  
    95  func (p *Provider) GetNetworkResourceByID(id string) (*types.NetworkResource, error) {
    96  	net, err := p.DockerClient.NetworkInspect(p.Ctx, id, types.NetworkInspectOptions{})
    97  	if err != nil {
    98  		return nil, err
    99  	}
   100  
   101  	return &net, err
   102  }