Docker 学习笔记 - 进阶四 Docker网络

4. docker 网络
- 4.1 docker network是什么
- - 4.1.1 docker不启动，默认网络情况
  - 4.1.2 docker启动后，网络情况
- 4.2 docker network 常用基本命令
- - 4.2.1 全部 network 命令
  - 4.2.2 查看网络： docker network ls
  - 4.2.3 创建和删除网络：
  - 4.2.3 查看网络源数据
- 4.3 docker network 能解决什么问题
- 4.4 docker network 的网络模式

笔记记录学习尚硅谷周阳老师的 docker 教程
链接地址： https://www.bilibili.com/video/BV1gr4y1U7CY?p=1

4. docker 网络 4.1 docker network是什么 4.1.1 docker不启动，默认网络情况

[root@vm001 admin]# ifconfig
ens33: flags=4163  mtu 1500
        inet 192.168.226.128  netmask 255.255.255.0  broadcast 192.168.226.255
        inet6 fe80::8805:f678:285c:a5c0  prefixlen 64  scopeid 0x20
        ether 00:0c:29:e7:21:88  txqueuelen 1000  (Ethernet)
        RX packets 258  bytes 67570 (65.9 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 140  bytes 16053 (15.6 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 48  bytes 4080 (3.9 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 48  bytes 4080 (3.9 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

virbr0: flags=4099  mtu 1500
        inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255
        ether 52:54:00:ff:4f:c6  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

1). ens33: linux 宿主机的地址
2). lo: local, 本地地址
3). virbr0: 在CentOS7的安装过程中如果有选择相关虚拟化的的服务安装系统后，启动网卡时会发现有一个以网桥连接的私网地址的virbr0网卡(virbr0网卡：它还有一个固定的默认IP地址192.168.122.1)，是做虚拟机网桥的使用的，其作用是为连接其上的虚机网卡提供 NAT访问外网的功能。
Linux安装在勾选安装系统的时候附带了libvirt服务才会生成的一个东西，如果不需要可以直接将libvirtd服务卸载，

yum remove libvirt-libs.x86_64

4.1.2 docker启动后，网络情况

会产生一个名为docker0的虚拟网桥

## 启动 docker
[root@vm001 admin]# systemctl start docker
[root@vm001 admin]# docker images
REPOSITORY                                                    TAG          IMAGE ID       CREATED         SIZE
orderservice6001                                              v1.1         f5c5e0bb8815   22 hours ago    685MB
## 查询 ip网络信息
[root@vm001 admin]# ifconfig
docker0: flags=4163  mtu 1500
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 172.17.255.255
        inet6 fe80::42:f5ff:fea1:eede  prefixlen 64  scopeid 0x20
        ether 02:42:f5:a1:ee:de  txqueuelen 0  (Ethernet)
        RX packets 31  bytes 2658 (2.5 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 52  bytes 18674 (18.2 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
## 其余省略

查看docker网络模式命令：docker network ls
--------- 默认创建三大网络模式

[root@vm001 admin]# docker network ls
NETWORK ID     NAME      DRIVER    SCOPE
3f6c87b881bb   bridge    bridge    local
2e4dd2180dd1   host      host      local
4fdddc082793   none      null      local
[root@vm001 admin]#

4.2 docker network 常用基本命令 4.2.1 全部 network 命令

[root@vm001 admin]# docker network --help

Usage:  docker network COMMAND

Manage networks

Commands:
  connect     Connect a container to a network
  create      Create a network
  disconnect  Disconnect a container from a network
  inspect     Display detailed information on one or more networks
  ls          List networks
  prune       Remove all unused networks
  rm          Remove one or more networks

Run 'docker network COMMAND --help' for more information on a command.

4.2.2 查看网络： docker network ls

在4.1.2 中有

4.2.3 创建和删除网络：

创建： docker network create

[root@vm001 admin]# docker network create aa_network
e810395831b1e5069e447c6730df76917dbb981c82e5519970c3d33965f463f3
[root@vm001 admin]# docker network ls
NETWORK ID     NAME         DRIVER    SCOPE
e810395831b1   aa_network   bridge    local
3f6c87b881bb   bridge       bridge    local
2e4dd2180dd1   host         host      local
4fdddc082793   none         null      local

删除： docker network rm

[root@vm001 admin]# docker network rm aa_network 
aa_network
[root@vm001 admin]# docker network ls
NETWORK ID     NAME      DRIVER    SCOPE
3f6c87b881bb   bridge    bridge    local
2e4dd2180dd1   host      host      local
4fdddc082793   none      null      local

4.2.3 查看网络源数据

docker network inspect XXX网络名字
如： docker network inspect bridge
显示出来的就是上面看到的 docker0 那个网桥

[root@vm001 admin]# docker network ls
NETWORK ID     NAME      DRIVER    SCOPE
3f6c87b881bb   bridge    bridge    local
2e4dd2180dd1   host      host      local
4fdddc082793   none      null      local
[root@vm001 admin]# docker network inspect bridge
[
    {
        "Name": "bridge",
        "Id": "3f6c87b881bbceedca34897b2fa0794a52269d10de7dd0c84ab694a927325c5d",
        "Created": "2022-05-09T23:32:21.056937312+08:00",
        "Scope": "local",
        "Driver": "bridge",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": null,
            "Config": [
                {
                    "Subnet": "172.17.0.0/16",
                    "Gateway": "172.17.0.1"
                }
            ]
        },
        "Internal": false,
        "Attachable": false,
        "Ingress": false,
        "ConfigFrom": {
            "Network": ""
        },
        "ConfigOnly": false,
        "Containers": {
            "b014f0b061b4c39c5d13cfdcbc38e4cbb64cbb8c5939ba4fa2385cbd5628165b": {
                "Name": "suspicious_keldysh",
                "EndpointID": "1677be925e9c7c04a5a1651f48c16f62b7efca13d96c34e6c82c4607c0dd84f7",
                "MacAddress": "02:42:ac:11:00:02",
                "IPv4Address": "172.17.0.2/16",
                "IPv6Address": ""
            },
            "e2ddfc2abe317482bac74809279e91bbd91a55cbdc2a842720317993d0b1c091": {
                "Name": "zk01",
                "EndpointID": "304da47bd4bb8e0dafca3ebda522b5587e5d301a30e060dab9ce2c1ab56ab9a7",
                "MacAddress": "02:42:ac:11:00:03",
                "IPv4Address": "172.17.0.3/16",
                "IPv6Address": ""
            },
            "f27be7bd716acb811fd9d28fa4809e19a60c88db9cceefddafb3eae65a113ee8": {
                "Name": "consul",
                "EndpointID": "6d3d9798c592807b3c9a9a817d536ce860a28c455e69ccf1340216d0342f461e",
                "MacAddress": "02:42:ac:11:00:04",
                "IPv4Address": "172.17.0.4/16",
                "IPv6Address": ""
            }
        },
        "Options": {
            "com.docker.network.bridge.default_bridge": "true",
            "com.docker.network.bridge.enable_icc": "true",
            "com.docker.network.bridge.enable_ip_masquerade": "true",
            "com.docker.network.bridge.host_binding_ipv4": "0.0.0.0",
            "com.docker.network.bridge.name": "docker0",
            "com.docker.network.driver.mtu": "1500"
        },
        "Labels": {}
    }
]

4.3 docker network 能解决什么问题

在单机模式不明显，但是在公司，需要作docker网络管理和容器调用之间的规划。
需要考虑使用常见的网络桥接模式还是其他模式等问题

1). 容器间的互联和通信以及端口映射
2). 容器IP变动时候可以通过服务名直接网络通信而不受到影响

4.4 docker network 的网络模式

Docker 学习笔记 - 进阶四 Docker网络

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