[root@mcw1 ~]$ docker network ls #docker安装时，自动创建了三个网络 NETWORK ID NAME DRIVER SCOPE 494faac7d060 bridge bridge local cd41eede7725 host host local f1ca2d33644e none null local
指定none或者host网络运行容器
指定none网络运行容器
docker run -it --network=none busybox
[root@mcw1 ~]$ docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
5f32a681a40e registry:2 "/entrypoint.sh /etc…" 4 days ago Up 16 minutes 0.0.0.0:5000->5000/tcp, :::5000->5000/tcp vigorous_golick
[root@mcw1 ~]$
[root@mcw1 ~]$ docker run -it --network=none busybox
/ # ifconfig
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
/ #
/ # ping 10.0.0.131
PING 10.0.0.131 (10.0.0.131): 56 data bytes
ping: sendto: Network is unreachable
/ # ping 127.0.0.1
PING 127.0.0.1 (127.0.0.1): 56 data bytes
64 bytes from 127.0.0.1: seq=0 ttl=64 time=0.172 ms
桥接网络
[root@mcw1 ~]$ brctl #没有查看命令
-bash: brctl: command not found
解决方法：
[root@mcw1 ~]$ yum install bridge-utils
[root@mcw1 ~]$ brctl show #查看桥接网络
bridge name bridge id STP enabled interfaces
docker0 8000.024297f6f9f5 no veth1e4bc85
veth43e82ce
[root@mcw1 ~]$ docker run -d httpd #运行一个容器后，再看桥接网络
2f2c3267c3fea477975160249c4854190693dda7df2fbe8ea556dc96a971a1d3
[root@mcw1 ~]$ brctl show #发现运行一个容器后，docker0多个个接口
bridge name bridge id STP enabled interfaces
docker0 8000.024297f6f9f5 no veth1e4bc85
veth43e82ce
vethcde8cf7
[root@mcw1 ~]$ docker ps #查看容器
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
2f2c3267c3fe httpd "httpd-foreground" 6 minutes ago Up 6 minutes 80/tcp gifted_franklin
86193a633fa7 centos "/bin/bash" 11 minutes ago Up 11 minutes laughing_liskov
5f32a681a40e registry:2 "/entrypoint.sh /etc…" 4 days ago Up 39 minutes 0.0.0.0:5000->5000/tcp, :::5000->5000/tcp vigorous_golick
[root@mcw1 ~]$ docker exec -it 861 /bin/bash #进入容器
[root@86193a633fa7 /]# ls
bin dev etc home lib lib64 lost+found media mnt opt proc root run sbin srv sys tmp usr var
[root@86193a633fa7 /]# ip a #查看容器网卡信息
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 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
21: eth0@if22: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
link/ether 02:42:ac:11:00:02 brd ff:ff:ff:ff:ff:ff link-netnsid 0
inet 172.17.0.2/16 brd 172.17.255.255 scope global eth0
valid_lft forever preferred_lft forever
[root@86193a633fa7 /]# exit
[root@mcw1 ~]$ brctl show
bridge name bridge id STP enabled interfaces
docker0 8000.024297f6f9f5 no veth1e4bc85
veth43e82ce
vethcde8cf7
[root@mcw1 ~]$
[root@mcw1 ~]$ docker network inspect bridge #查看桥接网络
[
{
"Name": "bridge",
"Id": "494faac7d0608e95196457a5c9fbadd888ad69db2db3ef567965dd86ae9456a6",
"Created": "2021-12-31T09:13:37.431413692+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": {
"2f2c3267c3fea477975160249c4854190693dda7df2fbe8ea556dc96a971a1d3": {
"Name": "gifted_franklin",
"EndpointID": "478447d435355c772111ae2e72c0f18248eb25dc1345a68bb31e3b138471cc0c",
"MacAddress": "02:42:ac:11:00:03",
"IPv4Address": "172.17.0.3/16",
"IPv6Address": ""
},
"5f32a681a40e44455a9016cb7bc8a365aaaee83470c75988399d93fe7db93a81": {
"Name": "vigorous_golick",
"EndpointID": "de6459bd4d725fe5a2c0808d42e93f68fc563883a6af7dc72b10ba4feed7c1a2",
"MacAddress": "02:42:ac:11:00:04",
"IPv4Address": "172.17.0.4/16",
"IPv6Address": ""
},
"86193a633fa74957ef4f09b3abbe6bf8c19f6139824247f4b2ee3aa1b04202be": {
"Name": "laughing_liskov",
"EndpointID": "fc15ac2a2296481a56047d08aa1f0f39df28225d0a6229c040d7cd3552fba05a",
"MacAddress": "02:42:ac:11:00:02",
"IPv4Address": "172.17.0.2/16",
"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": {}
}
]
[root@mcw1 ~]$ ip a #查看宿主机网卡信息
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
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
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:d3:09:d5 brd ff:ff:ff:ff:ff:ff
inet 10.0.0.131/24 brd 10.0.0.255 scope global ens33
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fed3:9d5/64 scope link
valid_lft forever preferred_lft forever
3: ens37: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:d3:09:df brd ff:ff:ff:ff:ff:ff
inet 172.16.1.131/24 brd 172.16.1.255 scope global ens37
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fed3:9df/64 scope link
valid_lft forever preferred_lft forever
4: docker0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
link/ether 02:42:97:f6:f9:f5 brd ff:ff:ff:ff:ff:ff
inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
valid_lft forever preferred_lft forever
inet6 fe80::42:97ff:fef6:f9f5/64 scope link
valid_lft forever preferred_lft forever
14: veth43e82ce@if13: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master docker0 state UP
link/ether 1e:02:6d:67:dc:b1 brd ff:ff:ff:ff:ff:ff link-netnsid 2
inet6 fe80::1c02:6dff:fe67:dcb1/64 scope link
valid_lft forever preferred_lft forever
22: veth1e4bc85@if21: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master docker0 state UP
link/ether be:ba:17:78:b7:85 brd ff:ff:ff:ff:ff:ff link-netnsid 0
inet6 fe80::bcba:17ff:fe78:b785/64 scope link
valid_lft forever preferred_lft forever
24: vethcde8cf7@if23: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master docker0 state UP
link/ether e2:ab:b3:bd:ea:44 brd ff:ff:ff:ff:ff:ff link-netnsid 1
inet6 fe80::e0ab:b3ff:febd:ea44/64 scope link
valid_lft forever preferred_lft forever
[root@mcw1 ~]$ brctl show
bridge name bridge id STP enabled interfaces
docker0 8000.024297f6f9f5 no veth1e4bc85
veth43e82ce
vethcde8cf7
[root@mcw1 ~]$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
2f2c3267c3fe httpd "httpd-foreground" 10 minutes ago Up 10 minutes 80/tcp gifted_franklin
86193a633fa7 centos "/bin/bash" 16 minutes ago Up 16 minutes laughing_liskov
5f32a681a40e registry:2 "/entrypoint.sh /etc…" 4 days ago Up 43 minutes 0.0.0.0:5000->5000/tcp, :::5000->5000/tcp vigorous_golick
[root@mcw1 ~]$
由图可知，创建一个docker容器，默认在桥接docker0网卡上创建一个接口。接口名称和网卡@前面的值一样，。@后面的f 然后接网卡前面的数字，
[root@mcw1 ~]$ ifconfig
docker0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.17.0.1 netmask 255.255.0.0 broadcast 172.17.255.255
inet6 fe80::42:97ff:fef6:f9f5 prefixlen 64 scopeid 0x20<link>
ether 02:42:97:f6:f9:f5 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 5 bytes 438 (438.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.0.0.131 netmask 255.255.255.0 broadcast 10.0.0.255
inet6 fe80::20c:29ff:fed3:9d5 prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:d3:09:d5 txqueuelen 1000 (Ethernet)
RX packets 14427 bytes 9387349 (8.9 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 7727 bytes 774908 (756.7 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ens37: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.16.1.131 netmask 255.255.255.0 broadcast 172.16.1.255
inet6 fe80::20c:29ff:fed3:9df prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:d3:09:df txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 10 bytes 768 (768.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1 (Local Loopback)
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
veth1e4bc85: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet6 fe80::bcba:17ff:fe78:b785 prefixlen 64 scopeid 0x20<link>
ether be:ba:17:78:b7:85 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 8 bytes 648 (648.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
veth43e82ce: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet6 fe80::1c02:6dff:fe67:dcb1 prefixlen 64 scopeid 0x20<link>
ether 1e:02:6d:67:dc:b1 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 8 bytes 648 (648.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
vethcde8cf7: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet6 fe80::e0ab:b3ff:febd:ea44 prefixlen 64 scopeid 0x20<link>
ether e2:ab:b3:bd:ea:44 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 8 bytes 648 (648.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@mcw1 ~]$