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文章目录
Docker引擎

docker容器网络配置

ZiChen D
ZiChen D
2021-12-05 / 0 评论 / 0 点赞 / 396 阅读 / 22,151 字 / 正在检测是否收录...

Linux内核实现名称空间的创建

ip netns命令

可以借助ip netns命令来完成对 Network Namespace 的各种操作。ip netns命令来自于iproute安装包，一般系统会默认安装，如果没有的话，请自行安装。

注意：ip netns命令修改网络配置时需要 sudo 权限。

可以通过ip netns命令完成对Network Namespace 的相关操作，可以通过ip netns help查看命令帮助信息：

[root@docker ~]# ip netns help
Usage:	ip netns list
	ip netns add NAME
	ip netns attach NAME PID
	ip netns set NAME NETNSID
	ip [-all] netns delete [NAME]
	ip netns identify [PID]
	ip netns pids NAME
	ip [-all] netns exec [NAME] cmd ...
	ip netns monitor
	ip netns list-id [target-nsid POSITIVE-INT] [nsid POSITIVE-INT]
NETNSID := auto | POSITIVE-INT

默认情况下，Linux系统中是没有任何 Network Namespace的，所以ip netns list命令不会返回任何信息。

创建Network Namespace

通过命令创建一个名为ns0的命名空间：

[root@docker ~]# ip netns list
[root@docker ~]# ip netns add ns0
[root@docker ~]# ip netns list
ns0

新创建的 Network Namespace 会出现在/var/run/netns/目录下。如果相同名字的 namespace 已经存在，命令会报Cannot create namespace file "/var/run/netns/ns0": File exists的错误。

[root@docker ~]# ls /var/run/netns/
ns0
[root@docker ~]# ip netns add ns0
Cannot create namespace file "/var/run/netns/ns0": File exists

对于每个 Network Namespace 来说，它会有自己独立的网卡、路由表、ARP 表、iptables 等和网络相关的资源。

操作Network Namespace

ip命令提供了ip netns exec子命令可以在对应的 Network Namespace 中执行命令。

查看新创建 Network Namespace 的网卡信息

[root@docker ~]# ip netns exec ns0 ip addr
1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

可以看到，新创建的Network Namespace中会默认创建一个lo回环网卡，此时网卡处于关闭状态。此时，尝试去 ping 该lo回环网卡，会提示Network is unreachable

[root@docker ~]# ip netns exec ns0 ping 127.0.0.1
connect: 网络不可达

通过下面的命令启用lo回环网卡：

[root@docker ~]# ip netns exec ns0 ip link set lo up
[root@docker ~]# ip netns exec ns0 ping 127.0.0.1
PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.018 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.017 ms
64 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.025 ms

转移设备

我们可以在不同的 Network Namespace 之间转移设备（如veth）。由于一个设备只能属于一个 Network Namespace ，所以转移后在这个 Network Namespace 内就看不到这个设备了。

其中，veth设备属于可转移设备，而很多其它设备（如lo、vxlan、ppp、bridge等）是不可以转移的。

veth pair

veth pair 全称是 Virtual Ethernet Pair，是一个成对的端口，所有从这对端口一 端进入的数据包都将从另一端出来，反之也是一样。
引入veth pair是为了在不同的 Network Namespace 直接进行通信，利用它可以直接将两个 Network Namespace 连接起来。

创建veth pair

[root@docker ~]# ip link add type veth
[root@docker ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 00:0c:29:e1:e2:02 brd ff:ff:ff:ff:ff:ff
    inet 192.168.160.121/24 brd 192.168.160.255 scope global noprefixroute ens160
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fee1:e202/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default 
    link/ether 02:42:5f:f0:83:9d 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
4: veth0@veth1: <BROADCAST,MULTICAST,M-DOWN> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 6a:6d:f2:43:7f:5b brd ff:ff:ff:ff:ff:ff
5: veth1@veth0: <BROADCAST,MULTICAST,M-DOWN> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 92:99:31:71:98:45 brd ff:ff:ff:ff:ff:ff

可以看到，此时系统中新增了一对veth pair，将veth0和veth1两个虚拟网卡连接了起来，此时这对 veth pair 处于”未启用“状态。

实现Network Namespace间通信

下面我们利用veth pair实现两个不同的 Network Namespace 之间的通信。刚才我们已经创建了一个名为ns0的 Network Namespace，下面再创建一个信息Network Namespace，命名为ns1

[root@docker ~]# ip netns add ns1
[root@docker ~]# ip netns list
ns1
ns0

然后我们将veth0加入到ns0，将veth1加入到ns1

[root@docker ~]# ip link set veth0 netns ns0
[root@docker ~]# ip link set veth1 netns ns1

然后我们分别为这对veth pair配置上ip地址，并启用它们

[root@docker ~]# ip netns exec ns0 ip link set veth0 up
[root@docker ~]# ip netns exec ns0 ip addr add 192.168.160.200/24 dev veth0
[root@docker ~]# ip netns exec ns1 ip link set lo up
[root@docker ~]# ip netns exec ns1 ip link set veth1 up
[root@docker ~]# ip netns exec ns1 ip addr add 192.168.160.210/24 dev veth1

查看这对veth pair的状态

[root@docker ~]# ip netns exec ns0 ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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
4: veth0@if5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 6a:6d:f2:43:7f:5b brd ff:ff:ff:ff:ff:ff link-netns ns1
    inet 192.168.160.200/24 scope global veth0
       valid_lft forever preferred_lft forever
    inet6 fe80::686d:f2ff:fe43:7f5b/64 scope link 
       valid_lft forever preferred_lft forever

[root@docker ~]# ip netns exec ns1 ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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
5: veth1@if4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 92:99:31:71:98:45 brd ff:ff:ff:ff:ff:ff link-netns ns0
    inet 192.168.160.210/24 scope global veth1
       valid_lft forever preferred_lft forever
    inet6 fe80::9099:31ff:fe71:9845/64 scope link 
       valid_lft forever preferred_lft forever

从上面可以看出，我们已经成功启用了这个veth pair，并为每个veth设备分配了对应的ip地址。我们尝试在ns1中访问ns0中的ip地址：

[root@docker ~]# ip netns exec ns1 ping 192.168.160.200
PING 192.168.160.200 (192.168.160.200) 56(84) bytes of data.
64 bytes from 192.168.160.200: icmp_seq=1 ttl=64 time=0.021 ms
64 bytes from 192.168.160.200: icmp_seq=2 ttl=64 time=0.065 ms
64 bytes from 192.168.160.200: icmp_seq=3 ttl=64 time=0.023 ms

可以看到，veth pair成功实现了两个不同Network Namespace之间的网络交互。

veth设备重命名

[root@docker ~]# ip netns exec ns0 ip link set veth0 down
[root@docker ~]# ip netns exec ns0 ip link set dev veth0 name eth0
[root@docker ~]# ip netns exec ns0 ifconfig -a
eth0: flags=4098<BROADCAST,MULTICAST>  mtu 1500
        inet 192.168.160.200  netmask 255.255.255.0  broadcast 0.0.0.0
        ether 6a:6d:f2:43:7f:5b  txqueuelen 1000  (Ethernet)
        RX packets 17  bytes 1342 (1.3 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 17  bytes 1342 (1.3 KiB)
        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 1000  (Local Loopback)
        RX packets 6  bytes 504 (504.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 6  bytes 504 (504.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

四种网络模式配置

bridge模式配置

[root@docker ~]# docker run -it --name test1 --rm busybox
Unable to find image 'busybox:latest' locally
latest: Pulling from library/busybox
3aab638df1a9: Pull complete 
Digest: sha256:52817dece4cfe26f581c834d27a8e1bcc82194f914afe6d50afad5a101234ef1
Status: Downloaded newer image for busybox:latest
/ # ifconfig 
eth0      Link encap:Ethernet  HWaddr 02:42:AC:11:00:02  
          inet addr:172.17.0.2  Bcast:172.17.255.255  Mask:255.255.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:12 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:1032 (1.0 KiB)  TX bytes:0 (0.0 B)

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:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

/ # exit
# 在创建容器时添加--network bridge与不加--network选项效果是一致的

none模式配置

[root@docker ~]# docker run -it --name test --network none --rm busybox
/ # ifconfig -a
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:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

/ # exit

container模式配置

启动第一个容器

[root@docker ~]# docker run -it --name test1 --rm busybox
/ # ifconfig 
eth0      Link encap:Ethernet  HWaddr 02:42:AC:11:00:02  
          inet addr:172.17.0.2  Bcast:172.17.255.255  Mask:255.255.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:10 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:836 (836.0 B)  TX bytes:0 (0.0 B)

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:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

启动第二个容器

[root@docker ~]# docker run -it --name test2 --rm busybox
/ # ifconfig 
eth0      Link encap:Ethernet  HWaddr 02:42:AC:11:00:03  
          inet addr:172.17.0.3  Bcast:172.17.255.255  Mask:255.255.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:6 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:516 (516.0 B)  TX bytes:0 (0.0 B)

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:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

/ # exit

可以看到名为test2的容器IP地址是172.17.0.3，与第一个容器的IP地址不是一样的，也就是说并没有共享网络，此时如果我们将第二个容器的启动方式改变一下，就可以使名为b2的容器IP与B1容器IP一致，也即共享IP，但不共享文件系统。

[root@docker ~]# docker run -it --name test2 --rm --network container:test1 busybox
/ # ifconfig 
eth0      Link encap:Ethernet  HWaddr 02:42:AC:11:00:02  
          inet addr:172.17.0.2  Bcast:172.17.255.255  Mask:255.255.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:13 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:1046 (1.0 KiB)  TX bytes:0 (0.0 B)

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:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

此时我们在test1容器上创建一个目录

/ # mkdir /tmp/data
/ # ls /tmp/
data

到test2容器上检查/tmp目录会发现并没有这个目录，因为文件系统是处于隔离状态，仅仅是共享了网络而已。

在test2容器上部署一个站点

/ # echo 'Welcome to myhome' > /tmp/index.html
/ # ls /tmp/
index.html
/ # httpd -h /tmp/
/ # netstat -anlt
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       
tcp        0      0 :::80                   :::*                    LISTEN

在test1容器上用本地地址去访问此站点

/ # wget -O - -q 127.0.0.1:80
Welcome to myhome

由此可见，container模式下的容器间关系就相当于一台主机上的两个不同进程

host模式配置

启动容器时直接指明模式为host

[root@localhost ~]# docker run -it --name test --rm --network host busybox
/ # ifconfig 
docker0   Link encap:Ethernet  HWaddr 02:42:AB:E3:B6:C0  
          inet addr:172.17.0.1  Bcast:172.17.255.255  Mask:255.255.0.0
          inet6 addr: fe80::42:abff:fee3:b6c0/64 Scope:Link
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 B)  TX bytes:626 (626.0 B)

ens160    Link encap:Ethernet  HWaddr 00:0C:29:E1:E2:02  
          inet addr:192.168.160.121  Bcast:192.168.160.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fee1:e202/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:72792 errors:0 dropped:0 overruns:0 frame:0
          TX packets:35912 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:103483358 (98.6 MiB)  TX bytes:2262209 (2.1 MiB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:24 errors:0 dropped:0 overruns:0 frame:0
          TX packets:24 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:2040 (1.9 KiB)  TX bytes:2040 (1.9 KiB)

此时如果我们在这个容器中启动一个http站点，我们就可以直接用宿主机的IP直接在浏览器中访问这个容器中的站点了。

容器的常用操作

查看容器的主机名

[root@docker ~]# docker run -it --name test1 --network bridge --rm busybox
/ # hostname
49d64989a354

在容器启动时注入主机名

[root@docker ~]# docker run -it --name test --network bridge --hostname dengzichen --rm busybox
/ # hostname
dengzichen

/ # cat /etc/hosts
127.0.0.1	localhost
::1	localhost ip6-localhost ip6-loopback
fe00::0	ip6-localnet
ff00::0	ip6-mcastprefix
ff02::1	ip6-allnodes
ff02::2	ip6-allrouters
172.17.0.2	dengzichen

/ # cat /etc/resolv.conf 
# Generated by NetworkManager
nameserver 192.168.160.2
nameserver 114.114.114.114

/ # ping baidu.com
PING baidu.com (220.181.38.148): 56 data bytes
64 bytes from 220.181.38.148: seq=0 ttl=127 time=28.963 ms
64 bytes from 220.181.38.148: seq=1 ttl=127 time=29.543 ms
64 bytes from 220.181.38.148: seq=2 ttl=127 time=29.418 ms

手动指定容器要使用的DNS

[root@docker ~]# docker run -it --name test --network bridge --hostname dengzichen --dns 8.8.8.8 --rm busybox
/ # cat /etc/resolv.conf 
nameserver 8.8.8.8

/ # nslookup -type=a baidu.com
Server:		8.8.8.8
Address:	8.8.8.8:53

Non-authoritative answer:
Name:	baidu.com
Address: 220.181.38.148
Name:	baidu.com
Address: 220.181.38.251

手动往/etc/hosts文件中注入主机名到IP地址的映射

[root@docker ~]# docker run -it --name test --network bridge --hostname dengzichen --add-host www.dzc.com:1.1.1.1 --rm busybox
/ # cat /etc/hosts 
127.0.0.1	localhost
::1	localhost ip6-localhost ip6-loopback
fe00::0	ip6-localnet
ff00::0	ip6-mcastprefix
ff02::1	ip6-allnodes
ff02::2	ip6-allrouters
1.1.1.1	www.dzc.com
172.17.0.2	dengzichen

开放容器端口

执行docker run的时候有个-p选项，可以将容器中的应用端口映射到宿主机中，从而实现让外部主机可以通过访问宿主机的某端口来访问容器内应用的目的。

-p选项能够使用多次，其所能够暴露的端口必须是容器确实在监听的端口。

-p选项的使用格式：

  • -p < containerPort >
    • 将指定的容器端口映射至主机所有地址的一个动态端口
  • -p < hostPort >:< containerPort >
    • 将容器端口映射至指定的主机端口
  • -p < ip >::< containerPort >
    • 将指定的容器端口映射至主机指定的动态端口
  • -p < ip >:< hostPort >:< containerPort >
    • 将指定的容器端口映射至主机指定的端口

动态端口指的是随机端口，具体的映射结果可使用docker port命令查看。

[root@docker ~]# docker run --name web --rm -p 80 nginx
Unable to find image 'nginx:latest' locally
latest: Pulling from library/nginx
e5ae68f74026: Pull complete 
21e0df283cd6: Pull complete 
ed835de16acd: Pull complete 
881ff011f1c9: Pull complete 
77700c52c969: Pull complete 
44be98c0fab6: Pull complete 
Digest: sha256:9522864dd661dcadfd9958f9e0de192a1fdda2c162a35668ab6ac42b465f0603
Status: Downloaded newer image for nginx:latest

以上命令执行后会一直占用着前端，我们新开一个终端连接来看一下容器的80端口被映射到了宿主机的什么端口上

[root@docker ~]# docker port web
80/tcp -> 0.0.0.0:49153
80/tcp -> :::49153

由此可见，容器的80端口被暴露到了宿主机的49153端口上，此时我们在宿主机上访问一下这个端口看是否能访问到容器内的站点

[root@docker ~]# curl http://127.0.0.1:49153
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

最常用的一种就是指定映射的端口号，将容器的80映射到本机的指定8080端口号

[root@docker ~]# docker run -d --name web --rm -p 8080:80 nginx
6d8fb7ee4500126a4acd7b77d1e3ea29854c4efea2c0be50e042808a62299c79

[root@docker ~]# ss -anlt
State           Recv-Q          Send-Q                   Local Address:Port                    Peer Address:Port          Process          
LISTEN          0               128                            0.0.0.0:8080                         0.0.0.0:*                              
LISTEN          0               128                            0.0.0.0:22                           0.0.0.0:*                              
LISTEN          0               128                               [::]:8080                            [::]:*                              
LISTEN          0               128                               [::]:22                              [::]:*                              
[root@docker ~]# curl http://127.0.0.1:8080
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

iptables防火墙规则将随容器的创建自动生成，随容器的删除自动删除规则。

将容器端口映射到指定IP的随机端口

[root@docker ~]# docker run --name web --rm -p 192.168.160.121::80 nginx
/docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration
/docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/
/docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
10-listen-on-ipv6-by-default.sh: info: Getting the checksum of /etc/nginx/conf.d/default.conf
10-listen-on-ipv6-by-default.sh: info: Enabled listen on IPv6 in /etc/nginx/conf.d/default.conf
/docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh
/docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh
/docker-entrypoint.sh: Configuration complete; ready for start up

在另一个终端上查看端口映射情况

[root@docker ~]# docker port web
80/tcp -> 192.168.160.121:49153

自定义docker0桥的网络属性信息

官方文档相关配置

自定义docker0桥的网络属性信息需要修改/etc/docker/daemon.json配置文件

[root@docker ~]# cat /etc/docker/daemon.json 
{
  "registry-mirrors": ["https://1aq1u7oh.mirror.aliyuncs.com"]
}

{				//添加此段。IP根据自己意愿更改
    "bip": "192.168.160.250/24",
    "fixed-cidr": "192.168.160.250/25",
    "fixed-cidr-v6": "2021:vd6::/64",
    "mtu": 1500,
    "default-gateway": "172.17.1.2",
    "default-gateway-v6": "2021:vd6:dfgh::96",
    "dns": ["172.17.1.2","114.114.114.114"]
}

核心选项为bip，即bridge ip之意，用于指定docker0桥自身的IP地址；其它选项可通过此地址计算得出。

docker远程连接

dockerd守护进程的C/S，其默认仅监听Unix Socket格式的地址(/var/run/docker.sock)，如果要使用TCP套接字，则需要修改/etc/docker/daemon.json配置文件，添加如下内容，然后重启docker服务：

"hosts": ["tcp://0.0.0.0:2375", "unix:///var/run/docker.sock"]

在客户端上向dockerd直接传递“-H|--host”选项指定要控制哪台主机上的docker容器

[root@docker ~]# docker -H 192.168.160.121:2375 ps

docker创建自定义桥

创建一个额外的自定义桥，区别于docker0

[root@docker ~]# docker network ls
NETWORK ID     NAME      DRIVER    SCOPE
a6d59f7d63bb   bridge    bridge    local
e87b98abd383   host      host      local
fcf87b24928d   none      null      local

[root@docker ~]# docker network create -d bridge --subnet "192.168.159.0/24" --gateway "192.168.159.1" br0
0fea6cc453adb324cb0ddd27efa3bd2f5a6cc7864c0faab3ca9c564c7e03b843

[root@docker ~]# docker network ls
NETWORK ID     NAME      DRIVER    SCOPE
0fea6cc453ad   br0       bridge    local
a6d59f7d63bb   bridge    bridge    local
e87b98abd383   host      host      local
fcf87b24928d   none      null      local

使用新创建的自定义桥来创建容器：

[root@docker ~]# docker run -it --name test --network br0 busybox
/ # ifconfig 
eth0      Link encap:Ethernet  HWaddr 02:42:C0:A8:9F:02  
          inet addr:192.168.159.2  Bcast:192.168.159.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:11 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:962 (962.0 B)  TX bytes:0 (0.0 B)

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:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

再创建一个容器，使用默认的bridge桥：

[root@docker ~]# docker run -it --name test2 busybox
/ # ifconfig 
eth0      Link encap:Ethernet  HWaddr 02:42:AC:11:00:02  
          inet addr:172.17.0.2  Bcast:172.17.255.255  Mask:255.255.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:8 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:696 (696.0 B)  TX bytes:0 (0.0 B)

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:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
0
Docker
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