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Docker 容器连接

大雁f 2022-08-22 阅读 55

一、网络端口映射

        (1)使用 -P 参数创建一个python应用容器,容器内部端口随机映射到主机的高端口(flask的默认端口随机映射主机的32772端口):

[root@VM_0_8_centos ~]# docker run -d -P training/webapp python app.py
d99251fc2b340b8d9006c64b7239baccc3ea760fb4e81ec2cc55e3b0698c3812
[root@VM_0_8_centos ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
d99251fc2b34 training/webapp "python app.py" About a minute ago Up About a minute 0.0.0.0:32772->5000/tcp suspicious_goodall

        (2)使用 -p 参数创建一个python应用容器,容器内部端口绑定到指定的主机端口(绑定了主机端口5000):

[root@VM_0_8_centos ~]# docker run -d -p 5000:5000 training/webapp python app.py
f94e5ff3c33ec5851f7b236d87f74fe3f4554161742c3d932e2b2aea636684c6
[root@VM_0_8_centos ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
f94e5ff3c33e training/webapp "python app.py" 6 seconds ago Up 5 seconds 0.0.0.0:5000->5000/tcp funny_boyd
d99251fc2b34 training/webapp "python app.py" 11 minutes ago Up 11 minutes 0.0.0.0:32772->5000/tcp suspicious_goodall

        (3)指定容器绑定的网络地址(比如绑定 127.0.0.1):

[root@VM_0_8_centos ~]# docker run -d -p 127.0.0.1:5001:5000 training/webapp python app.py
ce33ed77d163c7458a7ce2469e7d3de594e12e98aed74b2511b9fa63b5de2f7e
[root@VM_0_8_centos ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
ce33ed77d163 training/webapp "python app.py" 5 seconds ago Up 4 seconds 127.0.0.1:5001->5000/tcp compassionate_engelbart
f94e5ff3c33e training/webapp "python app.py" 2 minutes ago Up 2 minutes 0.0.0.0:5000->5000/tcp funny_boyd
d99251fc2b34 training/webapp "python app.py" 14 minutes ago Up 14 minutes 0.0.0.0:32772->5000/tcp suspicious_goodall

        这样就可以通过访问 127.0.0.1:5001 来访问容器的 5000 端口。

        (4)上面的例子中,默认都是绑定 tcp 端口,如果要绑定 UDP 端口,可以在端口后面加上 /udp:

[root@VM_0_8_centos ~]# docker run -d -p 127.0.0.1:5000:5000/udp training/webapp python app.py
c9572d8ddaf7fd04d01ae6e550bcf8c53029c31c37a505470f44f1dae5216adc
[root@VM_0_8_centos ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
c9572d8ddaf7 training/webapp "python app.py" 7 seconds ago Up 6 seconds 5000/tcp, 127.0.0.1:5000->5000/udp serene_hoover
ce33ed77d163 training/webapp "python app.py" 13 minutes ago Up 13 minutes 127.0.0.1:5001->5000/tcp compassionate_engelbart
f94e5ff3c33e training/webapp "python app.py" 16 minutes ago Up 16 minutes 0.0.0.0:5000->5000/tcp funny_boyd
d99251fc2b34 training/webapp "python app.py" 27 minutes ago Up 27 minutes 0.0.0.0:32772->5000/tcp suspicious_goodall

        (5)docker port 命令可以让我们快捷地查看端口的绑定情况:

Hello world![root@VM_0_8_centos ~]# docker port ce33ed77d163 5000
127.0.0.1:5001

二、Docker 容器互联

        端口映射并不是唯一将docker连接到另一容器的方法。

        docker有一个连接系统允许将多个容器连接到一起,共享连接信息。

        docker连接会创建一个父子关系,其中父容器可以看到子容器的信息。

        (1)容器命名

        当我们创建一个容器的时候,docker会自动给这个容器命名,当然我们也可以使用 --name 表示来给容器命名:

[root@VM_0_8_centos ~]# docker run -d -P --name webapp training/webapp python app.py
91fc9e72258f88178f28c41c4a7569c3ea98be4026c4accb631ced36db6952bf
[root@VM_0_8_centos ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
91fc9e72258f training/webapp "python app.py" 8 seconds ago Up 7 seconds 0.0.0.0:32773->5000/tcp webapp

        (2)新建网络

        创建一个新的 Docker 网络:

[root@VM_0_8_centos ~]# docker network create -d bridge test-net
c5bc87f7b959f73134f6cef67b22281d0a8742f59679b8b25f02a07920451fcf

[root@VM_0_8_centos ~]# docker network ls
NETWORK ID NAME DRIVER SCOPE
e23b89fb4e31 bridge bridge local
41c12a9c2096 host host local
c5bc87f7b959 test-net bridge local

        -d参数:指定 Docker 网络类型,有 bridge、overlay。其中 overlay 网络类型用于 Swarm mode。

        (3)连接容器

        运行一个容器并连接到新建的 test-net 网络:

[root@VM_0_8_centos ~]# docker run -itd --name test1 --network test-net ubuntu /bin/bash
ad27f04c194268d765f61ff5e95fddf85c3c4146c5fd62731be9ef6ee67ae584

        打开新的终端,再运行一个容器并加入到 test-net 网络:

[root@VM_0_8_centos ~]# docker run -itd --name test2 --network test-net ubuntu /bin/bash
8674175fb6bd060f3d201a6b74721ab75c78d5853f7db58365c3df42c87b5ab0

[root@VM_0_8_centos ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
8674175fb6bd ubuntu "/bin/bash" 20 minutes ago Up 20 minutes test2
ad27f04c1942 ubuntu "/bin/bash" 20 minutes ago Up 20

        分别进入容器并安装ping:

[root@VM_0_8_centos ~]# docker exec -it ad27f04c1942 /bin/bash
root@ad27f04c1942:/# apt-get update
root@ad27f04c1942:/# apt install iputils-ping

[root@VM_0_8_centos ~]# docker exec -it test2 /bin/bash
root@ad27f04c1942:/# apt-get update
root@ad27f04c1942:/# apt install iputils-ping

    分别ping对方:

root@ad27f04c1942:/# ping test2
PING test2 (172.18.0.3) 56(84) bytes of data.
64 bytes from test2.test-net (172.18.0.3): icmp_seq=1 ttl=64 time=0.056 ms
64 bytes from test2.test-net (172.18.0.3): icmp_seq=2 ttl=64 time=0.050 ms
64 bytes from test2.test-net (172.18.0.3): icmp_seq=3 ttl=64 time=0.055 ms
64 bytes from test2.test-net (172.18.0.3): icmp_seq=4 ttl=64 time=0.049

root@8674175fb6bd:/# ping test1
PING test1 (172.18.0.2) 56(84) bytes of data.
64 bytes from test1.test-net (172.18.0.2): icmp_seq=1 ttl=64 time=0.036 ms
64 bytes from test1.test-net (172.18.0.2): icmp_seq=2 ttl=64 time=0.070 ms
64 bytes from test1.test-net (172.18.0.2): icmp_seq=3 ttl=64 time=0.051 ms
64 bytes from test1.test-net (172.18.0.2): icmp_seq=4 ttl=64 time=0.052

        这样,test1 容器和 test2 容器建立了互联关系。

        当使用 exit命令提示There are stopped jobs.可以进行如下操作:

root@8674175fb6bd:/# ps -ef|grep ping
root 316 17 0 05:49 pts/1 00:00:00 ping test1
root 318 17 0 05:49 pts/1 00:00:00 ping test2
root@8674175fb6bd:/# kill -9 316
root@8674175fb6bd:/# kill -9 318
root@8674175fb6bd:/# exit
exit

 

 



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