[英]How can I ping other containers in a docker network through their hostname?
I have a simple docker-compose set up as follows. 我有一个简单的docker-compose设置如下。
version: "3"
services:
main:
image: python:3.5.2
entrypoint: /usr/bin/yes
network_mode: bridge
another:
image: python:3.5.2
entrypoint: /usr/bin/yes
network_mode: bridge
If I run and try to ping the other container, I get the following output. 如果我运行并尝试ping另一个容器,我得到以下输出。
$ docker-compose up -d
Recreating dockerplayground_main_1 ...
Recreating dockerplayground_another_1 ... done
$ docker-compose ps
Name Command State Ports
---------------------------------------------------------
dockerplayground_another_1 /usr/bin/yes Up
dockerplayground_main_1 /usr/bin/yes Up
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
3b256d98bf2c python:3.5.2 "/usr/bin/yes" 7 seconds ago Up 6 seconds dockerplayground_another_1
dfc04a452547 python:3.5.2 "/usr/bin/yes" 7 seconds ago Up 6 seconds dockerplayground_main_1
$ docker exec -it 3b256d98bf2c ping dfc04a452547
ping: unknown host
$ docker exec -it 3b256d98bf2c ping main
ping: unknown host
$ docker exec -it 3b256d98bf2c ping another
ping: unknown host
$ docker exec -it 3b256d98bf2c ping dockerplayground_another_1
ping: unknown host
$ docker exec -it 3b256d98bf2c ping dockerplayground_main_1
ping: unknown host
If I search up the ip address of the containers through docker network inspect bridge
, I can use that to ping as follows. 如果我通过
docker network inspect bridge
搜索容器的ip地址,我可以使用它来ping如下。
$ docker exec -it 3b256d98bf2c ping 172.17.0.2
PING 172.17.0.2 (172.17.0.2): 56 data bytes
64 bytes from 172.17.0.2: icmp_seq=0 ttl=64 time=0.076 ms
64 bytes from 172.17.0.2: icmp_seq=1 ttl=64 time=0.077 ms
64 bytes from 172.17.0.2: icmp_seq=2 ttl=64 time=0.046 ms
However, I want to do the same thing through the hostname of the containers. 但是,我想通过容器的主机名做同样的事情。 My docker, docker-compose, and OS versions are as follows.
我的docker,docker-compose和OS版本如下。
$ docker --version
Docker version 17.12.0-ce, build c97c6d6
$ docker-compose --version
docker-compose version 1.18.0, build 8dd22a9
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.3 LTS
Release: 16.04
Codename: xenial
Credits to tgogos: I just had to use the non-default bridge. 致tgogos:我只需要使用非默认桥。
For completeness, here is my working config. 为了完整性,这是我的工作配置。
version: "3"
services:
main:
networks:
test:
image: python:3.5.2
entrypoint: /usr/bin/yes
another:
networks:
test:
image: python:3.5.2
entrypoint: /usr/bin/yes
networks:
test:
driver: bridge
And the ping now works. ping现在可以了。
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
faa9f96d46a9 python:3.5.2 "/usr/bin/yes" 9 seconds ago Up 9 seconds dockerplayground_main_1
5b2d56ac0cd7 python:3.5.2 "/usr/bin/yes" 9 seconds ago Up 8 seconds dockerplayground_another_1
$ docker exec -it faa ping another
PING another (172.18.0.2): 56 data bytes
64 bytes from 172.18.0.2: icmp_seq=0 ttl=64 time=0.054 ms
64 bytes from 172.18.0.2: icmp_seq=1 ttl=64 time=0.047 ms
64 bytes from 172.18.0.2: icmp_seq=2 ttl=64 time=0.059 ms
64 bytes from 172.18.0.2: icmp_seq=3 ttl=64 time=0.066 ms
从你的撰写文件中删除这个network_mode: bridge
,为我工作=)。
Another solution I tried and worked was explicitly linking the containing you want to ping with host name. 我尝试和工作的另一个解决方案是显式链接您要ping的主机名。 For example, I have a
postgres
container, and a server
wants to connect to it. 例如,我有一个
postgres
容器, server
想要连接到它。
Run the server
with the following 使用以下命令运行
server
docker run --name server --link postgres someserver:latest
In the server container environment, you can then ping with (given postgres
is on the same bridge/network and is running) 在服务器容器环境中,您可以ping(给定的
postgres
在同一个网桥/网络上运行)
ping postgres
Since --link
has been deprecated, it is recommended to use network bridge. 由于
--link
已被弃用,因此建议使用网桥。
docker network create YOURNETWORK
docker run --name postgres --network='YOURNETWORK' postgres:latest
docker run --name server --network='YOURNETWORK' server:latest
then the two containers can ping each other by name. 然后两个容器可以通过名称相互ping通。
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