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docker - 在 docker 容器内运行的主机命令无法解析容器主机名，但 ping 可以

问题描述

我在 docker 容器外壳中运行以下命令[root@quickstart /]

然而，host quickstart回报 Host quickstart not found: 3(NXDOMAIN)

并 [root@quickstart /]# host quickstart.cloudera返回

Host quickstart.cloudera not found: 3(NXDOMAIN)

返回

PING quickstart.cloudera (172.17.0.3) 56(84) bytes of data.

--- quickstart.cloudera ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.053/0.053/0.053/0.000 ms

容器开始使用docker run --name my_cloudera --hostname=quickstart.cloudera --privileged=true -td -p 8888:8888 -p 7180:7180 -p 6680:80 -v ~/cloudera_data/lib:/var/lib my_cloudera /usr/bin/docker-quickstart

容器/etc/hosts显示：

[root@quickstart /]# 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 172.17.0.3 quickstart.cloudera quickstart

docker 守护进程在 MacOS 上运行

如何导致host解析quickstart.cloudera容器主机名？

标签： dockerdnspinghostnamedocker-networking

解决方案

在启动容器时，--hostname在docker run命令中添加标志，您将能够看到它。看看下面的例子： -

$ docker run -it --hostname test alpine /bin/sh

/ # apk update
fetch http://dl-cdn.alpinelinux.org/alpine/v3.11/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.11/community/x86_64/APKINDEX.tar.gz
v3.11.6-71-gb45d3b45cc [http://dl-cdn.alpinelinux.org/alpine/v3.11/main]
v3.11.6-68-gf6abc2afac [http://dl-cdn.alpinelinux.org/alpine/v3.11/community]
OK: 11276 distinct packages available
/ # apk add bind-tools
(1/16) Installing fstrm (0.6.0-r1)
(2/16) Installing libgcc (9.2.0-r4)
(3/16) Installing krb5-conf (1.0-r1)
(4/16) Installing libcom_err (1.45.5-r0)
(5/16) Installing keyutils-libs (1.6.1-r0)
(6/16) Installing libverto (0.3.1-r1)
(7/16) Installing krb5-libs (1.17.1-r0)
(8/16) Installing json-c (0.13.1-r1)
(9/16) Installing libstdc++ (9.2.0-r4)
(10/16) Installing libprotobuf (3.11.2-r1)
(11/16) Installing libprotoc (3.11.2-r1)
(12/16) Installing protobuf-c (1.3.2-r3)
(13/16) Installing xz-libs (5.2.4-r0)
(14/16) Installing libxml2 (2.9.10-r3)
(15/16) Installing bind-libs (9.14.12-r0)
(16/16) Installing bind-tools (9.14.12-r0)
Executing busybox-1.31.1-r9.trigger
OK: 18 MiB in 30 packages
/ # hostname
test

/ #  host -v test
Trying "test"
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 49171
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;test.              IN  A

;; ANSWER SECTION:
test.           15  IN  A   127.0.0.1

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