错误:未能构建服务'web‘：命令'/bin/sh -c apk add --no-cache gcc musl-dev linux-headers’返回非零代码:3

Question

我只是遵循docker-compose官方文档的演示。

虚拟机: VMware工作站15播放器操作系统: Centos7

docker-compose.yml

version: '3'
 services:
   web:
       build: .
       ports:
        - "5000:5000"
   redis:
       image: "redis:alpine"

Dockerfile：

ROM python:3.7-alpine
WORKDIR /code
ENV FLASK_APP app.py
ENV FLASK_RUN_HOST 0.0.0.0
RUN apk add --no-cache gcc musl-dev linux-headers
COPY requirements.txt requirements.txt
RUN pip install -r requirements.txt
COPY . .
CMD ["flask", "run"]

运行commend：

docker-compose up

日志和错误消息

Building web
Step 1/9 : FROM python:3.7-alpine
 ---> 7fbc871584eb
Step 2/9 : WORKDIR /code
 ---> Using cache
 ---> c20780a4b2d4
Step 3/9 : ENV FLASK_APP app.py
 ---> Using cache
 ---> 973cc407ca91
Step 4/9 : ENV FLASK_RUN_HOST 0.0.0.0
 ---> Using cache
 ---> 23891144700d
Step 5/9 : RUN apk add --no-cache gcc musl-dev linux-headers
 ---> [Warning] IPv4 forwarding is disabled. Networking will not work.
 ---> Running in 7b29f4df9539
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
WARNING: Ignoring http://dl-cdn.alpinelinux.org/alpine/v3.11/main/x86_64/APKINDEX.tar.gz: temporary error (try again later)
WARNING: Ignoring http://dl-cdn.alpinelinux.org/alpine/v3.11/community/x86_64/APKINDEX.tar.gz: temporary error (try again later)
ERROR: unsatisfiable constraints:
  gcc (missing):
    required by: world[gcc]
  linux-headers (missing):
    required by: world[linux-headers]
  musl-dev (missing):
    required by: world[musl-dev]
ERROR: Service 'web' failed to build: The command '/bin/sh -c apk add --no-cache gcc musl-dev linux-headers' returned a non-zero code: 3

有谁能帮帮我呢？

Answer 1

出现这个错误的根本原因是docker镜像上没有安装(安装失败) GCC。确保您有internet连接才能安装这些库。

从你收到的警告中

---> [Warning] IPv4 forwarding is disabled. Networking will not work.

Docker容器似乎没有互联网连接，您必须使用以下命令启用IPv4 forwarding

echo 1 > /proc/sys/net/ipv4/ip_forward
sysctl -w net.ipv4.ip_forward=1
sysctl -p /etc/sysctl.conf

欲了解更多信息，请访问here。

Answer 2

我在fedora上部分地使用博客解决了这个问题，博客来自：https://fedoramagazine.org/docker-and-fedora-32/

启用旧CGroups：

sudo grubby --update-kernel=ALL --args="systemd.unified_cgroup_hierarchy=0"

防火墙中的白名单docker：

sudo firewall-cmd --permanent --zone=trusted --add-interface=docker0
sudo firewall-cmd --permanent --zone=FedoraWorkstation --add-masquerade

为docket-composer安装依赖项：

sudo dnf install python3-attrs python3-bcrypt python3-cached_property python3-docker python3-docker-pycreds python3-dockerpty python3-docopt python3-fluidity-sm python3-invoke python3-jsonschema python3-lexicon python3-paramiko python3-pyasn1 python3-pynacl python3-pyrsistent python3-texttable python3-websocket-client

sudo reboot