启动docker警告 WARNING: IPv4 forwarding is disabled. Networking will not work

在启动docker的时候提示警告 WARNING: IPv4 forwarding is disabled. Networking will not work.

[[e-mail] ~]# docker run -it --name docano -p 8000:8000 doccano/doccano:latest
WARNING: IPv4 forwarding is disabled. Networking will not work

解决方案如下：

修改配置文件：

vim /usr/lib/sysctl.d/00-system.conf

追加保存并退出

 net.ipv4.ip_forward=1

接着重启网络

[[e-mail] ~]# systemctl restart network

然后将之前错误的docker删掉，重新创建启动即可

[[e-mail] ~]# docker run -it --name docano -p 8000:8000 doccano/doccano:latest
docker: Error response from daemon: Conflict. The container name "/docano" is already in use by container "34fce6bd5ac6dc38763c99a5e401c0732b48ee9a6c9b61c7226cda5c1d7600f7". You have to remove (or rename) that container to be able to reuse that name.
See 'docker run --help'.
[[e-mail] ~]# docker rm 34fce6bd5ac6dc38763c99a5e401c0732b48ee9a6c9b61c7226cda5c1d7600f7
[[e-mail] ~]# docker run -it --name docano -p 8000:8000 doccano/doccano:latest