docker：IPv4 forwarding is disabled. Networking will not work. 解决方法

参考文档：
https://blog.csdn.net/yelllowcong/article/details/78295600

1.当你使用docker容器的时候有可能出现以下情况：IPv4转发已禁用。网络是行不通的。是因为IPv4转发被禁用了，只需要开启就可以了。

2.开启转发配置

vim /etc/sysctl.conf#配置转发
net.ipv4.ip_forward=1
#保存退出就可以了
:wq!
#重启服务，让配置生效
systemctl restart network#查看是否成功,如果返回为“net.ipv4.ip_forward = 1”则表示成功sysctl net.ipv4.ip_forward

然后看一下是否配置成功，看到这句话就是配置成功了。

只需要在检查一下是否成功

#重启docker
sudo systemctl start docker
#查看运行过的容器
sudo docker ps -a
#开启mysql容器开机启动
sudo docker update mysql --restart=always

没有异常就是成功了。

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